eCOC in the UK: How the Electronic Certificate System Differs After Brexit

Last updated: July 2026

If you import vehicles into or out of the UK, the electronic Certificate of Conformity adds a second set of rules to keep track of. The EU moved to electronic COCs on 5 July 2026 — and the UK is building its own system alongside it, similar in structure but not identical.

Here is what actually differs, and what it means if you are registering a vehicle on either side of the Channel.

The EU side, briefly

Under Regulation (EU) 2018/858, manufacturers must make the Certificate of Conformity available to approval authorities as structured data in electronic format from 5 July 2026. It is XML data exchanged between manufacturers and authorities — not a document issued to the vehicle owner.

Member States agreed a transitional arrangement at the European Commission's Motor Vehicles Working Group meeting on 6 May 2026, allowing paper certificates or eCOC print-outs until 29 November 2026 at the latest, where national infrastructure was not ready in time.

The UK system: same foundation, different file

The UK is implementing its own digital service through the Vehicle Certification Agency (VCA), and the detail matters if you handle paperwork professionally.

It is built on the EU's IVI file. UK electronic eCOCs are based on the Initial Vehicle Information file developed for the EU eCOC system — same structure, same content, with additions that carry GB and UKNI approval information. Files are submitted in XML format.

The approval authority codes differ. Where an EU certificate carries a Member State authority code, UK files use codes such as g11 or n11 across various fields to identify GB and UKNI approvals.

The content is not the same as UK paper COCs. The structure and content of UK electronic certificates differ from what GB type-approval legislation prescribes for paper certificates — so a UK eCOC is not simply a digitised version of the paper document.

Scope and phasing. Vehicles in categories M, N and O approved under the GB or UKNI type-approval schemes fall within the first phase of the VCA service.

The point most people miss

There is no obligation to submit eCOC data for vehicles manufactured before 5 July 2026.

That single line covers the overwhelming majority of vehicles anyone is importing, buying or registering today. If your vehicle rolled off the line before that date — and almost every used vehicle did — the electronic system does not apply to it. You need a Certificate of Conformity in the traditional sense, issued against your VIN.

What this means in practice

Importing a used EU car into the UK: unchanged. You still need the COC to prove the vehicle's European type approval, alongside customs and VAT paperwork.

Taking a UK vehicle to an EU country: unchanged for existing vehicles. The eCOC obligation sits with manufacturers of newly produced vehicles, not with owners.

Handling new vehicles professionally: this is where the divergence bites. A vehicle approved under a GB or UKNI scheme produces a different electronic file from one approved under an EU scheme — worth understanding if you move volume across the border.

Frequently asked questions

Does the UK use the same eCOC as the EU? Not identically. The UK system is based on the EU's IVI file structure but includes GB and UKNI specific approval information, with distinct authority codes such as g11 and n11.

My car was built in 2019 — does any of this apply? No. There is no obligation to submit electronic COC data for vehicles manufactured before 5 July 2026.

Can I download my vehicle's eCOC? No. It is structured data exchanged with authorities, not an owner-facing document.

Do I still need a Certificate of Conformity to register an import? Yes — for existing and used vehicles, the traditional COC remains the document that proves type approval.

When does the EU transitional period end? 29 November 2026 at the latest.

Get the certificate you actually need

Whatever happens to the digital infrastructure, importing a used vehicle still comes down to one document: an official Certificate of Conformity matched to your VIN. 321COC supplies official EU-compliant certificates for many brands online, with transparent pricing, secure checkout, fast delivery and money-back protection.

Currently available COC online on 321COC:

Implementation details on both sides are still developing. Confirm current requirements with the relevant authority before your registration appointment.