OpenTaxSolver
An open-source program that calculates entries for US federal and state personal income tax forms.
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About OpenTaxSolver
OpenTaxSolver (OTS) works out the line entries for federal and state personal income tax returns in the United States. It can fill out the actual government forms automatically so you can print them and mail them in.
It is updated every year for the new tax year; versions for tax year 2025 were posted in February 2026. You can use it through a graphical interface or from the command line. It suits people with fairly straightforward returns who prefer to do the arithmetic themselves rather than use a commercial tax service.
Strengths
- Covers both federal and state personal income tax forms
- Fills out and prints the official forms for mailing
- Updated each year for the current tax year
- Usable through a GUI or the command line
Limitations
- US taxes only
- Output is printed and mailed rather than e-filed
- Introductory videos are several years old
Details
- Pricing
- FreeFree and open source.
- License
- Open source, license not stated
- Platforms
- Command line
- How it runs
- Downloadable app
- Best suited for
- US taxpayers with simple returns who want a free, local alternative to commercial tax software
- Categories
- Personal finance
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
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