Understand Your VAT Number (Great Britain)

What is a VAT number in Great Britain?

A VAT number is a unique ID that HM Revenue & Customs (HMRC) gives a business when it registers for VAT. In Great Britain, a standard VAT number starts with “GB” and has nine digits, such as GB123456789. It identifies the business for VAT records and dealings with customers, suppliers, and HMRC.

A VAT number is not the same as a company registration number or a personal tax reference. It confirms that a business is registered to account for VAT. Some businesses trade without one because they are not registered or do not need to register.

The format can vary in some cases. For example, a number may include an extra branch code. Northern Ireland businesses can also have VAT numbers that start with “XI” for certain trade with the EU. So, check the number with HMRC rather than relying on its format alone.

Why VAT numbers matter to a business

A VAT number helps HMRC link a business to its VAT returns and payments. Registered businesses usually charge VAT on taxable sales, then report that VAT to HMRC. They may also reclaim VAT paid on eligible business costs.

It also helps customers and suppliers confirm who is charging VAT. A business should show its VAT number on VAT invoices and other records where required. Customers often check a supplier’s details before claiming back VAT on a purchase.

Checking matters. If a number is wrong, inactive, or belongs to another business, a VAT claim could face delays or questions. Keep a record of checks for key suppliers, especially when setting up a new account or reviewing a large invoice.

• Use the number to support VAT records and returns
• Show it on VAT invoices where required
• Check supplier details before reclaiming VAT

How to obtain a VAT number

To get a VAT number, a business must register for VAT with HMRC. A business must usually register if its taxable turnover goes over £90,000 in a rolling 12-month period. It must also register if it expects to pass that limit in the next 30 days.

The £90,000 test uses taxable turnover, not profit. It covers sales that count for VAT, including zero-rated sales. Some sales are exempt and do not count in the same way. Check the rules for your type of work if your turnover is near the limit.

Businesses below the limit can often choose to register voluntarily. This may suit a business that pays VAT on many costs and sells mostly to VAT-registered customers. But voluntary registration can add record-keeping and reporting work. It may also raise prices for customers who cannot reclaim VAT.

Most businesses apply online through the HMRC VAT registration service. Gather your business details, bank details, turnover figures, and information about your goods or services. HMRC may ask for more detail before it approves the application.

1. Check whether your turnover means you must register, or whether voluntary registration suits your business.
2. Collect your business, owner, and sales details before starting the application.
3. Apply through HMRC and follow its instructions for any extra information.
4. Wait for HMRC to confirm your VAT number and registration date.
5. Update invoices and records, then file VAT returns by their due dates.

Do not charge VAT before your registration takes effect. Once HMRC confirms your registration, use the start date it gives you. Set up records for sales, purchases, VAT charged, and VAT paid. A late application can mean backdated VAT is due on sales.

HMRC explains the current rules and the steps to register for VAT. Keep the confirmation safe. You will need the number for invoices, returns, and checks with customers or suppliers.

How to check a VAT number

Use HMRC’s online service to check a UK VAT number. Enter the number as shown, including “GB” when asked. The service can confirm whether the number is valid and may show the name and address linked to it.

Compare the result with the supplier’s invoice and business details. A mismatch does not prove fraud, since a business may trade under a different name or use a billing address. Ask the supplier to explain the difference before you reclaim VAT.

Save the result with the invoice or supplier record. Note the date of the check and the details returned. Repeat the check when a supplier’s details change, or when a large or unusual charge needs extra care.

Use HMRC’s VAT number checker rather than a search result or an informal lookup site. If the service says the number is invalid, ask the supplier to confirm it. Do not treat a VAT number printed on an invoice as proof by itself.

UK VAT rates and what they mean

The standard VAT rate in the UK is 20%. It applies to most taxable goods and services. Some items use a reduced rate of 5%, while others are zero-rated or exempt.

Zero-rated sales are still taxable, but VAT is charged at 0%. Exempt sales sit outside the VAT system, so different rules can apply to related costs. The distinction can affect a business’s right to reclaim VAT on purchases.

For example, a VAT-registered shop may charge 20% on many household goods. Some energy-saving products or home fuel may qualify for a reduced rate, depending on the rules and circumstances. Basic food and children’s clothing are common examples of zero-rated goods.

Check the rate for each product or service before issuing an invoice. A business that sells items at different rates should keep clear records for each type. Applying the wrong rate can lead to incorrect invoices and VAT returns.

Common VAT number problems

A common issue is entering the number in the wrong format. Check for missing digits, misplaced spaces, or a mistaken letter. A standard GB number has nine digits after the prefix, but format alone cannot confirm that it is active.

Another issue is a name or address that does not match the checker result. Ask the supplier to confirm its registered details, especially after a merger or change of business name. Keep the answer with your records.

Businesses can also miss a registration deadline. Track taxable turnover each month, using a rolling 12-month total rather than a calendar-year figure. If you think the limit has been crossed, contact HMRC or a qualified tax adviser promptly.

Finally, do not assume that VAT registration ends when a business stops trading or falls below the threshold. HMRC must cancel the registration. Until cancellation takes effect, the business may still need to charge VAT and submit returns.