Browse and search
Find legislation and decisions in the portal. Open the sources and check the relevant tax year.
Dutch tax sources, in one place.
Search Dutch tax legislation, case law and policy and open the official source behind every result.
Legislation, case law, decrees, tax authority position papers, rulings and parliamentary history, with links to the source.
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MCP & API
Connect the sources to your own tools. Any costs of an external AI service are separate.
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Ask questions and review the sources used in the answer. Chat is billed separately by usage and requires a saved payment card, including during a knowledge-base trial.
Where the sources come from
Every source in the knowledge base links to the official source.
| Source type | Official source |
|---|---|
| Legislation and decrees | wetten.overheid.nl |
| Case law (Supreme Court, courts of appeal, district courts, Advocate-General opinions) and the CJEU | uitspraken.rechtspraak.nl and eur-lex.europa.eu |
| Tax authority position papers (kennisgroepstandpunten) | kennisgroepen.belastingdienst.nl |
| Rulings (APA/ATR summaries) | belastingdienst.nl |
| Parliamentary history | zoek.officielebekendmakingen.nl |
See an example first
The 100 tax topic pages on the site are built from the same sources. Each topic links to the statutes, case law and position papers it uses.
For your firm
Source citations
Every source with a link to the official source.
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Connect the knowledge base to your own tools via MCP or API.
Connection instructions →EU processing
Processing in the EU.
Data handling →Knowledge-base pricing
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Active users are people who made at least one call through the connector that month. All API keys of an account together count as one active user. Cancel monthly. The 14-day trial applies to knowledge-base access; AI chat is billed separately. Access is free for verified EU higher-education addresses for personal, non-commercial use.
Sources and data
Source references help you check an answer; they do not replace your assessment of its accuracy or relevance. Processing is in the EU. Chat history and file-review documents remain until your firm deletes them.
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