Last Updated on AUG 21, 2026

Checking whether a company is VAT registered is an important step before accepting a VAT invoice, reclaiming input VAT or dealing with a new supplier.

In 2026, HMRC’s official Check a UK VAT Number service remains the main way to verify a UK VAT registration number.

It confirms whether the number is valid and, where available, shows the name and address of the business registered to it.

However, HMRC does not allow users to search the VAT register simply by entering a company name.

If the VAT number is unknown, it normally needs to be obtained from an invoice, receipt, the business itself or information published on its website before it can be checked through HMRC.

Why Is a VAT Number So Important for Businesses in the UK?

A VAT number is much more than a formal code issued by HMRC. It signifies that a business is recognised and authorised to collect VAT on behalf of the government. This identifier is unique to every VAT-registered business and is required for a range of financial and legal processes.

The UK VAT registration threshold remains £90,000 in 2026. A business generally has to register if its VAT-taxable turnover for the previous 12 months goes above £90,000, or if it expects its taxable turnover to exceed £90,000 within the next 30 days. Businesses below the threshold can also choose to register voluntarily.

The £90,000 figure therefore does not need changing. Only the outdated reference to “as of 2025” should be removed.

VAT numbers serve as proof that a business operates under regulated tax protocols. For clients and customers, seeing a VAT number builds credibility. It also ensures they can reclaim any VAT paid if they themselves are VAT registered.

Additionally, invoices issued without a valid VAT number are considered non-compliant for VAT recovery. If you claim back VAT on a transaction with an unverified or incorrect VAT number, it could lead to rejections or audits.

Once registered, a business must include its VAT registration number on the VAT invoices it issues. A VAT number may also appear on receipts or a business website, but the key statutory requirement relevant here is that VAT invoices contain the supplier’s VAT registration number.

Ultimately, a VAT number acts as a trust signal and a financial safeguard.

What Does a UK VAT Number Look Like and What Does It Signify?

A UK VAT number typically starts with the prefix “GB”, followed by nine digits. This sequence is unique to every registered business and helps HMRC track their VAT collection and payment history.

For example, a valid VAT number may look like GB123456789. This number is associated with a specific legal entity, and no two companies will have the same one.

Since the implementation of the Northern Ireland Protocol, VAT numbers in Northern Ireland may include the prefix “XI”, which is used specifically for transactions involving the EU. This format helps distinguish domestic and cross-border VAT activity.

The structure and details of a VAT number are essential for validating a business’s registration status.

VAT Number Format Overview

Region	Format Example	Purpose
UK (excluding NI)	GB123456789	Standard for UK-based businesses
Northern Ireland	XI123456789	Used for EU transactions under NI Protocol
EU Countries	Varies by country	Checked via the VIES platform

When you receive an invoice, always check that the VAT number matches the issuing business and corresponds to the official structure.

How to Check if a Company is VAT Registered?

The process of checking whether a company is VAT registered in the UK is straightforward. The main tool is HMRC’s VAT registration checker, which is a public service and available online.

Many individuals use it when they want to confirm a VAT number on an invoice or before entering into a commercial relationship. Businesses use it to ensure compliance when reclaiming input VAT or vetting suppliers.

HMRC’s checker requires the VAT registration number you want to verify. It can confirm whether a UK VAT number is valid and show the name and address of the business to which the number is registered.

A UK VAT-registered business can also enter its own VAT number when carrying out the check to obtain evidence showing when the VAT number was checked. Keeping this evidence can be useful as part of supplier due diligence and VAT records.

The service cannot be used to search for a business by name, and businesses waiting for HMRC to process their own VAT registration cannot use the checker to confirm a VAT number that has not yet been issued.

HMRC also warns that a VAT number may occasionally appear as invalid because of a service issue, so an unexpected result should be checked carefully before assuming the business is not VAT registered.

How Do You Use the HMRC VAT Number Checker Online?

The HMRC VAT number checker is one of the most reliable tools for verifying UK VAT registration. It is accessible, free to use, and updated directly by HMRC.

Steps to Use the HMRC Checker

1. Visit the HMRC VAT number checker website.
2. Input the VAT number you want to verify.
3. Review the results showing whether the number is valid.
4. If valid, the tool will also display the business name and address.
5. VAT-registered users can download proof of the check.

This service is also available in Welsh (Cymraeg), making it more accessible for businesses based in or operating from Wales.

If a number doesn’t appear valid, you may be dealing with a business that is either unregistered or still waiting for HMRC approval. The system also notes when the check was completed, which can help in maintaining records and ensuring VAT compliance.

The checker is particularly useful for accountants and procurement departments who want to vet suppliers before transactions.

Can You Contact HMRC If a VAT Check Causes Problems?

HMRC’s online Check a UK VAT Number service should normally be the first option for confirming a UK VAT registration number. If a business has a VAT-related query, cannot resolve an issue online or needs further HMRC support, it can contact the VAT general enquiries helpline.

HMRC’s current contact details are:

• UK Telephone: 0300 200 3700
• Outside The UK: +44 2920 501 261
• Opening Hours: Monday to Friday, 8am to 6pm
• Bank Holidays: Closed

HMRC advises callers who already have a VAT registration to have their VAT number and postcode available. The telephone service uses speech recognition and callers may also be asked security questions.

People who cannot hear or speak on the phone can use Relay UK by dialling 18001 then 0300 200 3700.

Therefore, the phone numbers and opening hours in the existing article do not need a numerical update for 2026.

Can You Check VAT Registration Using Only a Company Name?

HMRC’s official VAT checker does not allow a user to search for VAT registration by company name. A VAT registration number must already be known before it can be entered into the government checker.

If the VAT number is not available, several steps can help locate it:

1. Check VAT invoices previously issued by the business
2. Look at receipts supplied by the company
3. Check the company’s official website, where some businesses publish their VAT number
4. Ask the company directly for its VAT registration number
5. Once obtained, enter the number into HMRC’s official VAT checker

Companies House can be useful for confirming details such as a limited company’s legal name, company number and registered office, but Companies House registration does not prove that a company is VAT registered.

Third-party VAT lookup websites may help locate possible VAT numbers, but their results should not replace verification through HMRC’s official service.

What If You Need to Validate a VAT Number from an EU Country?

If you’re dealing with a business based in the European Union, you’ll need to use the VAT Information Exchange System (VIES) instead of HMRC tools. This platform allows you to verify VAT registration for businesses located in EU member states.

Great Britain is outside the EU VAT system, so VAT numbers beginning GB should be checked using HMRC rather than VIES. Northern Ireland has a different arrangement for certain movements of goods under the Windsor Framework.

Businesses trading in qualifying goods between Northern Ireland and the EU may use an XI prefix before their normal nine-digit UK VAT registration number, such as XI123456789.

The XI identifier relates to Northern Ireland’s alignment with EU VAT rules for goods and should not be treated as the standard VAT prefix for every Northern Ireland transaction.

The European Commission’s VIES VAT Number Validation service can be used to check VAT numbers issued by EU member states and qualifying Northern Ireland VAT numbers beginning XI. GB VAT numbers are no longer validated through VIES.

If an EU or XI VAT number is shown as invalid, check that the country code and digits have been entered correctly and confirm the details with the supplier before relying on the invoice.

What to Do If the VAT Number Seems Invalid or Can’t Be Found?

An invalid VAT number doesn’t always mean a business is fraudulent. There are several reasons why a check might return as “not found”.

It’s possible that the business has applied for VAT but has not yet been approved. HMRC does not display VAT numbers for pending applications. It’s also worth checking that the VAT number is entered correctly, with no extra spaces or wrong digits.

In some instances, the business may have deregistered from VAT, either voluntarily or because it no longer meets the turnover threshold.

When in doubt, contact the business directly for clarification. You may also contact HMRC for support. Always ensure that any VAT charged on invoices comes from a valid and active VAT-registered company.

Can You Access VAT Information Through Your Business Tax Account?

Yes, if you are a VAT-registered business, you can access comprehensive VAT information by logging into your HMRC Business Tax Account via the Government Gateway.

Inside your account, you can:

• Submit VAT returns
• View previously submitted returns
• Track repayments or claim statuses
• Change your VAT registration details
• Review your payment history and liabilities

This tool is highly useful for business owners and accountants managing multiple clients. It’s also the best place to check correspondence or alerts from HMRC regarding your VAT status.

Setting up a business tax account is free, and it’s advisable for all VAT-registered entities to maintain one for smoother communication with HMRC.

Who to Contact for Further VAT Help or Complex Queries?

Some VAT issues may require deeper support, especially if they involve insolvencies, international trade, or administrative errors.

HMRC Contact Options

1. Digital Assistant: Available on HMRC’s website, this chatbot helps answer common VAT questions.
2. Live Advisers: If the assistant cannot help, it will route you to an HMRC representative.
3. By Post: You can send letters to:

BT VAT
HM Revenue and Customs
BX9 1WR
United Kingdom

Postal replies can take more than 15 working days. Include all relevant documentation to avoid delays.

In cases involving fulfilment house due diligence schemes, digital VAT issues, or Making Tax Digital compliance, specific departments will handle your request.

Conclusion

Checking whether a company is VAT registered remains straightforward in 2026 when the correct official service is used.

For UK VAT numbers, HMRC’s online checker should be the primary verification method because it can confirm whether a VAT registration number is valid and identify the registered business.

The current UK VAT registration threshold remains £90,000, while Northern Ireland businesses involved in qualifying EU goods transactions may use an XI VAT number under the Windsor Framework.

If a VAT number is not known, first obtain it from the supplier, an invoice, receipt or other business information and then verify it through HMRC. Businesses should avoid treating Companies House records or third-party VAT searches as definitive proof of VAT registration.

Keeping evidence of important VAT checks can also provide a clearer audit trail when reclaiming VAT or carrying out supplier due diligence.

FAQs

How do I check a UK VAT number?

Use HMRC’s online VAT checker to validate the number and view the registered business name and address.

Can I verify VAT numbers over the phone?

Yes, HMRC offers a phone service where you can verify VAT numbers and get assistance.

Is it free to check VAT numbers?

Yes, both the HMRC and VIES platforms are free to use for checking VAT numbers.

Can I check a VAT number using a business name?

Yes, company websites and services like Companies Made Simple can help you find VAT numbers by business name.

What does an invalid VAT number mean?

It could mean the number is incorrect, unregistered, deregistered, or pending approval.

Do Northern Ireland businesses have different VAT rules?

Yes, for EU trade, they use different formats and fall under certain EU VAT regulations.

What if I can’t find any VAT information?

Try contacting the business or HMRC directly for clarification and support.