8 open source tax projects for Switzerland.

Every project on the list for Switzerland, 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.

8 projects8 maintained4 on the map20 jurisdictions + globalFacts checked 6 Oct 2026

Browse these by tax area

Income tax Corporate tax Payroll tax VAT & indirect Cross-cutting

Calculators

2 projects

Small tools that compute one tax for one country.

Grenzgaenger-RechnerReact calculator for cross-border workers between St. Gallen and Austria: source tax and social insurance.CalculatorAT · CHFor individual taxpayers

swisstaxcalculatorSwiss income, wealth and pension-withdrawal tax for all cantons, as a Nuxt app with a REST API.CalculatorCHFor individual taxpayers

MCP

1 project

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

openswissdataMCP server and signed datasets of the Swiss customs tariff (TARES), FINMA lists and NOGA crosswalks; hosted.MCPCHNeeds a paid serviceLicence unknown

APIs

2 projects

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

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

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

Automations

1 project

Reusable workflows for provisions, reconciliations and compliance runs.

aeoiPre-alpha toolkit that builds and validates CRS XML 2.0 and 3.0, with typed CARF models and Swiss packaging.AutomationGlobal · CHDemo

Tax datasets

2 projects

Rates, treaties and statistics, open and versioned.

myTransferPricing referenceSummaries of 18 OECD transfer pricing country profiles, with a prompt that reviews a Local File against one.Tax datasetAT · BE · BR · DK · FR · DE · GR · IE · IT · LU · NL · PL · SG · ES · SE · CH · UK · US

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

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.

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