Northern Ireland · XI VAT
Northern Ireland XI VAT Number Checker
Check an XI VAT number in the EU VIES system and confirm it is valid for Northern Ireland–EU trade in goods — with the registered name and address.
What is a Northern Ireland XI VAT number?
An XI VAT number is a UK VAT number written with XI instead of GB, used by businesses that trade goods between Northern Ireland and the EU under the Windsor Framework. The digits are the same — Northern Bank Ltd’s GB853759092 is XI853759092 — and unlike GB numbers, XI numbers can be checked in the EU VIES system.
XI VAT number format
XI and the same nine digits as the business’s GB VAT number.
prefix
the GB number
Example: XI853759092 (Northern Bank Ltd, trading as Danske Bank, Belfast).
- Other forms: XI + 12 digits for branch traders; XIGD + 3 digits (government departments); XIHA + 3 digits (health authorities).
- Not the same check: A number valid as GB can be invalid as XI if HMRC has not recorded the business as trading goods under the Windsor Framework.
- Not a VAT number: An XI EORI number is a customs ID, not a VAT number. The sample XI123456789 is not a valid number.
- Name and address: VIES returns the registered name and address for a valid XI number.
How to check an XI VAT number
- 1 Find the VAT number on the invoice — EU customers must be invoiced with the XI prefix for goods under the Windsor Framework.
- 2 Enter it above with XI, or enter the GB number to check it as XI. The checker queries the EU VIES XI register.
- 3 Compare the returned name and address with your supplier or customer. If XI is invalid, check the number as GB too.
- 4 Want to run the official checks yourself? Our EU VAT verification guide walks through them step by step.
Frequently Asked Questions
What is an XI VAT number?
It is a business’s normal 9-digit UK VAT number with XI in front instead of GB, used when it trades goods under the Windsor Framework — for example XI853759092 instead of GB853759092.
What is the difference between XI and GB VAT numbers?
The digits are the same. GB is used for trade within the UK, with the rest of the world and for services; XI is used for goods located in Northern Ireland or moving between Northern Ireland and the EU. XI numbers can be checked in VIES; GB numbers cannot.
Why is a UK VAT number invalid with XI?
Usually because HMRC has not recorded the business as trading goods under the Windsor Framework — for example it trades only in Great Britain, or only in services. VIES checks validity for EU trade, not UK registration, so check the number as GB on our UK VAT number checker.
Who needs to use an XI VAT number?
A VAT-registered business that has goods in Northern Ireland at the time of sale, receives goods into Northern Ireland from EU VAT-registered businesses, or sells or moves goods from Northern Ireland to the EU. It is not needed for services or for trade within the UK.
What formats can an XI VAT number have?
XI followed by 9 digits; XI followed by 12 digits for branch traders; XIGD followed by 3 digits for government departments; and XIHA followed by 3 digits for health authorities.
Is an XI EORI number the same as an XI VAT number?
No. An XI EORI number is a customs identifier, not a VAT number, and it will not pass a VAT check. Queen’s University Belfast, for example, prints VAT number GB 254 7995 11 and EORI number XI254799511000.
Last reviewed: , against official sources.
Validate UK and EU VAT numbers at scale
Check GB, XI and EU VAT numbers in one API call — with registered name and address where available.