One number decides the duty rate, the paperwork and whether customs waves the shipment through. This guide shows how the code is built, how to find the right one and what mistakes cost.
Every product that enters the UK travels under a ten-digit number, and that number quietly decides more about an import than the supplier, the freight rate or the exchange rate: the duty percentage, whether anti-dumping charges apply, what documents customs expects, and whether the shipment sails through clearance or sits in an exam queue. Yet most first-time importers let someone else guess it.
The first six digits come from the World Customs Organization's Harmonized System (HS) — identical in China, the UK and almost everywhere else. The supplier's export paperwork and the UK import declaration should agree on these six. The last four digits are the UK's own subdivisions, and this is where the money lives: two products sharing the first six digits can carry different duty rates in the final four.
| Consequence | How the code decides it |
|---|---|
| Duty rate | Each 10-digit line has its own rate — commonly 0% to 12%, higher for textiles and footwear |
| Anti-dumping duty | Specific codes from China carry additional duties that can exceed 50% (e-bikes, ceramics, some steel and aluminium) |
| Import VAT base | Duty feeds into the VAT calculation, so a wrong rate compounds (see the duty & VAT guide) |
| Documentary requirements | Some codes trigger licences, safety certification or additional checks at the border |
| Clearance friction | Codes that mismatch the goods description invite physical exams and delay |
Under-declared duty does not disappear — HMRC can reassess up to three years back, with interest, and the legal responsibility sits with the importer, not the freight agent who filed the entry. Over-declaring is the quieter loss: paying 6.5% where the correct line is 2.7% for months before anyone notices. Reclaims are possible but slow. Both problems cost more than the thirty minutes it takes to classify properly the first time, which is why code confirmation is a standard part of Bridgeway's customs clearance support.
Practical habit: classify the product before requesting supplier quotes, not after the goods ship. The duty rate belongs in the landed-cost calculation that decides whether the product is worth importing at all.
Common questions
The first six digits are, by international agreement. The remaining digits diverge: China uses its own extensions for export, the UK its own for import. The UK declaration needs the full 10-digit UK code, not the supplier's export code.
The importer of record. Freight forwarders and brokers file the declaration as agents, but HMRC pursues the importer for underpaid duty, interest and any penalties.
A free, written HMRC decision on a product's classification, binding for three years. Applications run through GOV.UK and suit products that will be reordered — one ruling removes the ambiguity for every future shipment.
No — a mixed shipment declares each product line under its own code, each with its own duty rate. Packing lists and invoices should be itemised so the declaration can be too.
Get a real figure
Send the supplier quote, carton details and destination. Bridgeway will reply with a practical route and cost view.