March 21, 2026

HS codes and tariff classification — how to properly classify goods

Plutos Team

Licensed UK customs broker and trade compliance specialist with over 10 years of experience in cross-border trade between Poland and the United Kingdom. Expert in HMRC CDS declarations, BTOM import controls, T1 transit procedures, HS code classification, and special customs procedures. Advises Polish businesses on post-Brexit UK customs requirements.

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HS Codes and Customs Tariff

How to correctly classify goods — 2025 guide

Correct commodity classification according to HS codes (Harmonized System) is one of the most critical elements of customs clearance. An incorrect tariff code can result not only in customs duty surcharges, but also financial penalties from HMRC. Professional customs classification conducted by an experienced customs agent is an investment that protects against costly mistakes.

What is an HS code and how is it structured?

The HS system (Harmonized Commodity Description and Coding System) is a multi-level commodity classification system developed by the World Customs Organization (WCO) and used by over 200 countries worldwide as the basis for customs tariffs, trade statistics and foreign trade regulations.

Structure of the HS code:

Section (2 digits) — e.g. 84 = Nuclear reactors, boilers, machinery
Heading (4 digits) — e.g. 8471 = Automatic data processing machines
HS Subheading (6 digits) — e.g. 847130 = Portable laptops
CN Subheading (8 digits) — EU extension
UK tariff code (10 digits) — UK extension

Customs nomenclatures at the national level (8-10 digits) may differ between the UK and EU, but the first 6 digits (HS level) are identical worldwide.

UK Trade Tariff Tool — how to use it

GOV.UK provides a free tool UK Trade Tariff Tool (trade-tariff.service.gov.uk), which enables:

Search for tariff codes by commodity name or description fragment
Check duty rates for imports and exports
Verify preferential tariff rates (e.g. under UK-EU TCA)
Check required licences and permits (e.g. CITES, export licences)
Review trade protection measures (anti-dumping, anti-subsidy)
Search for tariff suspensions and quotas

Using the tool for customs duty valuation, you can obtain a full breakdown of customs costs for a specific shipment, taking into account the current HS code and tariff preferences.

TARIC — EU customs tariff

TARIC (Tarif Intégré de la Communauté) is the European Union’s integrated customs tariff, available free of charge through the European Commission portal (ec.europa.eu/taxation_customs/dds2/taric). TARIC contains:

Full CN nomenclature (8 digits) with descriptions
MFN tariff rates (Most Favoured Nation clause)
Preferential rates for countries with trade agreements with the EU
Trade protection measures (anti-dumping for specific countries)
Tariff quotas and tariff suspensions
Requirements for permits and documents

Following Brexit, the UK has its own tariff (UK Global Tariff), independent of TARIC — although in many cases the rates are similar or identical.

Rules of tariff classification

Classification of goods into an HS code is not arbitrary — it is subject to strictly defined General Rules for the Interpretation of the Nomenclature (GRI):

GRI 1: Classification according to the content of sections and headings and notes to sections and chapters
GRI 2: Incomplete/unassembled goods; mixtures of goods
GRI 3: Goods that can be classified under two or more headings: (a) the heading that most precisely describes them, (b) the material giving the goods their character, (c) the heading with the highest number
GRI 4: Goods to similar or analogous headings
GRI 5: Packaging, containers, covers
GRI 6: Classification to subheadings according to the same rules

Binding Tariff Information (BTI) — classification certainty

If you have doubts about the correct HS code for your goods, you can apply for Binding Tariff Information (BTI):

In the UK: Binding Tariff Information (BTI) — application to HMRC via Government Gateway (Trade Tariff BTIL — Binding Tariff Information Library)
In the EU/Poland: Binding Tariff Information — application to the appropriate Director of the Customs and Tax Chamber via PUESC

BTI is issued free of charge and is binding on customs authorities for 3 years (EU) or in accordance with HMRC’s decision. Having BTI protects the importer from having to pay additional customs duty in the event of a change in the customs authority’s position on classification.

Most common classification errors

Experience of customs agencies shows that the most common errors in goods classification are:

Selection of code based on trade name rather than actual composition/function of the goods
Failure to consider the stage of production (raw material vs. semi-finished product vs. finished product)
Incorrect classification of multifunctional devices
Non-adaptation to UK-specific subheadings (10-digit)
Using EU code (CN) instead of UK code or vice versa
Outdated codes (HS nomenclature is updated every 5 years — latest change: 2022)

Duty rates in the UK — overview of selected categories

Need help with UK customs clearance? Contact Plutos Team — our licensed customs brokers handle all aspects of UK import and export declarations, BTOM compliance, and T1 transit documents.