Backdate Kentucky K-TAP parameters#7497
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Starting implementation of backdating Kentucky K-TAP (TANF) parameters to program inception. Documentation and parallel development will follow. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add 1997-07-01 historical entries to all 10 parameter files (frozen AFDC-era values) - Add Nov 2025 payment maximum reduction (~35% cut) - Create earned_income_flat_disregard parameter for pre-2023 $30+1/3 formula - Rewrite EID formula as unified expression (no branching, both eras via parameters) - Add 92 new tests: 47 historical/boundary + 45 edge cases across all 3 eras - Add dual references (current + superseded 921 KAR 2:016) - Fix gross_income_limit_rate pre-2023 section citation (1(11) → 1(12)) - Clean up hardcoded comments in benefit and dependent care variables Ref PolicyEngine#7496 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #7497 +/- ##
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+ Coverage 97.82% 100.00% +2.17%
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Files 3 3
Lines 92 55 -37
Branches 2 1 -1
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- Hits 90 55 -35
+ Misses 1 0 -1
+ Partials 1 0 -1
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…urce - Fix earned_income_flat_disregard.yaml: subsection 5(3)(c)-(d) → 5(3)(e), add current ref - Fix earned_income_disregard_rate.yaml: pre-2023 subsection 5(3)(c)-(d) → 5(3)(e) - Add WKMS news source citation for Nov 2025 payment maximum values Ref PolicyEngine#7496 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
4 parameters had identical values at both 1997-07-01 and 2023-03-01. Per parameter patterns skill, only keep earliest date when value is unchanged: - gross_income_limit_rate: 1.85 (single entry) - rate: 0.55 (single entry) - max_unit_size: 7 (single entry) - child_support_disregard: 50 (single entry) Ref PolicyEngine#7496 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Create earned_income_flat_disregard_in_effect.yaml (true 1997, false 2023) - Remove 2023-03-01: 0 sentinel from earned_income_flat_disregard.yaml - Use if p.in_effect: branching in formula instead of relying on flat=0 The zero-sentinel anti-pattern (value=0 meaning "not in effect") violates PolicyEngine conventions. An explicit boolean is clearer and self-documenting. Ref PolicyEngine#7496 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Backdates Kentucky K-TAP (TANF) parameters to 1997 (program inception) and adds a unified earned income disregard formula supporting both the pre-2023 AFDC-era "$30 + 1/3" and post-2023 "50%" disregards.
Closes #7496
Changes
earned_income_flat_disregard($30 pre-2023, $0 post-2023)flat + rate * (earned - flat)— handles both eras without branchingThree Parameter Eras
Regulatory Sources
Review Summary
Known Limitations
Test Plan
make formatclean