HS Code Reference & Structure Analyzer
Definition: an HS code is the internationally standardized number customs authorities use to name goods for tariff and statistics. It runs six WCO digits — chapter, heading, subheading — plus country-specific tariff and statistical digits to eight or ten. This page teaches the structure, the classification logic, and the official places to look codes up. This site does not provide an HS database search, because classification is a legal conclusion that belongs in the official tariff schedules.
HS Code Structure Analyzer
Split any 6–10 digit code into its WCO structural layers: chapter, heading, subheading, country and statistical digits.
Structure analysis only. This site does not provide an HS classification database and never guesses goods descriptions from numbers — always confirm the final code in your destination customs tariff schedule or a licensed broker before declaring.
How the Six WCO Digits Are Built
The Harmonized System is a tree, not an ID number: each pair of digits narrows the description, and moving between levels follows the published text of the tariff, not guesswork.
| Layer | Digits | Governed by | Reading rule |
|---|---|---|---|
| Chapter | 1–2 | WCO, all countries identical | Broad product family, e.g. 61 = knitted apparel |
| Heading | 1–4 | WCO, all countries identical | Product group, e.g. 6109 = T-shirts, knitted |
| WCO subheading | 1–6 | WCO, all countries identical | The international "HS six", used in trade statistics worldwide |
| Country tariff line | 7–8 | National customs authority | Rate-bearing line, e.g. US HTSUS 8-digit breakouts |
| Statistical suffix | 9–10 | National statistics office | Data granularity only, e.g. US 10-digit reporting codes |
Classification logic (GRI order of operations)
Step 1: read the section and chapter notes before anything else — they can override everything below. Step 2: choose headings by their legal text, not by pictures or supplier descriptions. Step 3: among competing headings, the most specific description wins over the most general. Step 4: multi-function goods classify by essential character; mixtures and retail sets by the component that gives them their identity. Step 5: anything still unplaced falls to the residual "other" subheadings of its nearest family.
Risks of getting it wrong
A wrong code silently changes the duty rate — sometimes by double-digit percentages — and customs can re-open past entries, demanding the shortfall plus interest and penalties. FTA claims (ChAFTA, RCEP, USMCA-style agreements) are rejected when the certificate's code does not match the declaration. Regulatory goods (batteries, electronics, toys) may additionally miss inspection regimes they are subject to, which compounds clearance delay with compliance exposure.
Official HS Lookup Channels
Look up codes where the legal answer actually lives. These are the public, free-to-use official channels; each country's own schedule is the binding one at its border.
International six-digit level
WCO (World Customs Organization) HS nomenclature database — the reference text for chapters, headings and the six international subheading digits.
United States
USITC Harmonized Tariff Schedule (hts.usitc.gov) — searchable legal tariff text with 10-digit statistical breakouts; CBP CROSS publishes ruling letters on classification disputes.
European Union
EU TARIC database and the Access2Markets portal — combined nomenclature, TARIC additional codes, and the EU's Binding Tariff Information (BTI) decisions.
United Kingdom
GOV.UK Trade Tariff lookup — the UK Global Tariff post-Brexit schedule with integrated duty, VAT and licensing measures.
Australia
Australian Border Force tariff classification pages and working tariff — the schedule that carries ChAFTA preferential rates against each tariff line.
China (export side)
China Customs declaration portal and the HS-based export tariff catalogue of the General Administration of Customs — the codes your supplier's export declaration will carry.
Scope and basis statement
This page deliberately ships no goods-description database and no fake search API: the structure analyzer above parses digits and nothing more, and it will never output a goods description or duty rate. The binding classification sources are the WCO nomenclature and each destination customs authority's own schedule; binding decisions (BTI, CROSS rulings) exist for legal certainty, and licensed brokers carry liability for advice. Nothing here is legal advice.
HS Code FAQ
How is an HS code structured?
The first two digits are the chapter, digits three and four form the heading, and digits five and six complete the WCO subheading — those first six digits are internationally standardized across all 160+ contracting customs administrations. Digits seven through ten are country-specific: national tariff lines and statistical suffixes, so the same goods carry different 8 or 10 digit codes in different countries.
How do I determine the correct HS classification for my product?
Work through the WCO General Rules for the Interpretation of the Harmonized System in order: start from the headings that plausibly describe the goods, apply the chapter and section notes, prefer the heading that describes the item most specifically over a more general one, and for multi-function or mixed goods apply the essential-character rule. Classification is a legal conclusion, so verify it against the destination country's published tariff schedule or a licensed customs broker before declaring.
Where can I look up HS codes through official channels?
Use the WCO HS nomenclature database for the international six-digit level, the US International Trade Commission HTS database for the United States, the EU TARIC and Access2Markets databases for the European Union, the UK Global Tariff lookup, the Australian Border Force tariff working pages, and China's customs declaration portal for exports from China. All are free, official sources; this site links the method rather than repackaging their data.
What happens if my goods are misclassified?
Misclassification changes the duty rate, triggers retroactive duty demands with interest and penalties when audited, delays clearance for physical inspection, and can turn a duty-free FTA claim into a rejected one when the certificate does not match the declared code. Incorrect classification is treated as an incorrect declaration even when unintentional, so the declaring party carries the risk.
Last reviewed: September 2026 · Standard source: WCO Harmonized System, GRI interpretative rules.