Fix Indiana TANF to pay the maximum benefit (IC 12-14-2-5)

[hua7450]

Summary

Indiana TANF was paying the standard of need ($255 for a family of two) instead of the amount of assistance / maximum benefit ($409 effective 2024-07-01). This corrects the benefit to the IC 12-14-2-5 maximum benefit and adds the post-2025 income eligibility screens. For a zero-income family of two the modeled benefit goes from $255 to $409 (July 2024 onward).

Regulatory authority

• IC 12-14-2-5 (amount of assistance; payment made; maximum amounts) — payment schedule of $248 / $409 / +$104 per additional member, effective 2024-07-01 via SEA 265 (2023).
• IC 12-14-1-1.7 — post-2025 gross income eligibility: ≤35% FPL through June 30, 2027, then ≤50% FPL.
• FSSA SNAP/TANF Program Policy Manual, Chapter 3000 — §3050.10.00 (maximum benefits), §3010.15.00 (initial gross/net standards), §3010.15.05 (100% FPL continuing standard).
• FSSA SNAP/TANF Transmittal 2024 — maximum benefits updated effective 7/1/2024.

What changed

New parameters (gov/states/in/fssa/tanf/):

• amount_of_assistance/amount.yaml — maximum benefit by unit size, tiers at 1997-10-01, 2023-07-01, and 2024-07-01 ($248/$409/$513/.../$1,241).
• amount_of_assistance/max_table_size.yaml (10) + additional_member_amount.yaml ($104 from 2024-07-01) for units above size 10.
• eligibility/initial/gross_income/fpg_rate.yaml (35% from 2025-07-01, 50% from 2027-07-01) and eligibility/initial/net_income/maximum_grant_rate.yaml (100% of the maximum grant from 2025-07-01).

New variables: in_tanf_maximum_benefit, in_tanf_gross_income.

Updated variables: in_tanf and in_tanf_payment_eligible now use the maximum benefit; in_tanf_countable_income_eligible applies the post-2025 gross + net initial screens while preserving the pre-2025 standard-of-need test and the 100% FPL continuing test. in_tanf_payment_standard (standard of need) is unchanged apart from a period.this_year alignment on the size lookup.

Behavior

• Zero-income family of two: $255 (Jan 2024, still the 2023-07 tier) → $409 (from July 2024). Pre-July-2024 and historical amounts unchanged.
• The 2024-07-01 increase also widens payment eligibility (income between the old standard of need and the new maximum grant now yields a benefit).
• Post-2025 initial applicants are screened on gross income (≤35%/50% FPL) and countable net income (< maximum grant); enrolled recipients keep the 100% FPL test. For Indiana the net (maximum-grant) standard binds before the looser gross screen.

Test plan

• New in_tanf_maximum_benefit.yaml and in_tanf_gross_income.yaml; expanded in_tanf, payment-eligibility, countable-income-eligibility, integration, and edge-case tests covering the 2023/2024 increases, the post-2025 screens, the size-10 / size-11 boundary, and the negative-income benefit cap.
• make format passes; all expected values independently verified via direct simulation.

Verification note

Amounts are verified against primary sources. The current FSSA Chapter 3000 labels the maximum-benefit chart "effective 7/1/2025", while FSSA Transmittal 2024 and the enrolled SEA 265 amendment to IC 12-14-2-5 specify 7/1/2024; this PR models the statutory/transmittal date (2024-07-01) and cites both.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (86f5d87) to head (59e6086).
⚠️ Report is 150 commits behind head on main.

Additional details and impacted files

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unittests	100.00% <100.00%> (ø)

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