The Short Version
The Customs Declaration Service (CDS) is HMRC's current platform for submitting all UK import and export declarations. It fully replaced the older CHIEF (Customs Handling of Import and Export Freight) system — for imports in September 2022 and for exports in March 2024.
If you or your broker are still trying to lodge declarations via CHIEF, they will be rejected. Every UK customs movement now goes through CDS — without exception.
Why HMRC Made the Switch
CHIEF was built in 1989. It ran on a 1990s mainframe architecture and could not be reliably scaled, integrated with modern logistics platforms or updated to meet the post-Brexit volume of UK customs declarations (now well over 250 million per year).
CDS sits on a modern cloud platform, supports real-time integration with HMRC's other systems (VAT, Excise, Postponed VAT Accounting) and provides the audit trail required for the Trader Support Service and the Northern Ireland Protocol.
What Is Actually Different — From a Trader's Perspective
If you used CHIEF in the past and have not touched a customs declaration since 2022, here are the changes that affect you most:
1 — Declaration data is restructured. CDS uses the WCO Data Model — declarations are organised into 8 logical "data sets" rather than CHIEF's flat field structure. Most of the data is the same, but the field references are different. Your broker has to remap their templates.
2 — Postponed VAT Accounting (PVA) is built in. Under CHIEF, PVA was an opt-in choice declared on the entry. Under CDS, it is configured at the importer's CDS account level. Most importers benefit by switching to PVA — it removes the cash-flow drag of paying import VAT and reclaiming it months later.
3 — Method of Payment changes. CDS uses Cash Account, Duty Deferment, Immediate Payment, Guarantee or PVA. The codes and registration process are different from CHIEF's. If your duty deferment account number is GB123, you have to re-link it inside CDS.
4 — Document codes are new. Many CHIEF document codes (Y, U, X prefixes) have been replaced by full UK NPA (Numerical Procedure Allocation) codes. A misclassified document will trigger a rejection.
5 — Real-time validation. CDS validates declarations as you submit. Errors come back in seconds, not hours. Good for speed, but it means typos that CHIEF would have let through now generate immediate failures.
What You Need to Do
If you have not yet registered for CDS, do it now. The registration takes about 10 minutes:
- Sign in to your Government Gateway account
- Go to gov.uk/guidance/get-access-to-the-customs-declaration-service
- Add the CDS service to your business tax account
- Subscribe — this links your EORI to CDS
You should also:
- Link your Duty Deferment Account (DDA) to CDS. Even if it was registered for CHIEF, it needs to be re-linked.
- Decide on Postponed VAT Accounting. Most importers should opt in. The decision is made per-import, but easier if you default to PVA in your CDS profile.
- Download your monthly PVA statements. CDS provides them in your business tax account by the 6th working day of each month. You use these to reclaim import VAT on your VAT return.
- Update your customs broker. If your existing broker still references CHIEF, you need a new one. Every legitimate UK customs broker has been CDS-only since 2024.
Common Migration Mistakes
The most common mistakes we see from businesses moving over from CHIEF:
- Using the old "G" Method of Payment code. It does not exist in CDS — use one of the five new ones.
- Forgetting to link the DDA. You will see "deferment not recognised" errors until you re-link.
- Mismatched EORI on PVA statements. If your EORI was created for CHIEF and not subscribed to CDS, PVA statements will not generate.
- Not testing. Lodge a low-value test declaration through CDS before your first real shipment. Get the rejection cycle out of the way on something you can afford to retry.
If You Need Help
Migrating from CHIEF to CDS is not difficult — but the first declaration is when most of the problems surface. If you would rather not absorb that learning curve on a live shipment, we can manage the full transition: CDS registration, DDA linking, PVA opt-in and the first few live declarations under supervision.
Get in touch on customs@pcsl.uk.com or +44 1480 470 114.