Check VAT number in UK

Every B2B business in Britain needs a reliable way to check a VAT number in the UK before approving invoices, onboarding suppliers, or issuing zero-rated sales. A quick HMRC lookup confirms whether a GB VAT number is real, active, and registered to the company you think you are dealing with — free, online, and done in seconds.

Why check a UK VAT number?

Invoice fraud remains one of the most common threats facing finance teams. Criminals send professional-looking paperwork with VAT numbers that are inactive, cancelled, or registered to a completely different entity. EU and UK tax rules also expect reasonable due diligence before zero-rating cross-border B2B supplies. A live UK VAT number check creates a dated record that you consulted official HMRC data — not just trusted the number printed on a PDF.

Read why you should verify VAT numbers before every B2B transaction for a fuller picture of the compliance and fraud risks involved.

UK VAT number format before you check

Before you run a check VAT number UK online, confirm the format looks right. Most registrations use GB followed by nine digits — for example GB116300129. Some VAT groups use 12 digits. Remove spaces and hyphens before searching. If the prefix is missing or the length is wrong, investigate before you pay. Our UK VAT numbers guide covers format rules and common errors on incoming invoices.

How to check a VAT number in the UK online

Since Brexit, GB numbers are validated through HMRC — not the EU VIES system. To check a UK VAT number, enter the full code including the GB prefix into a trusted online tool that queries HMRC live. You receive an instant valid or invalid status plus the registered business name and address on file.

Use our free UK VAT checker for official HMRC results with no account required. For step-by-step instructions, see how to verify a UK VAT number online or how VAT validation works. Wondering if a free option exists? Read is there a free service to validate a VAT number for UK businesses?

What an HMRC VAT check returns

A successful HMRC VAT check tells you whether the registration is currently active. When valid, you also get the company name and address HMRC holds — compare those details to your supplier or customer before releasing funds. If they do not match, contact the business directly. An invalid result means you should pause payment until the number is clarified.

When to run a UK VAT lookup

Build a check supplier VAT number UK step into accounts payable, supplier onboarding, and high-value invoice review. Run a validate GB VAT number lookup before the first payment to any new B2B partner, not after a problem surfaces. Country-specific tips for Ireland, Germany, and other EU states are in our FAQ. For EU suppliers, see EU VAT numbers explained or best free website for checking EU VAT IDs.

Check a UK VAT number free now

Whether you need a one-off verify VAT number UK lookup or a regular compliance workflow, the process takes seconds. Visit the Check VAT Number homepage, enter the full GB number, and get instant HMRC results. For more UK guides, read how can I verify a VAT number online in the UK? or browse our blog.