Step 2 of 4 · ProjectsBy jurisdiction

All projects By jurisdiction European Union

92 open source tax projects for the European Union.

Every project on the list for the European Union, grouped by kind. Global tools have a page of their own. Entries without a warning come first in each group; the labels mark what to check.

92 projects70 maintained56 on the map16 jurisdictions + globalFacts checked 6 Oct 2026

Browse these by tax area

Income tax Corporate tax Benefits VAT & indirect Cross-cutting

Tax engines

2 projects

Rules-as-code that compute liabilities, returns and reforms.

EUROMODThe EU tax-benefit microsimulation model, maintained by the Joint Research Centre.Tax engineEU

fiscalize (grunt-it)Engine for EU national e-invoicing and fiscal clearance on EN 16931 with country adapters; a Slovenian pilot.Tax engineSI · EUDemoLicence unknown

Calculators

1 project

Small tools that compute one tax for one country.

Inflop.VatSharp.NET library for EU VAT calculation under Directive 2006/112/EC with three calculation methods.CalculatorEU

MCP

4 projects

Open connectors and protocols between agents and legislation, case law and ledgers.

douanecode-mcpMCP server for HS, NC8 and TARIC code search through douanecode.fr; needs a Pro API key.MCPFR · EUNeeds a paid service

InvoiceXML MCPMCP server for the InvoiceXML API: Factur-X, ZUGFeRD, XRechnung, UBL, CII and Peppol BIS invoices.MCPEU · DE · FRNeeds a paid service

vatnode MCPMCP server to validate EU VAT numbers and look up VAT rates, with offline checks.MCPEUNeeds a paid service

vies-mcp-serverMCP server that validates EU VAT numbers through the VIES service.MCPEUInactive since 2025Licence unknown

APIs

55 projects

Validation, rates, filings and registries you can call directly.

BelgiumVatChecker.NET Web API that validates Belgian and EU VAT numbers using the VIES service.APIBE · EU

BrevJVM library to write and read Peppol BIS Billing 3.0 invoices and credit notes, with Norwegian identifiers.APINO · EU

cbam-apiGo API on the EU Carbon Border Adjustment Mechanism (CBAM) data model.APIEU

DomibusDomibus, the European Commission's open AS4 message handler for eDelivery, used for e-invoicing exchanges.APIEU

einvoicing (JavaScript)JavaScript library to create and parse EN 16931 e-invoices and popular extensions.APIEU

eInvoicing-EN16931Validation artefacts for EN 16931, the European e-invoicing standard.APIEU

ESJ (EN 16931 Semantic JSON)JSON binding of the EN 16931 invoice model, with a Java library, CLI, validation and UBL/CII conversion.APIEU · DE

eu-vat-evidence.NET library for EU VAT number validation and compliance evidence, in two NuGet packages.APIEU

factur-xPython library for Factur-X, the e-invoicing standard for France and Germany.APIEU · FR · DE

go-financeGo library with exchange rates, VAT number validation and IBAN/BIC conversion.APIEU

GOBLGo library and schemas for electronic business documents, especially invoices.APIGlobal · EU

hs-code-lookupJavaScript library that parses, validates and looks up HS codes with MFN duty rates for US, EU, UK and China.APIUS · EU · UK · CN

ibericode/vatPHP library for European VAT: rates, VAT number validation and country checks.APIEU

invoicesuitePHP library to create, read and validate XRechnung, ZUGFeRD and Factur-X e-invoices.APIDE · EU

kaltblutJava library for handling ZUGFeRD e-invoices.APIEU · DE

KoSIT validatorGermany's official validator engine for XML e-invoices: checks XSD and Schematron, then reports.APIDE · EU

mustangprojectJava library, validator and tool for e-invoices: Factur-X/ZUGFeRD, XRechnung and UN/CEFACT CII.APIEU · DE

NAV DCC-APISchemas and Java models of the Hungarian tax authority's DAC9 (GloBE return), DAC8 and CARF exchange API.APIHU · EU

Oxalis-NGOxalis Next Generation, open-source implementation of the OpenPeppol AS4 profile for access points.APIEU · NO

Peppol BIS Billing 3.0Specification and validation rules for Peppol BIS Billing 3.0 e-invoices, from OpenPeppol.APIEULicence unknown

peppol-billingTypeScript library that generates and parses Peppol BIS Billing 3.0 (UBL 2.1) invoices and credit notes.APIBE · EU

peppol-bis-billing-3-generatorJava code that generates Peppol BIS Billing 3 invoice XML.APINO · EU

peppol-toolkitTypeScript toolkit to generate and read Peppol UBL e-invoices.APIEU

phase4AS4 client and server library with built-in Peppol and CEF eDelivery support.APIEU · Global

phoss APphoss AP, an open-source Peppol Access Point server by the author of phase4 and phive.APIEU

phoss SMPphoss SMP, a Peppol and OASIS BDXR service metadata publisher server.APIEU

StampbenchTypeScript library and CLI to validate, repair and generate XRechnung and EN 16931 e-invoices.APIDE · EU

tax-idsRust crate that validates VAT and GST numbers in the EU, UK, Switzerland and Norway.APIEU · UK · CH · NO

ubl-peppolPHP library that builds UBL 2.1 e-invoices for Peppol BIS Billing 3.0.APIEU · NL · BE

valvatRuby gem that validates EU and UK VAT numbers, standalone or as an ActiveModel validator.APIEU · UK

vat (adaptive)Cloudflare Worker that validates EU VAT numbers via the VIES SOAP service and returns JSON.APIEU

vat-calculatorPHP library that applies EU VAT rates and MOSS rules and validates VAT numbers.APIEU

VATcomplyRust API server for VAT number validation, ECB exchange rates, VAT rates and IP geolocation.APIEU

VATValidationVAT number validator with GUI, CLI and REST API for German, EU, UK and Swiss checks.APIDE · EU · UK · CH

vies-checkerTypeScript validator for EU VAT numbers using the European Commission's VIES service.APIEU

vies-client (LGx0)Zero-dependency Java client for validating EU VAT numbers through the VIES REST API.APIEU

vies-dotnet.NET library that validates EU VAT numbers through the European Commission's VIES service.APIEU

XRechnung validator configurationThe official XRechnung and EN 16931 validation scenarios for the KoSIT validator.APIDE · EU

cakephp-vat-number-checkCakePHP plugin that normalises a VAT number and checks whether it is valid.APIEUInactive since 2019

checkvatScala library that checks whether an EU VAT number is valid, following the VIES specification.APIEUArchivedLicence unknown

e-invoice-tsTypeScript SDK for the e-invoice.be Peppol API: create and manage e-invoice documents from server code.APIEUNeeds a paid service

e-invoice-validator (easybill)Validation service for UBL and CII e-invoices against EN 16931, XRechnung, Peppol BIS and Factur-X rules.APIEU · DEInactive since 2025

einvoicing (PHP)PHP library to read and create EN 16931 European e-invoices as UBL; CII is on the roadmap.APIEUInactive since 2025

eori (PHP)PHP EORI number validator.APIEUInactive since 2024

Factur-X LibreOffice extensionLibreOffice Calc extension that generates Factur-X PDF invoices.APIEU · FR · DEArchived

hyperway.NET Core Peppol Access Point implementation, last changed in 2018.APIEUInactive since 2018Licence unknown

m2-vatfallbackMagento 2 module that validates VAT numbers by API, with an offline regex fallback for VIES outages.APIEU · UKArchived

NIP24 PHP clientPHP client for NIP24: validates Polish NIP, REGON and KRS numbers and EU VAT IDs.APIPL · EUNeeds a paid service

OxalisOxalis, the open-source Peppol Access Point originally built for the Norwegian government, now frozen.APIEU · NOArchived

peppol-bis-billing-validator (easybill)Docker service that validates XML invoices against the Peppol BIS Billing 3.0 schematron rules.APIEUInactive since 2024

Stanza VAT Validator (C#).NET client for a hosted EU and UK VAT number validator and rate lookup.APIEU · UKNeeds a paid service

vat (Danny van Kooten)Go package that validates EU VAT numbers and looks up VAT rates.APIEUInactive since 2023

viesPHP component that checks EU VAT numbers against the European Commission's VIES service.APIEUInactive since 2024

vies-vat-validation-php-sdk-restPHP SDK for validating VAT numbers through the European Commission's VIES REST service.APIEUInactive since 2023

vies-vat-validation-php-sdk-soapPHP SDK for validating VAT numbers through the European Commission's VIES SOAP service.APIEUInactive since 2023

Automations

19 projects

Reusable workflows for provisions, reconciliations and compliance runs.

dac7-validatorTypeScript validator for OECD DPI and EU DAC7 XML: schema checks, typed errors, a CLI and a Swedish TIN rule.AutomationEU

DocumentAnalyserAPIFastAPI service that validates CBAM spreadsheet rows: EORI numbers, CN codes, ISO country codes and dates.AutomationEU

eu_einvoice (ERPNext)ERPNext app that creates and imports UN/CEFACT CII e-invoices, including XRechnung.AutomationEU · DE

eu.idempiere.intrastatiDempiere plugin that generates per-country Intrastat XML declarations.AutomationEULicence unknown

OCA intrastat-extrastatOdoo modules for Intrastat declarations and product HS codes (product_harmonized_system).AutomationEU

OpenBooksEarly-stage accounting app with EU VAT logic, invoicing and Peppol export.AutomationEU · NL

trytond-customsTryton ERP customs module that adds customs duties based on tariff codes; version 8.2.0 released 5 Oct 2026.AutomationEU · Global

Zolltarif-Validator-JavaFXJavaFX tool that validates and categorises 8-digit German customs tariff numbers; distributed as a jar.AutomationDE · EULicence unknown

12_taxobservatoryScripts that gather, parse and visualise declared tax data from public country-by-country reports.AutomationEU · GlobalInactive since 2024Needs a paid service

aeoi (UEk)React and TypeScript MVP for handling AEOI DAC2 and CRS XML files; validation stubbed, a demo.AutomationEU · GlobalDemoLicence unknown

cbamtoolsNext.js CBAM cost calculator, HS checker and report preparation, in early development.AutomationEUDemoLicence unknown

eori-validatorValidates EU and GB EORI numbers against the EU customs and HMRC registries, as a Next.js app.AutomationEU · UKNeeds a paid serviceLicence unknown

FacturiaMulti-tenant e-invoicing demo that generates Peppol BIS 3.0 UBL invoices and checks EN 16931 rules.AutomationEUDemo

peppol-invoice-nextjs-starterNext.js starter that sends Peppol e-invoices through the getpeppr API, with webhook handling and sample UI.AutomationEUArchivedDemoNeeds a paid service

pfizer-tp-benchmarkStreamlit TNMM workpaper: tested party, rejection cascade, profit level indicators, range and Excel export.AutomationDE · EUDemoNeeds a paid service

roo-table-extractorExtracts rules-of-origin tables from an EU trade agreement PDF with pdfplumber; one commit.AutomationEUInactive since 2025Licence unknown

rules-of-origin-builder-xiScrapes rules-of-origin data for the Northern Ireland and EU tariff; archived.AutomationUK · EUArchivedLicence unknown

taric-geminiAI tariff classification prototype on EU TARIC data; the README documents only its storage layer.AutomationEU · DEDemoNeeds a paid serviceLicence unknown

transfer-pricing-intelligence-platformDjango app testing a royalty rate against an arm's length range, each jurisdiction's rule stated in a PDF.AutomationES · EU · DE · ITDemo

Tax datasets

10 projects

Rates, treaties and statistics, open and versioned.

apparel-hs-codesOpen JSON database of apparel and textile HS codes with MFN duty rates for the US, EU, UK and Australia.Tax datasetUS · EU · UK · AU

DeepCalc tax rate dataOpen tax rate data as JSON and an npm package: US federal income tax, EU VAT, US sales tax for 10 states.Tax datasetUS · EU

EU Tax DatasetEU VAT rates for all 27 member states, compiled from European Commission sources.Tax datasetEUPolyForm Internal Use 1.0.0

EU VAT Rates DataOfficial-source VAT rates for 45 European jurisdictions, machine-readable and checked daily.Tax datasetEU

taric-opendataAutomated mirrors of tariff data from 18 sources (EU TARIC, GB, NO, CH, US) plus EBTI and ATaR rulings.Tax datasetEU · UK · NO · CH · US · Global

us-tariff-dataUS HTS as CSV and JSON with Chapter 99 duties by country, and EU duties by origin; a vendor's data dump.Tax datasetUS · EU

vat-rates (ibericode)Community-maintained collection of EU VAT rates, as a JSON file.Tax datasetEU

Digital services VAT ratesMachine-readable VAT rates for digital services in EU member states and special territories.Tax datasetEUInactive since 2025

EU Tax Observatory tax deficit report (code and data)Input data, Stata do-files and output tables behind the EU Tax Observatory's 2021 tax deficit report.Tax datasetEU · GlobalInactive since 2021Licence unknown

Magento EU Tax RatesEU VAT rates as CSV files for import into Magento shops.Tax datasetEUInactive since 2025Licence unknown

Legal datasets

1 project

Statute, case law and guidance your agents can cite.

EUR-LexEU legislation and case law, with machine-readable open data.Legal datasetEU

Labels mark what to check before you rely on an entry: inactive or archived code, demos, paid services and unclear licences. Only maintained projects for companies and tax authorities appear on the map. Search and filter the whole list.

Missing a project? Add it to the list.

Submit a project

Next · Step 3 of 4The gapsThe activities with no open project yet, and the partly covered ones, with what to build on.