Open Source Tax Software.
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A portfolio tracking, analytics, accounting and management application that protects your privacy
Programming language for literate programming law specification
Handle all the hard stuff related to EU MOSS tax/vat regulations, the way it should be.
Crypto-currency tax calculator with support for all popular wallets, exchanges, explorers and migration from other crypto tax platforms
Privacy-focused, free, open-source cryptocurrency tax calculator for multiple countries: it handles multiple coins/exchanges and computes long/short-term capital gains, cost bases, in/out lot relationships/fractioning, and account balances. It supports FIFO, LIFO, HIFO and it outputs in form 8949 format. It has a programmable plugin architecture
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.
French tax and benefit system for OpenFisca
USA Federal Individual Income and Payroll Tax Microsimulation Model
Component using the European Commission (EC) VAT Information Exchange System (VIES) to verify and validate VAT registration numbers in the EU, using PHP and Composer.
Simple, yet powerful compliance solutions for Indian businesses
Calculate UK capital gains from broker exports — supports Charles Schwab, Freetrade, Hargreaves Lansdown, Interactive Brokers, Morgan Stanley, Sharesight, Trading 212, Vanguard and a custom RAW format.
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.
The deterministic tax engine for AI agents. Highest score ever recorded on TaxCalcBench (96% exact returns)
AI-powered bookkeeping and tax filing automation via MCP for entrepreneurs at the heart of the European economy
An open-source static tax-benefit microsimulation model for the UK.
Liste des plateformes pour la déclaration d'actifs numériques sur impots.gouv.fr via le formulaire n°3916-bis (french only)
Aotearoa New Zealand legislation as code
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