EORI Number Ireland: Complete Guide to Registration, Validation and Use in 2026

Any business or individual that engages in customs activities in Ireland needs an EORI. This includes Irish companies importing from outside the EU (including the UK since January 2021), Irish companies exporting to non-EU markets, sole traders involved in customs operations, non-commercial organisations that move goods through customs, non-EU businesses lodging declarations in Ireland, and customs brokers and agents filing on behalf of clients. If you are unsure whether your specific situation requires an EORI, Revenue Ireland's guidance confirms that anyone who files or causes to be filed an AIS, AES, ICS2 or NCTS declaration must have one.

An Irish EORI registered through ROS (Revenue Online Service) is active for Irish customs declarations immediately upon confirmation. You can use it to submit AIS and AES declarations to Revenue from the moment you receive the confirmation. The EORI may take up to 48 hours to appear in the EU EORI public validation database at ec.europa.eu, which is used by other parties (freight forwarders, shipping lines, foreign customs systems) to verify your registration. If your EORI does not appear in the EU validator after 48 hours, contact Revenue's eCustoms Helpdesk.

An Irish EORI number starts with the country code IE followed by 7 to 8 digits. For a company, those digits match the company's CT (corporation tax) registration number assigned by Revenue. For a sole trader, they match the income tax reference number. For example, a company with CT reference 1234567T would have the EORI IE1234567T. The format makes each EORI unique and directly traceable to the holder's existing Revenue registration.

Under the Windsor Framework, Northern Ireland remains in the EU single market for goods. Goods moving between Northern Ireland and the Republic of Ireland generally do not require standard EU customs declarations or an EU EORI for those movements. However, Northern Ireland businesses importing goods from outside the EU, or from Great Britain where goods are at risk of entering the EU single market, may need to interact with EU customs procedures and will require an EU EORI. Northern Ireland businesses operating in both UK and EU customs contexts may need both a UK HMRC EORI (XI prefix) and an Irish Revenue EORI (IE prefix). Contact Revenue Ireland or InterTradeIreland for guidance specific to your Northern Ireland trade flows.

Since Brexit, the UK and the EU operate separate EORI systems. An Irish EORI (IE prefix) is issued by Revenue Ireland and is valid for EU customs declarations in Ireland and across all EU member states. A UK EORI (GB prefix for Great Britain, XI prefix for Northern Ireland) is issued by HMRC and is valid for UK customs declarations through HMRC CDS. The two systems are not interchangeable. An Irish business exporting to the UK uses their IE EORI for the Irish AES declaration; the UK importer uses their GB EORI for the HMRC import declaration. If an Irish business also needs to file customs declarations directly in the UK, they may need to register for a UK EORI with HMRC.

Yes. The EU maintains a public EORI validation database at ec.europa.eu/taxation_customs/dds2/eos where any EORI number can be checked for registration status. Enter the full EORI including the country prefix to check whether it is active. Note that Irish EORIs registered through ROS are active in Revenue's systems immediately but may take up to 48 hours to appear in the EU validator. For businesses filing high volumes of declarations, automated EORI validation through customs software (such as iCustoms) is more reliable than manual checking, as it validates EORI numbers in real time before each declaration is submitted to Revenue.

Once registered, your EORI is used in every customs declaration you or your agent submits to Revenue Ireland. For imports, it appears on your AIS declaration. For exports, it appears on your AES declaration and the generated MRN. For ICS2 Entry Summary Declarations filed for shipments to EU member states, your EORI identifies you as the declarant. For NCTS Phase 5 transit movements, your EORI appears in transit declarations. In short, your EORI is your customs identity — it connects every declaration you file to your Revenue registration and makes your customs history auditable by Revenue over a four-year lookback period.

Customs declarations software that integrates with Revenue AIS and AES can validate EORI numbers automatically before each declaration is submitted. When a declaration is prepared, the software checks the EORI of the declarant and the importer or exporter against the Revenue database. If an EORI is invalid, inactive or incorrectly formatted, the software flags the error before submission. This eliminates declaration rejections from EORI errors and removes the manual validation step from the customs workflow. iCustoms performs automated EORI validation on every AIS and AES declaration as part of its compliance check before submission to Revenue.