EU VAT guide
VAT number format check
A VAT number format check helps spot typos quickly, but it is only the first step before a live VIES validation.
A VAT number format check helps spot typos quickly, but it is only the first step before a live VIES validation.
What it catches
Format checks can catch missing digits, wrong country prefixes, unsupported letters, and obvious copy-paste errors.
They cannot prove that a business is registered, active, or eligible for a specific VAT treatment.
When VIES is still needed
Use VIES when you need the current validation response for an EU VAT number.
Keep the format result separate from the live VIES result in any audit trail or customer review queue.
Validating VAT numbers at volume?
Join the batch/API list for CSV validation, retries, audit exports, and developer access.
Related VIES guides
- VIES VAT number validation: name and address resultsVIES VAT number validation may return a company's registered name and address. Learn why fields can be blank and how to read the result.
- Batch VAT validationHow batch EU VAT validation should handle VIES retries, evidence, and privacy.
- VAT validation for invoicesWhen to validate VAT numbers before issuing cross-border EU invoices.
- 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 checkerCheck XI VAT numbers and understand Northern Ireland VAT validation in VIES.