What is a UK VAT number?

A VAT registration number identifies a business that is registered for VAT in the United Kingdom. Businesses use this number when issuing VAT invoices, submitting VAT returns and carrying out transactions where VAT information is required.

Businesses may need to register for VAT when they meet the applicable registration criteria set by HM Revenue and Customs. Once registered, they must charge VAT where required, maintain appropriate records and submit VAT returns according to HMRC rules.

Why VAT validation matters

Checking a VAT number can help businesses confirm whether a company appears to be registered for VAT and whether the number format and registration information are consistent with the selected country.

VAT validation is useful when onboarding suppliers, verifying business customers, preparing invoices or confirming tax details before processing transactions.

Validate UK VAT numbers with TIN Check

TIN Check provides a simple way to validate VAT and tax identification numbers through the website or through API access for business workflows.

API access is useful for companies that need recurring validations inside billing, onboarding, compliance or accounting systems.