What is an EORI, really?
An EORI (Economic Operators Registration and Identification) number is the customs system's way of identifying a legal entity that moves goods across a customs border. Without one, you cannot be named as importer or exporter on a declaration, you cannot appear on a Goods Movement Reference (GMR) for a UK port, and you cannot be listed on a Pre-Boarding Notification (PBN) at an Irish port.
The complication in UK–Ireland trade is that three different EORI types may come into play on a single route.
GB EORI — for Great Britain customs
Issued by HMRC. Required whenever your business acts as importer, exporter or declarant on a UK customs entry where the goods enter or leave Great Britain (England, Scotland, Wales). If you sell into GB from Ireland, or move goods out of GB, you need one.
XI EORI — for Northern Ireland-linked movements
Also issued by HMRC, but separately. Required when your goods movement is linked to Northern Ireland — most commonly, GB↔NI or EU↔NI flows. The Windsor Framework changes how many of these movements are declared, but it does not remove the underlying XI EORI requirement for at-risk goods.
IE EORI — for Republic of Ireland customs
Issued by Irish Revenue. Required when your business is the importer or exporter of record on an Irish customs entry — imports into the Republic from GB or third countries, exports out of the Republic to non-EU destinations. If you are UK-based but import goods into Ireland in your own name, you need either an IE EORI of your own or to appoint an indirect representative with one.
A concrete example
A Turkish textile manufacturer sells to a retailer in Dublin. The cargo lands at Holyhead on a UK-flagged truck, transits the UK, re-exports to Dublin via Holyhead→Dublin ferry.
- The Turkish exporter needs neither GB nor IE EORI — they're outside the customs territory.
- The haulier moving through GB needs a GB EORI if they are declarant on the transit.
- The Dublin retailer (importer of record in Ireland) needs an IE EORI.
- If the same retailer also buys UK goods that pass through Northern Ireland on the way, an XI EORI may come into play.
Practical rules of thumb
- If in doubt, apply for the EORI that matches where your business is registered first.
- Don't assume a UK VAT number is enough — it isn't.
- Allow a few working days for GB; longer for XI and IE, where supporting evidence is heavier.
- Once issued, link the number to the customs systems you'll actually use (CDS, AIS, GVMS, PBN) — an EORI that exists but isn't tied in will still fail at the gate.
Need help deciding which you need? Contact us and we'll walk you through the route and apply on your behalf.