Import customs clearance works by moving a shipment through a series of compliance checks and declarations before goods can legally enter the UK. Each step must be completed accurately and in the right order, against regulations that change regularly. For businesses without dedicated customs expertise, keeping pace with those changes while managing day-to-day operations is where mistakes happen and where the financial cost begins to accumulate.

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Here's a step-by-step breakdown of exactly how import clearance works:

1. Obtain an EORI number: An Economic Operator Registration and Identification (EORI) number starting with GB is required to import goods into Great Britain. It must be registered with HMRC and appear on all customs declarations. Without one, clearance cannot begin.

2. Determine commodity codes: Every item must be classified with the correct commodity code from the UK Trade Tariff. This determines the applicable duty rate, VAT treatment, and any import restrictions. Commodity codes and the rules governing them are subject to change, and businesses are expected to apply the correct code at the time of declaration. Incorrect classification is one of the most common and costly mistakes in import clearance. HMRC has the authority to reassess duty and apply penalties where errors are identified, including retrospectively.

3. Prepare documentation: The core documents required are a commercial invoice, packing list, and transport document (Bill of Lading or Air Waybill). Where goods are controlled or restricted, supporting licences or certificates must be secured before the shipment arrives. Documentation requirements evolve as regulations change, and what was sufficient for a shipment six months ago may not meet current HMRC standards. Incomplete or inaccurate paperwork at the border is a leading cause of delays and avoidable storage charges.

4. Submit an import declaration: The import declaration is submitted electronically through HMRC's Customs Declaration Service (CDS), covering the shipment details, origin, customs value, and applicable procedure. It can be submitted by the importer directly or by an appointed customs agent. Declarations must be filed within defined timeframes and must reflect current procedural requirements. Late or non-compliant submissions can result in penalties.

5. Pay duty and VAT: Import duty and VAT become payable once clearance is granted. Rates are determined by the commodity code and country of origin, and are subject to change through updates to the UK Global Tariff and trade agreements. Goods valued under £135 are generally not subject to customs duty, though this relief is due to be removed by March 2029. VAT-registered businesses may be eligible for postponed VAT accounting (PVA), allowing import VAT to be reported through the VAT return rather than paid at the point of import.

6. Receive clearance and arrange delivery: Once HMRC has assessed the declaration and applicable charges are settled, goods are released. Where documentation is complete and accurate, clearance can be achieved within a few hours. Shipments selected for inspection or where queries arise typically take between one and seven working days. The accuracy of the declaration is the single greatest factor in how quickly goods are released.

UK customs regulations is constantly changing, and businesses are expected to keep pace regardless of whether they have the resource in-house to do so. Tariff rates, documentation requirements, classification rules, and compliance procedures change regularly.

For many businesses, the cost of falling behind is big. Incorrect declarations, missed regulatory updates, and classification errors translate directly into financial loss, through penalties, overpaid or underpaid duty, delayed stock, and disrupted supply chains. For businesses managing compliance alongside everything else, without dedicated customs expertise to absorb that change, the exposure is significant. Choosing the right support can help.