Check UK VAT Number: How to Verify VAT Registration with HMRC

To check UK VAT number details, enter the nine-digit VAT registration number into HMRC’s official online checker. The free service confirms whether the number is valid and displays the registered business name and address, helping you verify supplier or customer details before relying on them for VAT purposes.

You can check a VAT number using HMRC’s free online UK VAT number checker.

The service lets you confirm:

• whether a UK VAT registration number is valid;
• the name of the business registered to that VAT number; and
• the registered business address.

UK VAT-registered businesses can also obtain a reference number showing when they checked the VAT number, which can provide useful evidence that appropriate checks were carried out.

You will need the VAT registration number itself. HMRC’s service does not let you search for a VAT number using only a company name.

How to Check UK VAT Number Details Using HMRC

To check UK VAT number details, use HMRC’s official GOV.UK VAT checker.

The process is straightforward:

1. Get the VAT registration number from the supplier or customer.
2. Open HMRC’s Check a UK VAT Number service.
3. Enter the VAT number.
4. Review whether the number is shown as valid.
5. Check that the business name and address match the organisation you are dealing with.
6. If you are VAT registered, create evidence of the check where appropriate.

For a UK VAT number check, you do not need to register for an account simply to verify another business’s VAT number. However, if your own business is UK VAT registered and you want a reference confirming when the check was carried out, you will need to provide your own VAT registration number.

What Information Does the VAT Number Check Show?

A successful VAT number check can confirm:

• whether the VAT registration number is valid;
• the registered business name; and
• the address associated with the VAT registration.

This can help businesses check that the VAT number shown on an invoice belongs to the organisation they expect.

What Does a Successful UK VAT Number Check Confirm?

A successful VAT number check in the UK confirms registration details, but it does not independently establish that an invoice is genuine, a transaction took place or input VAT is recoverable. Those matters require separate checks.

What Does a UK VAT Number Look Like?

Standard UK VAT registration numbers generally contain nine digits.

You may also see UK-related VAT numbers used in particular Northern Ireland transactions under the Northern Ireland Protocol.

The format of a number alone is not enough to prove that it is valid.

Can You Check a British VAT Number Using Its Format?

A business wanting to check a British VAT number should use HMRC’s official validation service rather than relying on the number of digits alone. Standard UK VAT registration numbers contain nine digits, but a correctly formatted number is not necessarily an active or genuine registration.

For example, a number may pass a basic format check but belong to another business. HMRC verification helps identify the registered business details and determine whether further investigation is needed.

A number can appear to have the correct format but still:

• be invalid;
• no longer be active; or
• belong to a different business.

That is why businesses should use the official checker rather than relying only on the number format.

Can You Check a UK VAT Number by Company Name?

No.

HMRC’s Check VAT Number UK service requires you to enter the VAT registration number.

You cannot use the service to search by:

• company name;
• trading name;
• address; or
• Companies House number.

If you do not have the VAT number, check the supplier’s:

• VAT invoice;
• receipt;
• website;
• contract; or
• other business documentation.

HMRC notes that VAT numbers for many businesses can be found on invoices, receipts or websites. If you only have a company name, you must first obtain its VAT registration number before using HMRC’s checker. A Companies House registration number cannot be used as a substitute.

Once you have the VAT number, you can verify the registered business details using the official service.

Can You Get Proof That You Checked a VAT Number?

Yes.

If your own business is UK VAT registered, HMRC allows you to obtain evidence showing that you checked another UK VAT number at a particular time.

The HMRC VAT checker can provide a reference number for a verified check.

HMRC’s VAT Number API similarly allows verified checks to generate a reference number proving that the validation took place.

Keeping evidence of important supplier checks can be useful as part of a business’s VAT records and wider due-diligence procedures.

Why Should Businesses Check VAT Numbers?

A vat number check can help identify problems before a VAT return is submitted.

For example, it can help establish whether:

• a supplier is VAT registered;
• the VAT number belongs to the expected business;
• information on an invoice appears consistent; and
• further questions should be raised before input VAT is claimed.

This can be particularly important where the amount of VAT involved is significant or where a business is dealing with a new supplier.

A VAT number check does not prove that every transaction is genuine, but it can form part of reasonable business checks.

VAT-registered businesses reviewing their wider compliance position may also want to check their eligibility for the VAT Flat Rate Scheme, particularly where simplifying VAT accounting could be relevant.

Can a VAT Number Check Help With Input VAT Claims?

Potentially.

To claim input VAT, businesses generally need appropriate evidence supporting the VAT incurred.

Checking the supplier’s VAT registration number can help demonstrate that the business took steps to verify the supplier’s VAT status.

However, a valid VAT number does not automatically make every VAT charge correct.

Businesses should still check:

• whether the invoice meets VAT requirements;
• whether the supply was genuinely made;
• whether the VAT rate is correct;
• whether the expenditure relates to the business; and
• whether input VAT is recoverable under the normal rules.

Keeping the HMRC check reference can provide additional evidence of when the VAT number was verified.

Is a Valid VAT Number Enough to Reclaim VAT?

No. A valid VAT registration number is only one part of checking whether input VAT is recoverable.

Before including VAT from a supplier invoice in a return, a business should ensure that it has appropriate supporting evidence, that the supply qualifies under VAT rules and that the amount claimed is correct.

Checking the UK VAT number helps establish the supplier’s registration status, but it does not replace invoice verification or the normal input VAT recovery conditions.

What If the VAT Number Shows as Invalid?

If HMRC’s checker shows a VAT number as invalid, do not immediately assume fraud.

Possible explanations can include:

• the number has been entered incorrectly;
• the supplier has recently registered for VAT;
• HMRC’s records have not yet updated;
• the VAT registration has been cancelled; or
• the number provided is incorrect.

HMRC acknowledges that newly issued VAT registration numbers may sometimes take time to appear in its online service and that there can occasionally be service issues affecting validation.

Check the number carefully and ask the supplier to confirm it. If doubts remain, additional checks may be appropriate before paying VAT or claiming it as input tax.

What Do Different UK VAT Number Check Results Mean?

If a VAT number check UK search leads to an invalid result, it does not automatically establish that the supplier is fraudulent. HMRC acknowledges that some valid registrations may not be recognised by its online service and that certain traders with non-UK addresses may display an HMRC address.

What If the Business Name Does Not Match the Supplier?

A valid VAT number belonging to a different business should be investigated.

Possible explanations include:

• a group VAT registration;
• a business trading under a different name;
• outdated invoice information;
• a change in business structure; or
• an incorrect VAT number.

Do not simply change the number yourself.

Ask the supplier to explain the discrepancy and provide supporting information where necessary.

Why Does the VAT Checker Show an HMRC Address?

There is a specific known issue involving some UK VAT-registered businesses with addresses outside the UK.

HMRC says that where a UK VAT-registered trader has a non-UK address, its VAT checker may display an HMRC address instead.

This does not mean the VAT registration is invalid.

HMRC states that the trader can provide its VAT certificate as evidence of its principal place of business if required.

How Do I Check an EU VAT Number?

UK businesses checking a VAT registration issued by an EU member state can use the European Commission’s VAT Information Exchange System (VIES).

VIES allows users to verify whether a business is VAT registered in an EU member state.

This is different from HMRC’s UK VAT checker.

Use:

• HMRC’s checker for standard UK VAT registration numbers; and
• VIES for VAT numbers issued by EU member states.

For VAT numbers issued by EU member states, businesses can use the European Commission VIES VAT validation service to confirm whether the number is valid for EU VAT purposes.

Can VIES Check UK VAT Numbers?

For most Great Britain VAT registrations, HMRC’s UK service is the appropriate checker.

However, HMRC guidance says VIES can also be used in certain circumstances to check whether a UK VAT-registered business is trading under the terms of the Northern Ireland Protocol.

This is relevant where Northern Ireland businesses participate in certain EU VAT arrangements for goods.

Is a VAT Number the Same as a Company Number?

No.

A VAT registration number and a Companies House company number serve different purposes.

A VAT number identifies a business registered for VAT with HMRC.

A company number identifies a company incorporated at Companies House.

A business can therefore have both numbers, and they should not be used interchangeably.

Businesses that are not yet VAT registered should also monitor whether turnover is approaching the VAT registration threshold, as registration obligations are separate from Companies House incorporation.

Is a VAT Number the Same as an EORI Number?

No.

An EORI number is primarily used for customs purposes when moving goods internationally.

A VAT registration number identifies a business for VAT.

For UK businesses, an EORI number may contain or relate to the business’s VAT number, but they remain separate identifiers with different purposes.

HMRC provides a separate online service for checking GB EORI numbers.

When Should You Check a Supplier’s VAT Number?

Businesses may want to check a VAT number when:

• dealing with a new supplier;
• receiving a VAT invoice for a significant amount;
• supplier details have changed;
• an invoice looks unusual;
• the VAT number differs from earlier invoices;
• preparing to reclaim significant input VAT; or
• carrying out supplier due diligence.

For regular suppliers, businesses may also decide to periodically repeat checks as part of their internal controls.

Keep Evidence of Important VAT Checks

Checking a supplier’s VAT number takes only a few moments but can form part of stronger VAT compliance.

For higher-risk or high-value transactions, businesses should consider keeping:

• the supplier invoice;
• the VAT registration number;
• the HMRC validation result;
• the reference number showing when the check was performed; and
• any correspondence resolving discrepancies.

Good VAT records can make it easier to explain the basis of an input tax claim if HMRC later asks questions.

For businesses regularly verifying supplier VAT details, keeping a consistent record of checks can help identify discrepancies and support internal compliance procedures. Where HMRC provides a verification reference, retain it alongside the relevant invoice and any correspondence explaining differences in the registered details.

CASE STUDY: Helping a Business Verify a Supplier VAT Number Before Reclaiming Input Tax

A growing business based near our Farringdon office contacted CIGMA Accounting after receiving a high-value supplier invoice that included VAT. The supplier was new, and the finance team noticed that the VAT number on the invoice did not match the details they expected from earlier correspondence.

Before including the VAT in the next return, we advised the business to use HMRC’s official UK VAT number checker to confirm whether the registration number was valid and whether the registered business name and address matched the supplier.

The VAT number itself was valid, but the registered name differed from the trading name shown on the invoice. CIGMA Accounting helped the client review the discrepancy, obtain supporting information from the supplier and confirm that the difference arose from the supplier trading under a separate business name.

We also recommended keeping evidence of the VAT check, including the HMRC validation result, supplier invoice and related correspondence, as part of the company’s VAT records.

The review highlighted an important point: a valid VAT number does not automatically confirm that every VAT charge is correct. The invoice still needed to meet VAT requirements, the supply needed to be genuine, and the input tax had to be recoverable under the normal rules.

The business subsequently introduced VAT-number checks for new and higher-risk suppliers as part of its wider VAT control procedures.

The client left with a clearer understanding of their position, options, and next steps.