Open Source Tax Software.
Every project is a real public repository, with stats refreshed from the source. Members can review projects, and maintainers can verify ownership of their pages.
Self-hosted AI accounting app. LLM analyzer for receipts, invoices, transactions with custom prompts and categories
Programming language for literate programming law specification
Open-source Tax Guides for AI agents, reviewed by named CPAs/CAs/EAs. 1,000+ Guides across 190+ jurisdictions. MCP server included. Works with Claude, ChatGPT, Cursor.
USA Federal Individual Income and Payroll Tax Microsimulation Model
French tax and benefit system for OpenFisca
Servidor MCP fiscal brasileiro: CNPJ, NF-e, NFS-e, CT-e, SPED, eSocial, Simples Nacional, Reforma 2026. 44 tools, zero-cadastro, tabelas offline. Python.
OpenFisca core engine. See other repositories for countries-specific code & data.
The PolicyEngine US Python package contains a rules engine of the US tax-benefit system, and microdata generation for microsimulation analysis.
AI-powered bookkeeping and tax filing automation for entrepreneurs at the heart of the European economy
An open-source static tax-benefit microsimulation model for the UK.
Fully open-source US federal tax engine. Single binary cli. Runs on macOS, Linux, and Windows. Built for AI agents using AI agents.
Aotearoa New Zealand legislation as code
Tunisian tax and benefit system for OpenFisca
TAXSIM emulator using the PolicyEngine US federal and state tax calculator
Runloop's AI TaxMan Project: an agent development starter that uses Codex & W&B Weave to process tax forms. Watch YouTube series: https://youtu.be/an7OMH_i8DU
TaxEase.AI is a user-friendly AI assistant designed to demystify and simplify US tax filing, a system that has become needlessly convoluted and stressful for millions of Americans.
MCP server for French tax calculations and information - enables AI assistants to provide accurate French tax guidance
France-Data module of OpenFisca
MCP server for US individual taxpayers — 39 tools for federal/state tax calculations, credits, deductions, retirement strategies, and tax planning. All calculations run locally. TY2024 + TY2025 (OBBB Act).
Model Context Protocol (MCP) server for ELSTER (German tax portal). Submit UStVA, prepare EUER/ESt, sync inbox + history via Puppeteer.
Build one of these? Verify ownership through GitHub and take over your project's page: tagline, categories, maintainer's note.