Backdate Oklahoma TANF, Wisconsin Works, and Ohio Works First parameters

[hua7450]

Summary

Fixes #7208
Fixes #6867
Fixes #7051
Fixes #7201

Updates Oklahoma TANF, Wisconsin Works, and Ohio Works First parameter effective dates from placeholder dates to historically accurate dates based on regulatory research.

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Oklahoma TANF Changes

Effective Date Updates

Parameter	Old Date	New Date	Rationale
Payment standard	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Need standard	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Minimum benefit	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Work expense deduction	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Dependent care deduction	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Earned income disregard rate	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Gross income limit rate	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Resource limit	2021-01-01	1996-10-01	Oklahoma TANF implementation date
Earned income disregard cap	2010-07-01	2015-09-15	OAC 340:10-3-31.1 adopted per Oklahoma Register Vol. 32, Issue 24

Reference Formatting Fixes

• Cleaned up reference titles to follow parameter pattern conventions (removed redundant suffixes)
• Corrected earned income disregard rate reference from OAC 340:10-3-31.1 to OAC 340:10-3-33(2)
• Added underscores to large values in need_standard.yaml (e.g., 1068 → 1_068)

Oklahoma Regulatory Authority

• Oklahoma TANF Implementation: October 1, 1996 (effective date of 60-month lifetime limit per OAC 340:10-1-3)
• Earned Income Disregard Program: September 15, 2015 (adopted per Oklahoma Register Vol. 32, Issue 24)

Oklahoma Sources

• OAC 340:10-3-59 - Assistance benefits
• OAC 340:10-3-27 - Gross income test
• OAC 340:10-3-33 - Earned income exemptions
• OAC 340:10-3-31.1 - Earned income disregard
• OKDHS Appendix C-1, Schedule IX-A
• Oklahoma Policy Institute - TANF History

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Wisconsin Works Changes

Effective Date Updates

Parameter	Old Date	New Date	Rationale
Asset limit	2025-01-01	1997-05-01	1995 Act 289 (W-2 implementation)
Vehicle exclusion	2025-01-01	1997-05-01	1995 Act 289 (W-2 implementation)
Income limit (115% FPL)	2025-01-01	1997-05-01	1995 Act 289 (W-2 implementation)
ARP pregnancy threshold	2025-01-01	1997-09-01	1995 Act 289 (W-2 implementation)
CMC infant age limit	2025-01-01	2011-10-01	2011 Act 32 (changed from 12 to 8 weeks)

Payment Amount History

Placement	Old Date	New Dates	Values	Rationale
CSJ	2013-01-01: $653	1997-09-01: $673 2011-10-01: $653	Decreased $20	2011 Act 32
W2_TRANSITION	2013-01-01: $608	1997-09-01: $628 2011-10-01: $608	Decreased $20	2011 Act 32
CMC	2013-01-01: $673	1997-09-01: $673	Unchanged	1995 Act 289
ARP	2013-01-01: $673	1997-09-01: $673	Unchanged	1995 Act 289

Wisconsin Regulatory Authority

• 1995 Wisconsin Act 289: Created Wisconsin Works (W-2), signed April 25, 1996, effective May 1, 1997
• 2011 Wisconsin Act 32: Reduced CSJ/W2T payments and changed CMC infant age from 12 weeks to 8 weeks, effective October 1, 2011

Wisconsin Sources

• 1995 Wisconsin Act 289 - Created Wisconsin Works
• Wisconsin Statute 49.145 - Asset and income limits
• Wisconsin Statute 49.148 - Payment amounts
• 2011 Wisconsin Act 32 - Budget act with W-2 changes
• 2011 Act 32 Effective Dates (Section 9400) - October 1, 2011 for W-2 changes
• 1997 Statute 49.148 - Original payment amounts
• W-2 Manual Release 09-01 - 2010 CSJ payment $673
• W-2 Manual Release 12-02 - 2011 CSJ payment $653
• CBPP TANF Benefit Levels - Historical payment comparison

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Ohio Works First Changes

Effective Date Updates

Parameter	Old Date	New Date	Rationale
Earned income flat disregard	2023-10-01	1999-10-01	H.B. 283 made disregard permanent
Earned income percentage	2023-10-01	1999-10-01	H.B. 283 made disregard permanent
Initial eligibility income limit	2023-10-01	1997-10-01	ORC § 5107.10 original effective date
Max group size	2025-01-01	1997-10-01	ORC § 5107.04 original effective date
Payment standard amounts	2025-01-01	2017-01-01	Base year for COLA calculation
Additional person increment	2025-01-01	2017-01-01	Base year for COLA calculation

New COLA Multiplier Parameter

Added cola_multiplier.yaml to dynamically calculate payment standards using 2017 base amounts × cumulative Social Security COLA:

Year	COLA %	Cumulative Multiplier
2017	-	1.0000
2018	2.0%	1.0200
2019	2.8%	1.0486
2020	1.6%	1.0653
2021	1.3%	1.0792
2022	5.9%	1.1429
2023	8.7%	1.2423
2024	3.2%	1.2821
2025	2.5%	1.3141

Formula Update

Updated oh_owf_payment_standard.py to calculate: base_2017_amount × cola_multiplier

This approach:

• Stores immutable 2017 base values
• Applies cumulative COLA for any simulation year
• Matches actual published amounts within ±$2 (due to compounding rounding)

Ohio Regulatory Authority

• ORC § 5107.04: Requires OWF payment standards increase by Social Security COLA each January (effective January 1, 2009)
• ORC § 5107.10: Sets initial eligibility at 50% of Federal Poverty Level (effective October 1, 1997)
• H.B. 283 (1999): Made $250 + 50% earned income disregard permanent (effective October 1, 1999)

Ohio Sources

• Ohio Revised Code § 5107.04 - COLA requirement
• Ohio Revised Code § 5107.10 - Initial eligibility
• Ohio Administrative Code § 5101:1-23-40 - Payment standards
• ODJFS ACT Letter No. 262 - January 2017 COLA increase
• Social Security Administration COLA History - Annual COLA percentages

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dff5637) to head (d940b43).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##             main     #7209       +/-   ##
============================================
+ Coverage   76.71%   100.00%   +23.28%     
============================================
  Files        3665         1     -3664     
  Lines       52702        18    -52684     
  Branches      263         0      -263     
============================================
- Hits        40432        18    -40414     
+ Misses      12244         0    -12244     
+ Partials       26         0       -26     

Flag	Coverage Δ
unittests	100.00% <100.00%> (+23.28%)	⬆️

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