Every number traces to IRS rules and your source documents. All computation runs in your browser — your data never leaves your device.
Clone, run, and file your taxes in your browser. No server, no account required.
16 tool definitions, SSE streaming, and REST API for AI-powered tax agents.
Plugin Docs →Tax software should be transparent, private, and free. We built OpenTax to prove it's possible.
No upsells, no paywalls. MIT-licensed, open-source. Every feature available to everyone.
Every number traces back to source documents and IRS rules. Click any line to see exactly how it was computed.
All computation runs in your browser. No server, no account, no tracking. Your tax data stays yours.
Deterministic rules engine with 1,700+ tests cross-referenced against IRS publications. View Trust Center.
Run it standalone for personal filing, or integrate it into AI-powered tools as an OpenClaw plugin.
Clone the repo, run npm run dev, and file your taxes in your browser.
Upload W-2s and 1099s, walk through a guided interview, and download IRS-ready PDFs.
Tax filing as an agent tool. 16 tool definitions, SSE streaming, and a REST API — purpose-built for conversational AI agents.
Comprehensive coverage for common federal tax situations, with more forms being added.
Three steps to a completed return. No account required.
Import your W-2s, 1099s, and other tax documents. Data is extracted locally in your browser.
Walk through a guided interview. Every computed value is explainable — click to trace it back to source.
Download IRS-ready PDF forms for e-filing through IRS Free File or printing for mail submission.
Run OpenTax locally in under a minute. All you need is Node.js.
$ git clone https://github.com/xavierliwei/opentax.git
$ cd opentax
$ npm install
$ npm run dev
# Open http://localhost:5173 in your browser