SelfTax

Spec sheet

Purpose

SelfTax reads tax documents, calculates a federal return, and auto-fills supported free IRS filing sites.Read 8 Oct 2026 · github.com

Privacy

The README says SSNs, names, and addresses are stored in browser local storage and never transmitted.Read 8 Oct 2026 · github.com

Browser extension

The README instructs users to build and load SelfTax as a Chrome extension.Read 8 Oct 2026 · github.com

Document parsing

Structured IRS forms are processed locally; AI is used only to parse unstructured documents when needed.Read 8 Oct 2026 · github.com

Intended user

The maker describes the project as built for people who want to avoid paying for tax preparation or spending hours filing their taxes.Read 8 Oct 2026 · github.com

Local server

An optional local HTTP server uses the Claude Code CLI to parse redacted documents, and the user’s Anthropic API key is managed by that CLI.Read 8 Oct 2026 · github.com

MCP integration

SelfTax can run as an MCP server for Claude Code and exposes tools to scan tax folders, set a profile, view documents, calculate taxes, and generate forms.Read 8 Oct 2026 · github.com

Open-source license

SelfTax is licensed under AGPL-3.0, which the README says requires products or services built using the code to open-source their version under the same license.Read 8 Oct 2026 · github.com

Redaction

Before unstructured document text is sent for AI interpretation, the README says identifying details are replaced with tokens locally.Read 8 Oct 2026 · github.com

Supported filing

Tested and verified support includes W-2 wages, rental income with passive activity loss, capital loss carryover, itemized deductions, child tax credit, dependent care credit, and QBI deduction for tax year 2025.Read 8 Oct 2026 · github.com

Tax calculations

Tax calculations use deterministic code, and the README says each line can be audited.Read 8 Oct 2026 · github.com

Unverified coverage

The README lists several features as built but not fully tested, including Schedule C, K-1, education credits, EITC, AMT, and self-employment tax.Read 8 Oct 2026 · github.com

Plans and prices

Every SelfTax plan and price →

Where Specifiction places it

• AI Tax Software#23 of 327.5