Check a UK VAT number is authentic

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.

Source:HM Revenue & Customs | 05-01-2026
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Aitch
Aitch is the visionary founder and CEO of CIGMA Accounting Ltd, a boutique accounting and tax advisory firm with offices in Wimbledon and Farringdon, London. With over a decade of experience, Aitch has built a reputation for strategic tax planning, complex HMRC compliance resolution, and innovative AI-powered accounting workflows that help SMEs, landlords, and high-net-worth clients streamline their finances. His expertise spans corporation tax, inheritance tax planning, R&D tax credit claims, capital allowances, and international tax matters, making him a trusted advisor for clients seeking to minimise tax liabilities while staying fully compliant. Aitch is passionate about bridging traditional accounting principles with cutting-edge digital solutions, allowing businesses to operate efficiently and future-proof their financial systems. Through CIGMA, he aims to make accounting smarter, faster, and more human-centric - empowering clients to focus on growth while staying ahead of regulatory changes.