- https://github.com/ustaxes/UsTaxes
- http://opentaxsolver.sourceforge.net/
- https://sites.google.com/view/incometaxspreadsheet
- https://www.freefilefillableforms.com
- https://taxsim.app/ https://news.ycombinator.com/item?id=31925871
- https://directfile.irs.gov/
- https://www.freetaxusa.com/
- https://kunle.app/feb-2021-how-to-dismantle-turbotax.html
- https://news.ycombinator.com/item?id=26330584
Has the potential to model the full tax code?
use OpenFisca to encode your own country's tax law https://github.com/PolicyEngine/policyengine-us https://news.ycombinator.com/item?id=34584215