Add historical TANF parameter data (pre-2018) for DE, MO, PA, RI, SD

[hua7450]

Summary

Fixes #7169

Adds historical TANF parameter data (pre-2018) for five states, implements Pennsylvania's Work Expense Reimbursement (WER) mechanism for the 2009-2020 period, and fixes Rhode Island FY2025 payment standard dates and values.

Changes

Historical Parameter Updates

State	Parameter	Old Start	New Start	Notes
DE	deficit_rate	2024-10-01	2011-10-01	50% deficit rate per 2011 State Plan
MO	minimum_payment	2024-01-01	2002-01-01	$10 rule from 1948 AFDC (13 CSR 40-2.120)
RI	dependent_care/amount	2019-01-01	2008-07-01	Rhode Island Works inception
SD	max_table_size	2023-07-01	2016-09-01	Matches other payment standard files

Pennsylvania Work Expense Restructure

Added support for two distinct work expense mechanisms:

Work Expense Reimbursement (WER) - 2009-2020:

• $50/month flat bonus added to TANF benefit
• Paid to families with earned income
• Source: PA DHS Cash Assistance Handbook Section 137.4

Work Expense Deduction (WED) - 2020+:

• $200/month deducted from countable earned income
• Applied after 50% earned income disregard
• Source: PA DHS TANF State Plan 2024, p.13

New parameter structure:

pa/dhs/tanf/income/work_expense/
├── uses_deduction.yaml    # false (2009) → true (2020)
├── deduction.yaml         # $200 WED amount
└── reimbursement.yaml     # $50 WER amount

Rhode Island Payment Standard Fixes

• Date correction: Changed FY2025 effective date from 2024-09-01 to 2024-07-01 in payment_standard/amount.yaml and additional_person.yaml. The FY2025 budget specifies July 1 as the effective date; DHS issued retroactive payments to cover the July-September gap (DHS press release). Now consistent with earned_income_disregard/amount.yaml which already used 2024-07-01.
• Value correction: Fixed sizes 7 ($1,364 → $1,365) and 8 ($1,489 → $1,490) to match 218-RICR-20-00-2.18.1.

References

Pennsylvania

• PA DHS Cash Assistance Handbook Section 137.4 (WER)
• PA DHS TANF State Plan 2024 (WED)
• 55 Pa. Code 183.94 - Eligibility for TANF earned income deductions

Delaware

• Delaware TANF State Plan 2011
• 16 Del. Admin. Code SS 4000-4008

Missouri

• 13 CSR 40-2.120 - Missouri minimum payment

Rhode Island

• R.I. Gen. Laws Chapter 40-5.2 - Rhode Island Works Act of 2008
• 218-RICR-20-00-2.18 - Payment Standards
• DHS FY2025 Benefit Increase Press Release

South Dakota

• ARSD 67:10:05:03 - Payment Standards (2016)
• ARSD 67:10:05:03 - Payment Standards (current)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (5063055) to head (f4f8302).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7170   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         2    +1     
  Lines           24        36   +12     
=========================================
+ Hits            24        36   +12     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[PavelMakarchuk]

PR Review: Add Historical TANF Parameter Data for DE, MO, PA, RI, SD

Summary

This PR adds historical TANF parameter data for five states and implements Pennsylvania's Work Expense Reimbursement (WER) mechanism for the 2009-2020 period. It also includes changes to Illinois HBWD.

---

✅ Verified Changes

1. Missouri Minimum Payment

Source: 13 CSR 40-2.120

The regulation confirms:

"If the determined need results in a grant of less than ten dollars ($10) in AFDC cases, no cash payment will be made."
"Original rule filed April 12, 1948, effective April 22, 1948."

Parameter	Old Date	New Date	Status
minimum_payment.yaml	2024-01-01	2002-01-01	✓ Reasonable

2. Rhode Island Works Dependent Care

Source: R.I. Gen. Laws Chapter 40-5.2

"All provisions of R.I. Gen. Laws Chapter 40-5.2 became effective and apply to all applicants and recipients on or after July 1, 2008."

Parameter	Old Date	New Date	Status
dependent_care/amount.yaml	2019-01-01	2008-07-01	✓ Verified

3. Pennsylvania Work Expense Restructure

Sources:

• PA DHS Cash Assistance Handbook Section 137.4
• Just Harvest - PA TANF Changes

WER (2009-2020): $50/month bonus for families with earned income
WED (2020+): $200/month deducted from countable income after 50% disregard

New Parameter	Value	Purpose
uses_deduction.yaml	false (2009) → true (2020)	Toggle mechanism
reimbursement.yaml	$50	WER bonus amount
deduction.yaml	$200	WED deduction amount

---

⚠️ Unverified (Sources Cited but Not Independently Confirmed)

State	Parameter	New Date	Source
Delaware	deficit_rate.yaml	2011-10-01	DE TANF State Plan 2011
South Dakota	max_table_size.yaml	2016-09-01	ARSD 67:10:05:03 (2016)

---

🔴 Issues Requiring Attention

1. Illinois HBWD is_blind Removal

The PR removes is_blind from HBWD disability eligibility:

# Before
return is_disabled | is_blind | receives_ssdi

# After  
return is_disabled | receives_ssdi

Concern: IL HBWD is "Health Benefits for Workers with Disabilities" - blindness is typically a qualifying disability. Please verify this change against 89 Ill. Admin. Code § 120.510.

2. Deleted Test File

il_hbwd_countable_earned_income.yaml (292 lines) was deleted. If the formula simplification is correct, equivalent test coverage should be maintained.

3. Removed Test Cases

Cases 4-5 were removed from il_hbwd_income_eligible.yaml without explanation.

---

Recommendation

Consider splitting this PR:

1. Historical backdating (DE, MO, RI, SD, PA WER) - ready to merge
2. Illinois HBWD refactoring - needs verification of is_blind removal

---

Validation Summary

Check	Result
MO minimum payment	✅ Verified
RI Works effective date	✅ Verified
PA WER/WED mechanism	✅ Verified
DE deficit rate	⚠️ Source cited
SD max table size	⚠️ Source cited
IL HBWD changes	❌ Needs verification
CI Status	✅ Passing

[baogorek]

Hey @hua7450 — following up on your question on #7440 about other states that might have similar gaps.

I scanned all TANF parameter YAMLs for earliest start dates >= 2019 and found 60 additional files across 8 states not covered by this PR:

State	Files	Earliest Start	Notes
WA	7	2024-01-01	6 files (payment_standard, income limit, max family size, etc.) all start Jan 2024
CA	18	2021-01-01 to 2023-10-01	Payment tables, income limits, resource limits, disregards
VA	14	2020-07-01	Need standards and grant standards (groups 2 & 3)
IN	10	2023-07-01	All 10 files at same date — eligibility, disregards, resources, standard of need
CO	8	2021-01-01 to 2022-03-01	Grant standard, need standard, earned exclusion
MT	2	2023-07-01	Income standards (benefit & payment FPG rates)

Note: backdate_parameters in system.py extends all params to 2015-01-01 at runtime, so these may not crash — but the backdated values would be wrong if the actual historical rates differed. Washington is the highest-risk state with 6 files starting at 2024-01-01.

This aligns with the "189 files across 24 states" audit mentioned in #7169. Just flagging in case it's useful for prioritizing.

[baogorek]

This fix is blocking the calibration pipeline rebuild in policyengine-us-data. The missing deficit_rate parameter causes SNAP calculation to fail for Delaware (state_fips=10) during per-state precomputation, which cascades into a KeyError: 'snap' during matrix assembly.

Without this, we can't rebuild the calibration package with the latest policyengine-us (needed for ACA PTC support).

[PavelMakarchuk]

LGTM after these