How To Submit a UK Import Declaration (CDS): Step-By-Step Guide

UK Import Declaration A customs declaration submitted for goods imported into the UK, containing classification, value, origin, procedure, and other entry information.

This entry focuses on the operational steps used to prepare and submit an import declaration through the UK Customs Declaration Service (CDS). For most commercial imports into the UK, CDS is the electronic channel through which importers or their agents transmit the data HMRC needs to clear goods. The steps below assume the importer has an EORI number and access to a compatible software provider or a customs agent who uses CDS.

Pre-Filing Preparation

Before filing, gather the documents and data that feed the declaration:

• Commercial Invoice: Supplier and buyer names, full description, quantity, unit and total value, INCOTERM, currency and payment terms.
• Packing List: Weights, dimensions, and packaging details for release and risk assessments.
• Transport Documents: Bill of lading, air waybill, or road consignment note and voyage/flight numbers.
• Origin Proof: Supplier declarations or certificates for preferential duty claims or quota management.
• EORI & Authorisations: Importer EORI and any authorisations (duty deferment, simplified declarations).

Filing The Declaration In CDS

Filing an import declaration typically follows these steps in CDS:

• Create A New Entry: Initiate an import entry in CDS or instruct your customs agent to do so, providing import and transport references.
• Enter Commodity Lines: For each product line provide HS code, description, quantity, gross/net weight and value.
• Specify Origin And Procedure: Declare the country of origin and select the customs procedure code—home use, inward processing, temporary admission, etc.
• Attach Documents: Reference or attach supporting documents such as supplier declarations, licences, or certificates required for controlled goods.
• Submit And Receive MRN: Submit the declaration; CDS validates the data and, on acceptance, issues a Movement Reference Number (MRN) authorising customs movement or release procedures.

Payment And Post-Entry Actions

Duties and import VAT must be settled. Payment options include immediate payment at the port or using a duty deferment account if the importer holds authorisation. After entry, keep documentation and respond promptly to any HMRC queries. Amendments to declarations are possible but should be handled quickly to avoid penalties.

When To Use A Customs Agent Or Software Provider

Many businesses outsource filing because declarations require correct tariff classification and handling of reliefs and licences. Use a licensed customs intermediary if you lack in-house expertise or when dealing with controlled goods (food, chemicals, textiles with quotas). Software providers can automate validation against tariff and regulatory rules to reduce rejection rates.

Common Filing Errors And How To Avoid Them

Common mistakes that trigger delays include incorrect HS codes, mismatched invoice amounts, missing origin documents, and incorrect consignee EORI. To reduce errors:

• Pre-Validate: Use tariff lookup tools and automated validation before submitting to CDS.
• Standardise Templates: Ensure invoices and packing lists contain consistent SKU identifiers and measurements.
• Communicate With Carriers: Confirm transport references and arrival times so the MRN aligns with the physical movement.
• Recordkeeping: Keep digital copies of all supporting documents in case HMRC requests them.

Example Workflow

An e-commerce merchant imports a pallet of textile goods by sea. The freight forwarder books the container and collects the commercial invoice and supplier origin declaration. The customs broker creates a CDS import entry with commodity lines for each SKU, applies a preferential tariff based on supplier proof of origin, and uses the merchant's deferred payment authorisation to account for duties. The MRN is issued, the carrier presents arrival documentation, and the goods clear port storage within 24 hours.

In short, the UK Import Declaration submitted through CDS is an essential, data-rich submission; careful pre-filing preparation, accurate commodity data, and the right commercial arrangements minimise border delays and compliance risk.