Virginia TANF: va_tanf_countable_earned_income deducts SNAP's FY2020 standard deduction; Virginia uses the SNAP standard deduction in effect

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@PavelMakarchuk 已经在做这个了。

开始于 2026年10月16日。

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Issue 类型
缺陷
描述清晰度
基本清楚
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活跃
技术栈
python
领域
backend, databases

调研方向

Find the definition of va_tanf_countable_earned_income and the parameter gov.states.va.dss.tanf.income.deductions.earned.flat; read how the parameter is dated and how assistance-unit size is used. Compare that logic with gov.usda.snap.income.deductions.standard and the cited Virginia manual. Done when the January 2025 example matches the intended SNAP deduction and relevant tests pass.

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描述

bug hhs/tanf states/va

Summary

va_tanf_countable_earned_income subtracts gov.states.va.dss.tanf.income.deductions.earned.flat: $167 (1-3 people), $178 (4), $209 (5), $240 (6+), dated 2016-01-01. Those are SNAP's fiscal-year-2020 standard deductions, copied from the 11/20 TANF Manual that the parameter cites (305.1 A.2, page 29). Virginia's TANF standard deduction is the SNAP one, and the manual's table has moved with SNAP:

  • Virginia TANF Manual (7/24) 305.1 A.2.b ("Screening at the Standard of Assistance", page dated 10/23): "All AUs will be allowed the following deductions from earned income: The standard deduction*, the same amount used in the standard deduction for the SNAP program, and 20% of the remainder is deducted from the gross earnings." Its table: $198 (1-3), $208 (4), $244 (5), $279 (6+), SNAP's FY2024 amounts.
  • 305.3 B.3: "A standard deduction is subtracted from the gross earned income for the assistance unit whose income is not otherwise exempt."

SNAP's standard deduction (48 states, gov.usda.snap.income.deductions.standard) is $198/$208/$244/$279 from October 2023, $204/$217/$254/$291 from October 2024 and $209/$223/$261/$299 from October 2025. The 7/24 manual is the newest on the VDSS manual page, so its table still shows the FY2024 amounts; its text ties the deduction to SNAP's.

Repro

Same result on 1.811.2 (45d51ef5d4) and on main (26348e7cf7).

from policyengine_us import Simulation
s = Simulation(situation={
    "people": {"a": {"age": {"2025": 30}, "employment_income": {"2025": 6_000}},
               "b": {"age": {"2025": 8}}, "c": {"age": {"2025": 5}}},
    "tax_units": {"t": {"members": ["a", "b", "c"]}},
    "spm_units": {"s": {"members": ["a", "b", "c"], "is_tanf_enrolled": {"2025": True}}},
    "families": {"f": {"members": ["a", "b", "c"]}},
    "households": {"h": {"members": ["a", "b", "c"], "state_name": {"2025": "VA"}}},
})
s.calculate("va_tanf_countable_earned_income", "2025-01")  # 266.40 = 0.8 x (500 - 167)

Expected in January 2025: 236.80 = 0.8 x (500 - 204) with SNAP's FY2025 deduction (241.60 = 0.8 x (500 - 198) with the manual's table).

Possible fix

Compute the flat deduction from gov.usda.snap.income.deductions.standard (contiguous states) by assistance-unit size, or add the values from the manual's tables with their dates (and fix the 2016-01-01 date on the FY2020 values).

Impact on the PRD comparison

2025 aligned view, shared set: 3 Virginia units, $1,325 lower PE TANF (2026: $1,534).

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