XI EORI Number — Northern Ireland

After Brexit, UK customs split into GB and Northern Ireland tracks. The XI EORI number exists for traders whose goods movements involve Northern Ireland under EU-aligned customs rules. If you ship to, from or through NI, you need to understand XI — not just GB.

Last updated: July 29, 2026

For broader UK context see EORI number UK. To validate any number use our EORI checker.

What is an XI EORI number?

XI is the country code used in the EORI system for Northern Ireland economic operators. It was introduced when the UK left the EU but Northern Ireland retained alignment with EU customs rules for goods under the NI Protocol and later the Windsor Framework.

HMRC issues XI EORI numbers alongside GB numbers. An XI EORI is registered in the EU EORI database — unlike GB numbers, which sit in HMRC's separate register.

GB vs XI — which EORI do you need?

Many businesses trading with Northern Ireland hold both numbers. Using the wrong prefix on a declaration is a common cause of customs delays.

Who needs an XI EORI number?

You may need an XI EORI if you:

• Import goods into Northern Ireland from outside the UK and EU.
• Export from Northern Ireland to countries outside the EU under NI rules.
• Move goods between Northern Ireland and the EU where XI identification is required on the declaration.
• Are a GB-based business regularly declaring goods through Northern Ireland customs routes.

Great Britain-only traders with no Northern Ireland touchpoints typically need only a GB EORI. When in doubt, ask your customs broker or check HMRC guidance for your specific movement type.

XI EORI number format

Pattern: XI + 12 digits
Example: XI123456789000

The structure mirrors GB EORI. Full format reference: EORI number format.

How to apply for an XI EORI number

1. Get a GB EORI first — apply via GOV.UK if you do not already have one. See how to get an EORI number.
2. Log into Government Gateway with the same credentials used for GB registration.
3. Apply for XI EORI through HMRC's EORI service — indicate that you need a Northern Ireland (XI) number.
4. Receive confirmation — usually quickly, same as GB.
5. Validate — check the new XI number with our EORI checker (XI numbers appear in the EU database).

There is no fee for XI registration.

Do you need to be established in Northern Ireland?

Since the EORI system treats XI numbers as part of the EU register, HMRC applies establishment rules to them. Broadly, you can hold an XI EORI if you:

• Have a permanent business establishment in Northern Ireland — premises, staff and the human/technical resources to carry on business there; or
• Are not established in NI but need an XI EORI for specific customs purposes HMRC recognises — for example lodging declarations in Northern Ireland or getting a customs decision that applies there, typically alongside an indirect customs representative.

HMRC has periodically reviewed XI registrations and removed numbers from businesses that could not show an NI establishment or a qualifying customs need. If you received such a letter, respond with evidence of your NI address or the customs activity the number supports — otherwise the XI EORI is withdrawn while your GB number continues unaffected.

How to check an XI EORI number

Because XI numbers live in the EU EORI system, you can validate them with:

• Our EORI checker (queries EU EOS for XI and EU prefixes)
• The European Commission's public EORI validation service

GB numbers cannot be checked this way — use HMRC's checker for GB-only validation.

Windsor Framework and NI trade lanes

The Windsor Framework (2023) refined how goods move between Great Britain and Northern Ireland, including green lane and red lane concepts for NI-bound goods. Customs treatment depends on the destination, origin and risk profile of the shipment — not every NI movement uses XI, but many regular NI traders maintain an XI EORI as standard practice.

Rules evolve; confirm your obligations with HMRC, your broker, and current GOV.UK guidance before changing declaration procedures.

Common XI EORI scenarios

• NI retailer buying stock from the EU. Goods moving from Ireland or the wider EU into Northern Ireland stay within EU-aligned customs arrangements — the NI business identifies itself with its XI EORI on any required paperwork, not GB.
• GB wholesaler supplying NI shops. Goods moving Great Britain → Northern Ireland cross into the EU-aligned zone. Depending on the goods and whether they are "at risk" of onward movement to the EU, declarations under the Windsor Framework may name the trader's XI EORI, often alongside UK Internal Market Scheme authorisation for the green lane.
• NI manufacturer exporting worldwide. Exports from Northern Ireland to non-EU countries are declared under NI rules with the XI number; sales to the EU generally move without customs declarations at all, like intra-EU trade.
• EU business shipping to Northern Ireland. No UK-side EORI is usually needed — the movement stays within the EU customs framework, identified by the EU supplier's own EORI.

Common XI EORI problems (and fixes)

• Wrong prefix on the declaration. Quoting GB where the movement requires XI (or vice versa) fails validation. Match the prefix to the customs territory handling the declaration.
• XI number failing after an HMRC review. If your XI EORI was withdrawn for lack of NI establishment, declarations referencing it will bounce — re-apply with evidence, or restructure the movement through an NI-established representative.
• Checker says "not found" for a new number. Fresh XI registrations can take a little time to propagate to the EU EOS database. Re-check after a few hours before assuming an error.
• Holding XI but not GB. The GB number is a prerequisite — if your GB EORI lapses (for example after dissolving and re-forming a company), the XI registration must be redone as well.