How to check a VAT number for a company

Before you pay a new supplier, approve a B2B invoice, or onboard a trading partner, you need to confirm their VAT registration is genuine. Knowing how to check a VAT number for a company takes seconds and protects you from invoice fraud, mistaken identity, and compliance gaps — free, online, and without creating an account.

Step 1: Get the company's VAT number

Ask the supplier or customer for their VAT registration number and check it appears on their tax invoice, quote, or contract. A legitimate B2B company should provide it willingly. The number includes a two-letter country prefix — GB for the UK, IE for Ireland, DE for Germany, and so on — followed by digits or letters set by national rules. If the number is missing or the format looks wrong, treat that as a warning before you proceed with a company VAT number lookup.

Step 2: Run an official online check

Enter the full number including its country prefix on a tool that queries the official registry live. UK GB numbers are checked through HMRC; EU member states use the European Commission's VIES system. Use our free VAT checker for instant results covering both UK and EU companies — no login required.

For UK-specific steps, read how to verify a UK VAT number online. For Irish companies, see how to check a VAT number in Ireland. A broader walkthrough is in how VAT validation works.

Step 3: Match the registered company name

A valid verify business VAT number lookup returns the registered company name and address as held by the tax authority — not what appeared on an email or purchase order. Compare those details to the legal entity on your contract and invoice. If the names do not align, contact the company through a trusted channel before releasing funds. This step is the core reason to check a company VAT number rather than trusting the PDF alone.

Step 4: Record the result

Save a dated note of the VAT number checked, the valid or invalid status, and the registered name returned. Finance teams and accountants use this evidence to show due diligence during audits. Build a supplier VAT number check into onboarding and accounts payable so every new B2B partner is verified before the first payment. See why you should verify VAT numbers before every B2B transaction.

What if the company VAT number is invalid?

Do not pay until the number is clarified. Recheck for typos, contact the supplier, and run the lookup again. If the result stays invalid, follow our guide on what to do if a VAT number is invalid. Format and prefix rules for UK companies are in UK VAT numbers; EU rules are in EU VAT numbers explained.

When to check a company's VAT number

Run a validate company VAT number lookup when onboarding a new supplier, reviewing a high-value invoice, confirming a customer before a zero-rated B2B sale, or whenever invoice details look unusual. A check VAT number before payment habit costs seconds and prevents costly mistakes. More guides: how to check VAT registration number and our FAQ.

Check a company VAT number free now

Whether you need a one-off business VAT verification or a standard compliance workflow, the process is the same. Visit the Check VAT Number homepage, enter the full VAT number with its country prefix, and get instant HMRC or VIES results — or browse more articles on our blog.