Open Source Tax Software.

Rust bindings and SDK for the ELSTER Rich Client (ERiC)

Beancount plugin for generating informational UK tax report (calculate capital gains tax)

Java library helping you to handle ZUGFeRD invoices

MCP server for AI invoicing — Create invoices, track expenses & generate tax reports with Claude, Cursor & any MCP-compatible AI assistant

ATO Rulings & Guidance — Australian Tax Law, Structured for AI 67,000+ Australian Taxation Office documents as RAG-ready NDJSON/CSV — Edited Private Advice, public rulings and determinations, ATO Interpretative Decisions, practical compliance guidelines, taxpayer alerts, decision impact statements, practice statements and legislative instruments. Every document parsed into structured, typed fields for legal RAG, LLM fine-tuning, and tax research automation. Machine-readable… See the full description on the dataset page: https://huggingface.co/datasets/simplelex/ATO-Australian-Tax-Rulings-and-Guidance.

Official Model Context Protocol (MCP) server for vatnode — EU VAT validation, rates, and format checks for AI agents (Claude, Cursor, ChatGPT).

MCP server for AgentTax — tax compliance tools for AI agents

VAT ID validateion MCP server using https://ec.europa.eu/taxation_customs/vies/

FacturaHub plugin for Claude Code — Run your business from Claude. 46 MCP tools for invoicing, expenses, tasks, reports and e-invoicing.