EU VAT guide
VAT validation for invoices
Businesses often validate EU VAT numbers before issuing or approving cross-border B2B invoices.
Businesses often validate EU VAT numbers before issuing or approving cross-border B2B invoices.
Before invoicing
Check the VAT number, review whether the customer details match, and keep evidence according to your internal process.
A valid VIES response is one input into invoicing decisions; it is not a substitute for professional VAT advice.
When validation fails
Ask the customer to confirm the exact VAT ID and whether it is activated for intra-EU transactions.
If VIES is unavailable, retry later instead of treating the VAT number as definitively invalid.
Validating VAT numbers at volume?
Join the batch/API list for CSV validation, retries, audit exports, and developer access.
Related VIES guides
- Reverse charge VAT number checkUse VIES as part of a reverse-charge VAT number check workflow.
- Keep VIES validation recordsWhy finance teams keep evidence of EU VAT number validations.
- XI VAT number checkCheck XI VAT numbers and understand Northern Ireland VAT validation in VIES.
- Greece EL VAT numberWhy Greek VAT numbers use EL in VIES and how to enter them correctly.
- VIES not workingTroubleshoot VIES not working, unavailable member states, and failed VAT checks.
- UK VAT number checkWhy a GB VAT number returns nothing in VIES, how XI differs, and where a UK VAT registration is actually checked.