The most common mistakes made by UK importers are incomplete documents, the wrong commodity code, missing out on TCA preferences, a product that does not meet UK requirements, and underestimated import costs. Any of them can lead to a delay, an extra charge or goods being held — here is how to prevent each one.
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Customs clearance is a key part of importing, especially in the United Kingdom, where separate post-Brexit rules apply. Mistakes at this stage cause delays, extra costs or even goods being held. Here are the five we see most often.
1. Incomplete customs documentation
Mistake: a missing commercial invoice, packing list or proof of origin, or an imprecise description of the goods, leads to delays and questions from the authority.
- Prepare detailed invoices with full descriptions and values — see the commercial invoice to the UK: 8 mistakes.
- Make sure you have a correct UK EORI number and consistent data on all documents.
- Ask a customs agent to check the documents before the declaration is filed.
2. Incorrect classification of goods
Mistake: the wrong commodity code means the wrong duty rate and the risk of a correction after clearance.
- Check the code in the UK Trade Tariff and compare it with the description of the goods.
- If in doubt, you can apply to HMRC for an Advance Tariff Ruling (ATaR).
3. Not knowing the TCA preferences
Mistake: not knowing the rules of origin under the Trade and Cooperation Agreement (TCA) leads to unnecessary duty — or, conversely, to assuming 0% applies automatically.
- Check whether the goods meet the rule of origin for their code and get proof: a statement on origin from the exporter or the importer's own knowledge (GOV.UK).
- An EUR.1 certificate is not proof of origin in this trade. Details: UK–EU rules of origin.
4. Product not meeting UK requirements
Mistake: ignoring product requirements — marking, certification or chemicals rules (UK REACH) — can lead to goods being held.
- For most products the CE mark is still recognised in Great Britain; check whether your category needs UKCA or other marking — see also the key certificates for importing into the UK.
- Review labelling and safety requirements and monitor rule changes regularly.
5. Underestimating import costs
Mistake: leaving out VAT, duty or transport costs distorts the budget.
- The customs value includes transport and insurance up to the UK place of introduction (GOV.UK); import VAT is based on the customs value plus duty and other charges (GOV.UK).
- Allow for handling fees and storage, and for how you will pay — for example a duty deferment account (how a UK deferment account works).
- See what additional costs there are besides duty and VAT.
When it is worth using a customs agency
A customs agency checks documents before the declaration is filed, helps with classification and with deciding whether a preference can be claimed, and files the declaration in CDS. We explain how to choose one in how to choose a customs agency, and how we quote is explained on how much UK customs clearance costs.
Want to get your customs formalities in order before the first shipment? Get in touch.
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Frequently asked questions
What documents are needed for import clearance in the UK?
Usually a commercial invoice with a full description and value of the goods, a transport document, a packing list, an EORI number and — if you want to claim a preference — proof of origin. Some goods also need permits or certificates.
Is 0% duty in EU–UK trade automatic?
No. The preferential rate requires that the goods have preferential origin and proof: a statement on origin from the exporter or the importer's knowledge. Buying goods in the EU or UK does not determine their origin.
Can a product with a CE mark be sold in Great Britain?
For most products UK rules still recognise the CE mark, but the scope depends on the product category and some goods need other marking or registration. Always check the requirements for your category — see our article on UKCA.
What is import VAT in the UK charged on?
The VAT value is based on the customs value plus duty, excise and other charges, and transport and insurance costs up to the first destination in the UK (GOV.UK). So costs must be worked out from the customs value, not just the invoice price.
How do I avoid misclassifying goods?
Check the code in the UK Trade Tariff and compare it with the description of the goods; if in doubt you can apply to HMRC for an Advance Tariff Ruling (ATaR). Uncertain cases are worth discussing with a customs agent before the first shipment.
Related guides
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