T1 Transit Procedure Explained — Complete Guide for Road Freight

If you move goods by road between the EU and the UK, Switzerland, Norway, or Turkey — or transit through a non-EU country to reach another EU country — you have almost certainly encountered the T1 document. It is one of the most misunderstood procedures in European road freight, and mistakes with it cause some of the most expensive delays at border crossings.

What Is a T1 Document?

T1 is a customs transit document used to move goods that are not in free circulation within the EU (or Common Transit Area) under a customs suspension arrangement. “Suspension” means import duties and VAT are suspended — not yet assessed or paid — while the goods are in transit.

The formal name is External Transit Declaration (T1). It operates under the Common Transit Convention (CTC), which includes all 27 EU member states, the United Kingdom, Switzerland, Norway, Iceland, Liechtenstein, North Macedonia, Serbia, and Turkey (partially).

The T1 document is essentially a promise to customs authorities: “These goods will reach the declared customs office of destination. If they don't, whoever opened this transit is liable for the duties and taxes.”

When Is a T1 Required?

T1 is required whenever non-EU goods move by road across borders within the Common Transit Area:

1. Goods arriving from outside the EU

A container arrives at Rotterdam from China. The importer is in Poland. The goods are placed under T1 transit to travel from Rotterdam to Warsaw, where they will be formally imported and duties paid.

2. Shipments from the EU to the UK (post-Brexit)

Since January 2021, the UK is a third country. If goods transit through another country en route to the Channel, a T1 may be required for the transit legs.

3. Shipments from the UK to the EU

UK goods entering the EU are non-EU goods until formally imported. A T1 covers them from the EU point of entry to the customs office of destination.

4. Transit through a non-EU country

EU goods passing through Switzerland or Serbia to reach another EU country must travel under T1 (or T2) to maintain their customs status.

5. Shipments to or from Norway, Iceland, Switzerland

These countries are in the Common Transit Area but not the EU customs union. Goods moving between the EU and these countries require T1 transit procedures.

T1 vs T2 — What Is the Difference?

The NCTS System

The T1 procedure runs through the New Computerised Transit System (NCTS) — an electronic system used by customs authorities across all Common Transit Convention countries. When a T1 declaration is lodged, NCTS:

• Issues a Movement Reference Number (MRN)
• Tracks the transit from office of departure to office of destination
• Alerts customs if a transit is not closed within the allowed time
• Allows customs offices en route to check the status

Key Parties in a T1 Procedure

Principal (Holder of the Transit Procedure)

The principal is the party who lodges the T1 declaration and takes legal responsibility for the transit. They are liable for any import duties and taxes if the goods do not reach the declared office of destination. This is the party at financial risk.

Guarantor

The principal must provide a customs guarantee — a financial security covering potential duties. Options include:

• Comprehensive guarantee — covers multiple movements, issued by a bank
• Individual guarantee — covers a single movement
• Guarantee waiver — available to AEO-certified traders

Carrier

The carrier must carry the Transit Accompanying Document (TAD), present goods at customs, deliver intact, and not break customs seals.

Authorised Consignee

An importer approved to receive transit goods at their own premises, closing the transit electronically without visiting a customs office.

The T1 Procedure — Step by Step

1. Lodge the transit declaration — The principal submits the T1 electronically through NCTS with goods description, HS codes, weight, value, route, guarantee reference, and vehicle details.
2. Receive the MRN — NCTS issues a unique Movement Reference Number. The MRN is printed on the Transit Accompanying Document (TAD) with a barcode.
3. Goods released for transit — Customs may release immediately, apply a seal, or conduct a physical inspection.
4. Transit in progress — The truck travels with the TAD. Customs at borders can scan the MRN barcode to verify status. Goods must arrive within the set time limit (typically 1–8 days).
5. Presentation at office of destination — Carrier presents goods, TAD, and supporting documents (commercial invoice, packing list, CMR) to customs.
6. Discharge of the transit — Customs discharges the transit in NCTS, releasing the guarantee.
7. Confirmation — The principal receives electronic confirmation. Import formalities begin separately.

The MRN Number

The Movement Reference Number (MRN) is an 18-character code uniquely identifying a transit movement. Example: 26PL123456789012X1

The first two characters indicate the year (26 = 2026), the next two the country of departure (PL = Poland). Always record the MRN for every T1 you open — it's essential for resolving any issues.

What Happens if a Transit Is Not Discharged?

If the office of destination does not confirm receipt within the time limit, NCTS triggers an enquiry procedure. The principal must provide proof of arrival. If they cannot, customs assesses the full suspended duties and VAT — payable immediately by the guarantor.

Common reasons for failed discharge:

• Driver went to the wrong customs office
• Authorised consignee forgot to close the transit electronically
• Goods delivered but paperwork not presented to customs
• Transit time limit expired due to delays
• TAD lost and MRN not recorded

SENT System — Poland-Specific Requirement

For shipments transiting through or delivering to Poland, the SENT (Electronic Monitoring of Road Transport) system requires registration of certain goods — including fuel, alcoholic beverages, tobacco, and other sensitive goods. The carrier must register in SENT and the driver must carry a SENT reference number. This is separate from T1 and failure to comply results in substantial fines.

AEO Status and Simplified Procedures

Freight forwarders with Authorised Economic Operator (AEO) status can access:

• Comprehensive guarantee reduction or waiver
• Authorised Consignee/Consignor status
• Reduced customs controls

Common T1 Mistakes

1. Wrong office of destination — The transit cannot be discharged at a different office than declared.
2. Seal broken in transit — Treated as if goods went missing. Full duties assessed.
3. Transit time limit exceeded — Contact the office of departure proactively for an extension.
4. Driver does not carry the TAD — Must be in the cab at all times. Digital copies not sufficient in all countries.
5. Forgetting to close the transit — Especially with Authorised Consignees. Always close the same day.
6. Incorrect goods description or weight — T1 must match the commercial invoice and CMR exactly.

T1 and the CMR Waybill

The T1 and CMR are separate documents serving different purposes. Both must be present. The T1 reference (MRN) should be noted in Box 5 of the CMR (documents attached) to link the two documents.

Pre-Departure Checklist

• T1 declaration lodged in NCTS and MRN received
• TAD printed and given to driver
• MRN recorded by the freight forwarder
• Guarantee reference valid and sufficient
• Office of destination confirmed and correct
• Transit time limit noted — driver aware of deadline
• MRN referenced in CMR Box 5
• SENT registration completed if transiting Poland with sensitive goods
• Driver briefed: do not break seals, carry TAD, present at correct customs office