Check a UK VAT number is authentic

tiemadmin • 8 January 2026

Verifying a VAT number before reclaiming VAT can protect your business from rejected claims, repayments, and unnecessary penalties.

The online service for checking a UK VAT number is available at www.gov.uk/check-uk-vat-number. This online tool allows businesses and individuals to verify the legitimacy of a UK VAT registration number, helping to ensure that the information provided by suppliers or customers is accurate and up to date.

By using the online service, users can confirm whether a VAT number is valid and view the registered business’s name and address, providing reassurance when entering into new commercial relationships.

In addition to basic verification, the service enables UK taxpayers to download an official certificate confirming that a VAT number was valid at a specific date and time. This certificate can be retained for audit records, offering valuable evidence in the event of future HMRC queries. Having accurate documentation is especially important when dealing with unfamiliar or newly established suppliers, where the risk of error or deliberate fraud can be higher.

Checking a VAT number can help avoid costly mistakes. If a VAT number is invalid and you have reclaimed input VAT on related purchases, HMRC may refuse the claim and can also seek repayment of VAT, potentially resulting in financial penalties.

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