- A T1 is a customs transit declaration that suspends duties and taxes while non-Union goods move through the EU customs territory. Duties are only triggered when goods are released for free circulation at the final destination.
- The system runs on the New Computerised Transit System (NCTS), linking 39 countries across the EU, EFTA, and the Common Transit Convention. Georgia joined in February 2025, Moldova and Montenegro in November 2025.
- Every T1 movement requires a financial guarantee. AEO-certified companies can reduce or eliminate the guarantee requirement -- a major operational advantage.
Your container lands at Rotterdam. The customs clearance is happening in Munich. You do not want to pay import duties in the Netherlands and then apply for a refund in Germany. That is exactly the problem the T1 document solves.
The T1 is an electronic customs transit declaration under the Union Customs Code (UCC). It suspends customs duties and other charges while non-Union goods move between two points within the EU customs territory -- or transit through the EU entirely. The duty obligation only crystallizes when and where the goods are actually released for free circulation. If the goods just pass through and exit the EU, duties are never owed.
The Step-by-Step Flow
Here is how a T1 movement actually works, from start to finish:
- Document preparation. The declarant (usually a customs broker) gathers: commercial invoice, CMR waybill (road) or CIM consignment note (rail), packing list, export declaration from origin, and any permits or certificates.
- Declaration submission. The T1 is submitted electronically into NCTS with: goods description, commodity codes, full route (Office of Departure through Offices of Transit to Office of Destination), vehicle details, guarantee reference, and declarant information. NCTS assigns a unique Movement Reference Number (MRN).
- Transit Accompanying Document. Once accepted, the TAD prints from NCTS and must physically accompany the goods for the entire journey.
- Release at departure. The departure customs office verifies the declaration and guarantee, may inspect goods and apply customs seals, then releases the transit.
- Transport and transit offices. Goods move along the declared route with the TAD. The MRN enables real-time tracking via NCTS. At transit border crossings, customs may verify seal integrity.
- Arrival notification. At destination, goods and TAD are presented. The destination office records arrival, which sends a notification back to the departure office via NCTS.
- Discharge. The transit procedure is formally closed, the guarantee is released, and customs debt is extinguished. If goods fail to arrive within the prescribed time limit (typically 8 days from issuance), an inquiry procedure starts within 1 week. Debt recovery must begin within 7 months.
Who Is in the Club
The Common Transit Convention now spans 39 countries. All 27 EU member states, 4 EFTA countries (Norway, Switzerland, Iceland, Liechtenstein), and 8 non-EU contracting parties: the United Kingdom, Turkey (acceded December 2012), North Macedonia, Serbia, Ukraine (acceded October 2022), Georgia (February 2025), Moldova (November 2025), and Montenegro (November 2025).
Ukraine's accession has been transformative. The country processed roughly 94,000 NCTS transit declarations in 2024 and exceeded that total in just the first nine months of 2025, with over 95,000 declarations year-to-date. Since joining in October 2022, Ukraine has filed over 231,000 total declarations, primarily acting as the office of departure for goods moving westward into the EU.
The system currently operates on NCTS Phase 4, with Phase 5 being deployed across EU member states as part of the UCC digitalization program. Georgia's adoption of NCTS in 2025 extends the system's reach into the Caucasus, connecting the Black Sea to Central Asia trade routes.
The Guarantee Trap
Every T1 requires a financial guarantee covering the potential customs debt. Two types: single-transit guarantees (one movement, one guarantee) and comprehensive guarantees (all movements by the same principal over a period). The guarantee amount is calculated on the full customs debt that would be payable if the goods were released for free circulation.
For companies moving significant volumes, the costs add up. This is where AEO (Authorized Economic Operator) status changes the math. AEO-certified companies can get a guarantee waiver or reduction -- typically to 30% or even 0% of the reference amount. For a company moving 50 containers a month under T1, the difference between full guarantee and AEO waiver is a six-figure annual working capital saving.
The trap: if your guarantee is insufficient, customs will not release the transit. Full stop. And if the transit procedure is not properly discharged -- the goods do not arrive at the destination office, the MRN is not closed -- the principal is liable for the full customs debt. You can only avoid liability by proving the procedure ended correctly, or that the goods were destroyed or lost through force majeure.
T1 vs T2: The Non-Union Goods Distinction
T1 is for non-Union goods (not in free circulation). T2 is for Union goods (in free circulation) that need to move through a non-EU country and re-enter the EU -- for example, goods moving from Germany to Italy via Switzerland. The procedure mechanics are the same. The customs status of the goods determines which form you use. Do not confuse them. Filing a T2 for non-Union goods is a misdeclaration with consequences.
Frequently Asked Questions
When is a T1 transit document required?
When non-Union goods move between two points in EU customs territory without being released for free circulation at the first entry point. The textbook case: a container arriving at a major European seaport (Rotterdam, Antwerp, Hamburg) that is destined for inland customs clearance in a different EU country. Also required when goods transit through the EU from one non-EU country to another, or when non-Union goods move between EU member states for inward processing or repair.
How does the T1 transit guarantee work?
Single-transit guarantee covers one movement. Comprehensive guarantee covers all movements by the same principal. AEO-C certificate holders can receive a 100% guarantee waiver. AEO-S holders can receive a 30% reduction (to 70% of reference amount). Without AEO, the full guarantee amount must be lodged before transit begins. The guarantee is released when the transit procedure is properly discharged at the destination office.
Related Terms
- Customs Clearance -- The process of obtaining customs permission for goods to cross a border. T1 transit defers clearance from the port of entry to the inland destination.
- Customs Declaration -- The formal statement of goods required for customs procedures. The T1 is one specific type of customs declaration for the transit procedure.
- ATA Carnet -- An international customs document for temporary importation. ATA carnets serve a similar duty-suspension purpose as T1, but for temporary admission rather than transit to final clearance.
- Bonded Warehousing -- Storage of goods under customs control without payment of duties. T1 transit often connects a port of entry to a bonded warehouse inland.