What Transit Actually Does
Customs duty is normally due when goods cross into a customs territory. If you are shipping from a non-EU origin into the EU and then on into the UK, that would ordinarily mean paying duty (and clearing customs) at the EU border, then again at the UK border, then claiming any refunds back. Inefficient and expensive.
The Common Transit Convention (CTC) solves this. Goods declared under transit can move from an office of departure to an office of destination — potentially through multiple customs territories — without paying duty along the way. Duty becomes payable only at the final office of destination, where the transit is "discharged" and the goods enter free circulation (or proceed to another customs procedure).
The most common transit document for road freight is the T1, declared on the New Computerised Transit System (NCTS).
When You Need a T1
Typical scenarios where T1 transit applies:
- Goods arriving in continental Europe by sea and continuing by road into the UK
- Goods moving from the UK through one or more EU countries to a final non-EU destination
- Goods moving between two CTC parties (UK, EU, Switzerland, Norway, Iceland, Türkiye, Serbia, North Macedonia and others) where they are not yet in free circulation
- Re-export movements where the goods left and are returning under different customs treatment
If your goods are already in free circulation in the EU and you are simply moving them across an internal EU border, you do not need transit — you need an internal movement document. T1 is specifically for goods that are not yet cleared in the territory they are crossing.
The Guarantee Requirement
Here is what catches new traders out: the T1 movement is only allowed if there is a customs guarantee in place to cover the potential duty if the goods do not arrive at destination. That guarantee can be:
- A comprehensive guarantee authorised by HMRC, often used by hauliers with regular transit traffic
- A one-off cash deposit at the office of departure, returned when the transit closes
- A carrier guarantee provided by your broker as part of the service
The guarantee value is set against the potential duty and tax exposure — usually 100% of the calculated risk. A pallet of high-value electronics needs a larger guarantee than a pallet of construction stone. Get the value wrong and the office of departure will reject the movement.
How Discharge Works
A T1 is not closed when the goods arrive at destination — it is closed when the office of destination confirms arrival on NCTS and the office of departure is notified electronically.
If this notification does not happen — for example, because the driver did not present the document at destination, or the destination office was closed — the system records the movement as non-discharged. After a grace period, the guarantee is drawn down and the duty becomes payable.
This is the second thing that catches people out. A driver who skips presenting the T1 at destination does not save anything. They have created a non-discharge situation that the broker now has to chase, often after the fact and often with the guarantee already drawn.
Practical Tips for Road Hauliers
If you regularly run transit movements:
- Carry the T1 and Transit Accompanying Document (TAD) with you — paper for backup. NCTS is electronic but the paperwork is still produced and matters at the gate.
- Know the destination office hours before you depart. If you arrive after closing, you may need an authorised consignee at the receiver's premises.
- Confirm receipt — request that the office of destination signs off on the TAD or sends the electronic confirmation while you are present.
- Do not deviate from the declared route without informing the office of departure. T1 movements have a declared route and timing.
- GVMS plays nicely with T1 at UK ports. The GMR can carry the T1 MRN as one of the references — no separate paperwork queue.
Authorised Consignee and Authorised Consignor
For traders with frequent transit movements, HMRC offers Authorised Consignor (start a transit from your own premises rather than an office of departure) and Authorised Consignee (close a transit at your own premises rather than an office of destination). Both are accreditations requiring HMRC application and ongoing compliance.
Worth applying for if your volume justifies it. Saves significant time at customs offices.
Where We Fit In
We prepare T1 declarations on NCTS for clients running transit movements through the UK. We can arrange the financial guarantee, ensure the route and timing are realistic, and follow up on discharge if something goes wrong at destination. For regular traffic, we will help you assess whether an Authorised Consignor/Consignee authorisation makes sense.
Call us with your route and consignment details and we will quote on the work.