What Is a T1 Transit Declaration?

A T1 transit declaration is a customs document used to move non-Union goods between two points within the Common Transit area without paying import duty or VAT at every border crossing. The procedure is governed by the Common Transit Convention (CTC) and operated electronically through the New Computerised Transit System (NCTS).

T1 transits are the workhorse of cross-border road and rail freight in Europe — used whenever goods need to travel under customs supervision until they reach an authorised office of destination where the import procedure (or another transit) takes over.

When Do You Need a T1?

You typically need a T1 in scenarios such as:

Non-EU goods arriving in the UK that need to be moved inland to a bonded warehouse, free zone, or inland clearance office before being formally imported.
Goods imported into the EU that need to cross the UK (e.g., from Ireland through GB to mainland Europe) without being released for free circulation.
Goods originating outside the Common Transit area (e.g., from China, Türkiye outside CTC scope, or the US) moving from an EU port to a final inland destination.
Multimodal movements where customs control needs to be maintained while goods change transport mode.

What Information Does a T1 Contain?

Every T1 declaration includes:

Office of departure (where the procedure starts)
Office of destination (where it will be discharged)
Office(s) of transit (any border offices on the route)
Principal (the holder of the procedure)
Consignor and consignee details
Description, quantity and value of goods
Commodity codes (HS classification)
Guarantee reference (CGU or individual)
Itinerary and mode of transport

Once submitted in NCTS, the system returns a Movement Reference Number (MRN) and a printable Transit Accompanying Document (TAD) that physically travels with the goods.

How Does the Procedure Work?

Declaration submitted (IE015) — The declarant lodges the T1 in NCTS before the goods leave the office of departure.
Release granted (IE029) — NCTS releases the goods for transit and assigns the MRN.
Goods presented at offices of transit — At each border, the haulier presents the TAD and the office records arrival (IE118).
Arrival at office of destination (IE007) — The consignee or authorised consignee notifies NCTS that the goods have arrived.
Discharge (IE045) — The office of destination discharges the procedure, releasing the guarantee.

Why Use a Specialist Broker?

T1 declarations are highly sensitive to errors: a wrong office code, an under-valued guarantee, or a missing itinerary can result in the TAD being rejected at the office of transit, leading to costly delays. A specialist transit broker:

Validates every data element against current NCTS Phase 5 requirements
Provides comprehensive guarantee cover (CGU)
Monitors the movement and intervenes if the discharge is delayed
Issues the TAD within minutes of receiving paperwork

At T1 Transit, we file T1 declarations 24/7 for hauliers and traders across the UK, EU and Türkiye. Contact us for a quote on your next movement.