How does UK–Poland trade work after Brexit?
Since 2021 the United Kingdom has been a third country for Poland, so every movement of goods requires full customs formalities on both sides of the border. Exporting from Poland and importing into the UK are two separate operations, as are exporting from the UK and importing into the EU. The free flow of goods no longer applies, so paperwork must be prepared before departure, not at the border.
The key step is agreeing who is responsible for each declaration: the exporter, the importer, the carrier or a customs agent. Blurred responsibility is the most common cause of vehicles being held on the Poland–UK route.
Importing from Poland into the UK
A UK import requires a CDS declaration, the consignee’s GB EORI number and a complete document set: commercial invoice, transport document and goods origin data. Before boarding a ferry or the tunnel, the driver needs a GMR number linking all declaration references to that single crossing.
The Polish exporter files an export declaration in AIS/IMPORT or through a Polish customs agency. Agree the Incoterms, because they determine who pays duty and VAT and who formally acts as the UK importer.
Exporting from the UK to Poland
When leaving the UK, the export declaration is filed in CDS, and the goods can travel to Poland under a T1 transit movement opened in NCTS. Transit allows the import clearance to move to the destination office in Poland, which shortens the stop at the French border and at the port.
On the EU side an ENS safety and security declaration is required in ICS2, and once in Poland the transit must be ended and an import declaration filed in AIS/IMPORT. Each stage has its own reference numbers, which must match the driver’s paperwork.
How to streamline regular shipments
Companies shipping regularly save time by fixing a repeatable pattern: the same commodity codes, verified party details and consistent routes. Keep a register of declarations and MRN numbers, as it simplifies amendments, returns and inspections.
Working with one customs agency on the UK side and a trusted partner on the Polish side reduces the number of hands documents pass through. Fewer intermediaries means less risk of discrepancies between the invoice, the declaration and the actual load.
Before you commission the work
- Agree Incoterms and declaration responsibilities.
- Check EORI numbers on both sides.
- Prepare the invoice, transport document and origin data.
- Plan the GMR, T1 transit and ENS declaration before departure.
What to watch out for
Do not assume the carrier handles clearance. The declarant is responsible for the accuracy of the declaration, and an error in the commodity code or value can mean an inspection, an amendment and extra standing costs.
Official sources
- GOV.UK — Trading with the European Union
- GOV.UK — Check duties and customs procedures for exporting goods
- Podatki.gov.pl — Polish customs clearance information
General information, not a customs decision or individual tax advice. Requirements depend on goods, route and circumstances; check current guidance before transport.
