Step-by-Step: How Customs Clearance Works in the UK, 2026 Update

If you are importing or exporting goods into or out of the United Kingdom, customs clearance is a process you simply cannot afford to misunderstand. Since Brexit fundamentally reshaped the UK’s trading relationship with the European Union and the rest of the world, the customs landscape has undergone years of phased changes, transitional arrangements, and regulatory overhauls. Now, in 2026, the dust has largely settled. The UK’s Border Target Operating Model (BTOM) is fully operational, the Customs Declaration Service (CDS) has long since replaced the legacy CHIEF system, and businesses are expected to be fully compliant with the current framework.

Whether you are a seasoned logistics professional or a small business owner shipping products internationally for the first time, this step-by-step guide will walk you through exactly how customs clearance works in the UK in 2026.

Step 1: Determine Whether Your Goods Require a Customs Declaration

Not every movement of goods triggers a full customs clearance procedure, but the vast majority do. As a general rule, any goods crossing the UK border from outside the UK customs territory — which includes Great Britain and Northern Ireland, though Northern Ireland operates under the unique Windsor Framework arrangements — will require a customs declaration.

Goods moving between Great Britain and Northern Ireland are subject to specific rules under the Windsor Framework. “Not at risk” goods moving from GB to NI benefit from simplified processes through the UK Internal Market Scheme (UKIMS), while goods deemed “at risk” of entering the EU single market may face full EU tariffs and checks. Understanding which category your goods fall into is the essential first step.

Step 2: Classify Your Goods Using the Correct Commodity Code

Every product that crosses a border must be classified under a specific commodity code — a numerical identifier drawn from the UK Global Tariff (UKGT). In 2026, the UKGT continues to be the definitive reference for determining duty rates, licensing requirements, and any restrictions that may apply to your goods.

Getting the commodity code wrong is one of the most common — and most costly — mistakes importers make. An incorrect classification can lead to overpayment or underpayment of duties, delays at the border, and even penalties from HM Revenue & Customs (HMRC). The UK Trade Tariff tool, available on the GOV.UK website, remains the primary resource for finding the correct code. If your product is complex or unusual, consider seeking a Binding Tariff Information (BTI) ruling from HMRC for legal certainty.

Step 3: Determine the Customs Value of Your Shipment

Customs duties and import VAT are calculated based on the customs value of your goods. In most cases, this is the transaction value — the price actually paid or payable for the goods when sold for export to the UK, plus certain additional costs such as shipping, insurance, and packing charges up to the point of entry into the UK.

HMRC recognises six methods of valuation, applied in hierarchical order. The transaction value method is by far the most common, but if it cannot be used — for example, in the case of gifts or goods transferred between related companies at non-arm’s-length prices — you will need to work through the alternative methods. Accurate valuation is critical, as undervaluation is treated seriously by HMRC and can result in significant fines.

Step 4: Check Rules of Origin and Applicable Trade Agreements

The UK has rolled over and negotiated numerous free trade agreements (FTAs) since leaving the EU, including deals with the EU, Japan, Australia, New Zealand, and the CPTPP bloc, which the UK formally joined in 2024. Each agreement has its own rules of origin, which determine whether your goods qualify for preferential (reduced or zero) tariff rates.

To benefit from preferential tariffs, you must be able to prove that your goods originate in the relevant partner country. This typically requires a statement on origin from the exporter or, in some cases, importer’s knowledge supported by appropriate documentation. In 2026, HMRC continues to tighten its verification processes, so maintaining robust origin records is more important than ever.

Step 5: Gather and Prepare All Required Documentation

A smooth customs clearance depends heavily on the quality and completeness of your paperwork. The core documents you will typically need include:

• Commercial invoice detailing the description, quantity, value, and terms of sale.
• Packing list specifying the contents of each package.
• Bill of lading or air waybill serving as the transport document.
• Certificate of origin or statement on origin, if claiming preferential tariffs.
• Import licences or certificates, where applicable (for example, for controlled goods, agricultural products, or goods subject to sanitary and phytosanitary controls under the BTOM).
• Safety and security declarations, which are now mandatory for most imports into Great Britain.

Missing or inaccurate documents are the single biggest cause of clearance delays. Double-check everything before submission.

Step 6: Submit Your Customs Declaration via the Customs Declaration Service (CDS)

The CHIEF system is now firmly in the past. All customs declarations in the UK must be submitted through CDS, HMRC’s modern, digital platform. CDS supports a wider range of data elements and declaration types than its predecessor and integrates with the broader Single Trade Window initiative that the UK government has been developing to streamline border processes.

You can submit declarations yourself if you have the appropriate software and an EORI (Economic Operators Registration and Identification) number, or you can appoint a customs agent or freight forwarder to act on your behalf. Most businesses, particularly SMEs, choose to use an agent to navigate the complexities of CDS and ensure compliance.

Step 7: Pay Import Duties and VAT

Once your declaration is processed, HMRC will calculate the duties and import VAT owed. Duty rates vary depending on the commodity code and the origin of the goods. Import VAT is generally charged at the standard rate of 20%, though reduced rates apply to certain categories.

Many businesses use a Duty Deferment Account (DDA) to consolidate payments and pay HMRC on a monthly basis rather than per shipment. This can significantly improve cash flow and speed up the release of goods. Alternatively, Postponed VAT Accounting (PVA) allows UK VAT-registered importers to account for import VAT on their VAT return rather than paying it at the border, a major cash-flow advantage that remains available in 2026.

Step 8: Border Checks and Physical Inspections

Under the fully implemented BTOM, the UK operates a risk-based approach to border controls. This means that while many consignments pass through without physical inspection, a proportion will be selected for documentary checks, identity checks, or full physical examinations. Goods subject to sanitary and phytosanitary (SPS) controls — such as food, plants, and animal products — face the highest level of scrutiny and may need to pass through designated Border Control Posts (BCPs).

The BTOM’s risk-based model means that trusted traders with a strong compliance record are less likely to face disruptive checks, providing a strong incentive to invest in compliance and consider schemes such as Authorised Economic Operator (AEO) status.

Step 9: Release of Goods

Once all checks are satisfied, duties and VAT are paid or accounted for, and HMRC is satisfied that the declaration is accurate, your goods will be released for free circulation in the UK. At this point, they can be delivered to their final destination.

 

Final Thoughts

Customs clearance in the UK in 2026 is a structured, digital-first process that rewards preparation and penalizes shortcuts. The regulatory environment is now stable after years of post-Brexit transition, but the complexity remains significant. Invest in accurate classification, maintain meticulous records, leverage technology and trusted trade schemes, and do not hesitate to work with experienced customs professionals. Getting clearance right is not just about compliance — it is about keeping your supply chain moving, your costs predictable, and your customers satisfied.