CDS vs CHIEF system – revolution in UK customs. What you need to know? [2026]

For 30 years, British customs was operated by the system CHIEF (Customs Handling of Import and Export Freight). It was old, text-based ("green screen"), but everyone knew it. From 2024 CHIEF is history (for import and export). It has been fully replaced by CDS (Customs Declaration Service).

For the Polish exporter this change may seem technical but has a real impact on how quickly your goods enter the UK.

Why was the system changed?

CHIEF was designed in the 1990s, before e-commerce existed and when the UK was in the EU. It could not handle:

• A huge number of declarations after Brexit.
• The new Union Customs Code (UCC), which (paradoxically) also underpins UK law.

CDS is a modern system compliant with global standards based on "Data Elements" instead of the old "Boxes" from the SAD form.

Key differences for the entrepreneur

1. Other procedure codes

If you are used to the old procedure codes from CHIEF, CDS uses different ones. Customs agencies had to learn the "customs language" anew.

2. Payment methods (Cash Account vs Deferment)

The method of paying duty and VAT is changing in CDS.

• Your Deferment Account must be authorised in the new CDS financial dashboard.
• If your agency has not "linked" your account in CDS, you will not pay customs duty and the goods will be held.

3. More data

CDS requires more detailed data than CHIEF.

• More precise document codes.
• More detailed information on the relationships between seller and buyer (Valuation Methods).

Myths about CDS

"CDS is just an IT change"* – False. It is a change in customs logic. Many declarations accepted in CHIEF are rejected in CDS due to missing data. "My Polish EORI is sufficient"* – No. CDS strictly requires EORI GB numbers.

What must a Polish company do?

If you sell on terms DDP (i.e. you import in the UK) or have a company in the UK: 1. Register for CDS – On the Government Gateway portal you must subscribe to the CDS service. 2. Set payment methods – In the Financial Dashboard in CDS, grant authorisations to your customs agency to use your deferral account. 3. Check commodity codes – CDS is more sensitive to incorrect HS codes.

Teething problems

Like any new government system, CDS experiences outages. Downtime occurs more frequently than with the old CHIEF system. It is advisable to monitor HMRC system availability announcements, especially when planning urgent deliveries.

Summary

CDS is the new reality. The "old days" are gone. Ensure your UK customs agent is proficient in CDS, as errors in "Data Elements" result in "Held" status at the border.

What the current official guidance means in practice

For operational work, the current procedural rules, declaration fields and relief conditions should be checked directly against the official guidance. For this topic, the core reference points are European Commission, GOV.UK / HMRC.

Official sources

• EU Commission (Customs procedures) — European Commission, 2026-03-04
• UK GOV (Importing into the UK) — GOV.UK / HMRC, 2026-03-04
• GOV.UK: Customs Declaration Service — GOV.UK / HMRC, 2026-03-04