NCTS phase 5: what changes for customs transit, who must adapt, and by when

The New Computerised Transit System (NCTS) is the trans-European electronic system through which customs transit is declared, monitored and discharged. It carries two procedures: Union transit, for movements within the customs territory of the EU under Title VII, Chapter 2 of the Union Customs Code (Regulation (EU) No 952/2013), and common transit, for movements involving the contracting parties to the Convention of 20 May 1987 on a common transit procedure — according to the European Commission these include the EFTA states (Iceland, Norway, Switzerland, Liechtenstein), Türkiye, North Macedonia, Serbia, the United Kingdom, Ukraine, Georgia, Moldova and Montenegro. Transit temporarily suspends the duties, taxes and commercial policy measures that would apply at import while the goods move under customs supervision. On acceptance of a transit declaration, NCTS assigns a Master Reference Number (MRN), under which the movement is followed until it is discharged at destination. Electronic handling is not a service option but a legal default: Article 6(1) UCC requires all exchanges of information between economic operators and customs authorities to be made using electronic data-processing techniques.

The UCC work programme — Commission Implementing Decision (EU) 2019/2151, since replaced by Decision (EU) 2023/2879 — defines the upgrade precisely. Phase 5 aligns NCTS with the UCC requirements 'except in safety and security data elements': the content of the transit declaration follows UCC data requirements, 'en route' events are registered in the system, and the interfaces between NCTS and other customs systems were upgraded and extended. The 2023 programme allowed deployment in two steps: first the core functions that keep transit operational — standard declarations, simplified procedures, diversion, inquiry and recovery — and then the remaining functionality. The analytical point for compliance owners is that phase 5 did not change the nature of the transit procedure (suspension, guarantee and discharge work as before), but it did change the message set, the required data elements and the digital visibility of the journey: incidents and deviations during transport are now recorded as structured system events.

Deployment ran on a window model, in which national administrations switch over within a collectively agreed period; phase 5 replaces a phase 4 environment that had been in production since 2009. The 2019 work programme opened the phase 5 deployment window on 1 March 2021 and originally had it closing on 1 December 2023. The revised work programme of December 2023 (Decision (EU) 2023/2879) split deployment into two steps — step 1 by 1 December 2023, step 2 by 2 December 2024 — with a transition period running until 21 January 2025. The European Commission's NCTS page confirms 2 December 2024 as the full deployment date for phase 5. Those dates now lie in the past: businesses moving goods under transit should assume that the phase 5 message set and data requirements are the operative standard across the EU and the common transit countries, and treat any residual national exception as a question for the customs administration concerned.

The upgrade lands with anyone who exchanges messages with NCTS. That most likely includes a business if it places goods under transit as holder of the procedure, lodges declarations for clients as freight forwarder or customs agent, operates under transit simplifications, or carries the goods and must have incidents en route reported. Adapting means three things in practice: software that supports the phase 5 message set (via a vendor, a service provider or a direct connection to the national transit application), source data that can populate the UCC-aligned data elements correctly and completely, and working procedures that get en route events reported promptly and accurately. Because Article 6(1) UCC makes electronic exchange the rule, a structural paper alternative does not exist; the exact obligations per role and per country follow from national implementation, so verification with the national customs administration remains necessary.

Phase 5 deliberately excluded one block: safety and security data. That block is phase 6. Under Decision (EU) 2023/2879, NCTS phase 6 implements the safety and security data elements in transit declarations for goods brought into the customs territory of the Union, resulting from the ICS2 project, with a deployment window from 3 March 2025 to 1 September 2025. According to the Commission, as of 1 September 2025 entry summary declaration (ENS) particulars may be provided in combination with a transit declaration for road and rail movements, replacing two separate filings in two systems. Actual rollout is running per country into 2026: the Commission reports deployments in spring 2026 (Belgium and Andorra on 1 April 2026, Slovakia in March 2026) alongside temporary derogations for some countries until 31 December 2025 or 1 June 2026. If transit movements enter the EU by road or rail from outside the customs territory, the transit declaration will likely need to carry ENS data — the timing depends on the country where the goods enter.

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