How to Submit a Customs Declaration in the UK - What a Company Needs Before Starting

A customs declaration in the UK doesn't start with a click in a system - it starts with getting your data, responsibilities and documents in order. In practice, many companies don't struggle with the name of the procedure itself, but with the declaration being fed incomplete or inconsistent information: a poor description of the goods, no clear importer role, an unresolved EORI question, or uncertainty about who is submitting the declaration.

This article shows what a company needs before it starts, and where mistakes on UK declarations most often occur.

Where a UK customs declaration starts

Official GOV.UK guidance shows that before submitting a declaration, you need access to the Customs Declaration Service, the right EORI number, and the full set of data needed for the declaration. Depending on the operating model, a company may submit declarations through software, use an agency's services, or, in certain cases, use available simplified procedures.

What to prepare before submitting a declaration

• the EORI number of the correct entity,
• an accurate description of the goods and their tariff code,
• value, quantity and commercial data,
• who is the importer or exporter,
• the commercial and transport documents needed for the declaration.

When companies make the most mistakes

1. When the declaration is meant to be "done quickly", but nobody has closed out the input data beforehand.
2. When the team doesn't know who is formally submitting the declaration and whose EORI should be used.
3. When the invoice, the packing list and the declaration data don't match each other.
4. When the company treats the declaration as the final step, rather than as the result of a well-prepared process.

Should you submit the declaration yourself, or use an agency?

This depends on the scale of your operation, your team's experience, and whether the company has ready processes for working with CDS. In practice, many companies use an agency because mistakes at the declaration stage cost far more than sorting out the documents beforehand.

Also see this video

This material does a good job of explaining the logic behind a UK customs declaration, and shows why correct input data matters more than the tool itself.

Frequently asked questions

Can a declaration be submitted without an EORI number?
In practice, the EORI question needs to be settled before you start work on the declaration.

Does every company have to work on CDS itself?
No. Many companies outsource declarations to an agency, but they still need to provide correct data and documents.

When is the best time to start preparing a declaration?
At the stage of gathering documents and settling responsibility - not just before the goods move.

Official sources

• GOV.UK: Subscribe to the Customs Declaration Service
• GOV.UK: Make and manage an export declaration online
• GOV.UK: Making a full export declaration
• GOV.UK: Making an import declaration in your records

If you want to get your documents in order more broadly

If the declaration is only the final stage of a bigger process, this article can also help: PL-UK export documentation - a complete checklist.

Related guides

• How to get an EORI number in the United Kingdom
• Customs clearance for importing into the UK - step by step
• Exporting to the UK - who is responsible for clearance and documents

Summary

A UK customs declaration is the result of a well-prepared process, not a quick form to fill in at the end. If you'd like to check what's missing from your data and documents before you submit a declaration, get in touch with us.

Key intent: customs declaration in the UK

This article answers the question customs declaration in the UK and shows how to work through the topic step by step, without unnecessary corrections or operational delays.

Additional official source

• https://www.gov.uk/guidance/making-a-full-import-declaration