Knowledge base

Practical guides on the Belgian withholding obligation.

practical·9/22/2026·7 min read

Check a Belgian VAT number: making sure a supplier really exists

A VAT number on an invoice proves nothing until you check it. Here is how to verify a Belgian or European number, which sources are official and what still needs checking.

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nsso·9/1/2026·7 min read

How to find your supplier's NSSO number: a guide for clients

Finding your supplier's NSSO number is the first step of every withholding obligation check. Here are the four most reliable ways, plus the pitfalls to avoid.

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