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
I'm Aitch, the Founder and CEO of CIGMA Accounting Ltd. As a Chartered Management Accountant and as a CIMA member, I've spent more than 16 years helping businesses, entrepreneurs, landlords, and individuals with tax planning, accounting, and HMRC compliance. As a chartered accountant in London, I'm passionate about making complex tax matters easier to understand and helping clients make confident financial decisions. Over the years, I've advised start-ups, SMEs, established companies, and high-net-worth individuals across a wide range of tax and accounting matters. My expertise includes Corporation Tax, Self-Assessment, Capital Gains Tax, Inheritance Tax planning, R&D tax relief, capital allowances, international tax, and resolving complex HMRC compliance issues. Whether clients need a business accountant, tax accountant, or strategic tax advisor, my focus is always on delivering practical advice that creates long-term value. One of my specialist areas is Making Tax Digital (MTD). I've worked extensively with businesses preparing HMRC's digital reporting requirements, helping them move to cloud accounting, improve financial processes, and adopt technology that makes compliance more efficient. I regularly speak at Making Tax Digital roadshows, industry events, and educational sessions in collaboration with Zoho Books, sharing practical insights into digital accounting, tax legislation, and the future of the profession. Many business owners looking for the best accounting firm in London are not simply searching for an accountant they're looking for trusted advice, responsive support, and long-term value. That's the approach I've taken in building CIGMA Accounting. My team and I work closely with businesses across London and the UK, providing accounting services, tax advisory, bookkeeping, payroll, VAT, company accounts, and strategic tax planning tailored to each client's goals. Through this website, I share practical guidance on UK taxation, Making Tax Digital, HMRC updates, Corporation Tax, Self-Assessment, and business finance. My aim is to provide reliable, straightforward information that helps business owners understand changing regulations, reduce compliance risks, and make informed financial decisions with confidence.