Traders must provide their unique Economic Operator Registration and Identification (EORI) number in all dealings with customs officials.
The EORI must be included on all pre-arrival and pre-departure information on goods entering or leaving the customs territory of the European Community, and when importing, exporting and moving goods under a transit procedure.
The number must also be used for customs authorities to exchange information and, where appropriate, to share information with other government departments and agencies.
It will also be used to analyse and exchange risk information between customs authorities and the European Commission.
Important: UK businesses that import or export (physical goods) with the EU will need a UK EORI number to continue trading if the UK leaves the EU with no deal.
Read the latest UK government guidance on whether you will need a UK EORI number to trade within the EU and how to get one.