The shape of tax open source.
Twenty practice-grounded categories, from filing returns to serving tax rules over MCP. Every project carries one to four.
Full tax AI assistants, copilots, and workpaper workbenches.
Skill packs, plugins, and portable workflows for AI agents.
Model Context Protocol servers exposing tax data and tools.
Preparing and e-filing individual and business tax returns.
Indirect tax: rates, number validation, calculation, and returns.
Compliant invoices: Peppol, UBL, ZUGFeRD/Factur-X, and clearance.
Payroll taxes, social contributions, and withholding calculation.
Ledgers, ERPs, and bookkeeping tools with tax features built in.
Libraries and engines that compute tax, embeddable anywhere.
Tax law as executable code: statutes and benefit rules you can run.
Scrapers, APIs, and corpora of tax law, rulings, rates, and forms.
Models, pipelines, and applications for tax language.
Embeddings, retrieval pipelines, and RAG over tax corpora.
Regulatory filings and standards: SAF-T, CbC, DAC7, FATCA/CRS.
Cross-border taxation, treaties, and transfer pricing tooling.
Crypto tax, portfolio accounting, and capital gains calculators.
Tax-benefit microsimulation and policy analysis models.
AI that runs on your own machine. No cloud, no data leaving the building.
Evaluation suites and datasets for tax-domain systems.
Awesome lists and landscape maps of the tax tech ecosystem.