Find a Business VAT Number UK: How to Use the HMRC VAT Number Checker

Find a Business VAT Number UK using the HMRC VAT number checker to verify whether a business is registered for VAT. A UK VAT number is usually a unique 9-digit number issued by HMRC to VAT-registered businesses. Checking a VAT number can help you verify suppliers, confirm VAT registration, and reduce the risk of VAT fraud.

A UK VAT number is important because businesses may need it to issue VAT-compliant invoices, reclaim eligible input VAT, and maintain accurate VAT records.

What Does a UK VAT Number Look Like?

A UK VAT number is usually nine digits long, although you may see it in different formats.

Common formats include:

123456789
GB123456789
GB123456789001 (branch registration)
XI123456789 (Northern Ireland businesses trading with the EU)

A VAT number is different from a Companies House registration number (CRN), which identifies a company but is not used for VAT purposes.

Method 1: Check Invoices and Business Documents

The easiest place to find a business VAT number is on its official documents.

A VAT-registered business usually includes its VAT number on:

VAT invoices.
Receipts.
Credit notes.
Pro forma invoices.
Quotations.

Look for labels such as:

VAT Registration Number
VAT Reg No
VAT No

The number is normally shown in the invoice header or footer.

Method 2: Check the Business Website

Many UK businesses display their VAT registration number on their website.

Common locations include:

Website footer.
About Us page.
Contact page.
Terms and Conditions.
Privacy Policy.
Checkout or order confirmation pages.

If a business claims to be VAT registered but does not display its VAT number anywhere, it is worth checking further.

Method 3: Use HMRC’s Official VAT Number Checker

HMRC offers a free online service that lets anyone verify a UK VAT number.

To check a VAT number:

Step 1: Visit the HMRC VAT number checker.

Step 2: Enter the 9-digit VAT number with or without the GB prefix.

Step 3: Review the result.

The checker will show:

Valid VAT number.
Invalid VAT number.
No match found.

If you are VAT registered, you can also create proof of your VAT verification for your records.

Method 4: Contact the HMRC VAT Helpline

If you cannot use the online service, you can contact HMRC by phone.

VAT Helpline

Phone: 0300 200 3700

Opening Hours:

Monday to Friday

8:00 am to 6:00 pm

You should have the company’s name and postcode ready before calling.

HMRC can normally confirm whether a VAT number is valid.

Method 5: Use the EU VIES System

If you trade with businesses in the European Union, you can verify VAT numbers using the VAT Information Exchange System (VIES).

The VIES system:

Verifies VAT numbers from EU member states.
Supports Northern Ireland XI VAT numbers.
Does not verify standard UK GB VAT numbers.

Simply enter the country code and VAT number to check whether it is valid.

Method 6: Find Your Own VAT Number

If you need your own VAT number, you can find it in several places.

These include:

Your VAT Registration Certificate.
Your HMRC Business Tax Account.
Previous VAT returns.
HMRC VAT correspondence.
Your accounting software.
Your accountant or tax adviser.

What Should You Do if a VAT Number Is Invalid?

If a VAT number cannot be verified:

Step 1: Contact the supplier and request the correct VAT number.

Step 2: Check for typing errors.

Step 3: Do not pay the VAT amount until the VAT number has been confirmed.

Step 4: Report suspected VAT fraud to HMRC if necessary.

Step 5: Seek professional advice if you are unsure about your VAT obligations.

VAT Number Fraud: Warning Signs to Watch For

VAT fraud can be expensive for businesses.

Common warning signs include:

The VAT number fails HMRC verification.
Business details do not match HMRC records.
Prices are significantly lower than market value.
The supplier refuses to provide a VAT number.
VAT invoices appear incomplete or incorrect.
High-value goods are sold unusually cheaply.

Always verify a new supplier before claiming VAT.

VAT Registration Threshold in the UK

Not every UK business must register for VAT.

For the 2025/26 tax year, businesses normally need to register when their taxable turnover exceeds £90,000 over any rolling 12-month period.

Businesses below this threshold may choose to register voluntarily.

If a business is not VAT registered, it should not charge VAT.

Can Anyone Search for a UK VAT Number?

Yes.

Anyone can use HMRC’s free VAT number checker to verify whether a UK VAT number is valid and confirm the registered business details.

Is a Company Number the Same as a VAT Number?

No.

A Company Registration Number (CRN) is issued by Companies House when a company is incorporated.

A VAT number is issued separately by HMRC when a business registers for VAT.

Both numbers serve different legal purposes.

What If a Business Charges VAT Without a VAT Number?

If a business charges VAT but cannot provide a valid VAT registration number:

Do not pay the VAT element until it is verified.
Request a corrected VAT invoice.
Report suspected fraud to HMRC if appropriate.

Without a valid VAT number, you cannot normally reclaim VAT.

How Often Should You Verify a Supplier’s VAT Number?

It is good practice to verify a supplier’s VAT number:

Before working with a new supplier.
At least once every year.
Whenever the supplier changes its business details.
Before making large or high-value purchases.

Regular checks help reduce VAT compliance risks and protect your business from fraud.

Find a Business VAT Number UK: Easy HMRC Verification Guide (2026)