diff --git a/apps/sim/lib/auth/auth.ts b/apps/sim/lib/auth/auth.ts
index a4aeafc2343..d5cdc948345 100644
--- a/apps/sim/lib/auth/auth.ts
+++ b/apps/sim/lib/auth/auth.ts
@@ -8,9 +8,9 @@ import * as schema from '@sim/db/schema'
 import { createLogger } from '@sim/logger'
 import { toError } from '@sim/utils/errors'
 import { generateId } from '@sim/utils/id'
-import { betterAuth, type User } from 'better-auth'
+import { type BetterAuthOptions, betterAuth, type User } from 'better-auth'
 import { drizzleAdapter } from 'better-auth/adapters/drizzle'
-import { APIError, createAuthMiddleware } from 'better-auth/api'
+import { APIError, createAuthMiddleware, getSessionFromCtx } from 'better-auth/api'
 import { nextCookies } from 'better-auth/next-js'
 import {
   admin,
@@ -34,8 +34,13 @@ import {
 import { getAccessControlConfig, isEmailBlockedByAccessControl } from '@/lib/auth/access-control'
 import { createAnonymousSession, ensureAnonymousUserExists } from '@/lib/auth/anonymous'
 import { getRequestedSignInProviderId, isSignInProviderAllowed } from '@/lib/auth/constants'
+import { guardSubscriptionPlanWrites } from '@/lib/auth/stripe-adapter-guard'
 import { sendPlanWelcomeEmail } from '@/lib/billing'
-import { authorizeSubscriptionReference } from '@/lib/billing/authorization'
+import {
+  assertPersonalCheckoutAllowed,
+  authorizeSubscriptionReference,
+  isPersonalCheckoutRequest,
+} from '@/lib/billing/authorization'
 import {
   getOrganizationIdForSubscriptionReference,
   syncSubscriptionPlan,
@@ -46,7 +51,8 @@ import {
   ensureOrganizationForTeamSubscription,
   syncSubscriptionUsageLimits,
 } from '@/lib/billing/organization'
-import { isTeam } from '@/lib/billing/plan-helpers'
+import { pauseProSubscriptionForOrgCoverage } from '@/lib/billing/organizations/membership'
+import { isPro, isTeam } from '@/lib/billing/plan-helpers'
 import { getPlans, resolvePlanFromStripeSubscription } from '@/lib/billing/plans'
 import { syncSeatsFromStripeQuantity } from '@/lib/billing/validation/seat-management'
 import { handleAbandonedCheckout } from '@/lib/billing/webhooks/checkout'
@@ -58,7 +64,6 @@ import {
   handleInvoicePaymentSucceeded,
 } from '@/lib/billing/webhooks/invoices'
 import {
-  handleOrganizationPlanDowngrade,
   handleSubscriptionCreated,
   handleSubscriptionDeleted,
 } from '@/lib/billing/webhooks/subscription'
@@ -193,10 +198,13 @@ export const auth = betterAuth({
     ...(env.NEXT_PUBLIC_SOCKET_URL ? [env.NEXT_PUBLIC_SOCKET_URL] : []),
     ...additionalTrustedOrigins,
   ].filter(Boolean),
-  database: drizzleAdapter(db, {
-    provider: 'pg',
-    schema,
-  }),
+  database: (options: BetterAuthOptions) =>
+    guardSubscriptionPlanWrites(
+      drizzleAdapter(db, {
+        provider: 'pg',
+        schema,
+      })(options)
+    ),
   session: {
     cookieCache: {
       enabled: true,
@@ -903,6 +911,21 @@ export const auth = betterAuth({
         }
       }
 
+      /**
+       * Personal checkout guard. The Stripe plugin's `authorizeReference`
+       * only runs for organization references (it skips references equal to
+       * the session user), so duplicate-coverage enforcement for personal
+       * checkouts lives here: a member of an org with an entitled paid
+       * subscription must not buy a personal plan on top of it.
+       */
+      if (isBillingEnabled && ctx.path === '/subscription/upgrade') {
+        const session = await getSessionFromCtx(ctx)
+        const sessionUserId = session?.user?.id
+        if (sessionUserId && isPersonalCheckoutRequest(ctx.body ?? {}, sessionUserId)) {
+          await assertPersonalCheckoutAllowed(sessionUserId)
+        }
+      }
+
       return
     }),
   },
@@ -3140,8 +3163,21 @@ export const auth = betterAuth({
             subscription: {
               enabled: true,
               plans: getPlans(),
-              authorizeReference: async ({ user, referenceId, action }) => {
-                return await authorizeSubscriptionReference(user.id, referenceId, action)
+              authorizeReference: async ({ user, referenceId, action }, ctx) => {
+                const body: unknown = ctx?.body
+                const requestedPlan =
+                  typeof body === 'object' &&
+                  body !== null &&
+                  'plan' in body &&
+                  typeof body.plan === 'string'
+                    ? body.plan
+                    : undefined
+                return await authorizeSubscriptionReference(
+                  user.id,
+                  referenceId,
+                  action,
+                  requestedPlan
+                )
               },
               getCheckoutSessionParams: async () => ({
                 params: { allow_promotion_codes: true },
@@ -3175,11 +3211,16 @@ export const auth = betterAuth({
                   )
                 }
 
-                await syncSubscriptionPlan(subscription.id, subscription.plan, planFromStripe)
+                const syncedPlan = await syncSubscriptionPlan(
+                  subscription.id,
+                  subscription.plan,
+                  planFromStripe,
+                  subscription.referenceId
+                )
 
                 const subscriptionForOrg = {
                   ...subscription,
-                  plan: planFromStripe ?? subscription.plan,
+                  plan: syncedPlan ?? subscription.plan,
                   enterpriseOperationId: stripeSubscription.metadata?.enterpriseOperationId ?? null,
                 }
 
@@ -3202,7 +3243,29 @@ export const auth = betterAuth({
                   throw orgError
                 }
 
-                await handleSubscriptionCreated(resolvedSubscription, event.id)
+                /**
+                 * Transactional fence behind the personal-checkout admission
+                 * guard: if the user joined a paid organization while their
+                 * checkout was in flight, pause the fresh personal Pro at
+                 * period end (same state a paid-org joiner's personal Pro
+                 * enters; restored automatically if they leave the org).
+                 *
+                 * Runs BEFORE the free→paid transition handling: a personal
+                 * subscription born covered is not a free→paid transition —
+                 * the org plan keeps governing the user — so the usage reset
+                 * (which would wipe org-attributed current-period usage) and
+                 * its instrumentation must not run. Gated on `covered`, not
+                 * `paused`, so event retries decide identically even when the
+                 * join path already paused the subscription.
+                 */
+                const coveredByOrganization = isPro(resolvedSubscription.plan)
+                  ? (await pauseProSubscriptionForOrgCoverage(resolvedSubscription.referenceId))
+                      .covered
+                  : false
+
+                if (!coveredByOrganization) {
+                  await handleSubscriptionCreated(resolvedSubscription, event.id)
+                }
 
                 await syncSubscriptionUsageLimits(resolvedSubscription)
 
@@ -3238,8 +3301,6 @@ export const auth = betterAuth({
                 const isUpgradeToTeam =
                   isTeamPlan && !isTeam(subscription.plan) && referenceOrganizationId == null
 
-                const effectivePlanForTeamFeatures = planFromStripe ?? subscription.plan
-
                 logger.info('[onSubscriptionUpdate] Subscription updated', {
                   subscriptionId: subscription.id,
                   status: subscription.status,
@@ -3258,11 +3319,24 @@ export const auth = betterAuth({
                   )
                 }
 
-                await syncSubscriptionPlan(subscription.id, subscription.plan, planFromStripe)
+                const syncedPlan = await syncSubscriptionPlan(
+                  subscription.id,
+                  subscription.plan,
+                  planFromStripe,
+                  subscription.referenceId
+                )
+
+                /**
+                 * All downstream processing keys off the plan the DB actually
+                 * holds after the sync — a plan write refused by the org/plan
+                 * invariant must not leak the rejected Stripe plan into org
+                 * resolution, seat sync, or usage limits.
+                 */
+                const effectivePlanForTeamFeatures = syncedPlan ?? subscription.plan
 
                 const subscriptionForOrg = {
                   ...subscription,
-                  plan: planFromStripe ?? subscription.plan,
+                  plan: effectivePlanForTeamFeatures,
                   enterpriseOperationId: stripeSubscription.metadata?.enterpriseOperationId ?? null,
                 }
 
@@ -3333,16 +3407,6 @@ export const auth = betterAuth({
                       error,
                     })
                   }
-                } else {
-                  await handleOrganizationPlanDowngrade(
-                    {
-                      id: resolvedSubscription.id,
-                      plan: effectivePlanForTeamFeatures ?? null,
-                      referenceId: resolvedSubscription.referenceId,
-                      status: resolvedSubscription.status ?? null,
-                    },
-                    event.id
-                  )
                 }
 
                 await writeBillingInterval(resolvedSubscription.id, isAnnual ? 'year' : 'month')
diff --git a/apps/sim/lib/auth/stripe-adapter-guard.test.ts b/apps/sim/lib/auth/stripe-adapter-guard.test.ts
new file mode 100644
index 00000000000..8c8521041ee
--- /dev/null
+++ b/apps/sim/lib/auth/stripe-adapter-guard.test.ts
@@ -0,0 +1,177 @@
+/**
+ * @vitest-environment node
+ */
+import { dbChainMock, dbChainMockFns, resetDbChainMock } from '@sim/testing'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+vi.mock('@sim/db', () => dbChainMock)
+
+import { guardSubscriptionPlanWrites } from '@/lib/auth/stripe-adapter-guard'
+
+function createBaseAdapter() {
+  return {
+    create: vi.fn(async (data: { data: unknown }) => data.data),
+    update: vi.fn(async (data: { update: unknown }) => data.update),
+    updateMany: vi.fn(async () => 1),
+    findOne: vi.fn(),
+  }
+}
+
+/**
+ * The guard only relies on create/update/updateMany/findOne; the remaining
+ * adapter surface passes through the spread untouched.
+ */
+// double-cast-allowed: test double implements only the adapter subset the guard touches
+const asAdapter = (base: ReturnType<typeof createBaseAdapter>) =>
+  guardSubscriptionPlanWrites(base as unknown as Parameters<typeof guardSubscriptionPlanWrites>[0])
+
+const ORG_ROW = { id: 'sub-1', referenceId: 'org-1', plan: 'team_6000' }
+const WHERE = [{ field: 'id', value: 'sub-1' }]
+
+describe('guardSubscriptionPlanWrites', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    resetDbChainMock()
+  })
+
+  it('strips a non-org plan from an update targeting an org-referenced row but keeps the rest', async () => {
+    const base = createBaseAdapter()
+    base.findOne.mockResolvedValueOnce(ORG_ROW)
+    // org existence lookup
+    dbChainMockFns.limit.mockResolvedValueOnce([{ id: 'org-1' }])
+
+    const guarded = asAdapter(base)
+    await guarded.update({
+      model: 'subscription',
+      where: WHERE as never,
+      update: { plan: 'pro_6000', status: 'active', seats: 2 },
+    })
+
+    expect(base.update).toHaveBeenCalledWith(
+      expect.objectContaining({ update: { status: 'active', seats: 2 } })
+    )
+  })
+
+  it('returns the current row without writing when stripping leaves an empty update', async () => {
+    const base = createBaseAdapter()
+    base.findOne.mockResolvedValueOnce(ORG_ROW).mockResolvedValueOnce(ORG_ROW)
+    dbChainMockFns.limit.mockResolvedValueOnce([{ id: 'org-1' }])
+
+    const guarded = asAdapter(base)
+    const result = await guarded.update({
+      model: 'subscription',
+      where: WHERE as never,
+      update: { plan: 'pro_6000' },
+    })
+
+    expect(result).toEqual(ORG_ROW)
+    expect(base.update).not.toHaveBeenCalled()
+  })
+
+  it('strips the plan when the pre-update lookup finds no row (fail closed)', async () => {
+    const base = createBaseAdapter()
+    base.findOne.mockResolvedValueOnce(null)
+
+    const guarded = asAdapter(base)
+    await guarded.update({
+      model: 'subscription',
+      where: WHERE as never,
+      update: { plan: 'pro_6000', status: 'active' },
+    })
+
+    expect(base.update).toHaveBeenCalledWith(
+      expect.objectContaining({ update: { status: 'active' } })
+    )
+  })
+
+  it('writes nothing when a plan-only update targets no readable row', async () => {
+    const base = createBaseAdapter()
+    base.findOne.mockResolvedValueOnce(null)
+
+    const guarded = asAdapter(base)
+    const result = await guarded.update({
+      model: 'subscription',
+      where: WHERE as never,
+      update: { plan: 'pro_6000' },
+    })
+
+    expect(result).toBeNull()
+    expect(base.update).not.toHaveBeenCalled()
+  })
+
+  it('passes through non-org plan updates for user-referenced rows', async () => {
+    const base = createBaseAdapter()
+    base.findOne.mockResolvedValueOnce({ id: 'sub-2', referenceId: 'user-1', plan: 'pro_6000' })
+    // org existence lookup: user id is not an organization
+    dbChainMockFns.limit.mockResolvedValueOnce([])
+
+    const guarded = asAdapter(base)
+    await guarded.update({
+      model: 'subscription',
+      where: WHERE as never,
+      update: { plan: 'pro_25000', status: 'active' },
+    })
+
+    expect(base.update).toHaveBeenCalledWith(
+      expect.objectContaining({ update: { plan: 'pro_25000', status: 'active' } })
+    )
+  })
+
+  it('passes through org-plan updates without any row lookup', async () => {
+    const base = createBaseAdapter()
+
+    const guarded = asAdapter(base)
+    await guarded.update({
+      model: 'subscription',
+      where: WHERE as never,
+      update: { plan: 'team_25000', seats: 5 },
+    })
+
+    expect(base.findOne).not.toHaveBeenCalled()
+    expect(base.update).toHaveBeenCalledWith(
+      expect.objectContaining({ update: { plan: 'team_25000', seats: 5 } })
+    )
+  })
+
+  it('passes through updates on other models untouched', async () => {
+    const base = createBaseAdapter()
+
+    const guarded = asAdapter(base)
+    await guarded.update({
+      model: 'user',
+      where: WHERE as never,
+      update: { plan: 'pro_6000' },
+    })
+
+    expect(base.findOne).not.toHaveBeenCalled()
+    expect(base.update).toHaveBeenCalled()
+  })
+
+  it('rejects creating an org-referenced subscription with a non-org plan', async () => {
+    const base = createBaseAdapter()
+    dbChainMockFns.limit.mockResolvedValueOnce([{ id: 'org-1' }])
+
+    const guarded = asAdapter(base)
+    await expect(
+      guarded.create({
+        model: 'subscription',
+        data: { plan: 'pro_6000', referenceId: 'org-1' } as never,
+      })
+    ).rejects.toThrow(/must hold a Team or Enterprise plan/)
+
+    expect(base.create).not.toHaveBeenCalled()
+  })
+
+  it('allows creating a personal pro subscription', async () => {
+    const base = createBaseAdapter()
+    dbChainMockFns.limit.mockResolvedValueOnce([])
+
+    const guarded = asAdapter(base)
+    await guarded.create({
+      model: 'subscription',
+      data: { plan: 'pro_6000', referenceId: 'user-1' } as never,
+    })
+
+    expect(base.create).toHaveBeenCalled()
+  })
+})
diff --git a/apps/sim/lib/auth/stripe-adapter-guard.ts b/apps/sim/lib/auth/stripe-adapter-guard.ts
new file mode 100644
index 00000000000..194af9cd6f3
--- /dev/null
+++ b/apps/sim/lib/auth/stripe-adapter-guard.ts
@@ -0,0 +1,185 @@
+import { db } from '@sim/db'
+import { organization } from '@sim/db/schema'
+import { createLogger } from '@sim/logger'
+import type { drizzleAdapter } from 'better-auth/adapters/drizzle'
+import { eq } from 'drizzle-orm'
+import { isOrgPlan } from '@/lib/billing/plan-helpers'
+
+const logger = createLogger('StripeAdapterGuard')
+
+type BetterAuthAdapter = ReturnType<ReturnType<typeof drizzleAdapter>>
+
+type SubscriptionWriteSurface = Pick<
+  BetterAuthAdapter,
+  'create' | 'update' | 'updateMany' | 'findOne' | 'findMany'
+>
+
+/**
+ * The Better Auth Stripe plugin persists webhook state through the raw
+ * database adapter BEFORE invoking our subscription callbacks — including the
+ * `plan` column resolved from the Stripe price. That makes the adapter the
+ * only in-process seam that can enforce the billing invariant that
+ * organization-referenced subscriptions hold Team/Enterprise plans: by the
+ * time `syncSubscriptionPlan` runs in a callback, the plugin's write has
+ * already landed.
+ *
+ * Checkout admission blocks user-driven violations; this guard blocks the
+ * remaining vector — an operator swapping an org subscription onto a personal
+ * price in the Stripe dashboard. It never repairs state: an invalid `plan`
+ * write is refused (update: the field is stripped so status/period/seat sync
+ * still lands; create: the whole insert is rejected) and an error is logged
+ * so operators fix the price in Stripe.
+ *
+ * Transactions are wrapped recursively so writes inside
+ * `adapter.transaction(...)` callbacks go through the same guard.
+ */
+export function guardSubscriptionPlanWrites(adapter: BetterAuthAdapter): BetterAuthAdapter {
+  const guarded: BetterAuthAdapter = {
+    ...adapter,
+    ...guardWriteSurface(adapter),
+  }
+
+  const transaction = adapter.transaction
+  if (typeof transaction === 'function') {
+    guarded.transaction = (callback) =>
+      transaction((trx) => callback({ ...trx, ...guardWriteSurface(trx) }))
+  }
+
+  return guarded
+}
+
+function guardWriteSurface<TAdapter extends SubscriptionWriteSurface>(
+  adapter: TAdapter
+): SubscriptionWriteSurface {
+  return {
+    findOne: adapter.findOne,
+    findMany: adapter.findMany,
+    create: async (data) => {
+      if (data.model === 'subscription') {
+        const values = data.data as Record<string, unknown>
+        const plan = values.plan
+        const referenceId = values.referenceId
+        if (
+          typeof plan === 'string' &&
+          !isOrgPlan(plan) &&
+          typeof referenceId === 'string' &&
+          (await isOrganizationReference(referenceId))
+        ) {
+          logger.error(
+            'Blocked creating an organization-referenced subscription with a non-org plan — fix the plan or reference in Stripe',
+            { referenceId, rejectedPlan: plan }
+          )
+          throw new Error(
+            `Organization-referenced subscriptions must hold a Team or Enterprise plan (got '${plan}')`
+          )
+        }
+      }
+      return adapter.create(data)
+    },
+    update: async (data) => {
+      if (data.model === 'subscription' && hasNonOrgPlanWrite(data.update)) {
+        const row = await adapter.findOne<SubscriptionRowSlice>({
+          model: 'subscription',
+          where: data.where,
+        })
+        const sanitized = await stripPlanWhenOrgReferenced(
+          row ? [row] : [],
+          data.update as Record<string, unknown>
+        )
+        if (sanitized.blockedAll) return row as never
+        return adapter.update({ ...data, update: sanitized.update as never })
+      }
+      return adapter.update(data)
+    },
+    updateMany: async (data) => {
+      if (data.model === 'subscription' && hasNonOrgPlanWrite(data.update)) {
+        const rows = await adapter.findMany<SubscriptionRowSlice>({
+          model: 'subscription',
+          where: data.where,
+        })
+        const sanitized = await stripPlanWhenOrgReferenced(rows, data.update)
+        if (sanitized.blockedAll) return 0
+        return adapter.updateMany({ ...data, update: sanitized.update })
+      }
+      return adapter.updateMany(data)
+    },
+  }
+}
+
+interface SubscriptionRowSlice {
+  id: string
+  referenceId: string
+  plan: string
+}
+
+function hasNonOrgPlanWrite(update: unknown): boolean {
+  if (!update || typeof update !== 'object' || !('plan' in update)) return false
+  const plan = (update as { plan: unknown }).plan
+  return typeof plan === 'string' && !isOrgPlan(plan)
+}
+
+async function isOrganizationReference(referenceId: string): Promise<boolean> {
+  const [referencedOrganization] = await db
+    .select({ id: organization.id })
+    .from(organization)
+    .where(eq(organization.id, referenceId))
+    .limit(1)
+  return Boolean(referencedOrganization)
+}
+
+interface SanitizedSubscriptionUpdate {
+  update: Record<string, unknown>
+  /** True when stripping the invalid plan left nothing to write. */
+  blockedAll: boolean
+}
+
+/**
+ * Strip a non-org `plan` (and its derived `limits`) from an update when ANY
+ * targeted row is organization-referenced. The remaining fields (status,
+ * periods, seats, cancellation state) are legitimate Stripe state and still
+ * sync. Evaluating every targeted row keeps multi-row updates safe: a mixed
+ * personal/org target set must not leak the invalid plan onto the org rows.
+ *
+ * Fails closed on an empty target set: a plan we could not verify against a
+ * readable row never forwards — the row may be mid-creation by a concurrent
+ * webhook delivery, and in the sequential no-row case the write was a no-op
+ * anyway. A legitimate user-referenced plan dropped this way re-syncs via
+ * `syncSubscriptionPlan` in the same webhook callback.
+ */
+async function stripPlanWhenOrgReferenced(
+  rows: SubscriptionRowSlice[],
+  update: Record<string, unknown>
+): Promise<SanitizedSubscriptionUpdate> {
+  if (rows.length === 0) {
+    logger.warn(
+      'Subscription plan write targeted no readable row; stripping the unverifiable plan',
+      { rejectedPlan: update.plan }
+    )
+    const { plan: _plan, limits: _limits, ...rest } = update
+    return { update: rest, blockedAll: Object.keys(rest).length === 0 }
+  }
+
+  let organizationRow: SubscriptionRowSlice | null = null
+  for (const row of rows) {
+    if (await isOrganizationReference(row.referenceId)) {
+      organizationRow = row
+      break
+    }
+  }
+  if (!organizationRow) {
+    return { update, blockedAll: false }
+  }
+
+  logger.error(
+    'Blocked writing a non-org plan onto an organization-referenced subscription — fix the price in Stripe',
+    {
+      subscriptionId: organizationRow.id,
+      organizationId: organizationRow.referenceId,
+      currentPlan: organizationRow.plan,
+      rejectedPlan: update.plan,
+    }
+  )
+
+  const { plan: _plan, limits: _limits, ...rest } = update
+  return { update: rest, blockedAll: Object.keys(rest).length === 0 }
+}
diff --git a/apps/sim/lib/billing/authorization.test.ts b/apps/sim/lib/billing/authorization.test.ts
index 6025302fdb8..002bb2a4537 100644
--- a/apps/sim/lib/billing/authorization.test.ts
+++ b/apps/sim/lib/billing/authorization.test.ts
@@ -3,10 +3,16 @@
  */
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-const { mockHasPaidSubscription, mockIsOwnerOrAdmin, mockAssertNoUnresolved } = vi.hoisted(() => ({
+const {
+  mockHasPaidSubscription,
+  mockIsOwnerOrAdmin,
+  mockAssertNoUnresolved,
+  mockGetOrganizationCoverageForMember,
+} = vi.hoisted(() => ({
   mockHasPaidSubscription: vi.fn(),
   mockIsOwnerOrAdmin: vi.fn(),
   mockAssertNoUnresolved: vi.fn(),
+  mockGetOrganizationCoverageForMember: vi.fn(),
 }))
 
 vi.mock('@sim/db', () => ({ db: {} }))
@@ -14,6 +20,9 @@ vi.mock('@/lib/billing', () => ({ hasPaidSubscription: mockHasPaidSubscription }
 vi.mock('@/lib/billing/core/organization', () => ({
   isOrganizationOwnerOrAdmin: mockIsOwnerOrAdmin,
 }))
+vi.mock('@/lib/billing/core/subscription', () => ({
+  getOrganizationCoverageForMember: mockGetOrganizationCoverageForMember,
+}))
 vi.mock('@/lib/billing/subscriptions/utils', () => ({
   isOrgScopedSubscription: ({ referenceId }: { referenceId: string }, userId: string) =>
     referenceId !== userId,
@@ -26,32 +35,127 @@ vi.mock('@/lib/billing/enterprise-outbox', () => {
   }
 })
 
-import { authorizeSubscriptionReference } from '@/lib/billing/authorization'
+import {
+  assertPersonalCheckoutAllowed,
+  authorizeSubscriptionReference,
+  isPersonalCheckoutRequest,
+} from '@/lib/billing/authorization'
 import { EnterpriseIssuanceInProgressError } from '@/lib/billing/enterprise-outbox'
 
+describe('isPersonalCheckoutRequest', () => {
+  it('classifies an explicit self reference as personal regardless of customerType', () => {
+    expect(isPersonalCheckoutRequest({ referenceId: 'user-1' }, 'user-1')).toBe(true)
+    expect(
+      isPersonalCheckoutRequest({ referenceId: 'user-1', customerType: 'organization' }, 'user-1')
+    ).toBe(true)
+  })
+
+  it('classifies an explicit foreign reference as not personal', () => {
+    expect(isPersonalCheckoutRequest({ referenceId: 'org-1' }, 'user-1')).toBe(false)
+  })
+
+  it('defaults to personal without a reference unless customerType selects the organization', () => {
+    expect(isPersonalCheckoutRequest({}, 'user-1')).toBe(true)
+    expect(isPersonalCheckoutRequest({ customerType: 'user' }, 'user-1')).toBe(true)
+    expect(isPersonalCheckoutRequest({ customerType: 'organization' }, 'user-1')).toBe(false)
+  })
+})
+
 describe('authorizeSubscriptionReference', () => {
   beforeEach(() => {
     vi.clearAllMocks()
     mockHasPaidSubscription.mockResolvedValue(false)
     mockAssertNoUnresolved.mockResolvedValue(undefined)
     mockIsOwnerOrAdmin.mockResolvedValue(true)
+    mockGetOrganizationCoverageForMember.mockResolvedValue({ status: 'not-covered' })
   })
 
   it('blocks an organization checkout while Enterprise issuance is unresolved', async () => {
     mockAssertNoUnresolved.mockRejectedValueOnce(new EnterpriseIssuanceInProgressError())
 
     await expect(
-      authorizeSubscriptionReference('owner-1', 'org-1', 'upgrade-subscription')
-    ).resolves.toBe(false)
+      authorizeSubscriptionReference('owner-1', 'org-1', 'upgrade-subscription', 'team_6000')
+    ).rejects.toThrow(/Enterprise plan setup in progress/)
 
     expect(mockAssertNoUnresolved).toHaveBeenCalledWith(expect.anything(), 'org-1')
     expect(mockIsOwnerOrAdmin).not.toHaveBeenCalled()
   })
 
   it('allows an authorized organization checkout when no paid or reserved entitlement exists', async () => {
+    await expect(
+      authorizeSubscriptionReference('owner-1', 'org-1', 'upgrade-subscription', 'team_6000')
+    ).resolves.toBe(true)
+    expect(mockIsOwnerOrAdmin).toHaveBeenCalledWith('owner-1', 'org-1')
+  })
+
+  it('rejects an organization checkout for a pro plan — org references only hold Team/Enterprise', async () => {
+    await expect(
+      authorizeSubscriptionReference('owner-1', 'org-1', 'upgrade-subscription', 'pro_6000')
+    ).rejects.toThrow('Organizations can only subscribe to Team or Enterprise plans.')
+
+    expect(mockHasPaidSubscription).not.toHaveBeenCalled()
+    expect(mockIsOwnerOrAdmin).not.toHaveBeenCalled()
+  })
+
+  it('rejects an organization checkout when the plan cannot be determined (fail closed)', async () => {
     await expect(
       authorizeSubscriptionReference('owner-1', 'org-1', 'upgrade-subscription')
+    ).rejects.toThrow('Organizations can only subscribe to Team or Enterprise plans.')
+  })
+
+  it('blocks an organization checkout when the organization already has an active subscription', async () => {
+    mockHasPaidSubscription.mockResolvedValueOnce(true)
+
+    await expect(
+      authorizeSubscriptionReference('owner-1', 'org-1', 'upgrade-subscription', 'team_6000')
+    ).rejects.toThrow(/already has an active subscription/)
+  })
+
+  it('does not apply checkout-only rules to other billing actions', async () => {
+    await expect(
+      authorizeSubscriptionReference('owner-1', 'org-1', 'cancel-subscription')
     ).resolves.toBe(true)
+
+    expect(mockHasPaidSubscription).not.toHaveBeenCalled()
     expect(mockIsOwnerOrAdmin).toHaveBeenCalledWith('owner-1', 'org-1')
   })
+
+  it('allows personal references without invoking org checks', async () => {
+    await expect(
+      authorizeSubscriptionReference('user-1', 'user-1', 'upgrade-subscription', 'pro_6000')
+    ).resolves.toBe(true)
+
+    expect(mockGetOrganizationCoverageForMember).not.toHaveBeenCalled()
+    expect(mockIsOwnerOrAdmin).not.toHaveBeenCalled()
+  })
+})
+
+describe('assertPersonalCheckoutAllowed', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mockGetOrganizationCoverageForMember.mockResolvedValue({ status: 'not-covered' })
+  })
+
+  it('allows checkout when the user is not covered by any organization', async () => {
+    await expect(assertPersonalCheckoutAllowed('user-1')).resolves.toBeUndefined()
+  })
+
+  it('rejects checkout when an organization subscription already covers the user', async () => {
+    mockGetOrganizationCoverageForMember.mockResolvedValueOnce({
+      status: 'covered',
+      organizationId: 'org-1',
+    })
+
+    await expect(assertPersonalCheckoutAllowed('user-1')).rejects.toThrow(
+      /already covered by your organization/
+    )
+  })
+
+  it('rejects checkout when coverage cannot be verified (fail closed)', async () => {
+    mockGetOrganizationCoverageForMember.mockResolvedValueOnce({ status: 'unknown' })
+
+    await expect(assertPersonalCheckoutAllowed('user-1')).rejects.toThrow(
+      /could not verify your billing status/
+    )
+  })
 })
diff --git a/apps/sim/lib/billing/authorization.ts b/apps/sim/lib/billing/authorization.ts
index 8354f768f8e..68586a1ff69 100644
--- a/apps/sim/lib/billing/authorization.ts
+++ b/apps/sim/lib/billing/authorization.ts
@@ -1,42 +1,127 @@
 import { db } from '@sim/db'
 import { createLogger } from '@sim/logger'
+import { APIError } from 'better-auth/api'
 import { hasPaidSubscription } from '@/lib/billing'
 import { isOrganizationOwnerOrAdmin } from '@/lib/billing/core/organization'
+import { getOrganizationCoverageForMember } from '@/lib/billing/core/subscription'
 import {
   assertNoUnresolvedEnterpriseIssuance,
   EnterpriseIssuanceInProgressError,
 } from '@/lib/billing/enterprise-outbox'
+import { isOrgPlan } from '@/lib/billing/plan-helpers'
 import { isOrgScopedSubscription } from '@/lib/billing/subscriptions/utils'
 
 const logger = createLogger('BillingAuthorization')
 
+/**
+ * Classify a `/subscription/upgrade` request as a personal checkout using
+ * the same reference resolution as the Better Auth Stripe plugin
+ * (`@better-auth/stripe` 1.6.13): an explicit `referenceId` defines the
+ * reference (personal iff it is the session user); without one, the
+ * reference defaults to the user unless `customerType: 'organization'`
+ * selects the session's active organization.
+ *
+ * This mirror exists because the plugin does not expose its resolution and
+ * skips `authorizeReference` for personal references entirely. Re-verify
+ * against the plugin's `referenceMiddleware`/`getReferenceId` when
+ * upgrading better-auth.
+ */
+export function isPersonalCheckoutRequest(
+  body: { referenceId?: unknown; customerType?: unknown },
+  sessionUserId: string
+): boolean {
+  if (body.referenceId) return body.referenceId === sessionUserId
+  return body.customerType !== 'organization'
+}
+
+/**
+ * Guard for personal (user-referenced) checkouts on `/subscription/upgrade`.
+ *
+ * A member of an organization with an entitled paid subscription is already
+ * covered by that org — their usage pools to it and personal Pro
+ * subscriptions are paused on join — so a personal checkout would bill the
+ * same human twice. Throws {@link APIError} with a user-facing message; the
+ * checkout UI surfaces it as-is.
+ *
+ * Called from the Better Auth `hooks.before` middleware, NOT from
+ * `authorizeReference`: the Stripe plugin skips `authorizeReference`
+ * entirely when the reference is the session user, so this is the only
+ * enforcement point that personal checkouts actually pass through.
+ *
+ * Fails closed: when coverage cannot be determined, the checkout is
+ * rejected rather than risking a duplicate subscription.
+ */
+export async function assertPersonalCheckoutAllowed(userId: string): Promise<void> {
+  const coverage = await getOrganizationCoverageForMember(userId)
+
+  if (coverage.status === 'covered') {
+    logger.warn(
+      'Blocking personal checkout - user is already covered by an organization subscription',
+      { userId, organizationId: coverage.organizationId }
+    )
+    throw new APIError('FORBIDDEN', {
+      message:
+        "You're already covered by your organization's plan, so a personal plan would bill you twice. Manage your plan from the organization's billing settings.",
+    })
+  }
+
+  if (coverage.status === 'unknown') {
+    logger.error(
+      'Blocking personal checkout - could not verify organization coverage; failing closed',
+      { userId }
+    )
+    throw new APIError('SERVICE_UNAVAILABLE', {
+      message: 'We could not verify your billing status. Please try again in a moment.',
+    })
+  }
+}
+
 /**
  * Check if a user is authorized to manage billing for a given reference ID.
- * Reference ID can be either a user ID (personal subscription) or an
- * organization ID (org-scoped subscription — team, enterprise, or a
- * `pro_*` plan transferred to an org).
+ * Only invoked for organization references — the Stripe plugin skips this
+ * callback when the reference is the session user itself (personal
+ * checkouts are guarded by {@link assertPersonalCheckoutAllowed} in the
+ * `hooks.before` middleware instead).
  *
- * This function also performs duplicate subscription validation for
- * organizations:
- * - Rejects if an organization already has an active subscription (prevents
- *   duplicates).
- * - Personal subscriptions skip this check to allow upgrades.
+ * For `upgrade-subscription` (checkout) this enforces, each thrown as an
+ * {@link APIError} with a descriptive message so callers see the real
+ * reason instead of a generic "Unauthorized":
+ * - Organizations can only check out Team or Enterprise plans — a `pro_*`
+ *   plan can never become org-referenced.
+ * - Organizations cannot start a checkout while they already have an
+ *   active subscription (prevents duplicates).
+ * - Checkout is deferred while an Enterprise issuance is unresolved.
  */
 export async function authorizeSubscriptionReference(
   userId: string,
   referenceId: string,
-  action?: string
+  action?: string,
+  plan?: string
 ): Promise<boolean> {
   if (!isOrgScopedSubscription({ referenceId }, userId)) {
     return true
   }
 
+  if (action === 'upgrade-subscription' && !isOrgPlan(plan)) {
+    logger.warn('Blocking checkout - organizations can only subscribe to Team or Enterprise', {
+      userId,
+      referenceId,
+      plan: plan ?? null,
+    })
+    throw new APIError('FORBIDDEN', {
+      message: 'Organizations can only subscribe to Team or Enterprise plans.',
+    })
+  }
+
   if (action === 'upgrade-subscription' && (await hasPaidSubscription(referenceId))) {
     logger.warn('Blocking checkout - active subscription already exists for organization', {
       userId,
       referenceId,
     })
-    return false
+    throw new APIError('CONFLICT', {
+      message:
+        'This organization already has an active subscription. Manage it from the billing settings.',
+    })
   }
 
   if (action === 'upgrade-subscription') {
@@ -51,7 +136,10 @@ export async function authorizeSubscriptionReference(
         userId,
         referenceId,
       })
-      return false
+      throw new APIError('CONFLICT', {
+        message:
+          'This organization has an Enterprise plan setup in progress. Please try again in a few minutes or contact support.',
+      })
     }
   }
 
diff --git a/apps/sim/lib/billing/client/upgrade.ts b/apps/sim/lib/billing/client/upgrade.ts
index 9c4e1472519..23729afe105 100644
--- a/apps/sim/lib/billing/client/upgrade.ts
+++ b/apps/sim/lib/billing/client/upgrade.ts
@@ -181,7 +181,12 @@ export function useSubscriptionUpgrade() {
           }
         )
 
-        await betterAuthSubscription.upgrade(finalParams)
+        const upgradeResult = await betterAuthSubscription.upgrade(finalParams)
+        if (upgradeResult?.error) {
+          throw new Error(
+            upgradeResult.error.message || 'Checkout could not be started. Please try again.'
+          )
+        }
 
         if (targetPlan === 'team' && currentSubscriptionRowId && referenceId !== userId) {
           try {
diff --git a/apps/sim/lib/billing/core/billing.ts b/apps/sim/lib/billing/core/billing.ts
index 68c78849aa7..8202e809d8d 100644
--- a/apps/sim/lib/billing/core/billing.ts
+++ b/apps/sim/lib/billing/core/billing.ts
@@ -86,8 +86,11 @@ export async function getOrganizationSubscription(
 /**
  * Check if a subscription is scoped to an organization by looking up its
  * `referenceId` in the organization table. This is the authoritative
- * answer — the plan name alone is unreliable because `pro_*` plans can be
- * attached to organizations (and we should treat them as org-scoped).
+ * answer — the plan name alone is unreliable because a team plan can be
+ * transiently user-referenced between checkout and webhook re-homing.
+ * (The converse cannot happen: org-referenced subscriptions only ever
+ * hold Team or Enterprise plans, enforced at checkout authorization and
+ * in the Stripe plan sync.)
  *
  * Use this in server contexts (webhooks, jobs) where we only have the
  * subscription row, not a user perspective. If you do have a user id,
diff --git a/apps/sim/lib/billing/core/subscription.test.ts b/apps/sim/lib/billing/core/subscription.test.ts
index ccfceb21889..f5b2c114c08 100644
--- a/apps/sim/lib/billing/core/subscription.test.ts
+++ b/apps/sim/lib/billing/core/subscription.test.ts
@@ -35,8 +35,11 @@ vi.mock('@/lib/billing/core/plan', () => ({
 vi.mock('@/lib/billing/plan-helpers', () => ({
   getPlanTierCredits: mockGetPlanTierCredits,
   isEnterprise: vi.fn().mockReturnValue(false),
+  isOrgPlan: (plan: string | null | undefined) =>
+    plan === 'enterprise' || plan === 'team' || Boolean(plan?.startsWith('team_')),
   isPro: vi.fn(),
   isTeam: vi.fn(),
+  sqlIsPaid: vi.fn(() => ({ type: 'sqlIsPaid' })),
 }))
 
 vi.mock('@/lib/billing/subscriptions/utils', () => ({
@@ -63,10 +66,12 @@ vi.mock('@/lib/core/config/env-flags', () => ({
 vi.mock('@/lib/core/utils/urls', () => urlsMock)
 
 import {
+  getOrganizationCoverageForMember,
   getOrganizationIdForSubscriptionReference,
   hasPaidSubscription,
   hasWorkspaceLiveSyncAccess,
   isWorkspaceOnEnterprisePlan,
+  syncSubscriptionPlan,
 } from '@/lib/billing/core/subscription'
 
 describe('hasPaidSubscription', () => {
@@ -101,6 +106,79 @@ describe('hasPaidSubscription', () => {
   })
 })
 
+describe('syncSubscriptionPlan', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('writes the resolved plan for a user-referenced subscription and returns it', async () => {
+    dbChainMockFns.limit.mockResolvedValueOnce([])
+
+    await expect(syncSubscriptionPlan('sub-1', 'pro_6000', 'pro_25000', 'user-1')).resolves.toBe(
+      'pro_25000'
+    )
+    expect(dbChainMockFns.update).toHaveBeenCalled()
+  })
+
+  it('writes a team plan onto an org-referenced subscription without an org lookup', async () => {
+    await expect(syncSubscriptionPlan('sub-1', 'pro_6000', 'team_6000', 'org-1')).resolves.toBe(
+      'team_6000'
+    )
+    expect(dbChainMockFns.limit).not.toHaveBeenCalled()
+    expect(dbChainMockFns.update).toHaveBeenCalled()
+  })
+
+  it('refuses a pro plan on an org-referenced subscription and returns the current plan', async () => {
+    dbChainMockFns.limit.mockResolvedValueOnce([{ id: 'org-1' }])
+
+    await expect(syncSubscriptionPlan('sub-1', 'team_6000', 'pro_6000', 'org-1')).resolves.toBe(
+      'team_6000'
+    )
+    expect(dbChainMockFns.update).not.toHaveBeenCalled()
+  })
+
+  it('returns the current plan when the Stripe plan is unchanged or unresolved', async () => {
+    await expect(syncSubscriptionPlan('sub-1', 'team_6000', 'team_6000', 'org-1')).resolves.toBe(
+      'team_6000'
+    )
+    await expect(syncSubscriptionPlan('sub-1', 'team_6000', null, 'org-1')).resolves.toBe(
+      'team_6000'
+    )
+    expect(dbChainMockFns.update).not.toHaveBeenCalled()
+  })
+})
+
+describe('getOrganizationCoverageForMember', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+  })
+
+  it('reports covered with the organization id when an entitled paid org exists', async () => {
+    dbChainMockFns.limit.mockResolvedValueOnce([{ organizationId: 'org-1' }])
+
+    await expect(getOrganizationCoverageForMember('user-1')).resolves.toEqual({
+      status: 'covered',
+      organizationId: 'org-1',
+    })
+  })
+
+  it('reports not-covered when the user has no entitled paid org membership', async () => {
+    dbChainMockFns.limit.mockResolvedValueOnce([])
+
+    await expect(getOrganizationCoverageForMember('user-1')).resolves.toEqual({
+      status: 'not-covered',
+    })
+  })
+
+  it('reports unknown on lookup errors so callers fail closed', async () => {
+    dbChainMockFns.limit.mockRejectedValueOnce(new Error('db unavailable'))
+
+    await expect(getOrganizationCoverageForMember('user-1')).resolves.toEqual({
+      status: 'unknown',
+    })
+  })
+})
+
 describe('getOrganizationIdForSubscriptionReference', () => {
   beforeEach(() => {
     vi.clearAllMocks()
diff --git a/apps/sim/lib/billing/core/subscription.ts b/apps/sim/lib/billing/core/subscription.ts
index 09e7b47a950..5ab950c0eb8 100644
--- a/apps/sim/lib/billing/core/subscription.ts
+++ b/apps/sim/lib/billing/core/subscription.ts
@@ -10,9 +10,11 @@ import {
 } from '@/lib/billing/core/plan'
 import {
   getPlanTierCredits,
+  isOrgPlan,
   isEnterprise as isPlanEnterprise,
   isPro as isPlanPro,
   isTeam as isPlanTeam,
+  sqlIsPaid,
 } from '@/lib/billing/plan-helpers'
 import {
   checkEnterprisePlan,
@@ -87,16 +89,53 @@ export async function writeBillingInterval(
 /**
  * Sync the subscription's `plan` column to match Stripe. Closes a gap
  * where plan changes (Pro → Team upgrades, tier swaps) updated price,
- * seats, and referenceId at Stripe but left the DB plan stale. Returns
- * `true` if a write was issued, `false` if no change was needed.
+ * seats, and referenceId at Stripe but left the DB plan stale.
+ *
+ * Enforces the billing invariant that organization-referenced
+ * subscriptions only ever hold Team or Enterprise plans: when Stripe
+ * resolves to a non-org plan (e.g. a Pro price was manually swapped onto
+ * an org subscription in the Stripe dashboard), the write is refused and
+ * an error is logged so operators fix the price in Stripe — the DB row
+ * never becomes an org-scoped Pro subscription.
+ *
+ * Returns the plan the DB row holds after the call. Callers must drive all
+ * downstream processing (org ensure, seat sync, usage limits) from this
+ * value — never from the raw Stripe plan — so a refused write cannot leak
+ * the rejected plan into the rest of the webhook handler.
+ *
+ * The organization lookup is inlined rather than delegated to
+ * `isSubscriptionOrgScoped` because that helper lives in `core/billing.ts`,
+ * which imports this module — delegating would create an import cycle.
  */
 export async function syncSubscriptionPlan(
   subscriptionId: string,
   currentPlan: string | null,
-  planFromStripe: string | null
-): Promise<boolean> {
-  if (!planFromStripe) return false
-  if (currentPlan === planFromStripe) return false
+  planFromStripe: string | null,
+  referenceId: string
+): Promise<string | null> {
+  if (!planFromStripe) return currentPlan
+  if (currentPlan === planFromStripe) return currentPlan
+
+  if (!isOrgPlan(planFromStripe)) {
+    const [referencedOrganization] = await db
+      .select({ id: organization.id })
+      .from(organization)
+      .where(eq(organization.id, referenceId))
+      .limit(1)
+
+    if (referencedOrganization) {
+      logger.error(
+        'Refusing to sync a non-org plan onto an organization-referenced subscription — fix the price in Stripe',
+        {
+          subscriptionId,
+          organizationId: referenceId,
+          currentPlan,
+          rejectedPlan: planFromStripe,
+        }
+      )
+      return currentPlan
+    }
+  }
 
   await db
     .update(subscription)
@@ -109,7 +148,7 @@ export async function syncSubscriptionPlan(
     newPlan: planFromStripe,
   })
 
-  return true
+  return planFromStripe
 }
 
 /**
@@ -188,6 +227,47 @@ export async function hasPaidSubscription(
   }
 }
 
+export type OrganizationCoverageResult =
+  | { status: 'covered'; organizationId: string }
+  | { status: 'not-covered' }
+  | { status: 'unknown' }
+
+/**
+ * Check whether an organization already covers this user with an entitled
+ * paid subscription (the user is a member of the org, any role).
+ *
+ * Used to block redundant personal checkouts: a member of a paid org has
+ * their usage pooled to the org (personal Pro subscriptions are paused on
+ * join), so buying a personal plan would double-bill the same human.
+ *
+ * Returns `'unknown'` on error so callers can fail closed (block checkout
+ * rather than risk a duplicate subscription) with accurate messaging.
+ */
+export async function getOrganizationCoverageForMember(
+  userId: string
+): Promise<OrganizationCoverageResult> {
+  try {
+    const [row] = await db
+      .select({ organizationId: member.organizationId })
+      .from(member)
+      .innerJoin(subscription, eq(subscription.referenceId, member.organizationId))
+      .where(
+        and(
+          eq(member.userId, userId),
+          inArray(subscription.status, ENTITLED_SUBSCRIPTION_STATUSES),
+          sqlIsPaid(subscription.plan)
+        )
+      )
+      .limit(1)
+
+    if (row) return { status: 'covered', organizationId: row.organizationId }
+    return { status: 'not-covered' }
+  } catch (error) {
+    logger.error('Error checking organization coverage for member', { error, userId })
+    return { status: 'unknown' }
+  }
+}
+
 export async function getOrganizationIdForSubscriptionReference(
   referenceId: string
 ): Promise<string | null> {
diff --git a/apps/sim/lib/billing/organization.test.ts b/apps/sim/lib/billing/organization.test.ts
index 8e2a566741b..00709265f20 100644
--- a/apps/sim/lib/billing/organization.test.ts
+++ b/apps/sim/lib/billing/organization.test.ts
@@ -12,6 +12,7 @@ const {
   mockAcquireOrganizationMutationLock,
   mockAssertNoCompetingEnterpriseIssuance,
   mockGetOrganizationIdForSubscriptionReference,
+  mockIsSubscriptionOrgScoped,
 } = vi.hoisted(() => ({
   mockCreateOrganizationWithOwner: vi.fn(),
   mockGetPlanPricing: vi.fn(),
@@ -20,12 +21,14 @@ const {
   mockAcquireOrganizationMutationLock: vi.fn(),
   mockAssertNoCompetingEnterpriseIssuance: vi.fn(),
   mockGetOrganizationIdForSubscriptionReference: vi.fn(),
+  mockIsSubscriptionOrgScoped: vi.fn(),
 }))
 
 vi.mock('@sim/db', () => dbChainMock)
 
 vi.mock('@/lib/billing/core/billing', () => ({
   getPlanPricing: mockGetPlanPricing,
+  isSubscriptionOrgScoped: mockIsSubscriptionOrgScoped,
 }))
 
 vi.mock('@/lib/billing/core/subscription', () => ({
@@ -75,8 +78,10 @@ function queueWhereResponses(responses: unknown[][]) {
     const result = queue.shift() ?? []
     const thenable = Promise.resolve(result) as Promise<unknown[]> & {
       limit: ReturnType<typeof vi.fn>
+      for: ReturnType<typeof vi.fn>
     }
     thenable.limit = vi.fn(() => Promise.resolve(result))
+    thenable.for = vi.fn(() => Promise.resolve(result))
     return thenable as ReturnType<typeof dbChainMockFns.where>
   })
 }
@@ -85,11 +90,11 @@ describe('ensureOrganizationForTeamSubscription', () => {
   beforeEach(() => {
     vi.clearAllMocks()
     resetDbChainMock()
-    mockGetOrganizationIdForSubscriptionReference.mockResolvedValue(null)
+    mockIsSubscriptionOrgScoped.mockResolvedValue(false)
   })
 
-  it('treats existing legacy organization ids as organization references', async () => {
-    mockGetOrganizationIdForSubscriptionReference.mockResolvedValue('legacy-org-id')
+  it('treats existing organization references as already homed and takes no write', async () => {
+    mockIsSubscriptionOrgScoped.mockResolvedValueOnce(true)
 
     const result = await ensureOrganizationForTeamSubscription({
       id: 'sub-1',
@@ -108,6 +113,7 @@ describe('ensureOrganizationForTeamSubscription', () => {
     })
     expect(mockCreateOrganizationWithOwner).not.toHaveBeenCalled()
     expect(mockAttachOwnedWorkspacesToOrganization).not.toHaveBeenCalled()
+    expect(dbChainMockFns.update).not.toHaveBeenCalled()
     expect(mockAcquireOrganizationMutationLock).toHaveBeenCalledWith(
       expect.anything(),
       'legacy-org-id'
@@ -120,7 +126,7 @@ describe('ensureOrganizationForTeamSubscription', () => {
   })
 
   it('allows the authoritative Enterprise webhook to apply its own unresolved issuance', async () => {
-    mockGetOrganizationIdForSubscriptionReference.mockResolvedValue('org-enterprise')
+    mockIsSubscriptionOrgScoped.mockResolvedValueOnce(true)
 
     const result = await ensureOrganizationForTeamSubscription({
       id: 'sub-enterprise',
@@ -139,6 +145,39 @@ describe('ensureOrganizationForTeamSubscription', () => {
     )
   })
 
+  it('transfers a user-referenced team subscription onto the org the user administers', async () => {
+    mockIsSubscriptionOrgScoped.mockResolvedValueOnce(false)
+    queueWhereResponses([
+      // membership lookup: user owns an org
+      [{ id: 'member-1', organizationId: 'org-owned', role: 'owner' }],
+      // locked membership re-read inside the transfer transaction
+      [{ organizationId: 'org-owned', role: 'owner' }],
+      // locked subscription re-read inside the transfer transaction
+      [{ id: 'sub-1', referenceId: 'user-1', plan: 'team' }],
+      // locked organization re-read
+      [{ id: 'org-owned' }],
+      // duplicate check: org has no entitled subscription
+      [],
+    ])
+
+    const result = await ensureOrganizationForTeamSubscription({
+      id: 'sub-1',
+      plan: 'team',
+      referenceId: 'user-1',
+      status: 'active',
+      seats: 2,
+    })
+
+    expect(result.referenceId).toBe('org-owned')
+    expect(dbChainMockFns.update).toHaveBeenCalled()
+    expect(mockAttachOwnedWorkspacesToOrganization).toHaveBeenCalledWith({
+      ownerUserId: 'user-1',
+      organizationId: 'org-owned',
+      externalMemberPolicy: 'keep-external',
+    })
+    expect(mockCreateOrganizationWithOwner).not.toHaveBeenCalled()
+  })
+
   it('keeps org creation, subscription transfer, and workspace attachment on the caller transaction', async () => {
     queueWhereResponses([[], [], [{ name: 'Owner', email: 'owner@example.com' }]])
     mockAttachOwnedWorkspacesToOrganizationTx.mockRejectedValueOnce(
diff --git a/apps/sim/lib/billing/organization.ts b/apps/sim/lib/billing/organization.ts
index 56a720708f5..a7af195844b 100644
--- a/apps/sim/lib/billing/organization.ts
+++ b/apps/sim/lib/billing/organization.ts
@@ -4,7 +4,7 @@ import { createLogger } from '@sim/logger'
 import { isOrgAdminRole } from '@sim/platform-authz/workspace'
 import { generateId } from '@sim/utils/id'
 import { and, eq, inArray, ne, sql } from 'drizzle-orm'
-import { getPlanPricing } from '@/lib/billing/core/billing'
+import { getPlanPricing, isSubscriptionOrgScoped } from '@/lib/billing/core/billing'
 import { getOrganizationIdForSubscriptionReference } from '@/lib/billing/core/subscription'
 import { syncUsageLimitsFromSubscription } from '@/lib/billing/core/usage'
 import { assertNoCompetingEnterpriseIssuance } from '@/lib/billing/enterprise-outbox'
@@ -108,25 +108,26 @@ export async function ensureOrganizationForTeamSubscription(
     return subscription
   }
 
-  const referencedOrganizationId = await getOrganizationIdForSubscriptionReference(
-    subscription.referenceId
-  )
-
-  if (referencedOrganizationId) {
+  if (await isSubscriptionOrgScoped(subscription)) {
     await db.transaction(async (tx) => {
-      await acquireOrganizationMutationLock(tx, referencedOrganizationId)
+      await acquireOrganizationMutationLock(tx, subscription.referenceId)
       await assertNoCompetingEnterpriseIssuance(
         tx,
-        referencedOrganizationId,
+        subscription.referenceId,
         subscription.enterpriseOperationId ?? null
       )
     })
-    return {
-      ...subscription,
-      referenceId: referencedOrganizationId,
-    }
+    return subscription
   }
 
+  /**
+   * The subscription references a user. Team/Enterprise subscriptions must be
+   * org-referenced, so fall through to the membership resolution below: it
+   * transfers the row onto the org the user administers (with duplicate
+   * checks under the org mutation lock) or creates a new organization. This
+   * keeps re-homing deterministic in the webhook flow instead of depending on
+   * a client-side transfer call after checkout.
+   */
   const userId = subscription.referenceId
 
   logger.info('Creating organization for team subscription', {
@@ -165,10 +166,29 @@ export async function ensureOrganizationForTeamSubscription(
           subscription.enterpriseOperationId ?? null
         )
 
+        /**
+         * Re-verify the pre-transaction membership read under the org
+         * mutation lock: a concurrent removal or role change must not let a
+         * stale admin membership authorize the transfer.
+         */
+        const [lockedMembership] = await tx
+          .select({ organizationId: member.organizationId, role: member.role })
+          .from(member)
+          .where(
+            and(eq(member.userId, userId), eq(member.organizationId, membership.organizationId))
+          )
+          .limit(1)
+        if (!lockedMembership || !isOrgAdminRole(lockedMembership.role)) {
+          throw new Error(
+            `User ${userId} no longer administers organization ${membership.organizationId}`
+          )
+        }
+
         const [lockedSub] = await tx
           .select({
             id: subscriptionTable.id,
             referenceId: subscriptionTable.referenceId,
+            plan: subscriptionTable.plan,
           })
           .from(subscriptionTable)
           .where(eq(subscriptionTable.id, subscription.id))
@@ -182,6 +202,12 @@ export async function ensureOrganizationForTeamSubscription(
           return
         }
 
+        if (!isOrgPlan(lockedSub.plan)) {
+          throw new Error(
+            `Subscription ${subscription.id} is no longer a team/enterprise plan (${lockedSub.plan})`
+          )
+        }
+
         const [lockedOrg] = await tx
           .select({ id: organization.id })
           .from(organization)
diff --git a/apps/sim/lib/billing/organizations/membership.ts b/apps/sim/lib/billing/organizations/membership.ts
index c4a11c8e699..571c652b02e 100644
--- a/apps/sim/lib/billing/organizations/membership.ts
+++ b/apps/sim/lib/billing/organizations/membership.ts
@@ -312,6 +312,133 @@ export async function restoreUserProSubscription(userId: string): Promise<Restor
   return result
 }
 
+export interface PauseProForOrgCoverageResult {
+  /**
+   * True when an entitled paid organization covers this user — regardless of
+   * whether this call changed any state (the personal Pro may already be
+   * pausing). Callers gate coverage-dependent behavior on this, never on
+   * `paused`, so repeated invocations stay consistent.
+   */
+  covered: boolean
+  /** True only when this call transitioned the personal Pro to cancel at period end. */
+  paused: boolean
+  subscriptionId?: string
+  organizationId?: string
+}
+
+/**
+ * Pause (cancel at period end) a user's entitled personal Pro subscription
+ * because an organization with an entitled paid subscription already covers
+ * them. Transactional fence behind the checkout admission guard: it closes
+ * the race where a user starts a personal checkout while uncovered, joins a
+ * paid org mid-checkout, and completes payment after the join.
+ *
+ * The user keeps the period they paid for and the subscription simply does
+ * not renew — the same state a paid-org joiner's personal Pro enters, so the
+ * billing UI already renders it. If they leave the org before period end,
+ * `restoreUserProSubscription` un-pauses it automatically.
+ *
+ * Unlike `applyPaidOrgJoinBillingTx` (the join-time pause), this does NOT
+ * snapshot or zero current-period usage: by the time this runs the user's
+ * usage already attributes to the organization pool, and moving it into the
+ * pro snapshot would undercount the org's period.
+ *
+ * Idempotent: no state change when there is no entitled personal Pro, when
+ * it is already pausing, or when no entitled paid org covers the user. All
+ * checks re-run under the user billing identity lock and a `FOR UPDATE` read
+ * of the personal subscription row — the same serialization points as the
+ * join and restore paths.
+ */
+export async function pauseProSubscriptionForOrgCoverage(
+  userId: string
+): Promise<PauseProForOrgCoverageResult> {
+  const result: PauseProForOrgCoverageResult = { covered: false, paused: false }
+
+  await db.transaction(async (tx) => {
+    await acquireUserBillingIdentityLock(tx, userId)
+
+    /**
+     * Coverage is determined before (and independent of) the personal-sub
+     * lookup: `covered` reports the organization's coverage truth even when
+     * no entitled personal Pro row exists, exactly as the result contract
+     * promises. Callers gate free→paid transition handling on it, so a
+     * personal-sub lookup miss must not read as "not covered".
+     */
+    const memberships = await tx
+      .select({ organizationId: member.organizationId })
+      .from(member)
+      .where(eq(member.userId, userId))
+    if (memberships.length === 0) return
+
+    const organizationSubscriptions = await tx
+      .select({ plan: subscriptionTable.plan, referenceId: subscriptionTable.referenceId })
+      .from(subscriptionTable)
+      .where(
+        and(
+          inArray(
+            subscriptionTable.referenceId,
+            memberships.map((membership) => membership.organizationId)
+          ),
+          inArray(subscriptionTable.status, ENTITLED_SUBSCRIPTION_STATUSES)
+        )
+      )
+    const coveringSubscription = organizationSubscriptions.find((organizationSubscription) =>
+      isPaid(organizationSubscription.plan)
+    )
+    if (!coveringSubscription) return
+
+    result.covered = true
+    result.organizationId = coveringSubscription.referenceId
+
+    const [personalPro] = await tx
+      .select()
+      .from(subscriptionTable)
+      .where(
+        and(
+          eq(subscriptionTable.referenceId, userId),
+          inArray(subscriptionTable.status, ENTITLED_SUBSCRIPTION_STATUSES),
+          sqlIsPro(subscriptionTable.plan)
+        )
+      )
+      .for('update')
+      .limit(1)
+
+    if (!personalPro) return
+
+    result.subscriptionId = personalPro.id
+
+    if (personalPro.cancelAtPeriodEnd) return
+
+    await tx
+      .update(subscriptionTable)
+      .set({ cancelAtPeriodEnd: true })
+      .where(eq(subscriptionTable.id, personalPro.id))
+
+    if (personalPro.stripeSubscriptionId) {
+      await enqueueOutboxEvent(tx, OUTBOX_EVENT_TYPES.STRIPE_SYNC_CANCEL_AT_PERIOD_END, {
+        stripeSubscriptionId: personalPro.stripeSubscriptionId,
+        subscriptionId: personalPro.id,
+        reason: 'covered-by-organization',
+      })
+    }
+
+    result.paused = true
+  })
+
+  if (result.paused) {
+    logger.warn(
+      'Paused personal Pro created while covered by an organization subscription (kept until period end, Stripe sync queued)',
+      {
+        userId,
+        subscriptionId: result.subscriptionId,
+        organizationId: result.organizationId,
+      }
+    )
+  }
+
+  return result
+}
+
 export interface AddMemberParams {
   userId: string
   organizationId: string
diff --git a/apps/sim/lib/billing/organizations/pause-pro-for-coverage.test.ts b/apps/sim/lib/billing/organizations/pause-pro-for-coverage.test.ts
new file mode 100644
index 00000000000..4c8e50dedea
--- /dev/null
+++ b/apps/sim/lib/billing/organizations/pause-pro-for-coverage.test.ts
@@ -0,0 +1,145 @@
+/**
+ * @vitest-environment node
+ */
+import { dbChainMock, dbChainMockFns, resetDbChainMock } from '@sim/testing'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { mockEnqueueOutboxEvent } = vi.hoisted(() => ({
+  mockEnqueueOutboxEvent: vi.fn(),
+}))
+
+vi.mock('@sim/db', () => dbChainMock)
+vi.mock('@/lib/billing/storage/payer-transfer', () => ({
+  changeOrganizationWorkspaceBilledAccountsInTx: vi.fn(),
+  changeWorkspaceStoragePayerInTx: vi.fn(),
+  changeWorkspaceStoragePayersInTx: vi.fn(),
+}))
+vi.mock('@/lib/core/outbox/service', () => ({
+  enqueueOutboxEvent: mockEnqueueOutboxEvent,
+}))
+
+import { pauseProSubscriptionForOrgCoverage } from '@/lib/billing/organizations/membership'
+import { OUTBOX_EVENT_TYPES } from '@/lib/billing/webhooks/outbox-handlers'
+
+const ACTIVE_PERSONAL_PRO = {
+  id: 'sub-personal',
+  plan: 'pro_6000',
+  referenceId: 'user-1',
+  status: 'active',
+  cancelAtPeriodEnd: false,
+  stripeSubscriptionId: 'stripe-sub-personal',
+}
+
+/**
+ * Queues per-`where()` results for the three reads in the pause path:
+ * personal sub (`.for('update').limit(1)`), memberships (awaited where),
+ * and org subscriptions (awaited where).
+ */
+function queueWhereResponses(responses: unknown[][]) {
+  const queue = [...responses]
+  dbChainMockFns.where.mockImplementation(() => {
+    const result = queue.shift() ?? []
+    const limit = vi.fn(() => Promise.resolve(result))
+    const forResult = Promise.resolve(result) as Promise<unknown[]> & { limit: typeof limit }
+    forResult.limit = limit
+    const thenable = Promise.resolve(result) as Promise<unknown[]> & {
+      limit: typeof limit
+      for: () => typeof forResult
+    }
+    thenable.limit = limit
+    thenable.for = vi.fn(() => forResult)
+    return thenable as ReturnType<typeof dbChainMockFns.where>
+  })
+}
+
+describe('pauseProSubscriptionForOrgCoverage', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    resetDbChainMock()
+  })
+
+  it('pauses the personal Pro and queues the Stripe sync when an entitled paid org covers the user', async () => {
+    queueWhereResponses([
+      [{ organizationId: 'org-1' }],
+      [{ plan: 'team_6000', referenceId: 'org-1' }],
+      [ACTIVE_PERSONAL_PRO],
+      // update ... set ... where consumes one more where() call
+      [],
+    ])
+
+    const result = await pauseProSubscriptionForOrgCoverage('user-1')
+
+    expect(result).toEqual({
+      covered: true,
+      paused: true,
+      subscriptionId: 'sub-personal',
+      organizationId: 'org-1',
+    })
+    expect(dbChainMockFns.set).toHaveBeenCalledWith({ cancelAtPeriodEnd: true })
+    expect(mockEnqueueOutboxEvent).toHaveBeenCalledWith(
+      expect.anything(),
+      OUTBOX_EVENT_TYPES.STRIPE_SYNC_CANCEL_AT_PERIOD_END,
+      {
+        stripeSubscriptionId: 'stripe-sub-personal',
+        subscriptionId: 'sub-personal',
+        reason: 'covered-by-organization',
+      }
+    )
+  })
+
+  it('reports covered even when no entitled personal Pro row exists', async () => {
+    queueWhereResponses([
+      [{ organizationId: 'org-1' }],
+      [{ plan: 'team_6000', referenceId: 'org-1' }],
+      [],
+    ])
+
+    const result = await pauseProSubscriptionForOrgCoverage('user-1')
+
+    expect(result).toEqual({
+      covered: true,
+      paused: false,
+      organizationId: 'org-1',
+    })
+    expect(dbChainMockFns.update).not.toHaveBeenCalled()
+    expect(mockEnqueueOutboxEvent).not.toHaveBeenCalled()
+  })
+
+  it('reports covered without pausing again when the personal Pro is already pausing', async () => {
+    queueWhereResponses([
+      [{ organizationId: 'org-1' }],
+      [{ plan: 'team_6000', referenceId: 'org-1' }],
+      [{ ...ACTIVE_PERSONAL_PRO, cancelAtPeriodEnd: true }],
+    ])
+
+    const result = await pauseProSubscriptionForOrgCoverage('user-1')
+
+    expect(result).toEqual({
+      covered: true,
+      paused: false,
+      subscriptionId: 'sub-personal',
+      organizationId: 'org-1',
+    })
+    expect(dbChainMockFns.update).not.toHaveBeenCalled()
+    expect(mockEnqueueOutboxEvent).not.toHaveBeenCalled()
+  })
+
+  it('reports not covered when the user is not a member of any organization', async () => {
+    queueWhereResponses([[]])
+
+    const result = await pauseProSubscriptionForOrgCoverage('user-1')
+
+    expect(result).toEqual({ covered: false, paused: false })
+    expect(dbChainMockFns.update).not.toHaveBeenCalled()
+  })
+
+  it('reports not covered when no org subscription is an entitled paid plan', async () => {
+    queueWhereResponses([[{ organizationId: 'org-1' }], []])
+
+    const result = await pauseProSubscriptionForOrgCoverage('user-1')
+
+    expect(result).toEqual({ covered: false, paused: false })
+    expect(dbChainMockFns.update).not.toHaveBeenCalled()
+    expect(mockEnqueueOutboxEvent).not.toHaveBeenCalled()
+  })
+})
diff --git a/apps/sim/lib/billing/plan-helpers.ts b/apps/sim/lib/billing/plan-helpers.ts
index b74ed0ff448..e905c671399 100644
--- a/apps/sim/lib/billing/plan-helpers.ts
+++ b/apps/sim/lib/billing/plan-helpers.ts
@@ -47,11 +47,13 @@ export function isPaid(plan: string | null | undefined): boolean {
 }
 
 /**
- * True when the plan **name** is a team/enterprise plan. This is a
- * plan-name check, NOT a scope check — a `pro_*` plan attached to an
- * organization is org-scoped at the billing level even though this
- * returns `false` for it. For scope decisions use
- * `isOrgScopedSubscription` (sync) or `isSubscriptionOrgScoped` (async).
+ * True when the plan **name** is a team/enterprise plan — the only plans
+ * that may be referenced to an organization (org-referenced subscriptions
+ * never hold `pro_*` plans; checkout authorization and the Stripe plan
+ * sync both enforce this). This is a plan-name check, NOT a scope check:
+ * a team plan can be transiently user-referenced between checkout and
+ * webhook re-homing. For scope decisions use `isOrgScopedSubscription`
+ * (sync) or `isSubscriptionOrgScoped` (async).
  */
 export function isOrgPlan(plan: string | null | undefined): boolean {
   return isTeam(plan) || isEnterprise(plan)
diff --git a/apps/sim/lib/billing/webhooks/subscription.ts b/apps/sim/lib/billing/webhooks/subscription.ts
index 321415adb23..6ce6c72f5de 100644
--- a/apps/sim/lib/billing/webhooks/subscription.ts
+++ b/apps/sim/lib/billing/webhooks/subscription.ts
@@ -150,75 +150,6 @@ async function transitionOrganizationToDormantState(
   }
 }
 
-export async function handleOrganizationPlanDowngrade(
-  subscriptionData: {
-    id: string
-    plan: string | null
-    referenceId: string
-    status: string | null
-  },
-  stripeEventId?: string
-): Promise<void> {
-  if (!(await isSubscriptionOrgScoped({ referenceId: subscriptionData.referenceId }))) {
-    return
-  }
-
-  const stillTeamOrEnterprise = isTeam(subscriptionData.plan) || isEnterprise(subscriptionData.plan)
-  if (stillTeamOrEnterprise) {
-    return
-  }
-
-  const [currentRow] = await db
-    .select({ plan: subscription.plan })
-    .from(subscription)
-    .where(eq(subscription.id, subscriptionData.id))
-    .limit(1)
-
-  if (currentRow && (isTeam(currentRow.plan) || isEnterprise(currentRow.plan))) {
-    logger.info('Skipping plan downgrade transition - subscription is currently Team/Enterprise', {
-      subscriptionId: subscriptionData.id,
-      organizationId: subscriptionData.referenceId,
-      eventPlan: subscriptionData.plan,
-      currentPlan: currentRow.plan,
-    })
-    return
-  }
-
-  const idempotencyIdentifier = stripeEventId ?? `plan-downgrade:${subscriptionData.id}`
-
-  try {
-    await stripeWebhookIdempotency.executeWithIdempotency(
-      'organization-plan-downgrade',
-      idempotencyIdentifier,
-      async () => {
-        const result = await transitionOrganizationToDormantState(
-          subscriptionData.referenceId,
-          subscriptionData.id
-        )
-
-        if (result.workspacesDetached > 0 || result.restoredProCount > 0) {
-          logger.info('Transitioned organization to dormant state after plan downgrade', {
-            organizationId: subscriptionData.referenceId,
-            subscriptionId: subscriptionData.id,
-            plan: subscriptionData.plan,
-            ...result,
-          })
-        }
-
-        return result
-      }
-    )
-  } catch (error) {
-    logger.error('Failed to transition organization to dormant state on plan downgrade', {
-      organizationId: subscriptionData.referenceId,
-      subscriptionId: subscriptionData.id,
-      plan: subscriptionData.plan,
-      error,
-    })
-    throw error
-  }
-}
-
 /**
  * Handle new subscription creation - reset usage if transitioning from free to paid
  */
@@ -333,10 +264,10 @@ export async function handleSubscriptionCreated(
 /**
  * Handles a subscription deletion (cancel) event. Bills any final-period
  * overages, resets usage, and transitions the organization to a dormant
- * state via `transitionOrganizationToDormantState` — the same path used
- * by plan downgrades. Wrapped in `stripeWebhookIdempotency` so duplicate
- * event deliveries collapse to one execution; if any step throws, the
- * webhook retries from scratch.
+ * state via `transitionOrganizationToDormantState` — the sole trigger for
+ * detaching an organization's workspaces. Wrapped in
+ * `stripeWebhookIdempotency` so duplicate event deliveries collapse to one
+ * execution; if any step throws, the webhook retries from scratch.
  */
 export async function handleSubscriptionDeleted(
   subscription: {
diff --git a/apps/sim/lib/workspaces/organization-workspaces.ts b/apps/sim/lib/workspaces/organization-workspaces.ts
index c44505bbd82..428610ac014 100644
--- a/apps/sim/lib/workspaces/organization-workspaces.ts
+++ b/apps/sim/lib/workspaces/organization-workspaces.ts
@@ -1,3 +1,4 @@
+import { AuditAction, AuditResourceType, recordAuditBatch } from '@sim/audit'
 import { db } from '@sim/db'
 import { member, permissions, workspace } from '@sim/db/schema'
 import { createLogger } from '@sim/logger'
@@ -410,6 +411,32 @@ export async function detachOrganizationWorkspaces(
     return [...workspaceIds].sort()
   })
 
+  const workspacesById = new Map(
+    organizationWorkspaces.map((organizationWorkspace) => [
+      organizationWorkspace.id,
+      organizationWorkspace,
+    ])
+  )
+  recordAuditBatch(
+    detachedWorkspaceIds.map((detachedWorkspaceId) => {
+      const detachedWorkspace = workspacesById.get(detachedWorkspaceId)
+      return {
+        workspaceId: detachedWorkspaceId,
+        actorId: null,
+        actorName: 'Billing System',
+        action: AuditAction.WORKSPACE_UPDATED,
+        resourceType: AuditResourceType.WORKSPACE,
+        resourceId: detachedWorkspaceId,
+        description: 'Workspace detached from organization after its subscription ended',
+        metadata: {
+          organizationId,
+          previousBilledAccountUserId: detachedWorkspace?.billedAccountUserId ?? null,
+          newBilledAccountUserId: organizationOwnerId ?? detachedWorkspace?.ownerId ?? null,
+        },
+      }
+    })
+  )
+
   logger.info('Detached organization workspaces', {
     organizationId,
     detachedWorkspaceCount: detachedWorkspaceIds.length,
diff --git a/packages/audit/src/index.ts b/packages/audit/src/index.ts
index f3ec73f8c5d..2813a231de4 100644
--- a/packages/audit/src/index.ts
+++ b/packages/audit/src/index.ts
@@ -1,3 +1,3 @@
-export { recordAudit } from './log'
+export { recordAudit, recordAuditBatch } from './log'
 export type { AuditActionType, AuditResourceTypeValue } from './types'
 export { AuditAction, AuditResourceType } from './types'
diff --git a/packages/audit/src/log.test.ts b/packages/audit/src/log.test.ts
index e47485ee085..98a71773e65 100644
--- a/packages/audit/src/log.test.ts
+++ b/packages/audit/src/log.test.ts
@@ -37,7 +37,7 @@ vi.mock('@sim/utils/id', () => ({
 }))
 
 import { sleep } from '@sim/utils/helpers'
-import { AuditAction, AuditResourceType, recordAudit } from './index'
+import { AuditAction, AuditResourceType, recordAudit, recordAuditBatch } from './index'
 
 const flush = () => sleep(10)
 
@@ -385,6 +385,68 @@ describe('recordAudit', () => {
   })
 })
 
+describe('recordAuditBatch', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    resetDbChainMock()
+  })
+
+  it('writes all entries in a single insert', async () => {
+    recordAuditBatch([
+      {
+        workspaceId: 'ws-1',
+        actorId: null,
+        actorName: 'Billing System',
+        action: AuditAction.WORKSPACE_UPDATED,
+        resourceType: AuditResourceType.WORKSPACE,
+        resourceId: 'ws-1',
+      },
+      {
+        workspaceId: 'ws-2',
+        actorId: null,
+        actorName: 'Billing System',
+        action: AuditAction.WORKSPACE_UPDATED,
+        resourceType: AuditResourceType.WORKSPACE,
+        resourceId: 'ws-2',
+      },
+    ])
+
+    await flush()
+
+    expect(dbChainMockFns.insert).toHaveBeenCalledTimes(1)
+    expect(dbChainMockFns.values).toHaveBeenCalledWith([
+      expect.objectContaining({ workspaceId: 'ws-1', actorId: null, actorName: 'Billing System' }),
+      expect.objectContaining({ workspaceId: 'ws-2', actorId: null, actorName: 'Billing System' }),
+    ])
+  })
+
+  it('does nothing for an empty batch', async () => {
+    recordAuditBatch([])
+
+    await flush()
+
+    expect(dbChainMockFns.insert).not.toHaveBeenCalled()
+  })
+
+  it('does not throw when the batch insert fails', async () => {
+    dbChainMockFns.values.mockImplementation(() => Promise.reject(new Error('DB connection lost')))
+
+    expect(() => {
+      recordAuditBatch([
+        {
+          workspaceId: 'ws-1',
+          actorId: null,
+          actorName: 'Billing System',
+          action: AuditAction.WORKSPACE_UPDATED,
+          resourceType: AuditResourceType.WORKSPACE,
+        },
+      ])
+    }).not.toThrow()
+
+    await flush()
+  })
+})
+
 describe('auditMock sync', () => {
   it('has the same AuditAction keys as the source', () => {
     const sourceKeys = Object.keys(AuditAction).sort()
diff --git a/packages/audit/src/log.ts b/packages/audit/src/log.ts
index 3a9a6ef66d4..93381ae43b7 100644
--- a/packages/audit/src/log.ts
+++ b/packages/audit/src/log.ts
@@ -44,10 +44,73 @@ export function recordAudit(params: AuditLogParams): void {
   })
 }
 
-async function insertAuditLog(params: AuditLogParams): Promise<void> {
-  const ipAddress = params.request ? getClientIp(params.request) : undefined
-  const userAgent = params.request?.headers.get('user-agent') ?? undefined
+/**
+ * Rows per INSERT statement. Keeps each statement's bind-parameter count
+ * far below Postgres's 65k limit while still writing large batches in a
+ * handful of round-trips.
+ */
+const AUDIT_BATCH_CHUNK_SIZE = 500
+
+/**
+ * Fire-and-forget batch audit write: one INSERT per chunk instead of one
+ * pooled query per entry, so callers auditing many resources at once (e.g.
+ * a bulk workspace detach) do not fan out N concurrent pool checkouts.
+ *
+ * Unlike {@link recordAudit} there is no lazy actor resolution — entries
+ * are inserted exactly as provided. Callers must pass an `actorId` that is
+ * a real `user.id` or `null`, and should supply `actorName`/`actorEmail`
+ * labels for system actors.
+ */
+export function recordAuditBatch(entries: AuditLogParams[]): void {
+  insertAuditLogBatch(entries).catch((error) => {
+    logger.error('Failed to record audit log batch', { error, count: entries.length })
+  })
+}
 
+/**
+ * Build the `audit_log` row for an entry. Shared by the single and batch
+ * insert paths so the write shape cannot drift between them. Actor fields
+ * are taken as-is — lazy actor resolution is layered on top by
+ * {@link recordAudit} only.
+ */
+function buildAuditRow(
+  params: AuditLogParams,
+  actor: { actorId: string | null; actorName?: string | null; actorEmail?: string | null }
+) {
+  return {
+    id: generateShortId(),
+    workspaceId: params.workspaceId || null,
+    actorId: actor.actorId,
+    action: params.action,
+    resourceType: params.resourceType,
+    resourceId: params.resourceId,
+    actorName: actor.actorName ?? undefined,
+    actorEmail: actor.actorEmail ?? undefined,
+    resourceName: params.resourceName,
+    description: params.description,
+    metadata: params.metadata ?? {},
+    ipAddress: params.request ? getClientIp(params.request) : undefined,
+    userAgent: params.request?.headers.get('user-agent') ?? undefined,
+  }
+}
+
+async function insertAuditLogBatch(entries: AuditLogParams[]): Promise<void> {
+  if (entries.length === 0) return
+
+  const rows = entries.map((params) =>
+    buildAuditRow(params, {
+      actorId: params.actorId,
+      actorName: params.actorName,
+      actorEmail: params.actorEmail,
+    })
+  )
+
+  for (let index = 0; index < rows.length; index += AUDIT_BATCH_CHUNK_SIZE) {
+    await db.insert(auditLog).values(rows.slice(index, index + AUDIT_BATCH_CHUNK_SIZE))
+  }
+}
+
+async function insertAuditLog(params: AuditLogParams): Promise<void> {
   let { actorName, actorEmail } = params
 
   /**
@@ -81,19 +144,5 @@ async function insertAuditLog(params: AuditLogParams): Promise<void> {
     }
   }
 
-  await db.insert(auditLog).values({
-    id: generateShortId(),
-    workspaceId: params.workspaceId || null,
-    actorId,
-    action: params.action,
-    resourceType: params.resourceType,
-    resourceId: params.resourceId,
-    actorName: actorName ?? undefined,
-    actorEmail: actorEmail ?? undefined,
-    resourceName: params.resourceName,
-    description: params.description,
-    metadata: params.metadata ?? {},
-    ipAddress,
-    userAgent,
-  })
+  await db.insert(auditLog).values(buildAuditRow(params, { actorId, actorName, actorEmail }))
 }
diff --git a/packages/testing/src/mocks/audit.mock.ts b/packages/testing/src/mocks/audit.mock.ts
index 6bf30bbc24d..6e8a1b49a4e 100644
--- a/packages/testing/src/mocks/audit.mock.ts
+++ b/packages/testing/src/mocks/audit.mock.ts
@@ -14,6 +14,7 @@ import { vi } from 'vitest'
  */
 export const auditMockFns = {
   mockRecordAudit: vi.fn(),
+  mockRecordAuditBatch: vi.fn(),
 }
 
 /**
@@ -26,6 +27,7 @@ export const auditMockFns = {
  */
 export const auditMock = {
   recordAudit: auditMockFns.mockRecordAudit,
+  recordAuditBatch: auditMockFns.mockRecordAuditBatch,
   AuditAction: {
     API_KEY_CREATED: 'api_key.created',
     API_KEY_UPDATED: 'api_key.updated',