Last Updated On 07.10.2026

If you want to know how to check if a company is VAT registered, the most reliable method is to obtain its VAT registration number and enter it into the official UK VAT number checker.

The checker can confirm whether the number is valid and show the registered business name and address connected with it. This is particularly important when checking a new supplier, reviewing an invoice or deciding whether VAT charged on a purchase can potentially be reclaimed.

You cannot search the official VAT register simply by entering a company name. If you only know the business name, you first need to find or request its VAT number and then verify that number.

In 2026, the UK VAT registration threshold remains £90,000 of VAT-taxable turnover. Businesses below the compulsory registration threshold can also register voluntarily.

What Steps Should You Follow to Verify a Company’s VAT Registration?

The checking process is relatively simple when you already have the company’s VAT number.

Follow these steps:

1. Find The VAT Number: Look on the supplier’s VAT invoice, receipt, website or other business documents.
2. Open The Official UK VAT Checker: Use the government’s VAT number checking service rather than relying solely on a third-party database.
3. Enter The VAT Number: Input the registration number shown by the supplier.
4. Check Whether It Is Valid: The result should confirm whether the registration is currently valid.
5. Compare The Business Details: Check whether the registered name and address are consistent with the company you are dealing with.
6. Keep Evidence Of Important Checks: Businesses conducting supplier due diligence may want to retain the date and result of significant checks.

A valid number alone should not end your checks if the business details displayed do not correspond with the supplier.

Can You Check VAT Registration Using Only a Company Name?

No. The official UK checker requires a VAT registration number and does not provide a public company-name search of the VAT register.

If you only have the business name, try the following:

• Check A VAT Invoice Or Receipt From The Company
• Look At The Company’s Official Website
• Review Quotes, Contracts Or Order Documents
• Ask The Company For Its VAT Registration Number
• Ask For A Copy Of Its VAT Registration Certificate Where Appropriate

Once you obtain the number, verify it independently rather than treating the document or website alone as proof.

The official company register can also help you confirm the legal company name, registration number and registered office. However, incorporation and VAT registration are separate processes, so finding a company on the company register does not prove that it is VAT registered.

What Does a UK VAT Number Look Like?

A standard UK VAT registration number contains nine digits. It may be displayed with a GB prefix, particularly in situations where the country identifier is relevant.

For example:

GB123456789

Businesses connected with qualifying Northern Ireland and EU goods transactions may use an XI prefix rather than GB for those transactions.

There are also less common cases involving VAT groups or branches where a three-digit suffix can be added to the standard nine-digit number, creating a 12-digit reference.

Reference	Typical Format	Main Purpose
UK VAT Number	GB + 9 Digits	Identifies a VAT-registered business
Branch Or Group Reference	9 Digits + 3-Digit Suffix	May identify a particular branch or group member
XI VAT Number	XI + 9 Digits	Certain Northern Ireland and EU goods transactions
Company Number	Separate Registration Number	Identifies an incorporated company
UTR	10 Digits	Used for tax administration
EORI	Usually Country Prefix + 12 Digits	Used for customs and international trade

Do not assume that a company number, UTR or EORI automatically proves VAT registration.

How Should You Cross-Check the Company Details?

A strong VAT check involves more than confirming that the number exists.

Compare the VAT-check result against information you already hold about the supplier.

Check:

• Legal Business Name
• Trading Name If Different
• Business Address
• Company Registration Number Where Applicable
• Details Shown On The Invoice
• Details Shown On Contracts Or Purchase Orders

A trading name may legitimately differ from the company’s legal name. What matters is whether you can establish a credible connection between the VAT registration and the supplier issuing the invoice.

For a limited company, comparing the information against its official company record can provide an additional level of supplier due diligence.

What Are the Warning Signs of a Suspicious VAT Number?

Several warning signs deserve further investigation.

Warning Sign	What You Should Do
VAT Charged But No VAT Number Shown	Request a compliant VAT invoice
VAT Number Returns As Invalid	Check the digits and ask the supplier to confirm it
Registered Name Is Completely Different	Ask the supplier to explain the connection
Address Does Not Match Expected Details	Cross-check the company’s current legal details
Supplier Refuses To Provide Its VAT Number	Do not rely on VAT charges without clarification
Number Appears To Be A Company Number Or UTR	Request the actual VAT registration number
Previously Valid Number Stops Working	Check whether the supplier has deregistered

An unusual result does not automatically mean fraud. Businesses can restructure, change addresses, join VAT groups, transfer businesses or deregister.

However, unexplained inconsistencies should not be ignored.

What Should You Do If the VAT Number Is Invalid?

First, check whether the number has been entered correctly. Spaces or formatting normally should not affect the underlying number, but incorrect digits certainly will.

Then contact the supplier and ask it to confirm:

• Its Current VAT Registration Number
• Its Legal Business Name
• Its Registered Address
• Whether Its VAT Registration Has Recently Changed
• Whether It Is Part Of A VAT Group

If you have been charged VAT but cannot establish that the supplier was authorised to charge it, request clarification and a corrected invoice where necessary.

Do not reclaim questionable VAT simply because an invoice contains the word “VAT”. A valid supporting invoice and a legitimate VAT charge are important when recovering input VAT.

A person who is not authorised to charge VAT can also face penalties for issuing invoices that show or include VAT. The consequences can become more serious where the behaviour is deliberate.

Why Might a Genuine Company Not Be VAT Registered?

Not every legitimate business needs VAT registration.

A company may not be registered because:

• Its VAT-Taxable Turnover Is Below £90,000
• It Has Chosen Not To Register Voluntarily
• Its Activities Are Mainly Or Entirely Exempt
• It Has Recently Started Trading
• Its Registration Application Is Still Being Processed
• It Has Stopped Making Taxable Supplies
• It Has Deregistered

The voluntary VAT deregistration threshold is currently £88,000. This means a business whose expected taxable turnover falls below that level may be able to apply to cancel its registration, subject to the applicable rules.

Therefore, a supplier that had a valid VAT number in the past may not necessarily remain registered indefinitely.

Businesses approaching the registration threshold should understand when VAT registration becomes necessary rather than relying only on annual turnover at the end of the financial year.

What Should a Valid VAT Invoice Include?

Checking the supplier’s VAT registration is particularly important when you intend to reclaim VAT.

A full VAT invoice would normally include information such as:

• A Unique Invoice Number
• Date Of Supply
• Invoice Date
• Supplier’s Name And Address
• Supplier’s VAT Registration Number
• Customer’s Name And Address
• Description Of Goods Or Services
• Quantity Or Extent Of The Supply
• Net Amount
• Applicable VAT Rate
• VAT Amount
• Total Amount Payable

The business details shown on the invoice should be consistent with the VAT registration being used.

Receiving a document headed “invoice” does not automatically make it sufficient evidence for VAT recovery.

Can You Check EU and Northern Ireland VAT Numbers?

Different checking arrangements apply when dealing with businesses outside Great Britain.

VAT numbers issued by EU member states can be checked through the European VAT validation system.

Great Britain VAT numbers beginning GB should be checked through the UK system instead.

Northern Ireland businesses can use an XI identifier for certain transactions involving goods moving between Northern Ireland and the EU. An XI number should not be interpreted as replacing the normal UK VAT arrangements for every transaction carried out by a Northern Ireland business.

For international suppliers, always verify the country prefix as well as the digits because VAT number structures differ between countries.

Should Businesses Check Suppliers More Than Once?

For occasional low-risk purchases, repeatedly checking an established supplier before every invoice may be unnecessary.

However, another check can be sensible when:

• A Supplier Changes Its Legal Name
• Its Address Changes
• Bank Details Suddenly Change
• A VAT Number On An Invoice Changes
• The Supplier Has Not Been Used For A Long Time
• The Purchase Is Unusually Large
• Previous Checks Produced Inconsistent Results

Procurement teams and accounting firms dealing with large supplier lists can create a supplier verification log containing the supplier name, VAT number, check date, result and any supporting reference.

Businesses managing VAT returns and digital financial records may also find suitable business accounting software useful for organising invoices and maintaining consistent tax records.

For organisations carrying out VAT checks at scale, an official VAT number checking API is also available for software-based due diligence. It can check registrations and return associated business details, although access and authentication requirements apply.

How Can You Find Your Own VAT Number?

If you are trying to locate your own business’s VAT number rather than checking a supplier, look at:

• Your VAT Registration Certificate
• Previous VAT Returns
• VAT Invoices Issued By Your Business
• Your Online Business Tax Account
• Correspondence About Your VAT Registration
• Accounting Software Holding Your VAT Settings

Do not confuse your VAT number with your company registration number, UTR or EORI number.

If you are still waiting for your first VAT registration number, you cannot simply create one yourself or use another tax reference as a substitute.

Conclusion

Knowing how to check if a company is VAT registered is an important part of supplier verification and VAT record keeping.

Start by obtaining the company’s VAT registration number and checking it through the official UK VAT checker. Confirm that the number is valid, then compare the registered name and address with the supplier’s invoice and other business details.

You cannot confirm VAT registration through a company-name search alone, and appearing on the official company register does not prove VAT registration.

If a number is invalid, has changed or belongs to a business whose details do not match the supplier, investigate before reclaiming the VAT. Keeping evidence of important checks can also create a stronger audit trail for your business.

FAQs

Can I Check Whether a Company Is VAT Registered for Free?

Yes. The official UK VAT number checking service is free to use and can confirm whether a supplied VAT number is valid.

Can I Check VAT Registration Using a Business Name?

No. You need the VAT registration number before using the official checker. If you only have the business name, obtain the number from an invoice, receipt, website or directly from the company.

Is a Company Number the Same as a VAT Number?

No. A company registration number identifies an incorporated company, while a VAT number identifies a business registered for VAT.

Does Every Limited Company Have a VAT Number?

No. Incorporating a limited company does not automatically register it for VAT. VAT registration depends on the applicable VAT rules or whether the business registers voluntarily.

What Does an Invalid VAT Number Mean?

It may be mistyped, cancelled, not yet active or associated with a business that has deregistered. Confirm the details with the supplier before assuming that the company is fraudulent.

Can a Business Charge VAT While Waiting for Its VAT Number?

A business awaiting its VAT number has specific rules for accounting for VAT during the registration period. It should not simply invent a VAT number or issue an ordinary VAT invoice using another tax reference.

Can a VAT Number Have 12 Digits?

A standard UK VAT registration number has nine digits, but certain branch or VAT group references can contain a further three-digit suffix. Check the complete reference if a supplier operates under such an arrangement.

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

There is no need to check every established supplier before every transaction. Rechecking is sensible after significant changes, long periods of inactivity, unusual transactions or inconsistencies in the supplier’s details.