Open Source Tax Software.
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Create and import e-invoices with ERPNext.
PHP API client that allows you to interact with the KSEF API Krajowy System e-Faktur
Python library to compute US federal taxes, and state taxes for some states.
An overlapping generations model framework for evaluating fiscal policies.
Fatturazione Elettronica Italiana
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.
Liste des plateformes pour la déclaration d'actifs numériques sur impots.gouv.fr via le formulaire n°3916-bis (french only)
Libreoffice Extension to generate PDF Factur-X invoices with Libreoffice Calc
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
Rust bindings and SDK for the ELSTER Rich Client (ERiC)
Paquete Laravel para gestión y registro de facturación electrónica VeriFactu. Compatible con Laravel 10 a 12.x
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.
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