What is Trader Support Service (TSS)?
TSS is a free government service supporting traders and carriers with customs and safety requirements for Northern Ireland goods movements.
Goods movements involving Northern Ireland are subject to arrangements under the Windsor Framework. The correct process depends on the origin, destination, final use of the goods and the trader's authorisations.
| Aspect | What to know |
|---|---|
| Core meaning | Free-to-use service |
| Operational use | Supports NI movements |
| Control point | Connects multiple customs systems |
| Key caution | Trader remains responsible for data |
How does it work in practice?
Users provide movement and consignment data through the portal, which can interact with CDS, GVMS, NCTS and ICS2 as appropriate.
The trader determines the movement route, eligibility, EORI identifiers and declaration route before providing references to the carrier. TSS, GVMS, CDS, NCTS or ICS2 may support different parts of the movement.
Decisions, exceptions and reference numbers should be recorded in the transport order or relevant system. This creates a clear audit trail of the information available and the actions taken by each party.
Key points to check
- Free-to-use service
- Supports NI movements
- Connects multiple customs systems
- Trader remains responsible for data
Always check current contract terms and official guidance as the correct application may vary by vehicle, goods, route, port, customer role or selected customs procedure.
Why does it matter for urgent transport?
For urgent Irish Sea movements, eligibility and digital references must be resolved before the vehicle reaches the port. Missing or mismatched data can prevent a valid GMR or boarding instruction.
Good preparation prevents a fast vehicle movement from being delayed by missing documents, unsuitable equipment, incorrect classification or denied access at the collection, border or delivery point.
Frequently asked questions
What is Trader Support Service (TSS) used for?
TSS is a free government service supporting traders and carriers with customs and safety requirements for Northern Ireland goods movements. Users provide movement and consignment data through the portal, which can interact with CDS, GVMS, NCTS and ICS2 as appropriate.
Is Trader Support Service (TSS) mandatory?
It applies only to the movements and traders within the relevant Windsor Framework rules. Current HMRC and Trader Support Service guidance is essential.
What should be checked before transport?
Confirm the parties, goods, documents, reference validity and requirements along the actual route. Where the rule is regulatory, use the latest guidance from the competent UK authority.
Sources: GOV.UK – Moving goods to and from Northern Ireland and Trader Support Service. Editorial review: 13 August 2026.