For tax, law and notary firms
A knowledge base of 12,000 Dutch tax sources with citations, and five tools that fill in your tax procedures. EU-only infrastructure, client data is never stored.
§ 01 / Offering
Search roughly 12,000 Dutch tax sources: legislation, case law, decrees, tax authority position papers and rulings. Every answer comes with a footnote to the source, also usable as an MCP connector in Claude.
Go to the knowledge base →Five Dutch tax procedures that take over the form-filling, from the 30% ruling to the RGS bridge file. Same input, same output, every time.
See the tools →§ 02 / Knowledge base
In the portal, you chat with the knowledge base the way you would ask a colleague to look something up. No invented citations: only sources the knowledge base itself returns.
Knowledge base · sample citation
“…a subsidiary qualifies for the participation exemption once the interest reaches at least 5% of the paid-up nominal capital.1”
1. art. 13(2) Wet Vpb 1969
The same knowledge base also works as an MCP connector in Claude, alongside the portal chat and the API.
Go to the knowledge base →§ 03 / Tools
The application for the expat scheme, plus the cover letter. Employer and employee details in once, the tool returns the request in the official Dutch tax format.
For expats who would rather file it themselves, there is the self-service at dutch30percentruling.com.
How the 30% ruling works →The request to form a corporate income tax unity between a parent and its subsidiaries. Data in, the Part A and Part B forms out, ready to sign.
How the fiscal unity works →The request to form a VAT fiscal unity between intertwined entities (art. 7(4) Wet OB), including a reasoned verwevenheid motivation, ready to check and send.
How the VAT fiscal unity works →Qualification of hybrid mismatches under ATAD2. Describe the structure and the payment flows, the tool identifies the article, the neutralisation rule, and the tax consequence.
Go to the ATAD2 tool →Upload the annual accounts or trial balance and get back an RGS bridge file for Nextens or AFAS, mapped to RGS 3.5 with review points for the advisor.
First file free per firm. Try the bridge tool free →
Not sure which type fits your practice? Compare full filing suites, general AI, and specialist procedure tools in the honest comparison.
§ 04 / EU & Privacy
Confidentiality and the GDPR
Documents and client facts you put into a Lowkey tool are processed to produce your result, then discarded: we keep a billing line, never the contents. Hosting, AI reading, the database, and document processing all run in EU regions, and the firm stays the controller, Lowkey acts as your processor.
EU compute§ 05 / Questions
A searchable corpus of roughly 12,000 Dutch tax sources: legislation, case law, decrees, tax authority position papers, rulings and parliamentary history. You use it through portal chat, an MCP connector in Claude, or the API, and every answer comes with a footnote to the source.
The knowledge base starts at € 30 per month excl. VAT for one active user, with a 14-day free trial and no credit card required. The tools cost € 39 per finished document, except the RGS bridge file: the first file is free, then € 5 per file.
No. Uploads are processed in memory to produce your result and then discarded. We keep one billing line per finished document, never the contents. Everything runs on EU infrastructure.
No. The tools fill in forms and draft the cover letter, and the knowledge base helps you look up sources. The firm checks and decides. The judgement and the responsibility stay with you.
SME tax, law and notary firms and expat specialists that regularly handle 30% rulings, fiscal unity requests, or ATAD2 hybrid-mismatch structures, or want to use the knowledge base for research.