VAT and EU business guides

Practical guides about VAT numbers, VIES validation, invoicing, and cross-border business checks.

Guide

How to Check a VAT Number with VIES

Learn how VIES-based VAT checks work, what information to enter and how to interpret a valid or invalid result.

vat-validator.com Read more →
Guide

EU VAT Number Formats by Country: Prefixes and Checks

See why EU VAT number formats differ by country, how prefixes help identify a country and when to use a VIES check.

vat-validator.com Read more →
Guide

VAT Number Invalid or Not Valid? Causes and Next Steps

Find out why a VAT number may return an invalid result and what to check before rejecting an invoice or supplier.

vat-validator.com Read more →
Guide

What Is a VAT Number? EU VAT IDs Explained

Learn what an EU VAT number is, where it is used, how country formats differ and why checking it matters before invoicing.

vat-validator.com Read more →