Step 2 of 4 · ProjectsBy jurisdiction

13 open source tax projects for Norway.

Every project on the list for Norway, 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.

13 projects12 maintained12 on the map5 jurisdictions + globalFacts checked 6 Oct 2026

Browse these by tax area

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

Tax engines

1 project

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

Skatteetaten trekktabellJava routine from the Norwegian Tax Administration that computes withholding tax from the tax tables.Tax engineNOLicence unknown

MCP

1 project

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

mcp-skatteetatenMCP server for the Norwegian Tax Administration's APIs, with Maskinporten sign-in.MCPNOLicence unknown

APIs

10 projects

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

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

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

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

Skatteetaten mva-meldingenImplementation guide and validation material for the Norwegian VAT return (mva-melding) API.APINO

Skatteetaten SAF-TNorwegian SAF-T schemas, code lists and test files published by the Tax Administration.APINOLicence unknown

Skatteetaten skattemeldingenCode and specs for filing the Norwegian tax return: APIs, a validation service, XSDs and a Kotlin calculation.APINO

Skatteetaten suppleringsskattThe Norwegian Tax Administration's notes on GloBE Information Return filing: XML format, XSD check, test file.APINOLicence unknown

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

WencheFiles annual accounts, the shareholder register return and the tax return for Norwegian limited companies.APINO

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

Tax datasets

1 project

Rates, treaties and statistics, open and versioned.

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.

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.