Step-by-Step Guide to CDS Import Declarations in 2026

What Is the Customs Declaration Service (CDS)?

The Customs Declaration Service, commonly known as CDS, is HMRC’s modern platform for processing import and export declarations in the United Kingdom. Since the full transition from the older CHIEF system, CDS has become the primary gateway for traders bringing goods into the UK. Whether you are a seasoned importer or filing your first declaration, understanding the CDS workflow is essential for smooth customs clearance in 2026.

According to GOV.UK guidance, all UK import declarations must now be submitted through CDS. The platform integrates with the Government Gateway and offers a more flexible data model than its predecessor, supporting a wider range of trade scenarios including simplified procedures and special regimes.

Step 1: Register and Set Up Your CDS Account

Before submitting any declaration, you need a valid EORI number starting with GB, linked to your Government Gateway account. If you have not registered yet, you can apply through the HMRC EORI service. Once your EORI is active, you must subscribe to CDS via your Government Gateway dashboard. This step authorises your account to interact with the CDS platform directly or through third-party software.

Many businesses choose to work with a licensed customs broker such as agencjacelna.uk to handle declarations on their behalf. If you appoint an agent, ensure they hold the correct authorisation and that a standing authority or direct representation arrangement is in place.

Step 2: Gather the Required Documentation

A successful CDS import declaration depends on accurate supporting documents. Before you begin, ensure you have the following ready:

• Commercial invoice — detailing goods, value, seller, and buyer information
• Packing list — weights, dimensions, and package counts
• Bill of lading or airway bill — proof of transport arrangement
• Commodity codes — the correct tariff classification from the UK Trade Tariff
• Certificates or licences — if goods are subject to sanitary, phytosanitary, or other controls

Step 3: Complete the Declaration Data Elements

CDS uses a structured set of data elements (DEs) grouped into headers and item levels. Key fields include:

• DE 1/1 – Declaration type: typically IM for imports
• DE 1/2 – Additional declaration type: A (standard), C (simplified), or Y (supplementary)
• DE 2/1 – Previous documents: references to entry summary declarations or transit documents
• DE 4/16 – Valuation method: usually method 1 (transaction value)
• DE 6/14 and 6/15 – Commodity codes: the 10-digit tariff classification

HMRC provides the CDS Declaration Completion Instructions with detailed guidance on each data element. Getting these right first time avoids costly delays and potential duty miscalculations.

Step 4: Submit and Monitor Your Declaration

Once all data elements are populated, submit the declaration through your CDS-compatible software or via your broker. CDS will validate the data and return one of several response codes:

• Accepted — goods may be cleared subject to any documentary or physical checks
• Held — additional information or inspection required by Border Force
• Rejected — errors in the declaration that must be corrected and resubmitted

You can track the status of your declarations in real time through the CDS dashboard. For businesses handling high volumes, integrating CDS with internal ERP systems via the CDS API can streamline the process significantly.

Common Pitfalls to Avoid in 2026

Even experienced traders encounter issues with CDS declarations. Here are the most frequent mistakes to watch out for:

• Incorrect commodity codes — misclassification can lead to overpayment or underpayment of duty, both of which attract HMRC scrutiny
• Missing preference claims — if your goods qualify for a preferential duty rate under a UK free trade agreement, you must declare this with the correct document codes
• Valuation errors — failing to include freight, insurance, or royalty payments in the customs value
• Late supplementary declarations — if using simplified procedures, supplementary declarations must be submitted within the prescribed timeframe

Getting Professional Support

CDS import declarations can be straightforward for simple consignments, but complexity increases rapidly with special procedures, temporary imports, or goods subject to trade remedies. Working with a specialist customs broker saves time and reduces the risk of penalties. You can submit your clearance request quickly via easyclearance.pl — our digital platform designed for fast, accurate processing.