How VAT validation works

A VAT number is a unique tax identification code assigned to businesses registered for Value Added Tax. In Europe and the UK, companies use it on invoices and tax filings. Before you pay a new supplier or apply zero-rate VAT on a cross-border sale, checking that their VAT number is real and active helps you avoid fraud and stay compliant.

What is a VAT number?

Every VAT-registered business receives a number that usually starts with a two-letter country code followed by digits or letters — for example GB116300129 for the UK or DE123456789 for Germany. The country prefix tells you which tax authority holds the registration record. If the format looks wrong or the prefix does not match the company’s location, that is an early warning sign.

How validation works on this site

When you enter a VAT number on Check VAT Number, we send a live request to the official registry for that country. For EU member states, we use the European Commission’s VIES (VAT Information Exchange System), which connects to national tax databases across all 27 EU countries. For United Kingdom numbers starting with GB, we query HMRC directly, because UK VAT numbers are no longer checked through VIES after Brexit.

What you see in the results

A successful check returns whether the number is currently valid or invalid. When valid, you also receive the registered business name and address as held by the tax authority — not what the company typed on a form, but what the government has on file. This lets you confirm you are dealing with the right legal entity before you send money or issue an invoice.

Why it matters for everyday business

Fake or inactive VAT numbers appear in invoice fraud, where criminals pose as legitimate suppliers. EU and UK rules also expect you to verify a customer’s VAT status before zero-rating B2B cross-border supplies. A quick lookup takes seconds and creates a record that you performed basic due diligence. It does not replace professional tax advice, but it gives you a solid starting point.

Try it yourself

Enter any VAT number with its country prefix on our free checker. No account is required. For deeper guides, read EU VAT numbers explained, UK VAT numbers, or our FAQ.