PolicyEngine

Issues somebody may already be working on are listed last. List everything by date

• Replay every OBR-costed fiscal event, June 2010 to Autumn Budget 2025

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  Difficulty 5/5 Over a week Newbie friendliness 8/100

  PolicyEngine/policyengine-scorecard#156 · 1 comment · Opened Oct 9, 2026

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• Restore Scotland population live coverage with the fixed PolicyEngine bundle

  May be free again A pull request for this issue was closed without being merged. Open

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  PolicyEngine/policyengine-api#3876 · Opened Oct 8, 2026

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• Scoped UK runs give the region UK-wide business rates and region-relative ranks

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  Difficulty 5/5 Over a week Newbie friendliness 15/100

  PolicyEngine/policyengine.py#567 · Opened Oct 8, 2026

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• Publish complete ACS-local WIC participation and remove the temporary .py assumption

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  PolicyEngine/microcosm#1154 · Opened Oct 8, 2026

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• MN 2023 20Kpwages 1Kintrec

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  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  PolicyEngine/policyengine-taxsim#1409 · Opened Oct 8, 2026

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• Drill 3: mock Autumn Budget on Monday 12 October (instructions, candidate reforms and model risks)

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  Difficulty 5/5 Over a week Newbie friendliness 5/100

  PolicyEngine/uk-autumn-budget-dashboard-2026#10 · Opened Oct 8, 2026

• OBR labour supply elasticities treat cohabiting parents as lone parents (is_married is legal marriage)

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  Difficulty 3/5 1-2 days Newbie friendliness 55/100

  PolicyEngine/policyengine-uk#2190 · Opened Oct 8, 2026

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• [] Bill Triage

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  bill-triage

  Difficulty 3/5 1-2 days Newbie friendliness 48/100

  PolicyEngine/state-legislative-tracker#225 · Opened Oct 8, 2026

• Add a UK pipeline methodology page

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  Difficulty 5/5 Over a week Newbie friendliness 45/100

  PolicyEngine/microcosm.institute#83 · Opened Oct 8, 2026

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• Remove transitional cache access after country migrations

  May be free again A pull request for this issue was closed without being merged. Open

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PolicyEngine/policyengine-core#602 · Opened Oct 7, 2026

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• Childcare funding rates are CPI-uprated 2024-25 values, below DfE's published 2025-26 and 2026-27 rates

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  Difficulty 2/5 1-3 hours Newbie friendliness 72/100

  PolicyEngine/policyengine-uk#2183 · Opened Oct 7, 2026

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• Exclude joint occupiers and separately liable sharers from the severe disability premium's non-dependant test

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  Difficulty 4/5 3-5 days Newbie friendliness 54/100

  PolicyEngine/policyengine-uk#2181 · Opened Oct 7, 2026

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• Vermont child tax credit: the $20-per-$1,000 reduction is applied once to the total credit, but 32 V.S.A. 5830f(b) reduces each child's credit

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  bug state-income-tax states/vt

  Difficulty 2/5 1-3 hours Newbie friendliness 78/100

  PolicyEngine/policyengine-us#9996 · Opened Oct 7, 2026

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• Migrate US staging run files to the version 2 contract

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PolicyEngine/microcosm#1135 · Opened Oct 7, 2026

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• Cross-check notes: CBP estimate, take-up draw noise, projected bunchers

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  Difficulty 3/5 1-2 days Newbie friendliness 48/100

  PolicyEngine/uk-childcare-100k-threshold#7 · Opened Oct 7, 2026

• Every tax unit files for refundable credits in the certified release: no EITC non-filers

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  PolicyEngine/microcosm#1133 · Opened Oct 7, 2026

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• Federal-EITC-by-state cross-check is in-sample: the certified release calibrates State EITC claims and amounts

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  Difficulty 4/5 3-5 days Newbie friendliness 57/100

  PolicyEngine/microcosm#1132 · Opened Oct 7, 2026

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• Virginia TANF: va_tanf pays two-parent (TANF-UP) units the 2020 TANF-UP standards, below the TANF standards; current law and manual give them the TANF standards

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  bug hhs/tanf states/va

  Difficulty 4/5 3-5 days Newbie friendliness 56/100

  PolicyEngine/policyengine-us#9987 · Opened Oct 7, 2026

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• 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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  bug hhs/tanf states/va

  Difficulty 3/5 1-2 days Newbie friendliness 63/100

  PolicyEngine/policyengine-us#9986 · Opened Oct 7, 2026

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• Michigan FIP and Virginia TANF: mi_fip and va_tanf pay amounts under the states' $10 minimum

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  bug hhs/tanf states/mi states/va

  Difficulty 3/5 1-2 days Newbie friendliness 67/100

  PolicyEngine/policyengine-us#9985 · Opened Oct 7, 2026

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• New Hampshire FANF: recipient_rate gives every recipient the 75% Cliff Effect pilot disregard from September 2022; He-W 654.13(e) and FAM 603.01 set 50%

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  bug hhs/tanf states/nh

  Difficulty 2/5 1-3 hours Newbie friendliness 72/100

  PolicyEngine/policyengine-us#9984 · Opened Oct 7, 2026

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• Massachusetts TAFDC: the dependent care deduction is subtracted per earner (twice for two non-joint earners, half lost for a one-earner joint return)

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  bug hhs/tanf states/ma

  Difficulty 3/5 1-2 days Newbie friendliness 55/100

  PolicyEngine/policyengine-us#9983 · Opened Oct 7, 2026

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• Florida TCA: fl_tca_200_and_half_disregard_eligible ignores current receipt, so enrolled units lose the $200 and 1/2 disregard

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  bug hhs/tanf states/fl

  Difficulty 4/5 3-5 days Newbie friendliness 66/100

  PolicyEngine/policyengine-us#9982 · Opened Oct 7, 2026

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• Migrate parameter and supplied-input caching to Core APIs

  May be free again A pull request for this issue was closed without being merged. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 30/100

  PolicyEngine/policyengine-uk#2175 · Opened Oct 7, 2026

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• Migrate simulation caching to Core ownership APIs

  May be free again A pull request for this issue was closed without being merged. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  PolicyEngine/policyengine-us#9978 · Opened Oct 7, 2026

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• Define explicit cache ownership contracts through Phase 6

  May be free again A pull request for this issue was closed without being merged. Open

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  PolicyEngine/policyengine-core#598 · Opened Oct 7, 2026

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• UK: two-page note on how constituency impacts are estimated (draft for the Budget-day analysis)

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PolicyEngine/microcosm#1131 · 1 comment · Opened Oct 7, 2026

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• Move Stage 12 output planning behind country-owned typed contracts

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PolicyEngine/policyengine-sim-api#729 · Opened Oct 7, 2026

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• Salary sacrifice above the April 2029 NI cap raises adjusted net income, but HMRC says the cap leaves ANI unchanged

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  Difficulty 4/5 3-5 days Newbie friendliness 57/100

  PolicyEngine/policyengine-uk#2173 · Opened Oct 7, 2026

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• UK: keep constituency and local-authority results available through a switch to Microcosm, then serve them from its local-area dataset

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PolicyEngine/policyengine-sim-api#728 · Opened Oct 7, 2026

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• Implement Ohio HEAP regular heating assistance

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  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  PolicyEngine/policyengine-us#9966 · Opened Oct 7, 2026

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• taxsim_tfica includes state employee payroll contributions; TAXSIM's FICA is OASDI and HI only

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  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 78/100

  PolicyEngine/policyengine-us#9952 · Opened Oct 7, 2026

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• Minnesota working family credit: filers 65+ whose only qualifying child is 18 or older get $0

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 72/100

  PolicyEngine/policyengine-us#9951 · Opened Oct 7, 2026

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• Alabama itemized deductions count tax unit dependents' FICA and self-employment tax

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  Difficulty 3/5 1-2 days Newbie friendliness 70/100

  PolicyEngine/policyengine-us#9941 · Opened Oct 6, 2026

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• Tax-input coverage gaps surfaced by the reform-validation registry on us-6.2.1 (tracker)

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PolicyEngine/microcosm#1117 · Opened Oct 6, 2026

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• reform_validation registry: four state rows measure the wrong quantity at policyengine-us 2.2.1 (IA HF1020, MN WFC, ID CTC, CO CTC), and state SPM rate rows need a sampling SE

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  PolicyEngine/microcosm#1116 · Opened Oct 6, 2026

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• Ohio: `oh_eitc` is applied before the credits that R.C. 5747.98 and the Schedule of Credits place ahead of it

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  Difficulty 4/5 3-5 days Newbie friendliness 52/100

  PolicyEngine/policyengine-us#9921 · Opened Oct 6, 2026

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• Personal casualty losses are non-deductible from 2018 in PolicyEngine, but §165(h)(5) still allows losses attributable to federally (and, from 2026, State) declared disasters

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  Difficulty 5/5 Over a week Newbie friendliness 45/100

  PolicyEngine/policyengine-us#9920 · Opened Oct 6, 2026

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• Does the current executable leave the self-employment tax deduction in 2021–2023 QBI above the threshold?

  Possibly taken @feenberg claimed this today. Open

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  2021 2022 2023

  PolicyEngine/policyengine-taxsim#1417 · 1 assignee · Opened Oct 9, 2026

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• Does the current executable start the federal EITC phase-out at zero income?

  Possibly taken @feenberg claimed this today. Open

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  2021 2022 2023 2024 2025

  PolicyEngine/policyengine-taxsim#1416 · 1 assignee · Opened Oct 9, 2026

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• Check the UK nation filters against policyengine-uk's country formula

  Possibly taken @MaxGhenis claimed this 1 day ago. Open

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  Difficulty 3/5 1-2 days Newbie friendliness 35/100

  PolicyEngine/policyengine.py#569 · Opened Oct 9, 2026

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• Employer Class 1 rate is 13.8% in 2022-23; the Health and Social Care Levy set 15.05%

  Possibly taken @MaxGhenis claimed this today. Open

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  Difficulty 3/5 1-2 days Newbie friendliness 18/100

  PolicyEngine/policyengine-uk#2226 · Opened Oct 9, 2026

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• Update policyengine to 6.2.3

  Possibly taken @policyengine claimed this today. Open

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  Difficulty 1/5 Under an hour Newbie friendliness 15/100

  PolicyEngine/policyengine-sim-api#734 · Opened Oct 9, 2026

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• Add the Housing Benefit special £20 earnings disregard

  Possibly taken @anth-volk claimed this 1 day ago. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 12/100

  PolicyEngine/policyengine-uk#2224 · Opened Oct 9, 2026

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• Add protected Housing Benefit family premiums with explicit history input

  Possibly taken @anth-volk claimed this 1 day ago. Open

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  Difficulty 5/5 Over a week Newbie friendliness 8/100

  PolicyEngine/policyengine-uk#2222 · Opened Oct 9, 2026

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• Add Housing Benefit child disability premiums from qualifying benefits

  Possibly taken @anth-volk claimed this 1 day ago. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 15/100

  PolicyEngine/policyengine-uk#2220 · Opened Oct 9, 2026

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• Add the Housing Benefit permitted-work earnings disregard

  Possibly taken @anth-volk claimed this 1 day ago. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 15/100

  PolicyEngine/policyengine-uk#2218 · Opened Oct 9, 2026

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• Apply the Housing Benefit personal allowance for main-phase ESA claimants

  Possibly taken @anth-volk claimed this 1 day ago. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 15/100

  PolicyEngine/policyengine-uk#2216 · Opened Oct 9, 2026

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• Support the Housing Benefit residential capital tariff exception

  Possibly taken @anth-volk claimed this 1 day ago. Open

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  Difficulty 4/5 3-5 days Newbie friendliness 18/100

  PolicyEngine/policyengine-uk#2214 · Opened Oct 9, 2026

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• Add the 2015–2017 Housing Benefit non-dependant deduction scale history

  Possibly taken @anth-volk claimed this 1 day ago. Open

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  Difficulty 3/5 1-2 days Newbie friendliness 15/100

  PolicyEngine/policyengine-uk#2212 · Opened Oct 9, 2026

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