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v1US Federal
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| 1 | # United States — Related Open-Source Projects |
| 2 | |
| 3 | OpenAccountants is AGPL-3.0. All projects below have compatible licenses. Projects below can be incorporated with attribution. |
| 4 | |
| 5 | ## policyengine-us |
| 6 | |
| 7 | - Repository: [PolicyEngine/policyengine-us](https://github.com/PolicyEngine/policyengine-us) |
| 8 | - License: AGPL-3.0 |
| 9 | - Stars: 145 |
| 10 | - Language: Python |
| 11 | - Scope: The definitive US tax-benefit microsimulation model. Covers federal income tax, EITC, CTC, SNAP, Medicaid, SSI, state income taxes for all 50 states, and more. |
| 12 | - Integration: Same AGPL-3.0 license — fully compatible. Federal and state tax computation logic can be directly incorporated. |
| 13 | |
| 14 | ## py1040 |
| 15 | |
| 16 | - Repository: [b-k/py1040](https://github.com/b-k/py1040) |
| 17 | - License: GPL-2.0 |
| 18 | - Stars: 338 |
| 19 | - Language: Python |
| 20 | - Scope: US personal income tax calculator implementing Form 1040. Covers standard/itemized deductions, tax brackets, credits. |
| 21 | - Integration: GPL-2.0 is compatible with AGPL-3.0 (downstream must remain AGPL-3.0). Form 1040 logic and bracket calculations can be adapted. |
| 22 | |
| 23 | ## Tax-Calculator |
| 24 | |
| 25 | - Repository: [PSLmodels/Tax-Calculator](https://github.com/PSLmodels/Tax-Calculator) |
| 26 | - License: Custom open-source |
| 27 | - Stars: 297 |
| 28 | - Language: Python |
| 29 | - Scope: USA Federal Individual Income and Payroll Tax Microsimulation Model. Academic-grade tax policy analysis tool. |
| 30 | - Integration: Custom open-source license — verify specific terms before incorporating. Useful as a reference for federal tax policy modeling and validation. |
| 31 |
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Q2: Research-verified
Deep research against tax authority sources. Not yet tested on real data.
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USty-2025
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