CDS Customs Declaration Service UK 2026 – Full Guide

What is CDS — definition and context

CDS (Customs Declaration Service) is HMRC's electronic system for submitting customs declarations in Great Britain. It handles import, export, transit, warehousing and all special procedures (customs warehousing, inward processing, temporary admission). Every import or export of goods crossing the UK border requires a CDS declaration — without one, goods cannot be legally released to free circulation or loaded onto a vehicle leaving the country.

The system was designed by HMRC and CDIO (Chief Digital and Information Office) as the successor to CHIEF — a system from 1989 that simply could not keep up with modern post-Brexit declaration volumes. CDS is built on cloud architecture (AWS), based on UCC (Union Customs Code) and WCO Data Model 3 standards, making it compatible with EU customs systems and global equivalents.

Why CDS was built

HMRC decided to build CDS as far back as 2013, well before Brexit, for three main reasons:

• Scale — CHIEF handled around 55 million declarations per year, but after Brexit this figure jumped to 400+ million. The old mainframe simply could not handle the load.
• Standardisation — the UCC requires harmonised data structures that CHIEF could not support architecturally (e.g. multiple procedures within a single declaration).
• Border digitalisation — CDS is the foundation for the Single Trade Window (STW), the planned "one-stop-shop" platform for 2027 that will connect HMRC, Border Force, Defra and all border agencies.

CDS vs CHIEF — key differences

Migrating from CHIEF to CDS was not a cosmetic update — it was a complete rewrite of the system, with new data structures, new logic and a new interface.

The most significant change for customs brokers was the new procedure code system. In CHIEF, a single 7-digit CPC described the entire operation (e.g. 4000000 — standard import to free circulation). In CDS, the same operation requires a combination of a 4-digit Procedure Code (e.g. 4000) and a 3-digit Additional Procedure Code (e.g. 000). It sounds similar, but in practice a single CHIEF CPC often maps to 5–10 different CDS combinations depending on context.

CHIEF to CDS migration timeline

The migration lasted over five years and was one of HMRC's largest digitalisation projects in its history.

• 2018 — CDS launches in pilot phase for selected import declarations (rolled out by commodity type).
• 2021 — first announced date for definitive CHIEF switch-off (subsequently delayed multiple times).
• 30 September 2022 — CHIEF switched off for import declarations. From this date all UK imports must be declared in CDS.
• 31 March 2023 — original date for export switch-off (postponed).
• 30 March 2024 — final switch-off of CHIEF for export declarations. CHIEF retired after 35 years of service.

For Polish exporters and logistics companies this means that in 2026, all work is done exclusively in CDS. Every UK customs broker, including Easy Clearance, has a CDS profile and submits declarations on behalf of clients.

What declarations does CDS handle

CDS is a universal system — it handles virtually all types of customs declarations:

Import declarations

• H1 — standard import to free circulation (most common)
• H2 — entry to customs warehouse
• H3 — Temporary Admission
• H4 — Inward Processing
• H5 — entry to free zone
• H6 — simplified declaration for small B2C consignments (up to £135)
• H7 — Super Reduced Data Set for low-value goods (below €150)

Export declarations

• B1 — standard (permanent) export
• B2 — export after inward processing (re-export)
• B3 — export from customs warehouse
• B4 — export after Outward Processing
• C1 — re-export after Temporary Admission

Simplified and transit declarations

T1/T2 transit is handled in the separate NCTS Phase 5 system (integrated with CDS). Simplified declarations (SDP — Simplified Declaration Procedure) and entries in the declarant's records (EIDR — Entry In the Declarant's Records) operate as CDS modules available to authorised operators (typically AEO holders).

How to register for CDS — step by step

CDS registration is free and available to any business with an active GB EORI. The process typically takes 24–72 hours.

Step 1: Government Gateway Business Tax Account

Set up a business account on GOV.UK. If you already submit VAT or other returns to HMRC, you already have this account.

Step 2: Add CDS to your account

Log in to your Business Tax Account, click "Add a tax, duty or scheme" and select Customs Declaration Service. The system will ask for your GB EORI number and business address. After HMRC verification, CDS is added to your profile.

Step 3: Configure your payment method

In CDS you must choose how to pay duty and VAT:

• Cash Account — a new mechanism where you top up a balance held with HMRC and the system deducts duties automatically.
• Duty Deferment Account (DDA) — defers duty payment to the end of the month (requires a bank guarantee).
• Postponed VAT Accounting (PVA) — import VAT accounted for in your VAT return, with no physical payment at the border. The standard for most importers.
• Immediate Payment — payment by card or bank transfer for each individual declaration.

Step 4: Authorise your customs broker

If you use a broker (such as Easy Clearance), you must complete a standing authority form in the CDS portal, granting the broker the right to submit declarations on your behalf. The broker receives a notification and can begin submitting declarations under your EORI.

Integrating CDS with customs software

In practice, no customs broker submits declarations manually through the HMRC portal — it would be physically impossible with 100+ fields per declaration. Everyone uses specialist CSP software that connects to CDS via API.

Most popular CSP platforms in the UK

• Descartes — global leader, used by most large freight forwarders
• BoxTop Technologies — popular with smaller agencies
• ASM Sequoia — strong presence at container ports
• CCS-UK / Cargowise — used by international freight forwarders
• Pentant CustomsClear — UK-native, well-suited to smaller firms

CSP software automates validation, maps legacy CHIEF CPCs to new CDS Procedure Codes, integrates with client WMS/TMS systems and provides real-time declaration status tracking. Easy Clearance uses a next-generation platform that enables us to issue H1 declarations within minutes of receiving a complete document set.

CDS and GVMS — how they connect

GVMS (Goods Vehicle Movement Service) is a separate system responsible for authorising vehicle movement across the UK border (ports, Channel Tunnel). CDS handles the customs declaration content; GVMS handles the physical truck movement.

The workflow is as follows:

1. The broker submits a declaration in CDS — the system returns an MRN (Movement Reference Number).
2. The broker opens GVMS and creates a GMR (Goods Movement Reference), entering the MRNs for all declarations on that vehicle (one lorry can carry goods for five importers = five MRNs on one GMR).
3. The driver presents the GMR at the port — Border Force verifies that everything is paid and released.
4. After crossing the border, the GMR is discharged and CDS closes the corresponding declarations.

Without a correctly linked GMR, the lorry cannot board the ferry or enter the tunnel — the border point will turn it away. Cost of GMR issuance by a broker: from £15 to £30.

Interface differences — what CHIEF-experienced brokers will notice

Brokers who worked in CHIEF for 10–20 years had to undergo significant retraining. The most notable differences:

• No green screen — CHIEF operated in text mode (3270 terminal). CDS is a modern HTML5 portal.
• Live validation — CDS flags errors as you type; CHIEF only returned them after submission.
• Structured DE fields — each CDS field has a "Data Element" code (e.g. DE 2/1, DE 4/14), which requires adjustment.
• New code dictionary — many document codes (e.g. C400, N380) have different meanings in CDS compared to CHIEF.
• Real-time status — CDS shows whether a declaration is "Accepted", "Under Review", "Released" or "Detained" within seconds.

Most common CDS errors and how to avoid them

After two years of full CDS operation, HMRC reports that 30–40% of declarations contain some validation errors (vs. 15% in CHIEF). The most common causes:

1. Incorrect Procedure Code mapping

Brokers enter "4000" assuming it is the same as CPC "4000000" in CHIEF — and forget the Additional Procedure Code "000". The result: a formally incomplete declaration. Always verify the PC + APC pair in the UK Integrated Online Tariff.

2. Insufficient CDS Cash Account balance

If a client has no funds in their Cash Account, the declaration is held in "Pending payment" status — which at the border means the lorry is stopped. The standard practice is PVA for VAT and DDA for duty.

3. Incorrect document codes (Data Element 2/3)

CDS requires codes for accompanying documents (e.g. "N935" for an invoice, "C512" for a CHED certificate). A missing or incorrect code results in a rejected declaration.

4. Confusion between Declarant EORI and Importer EORI

CDS has two distinct fields: Declarant EORI (who submits) and Importer EORI (on whose behalf). Mixing them up leads to payment errors and VAT refund issues.

5. Missing GMR after CDS declaration

A classic error: the broker submits the CDS declaration but forgets the GMR in GVMS. The driver arrives at the border, but Border Force cannot see the vehicle in the movement system.

6. Wrong currencies and exchange rates

CDS uses HMRC monthly exchange rates published on GOV.UK. Using invoice-date rates instead of the HMRC monthly rate triggers a validation error.

Cost of CDS declarations through a broker

The CDS declaration itself is free from HMRC — the fee is charged by the customs broker for preparing, validating and submitting the declaration. Standard market rates in the UK:

Indicative ranges — exact pricing after documents are received. Price depends on the number of HS lines in the declaration, procedure complexity (standard vs. special), urgency (24/7 vs. standard) and supporting documents required (CHED, CITES, licences).

FAQ — frequently asked questions about CDS

Are CDS and CHIEF running in parallel?

No, not since 30 March 2024. On that date HMRC definitively switched off CHIEF for all declaration types (imports were switched off on 30 September 2022, exports on 30 March 2024). In 2026, all UK customs declarations go exclusively through CDS.

Can I register for CDS without a broker?

Yes, any business with an active GB EORI can access CDS. The challenge is that without specialist CSP software, completing a declaration manually takes 1–2 hours and requires knowledge of 100+ UCC data fields. Most businesses prefer to outsource to a broker for from £45 to £150.

What is the difference between a Cash Account and a Duty Deferment Account?

A Cash Account is a prepaid balance held with HMRC — you top it up and the system deducts duties automatically (like a prepaid account). A DDA is a bank-guaranteed account that defers duty payment to the 15th of the following month. DDA requires a bank guarantee; a Cash Account does not.

What is PVA and is it worth using?

PVA (Postponed VAT Accounting) is a mechanism where the importer accounts for import VAT in their VAT return (as both output and input VAT), rather than paying it physically at the border. For most importers PVA is the standard — it eliminates the cash flow burden of import VAT and requires no bank guarantee.

How long does CDS registration take?

The registration itself (via Government Gateway) takes 24–72 hours after EORI verification. Configuring the Cash Account and authorising a broker takes a further 1–3 days. In total, allow 5–7 working days from first login to readiness for the first declaration.

Does CDS handle simplified declarations?

Yes. CDS fully supports SDP (Simplified Declaration Procedure) and EIDR (Entry In the Declarant's Records) for authorised operators. This requires separate HMRC authorisation and typically AEO (Authorised Economic Operator) status.

What happens if my CDS declaration is rejected?

The system returns an error code (e.g. "CDS40023") with a description. The customs broker must correct the indicated field and resubmit. Most errors are typos or outdated document codes. If the error concerns classification (HS code) or value, correction may require contact with HMRC.

Current regulatory status

CDS is actively developed by HMRC — new Data Elements, procedure codes and integrations are released regularly. Always verify the latest HMRC guidance in the UK Integrated Online Tariff. The information in this article reflects the legal position as of April 2026.

Official sources

• GOV.UK: Customs Declaration Service collection — HMRC, 2026
• GOV.UK: CDS Finance Dashboard — HMRC, 2026
• UK Integrated Online Tariff — HMRC, 2026
• GOV.UK: Register for GVMS — HMRC, 2026