How to Find the Right HS Code: A Step-by-Step Method

What an HS code is and why the digits matter

The Harmonized System (HS) is the World Customs Organization nomenclature used by more than 200 economies. It fixes the first six digits of every customs code: two for the chapter, four for the heading, six for the subheading.

Each customs territory adds its own digits. The EU uses the 8-digit Combined Nomenclature (CN) and the 10-digit TARIC code for import measures. The UK Global Tariff uses 10-digit commodity codes. The US Harmonized Tariff Schedule (HTSUS) uses 8-digit tariff lines plus 2 statistical digits. Türkiye uses the 12-digit GTİP, whose first eight digits follow the EU CN because of the customs union.

The code decides the duty rate, import VAT treatment in some cases, anti-dumping and other trade remedies, licensing, product safety checks and trade statistics. A wrong code is a wrong declaration, even if nobody notices for years.

The current edition is HS 2022. The WCO has adopted the next edition, HS 2028, which enters into force on 1 January 2028; national tariffs will be re-coded on that date, so codes you rely on today may move.

The legal hierarchy you classify with

Classification is a legal exercise, not a keyword search. The binding texts are, in this order of authority:

• The wording of the headings and the section and chapter notes (legally binding).
• The General Interpretative Rules (GIR 1 to 6), which are part of the HS Convention.
• National additional notes, such as CN additional notes, US additional U.S. notes or UK notes.
• Explanatory notes: the WCO HS Explanatory Notes and, in the EU, the CN Explanatory Notes. They are not legally binding but customs authorities and courts follow them closely.
• Classification regulations (EU), classification opinions of the WCO, and court judgments, in particular of the Court of Justice of the EU and the US Court of International Trade.
• Binding rulings issued to traders, which bind the authority and the holder for the goods described.

The General Interpretative Rules in practice

The six rules are applied in sequence. You move to the next rule only when the previous one does not settle the question.

GIR 1: headings and notes first

Classification is determined by the terms of the headings and any relative section or chapter notes. Titles of sections and chapters are for reference only. Most goods are classified under GIR 1 alone, which is why reading the notes is the single most useful habit.

GIR 2: incomplete goods and mixtures

GIR 2(a) brings incomplete or unfinished articles into the heading of the finished article if they have its essential character, and covers unassembled or disassembled goods. GIR 2(b) extends a heading for a material to mixtures and combinations with other materials, which then sends you on to GIR 3.

GIR 3: when two headings compete

3(a): the most specific description wins over a more general one. 3(b): mixtures, composite goods and sets put up for retail sale are classified by the component that gives them their essential character. 3(c): if neither works, take the heading that occurs last in numerical order.

GIR 4, 5 and 6

GIR 4 classifies goods by the heading of the goods they are most akin to, a rarely used fallback. GIR 5 deals with cases, boxes and packing: fitted cases presented with the article follow the article, normal packing follows the goods. GIR 6 applies the same logic at subheading level: you compare only subheadings at the same level, and subheading notes apply.

A practical method in seven steps

Use this sequence for every new product and keep a written record of each step. The record is your best defence in an audit.

• Describe the product precisely: material, composition by weight, function, how it works, how it is presented (set, kit, retail pack), and its state (finished, unfinished, unassembled).
• Find candidate sections and chapters. Read the section notes and chapter notes, especially exclusions (for example Section XVI notes exclude many parts of general use).
• Choose the four-digit heading by its wording and the notes (GIR 1). If two headings fit, apply GIR 3.
• Choose the six-digit subheading with GIR 6, comparing only subheadings at the same level of indentation.
• Add the national digits in the importing territory (CN/TARIC, UK commodity code, HTSUS, GTİP) and read the national notes.
• Check explanatory notes, classification regulations and existing binding rulings for similar goods (EBTI, CBP CROSS, UK rulings, Turkish BTB decisions).
• If doubt remains or the duty difference is material, apply for a binding ruling before you import in volume.

Binding rulings: BTI, CBP rulings, ATaR and BTB

A binding ruling protects you against a later reclassification for the goods covered. Apply with technical sheets, photos, composition and, where helpful, samples.

EU Binding Tariff Information (BTI)

Issued under Article 33 of the Union Customs Code (Regulation (EU) No 952/2013) by the customs authority of a Member State and valid throughout the EU for three years. The holder must quote the BTI reference in the declaration. Issued BTIs are searchable, without confidential details, in the Commission's EBTI database.

US CBP rulings

CBP issues binding rulings under 19 CFR Part 177, usually through the National Commodity Specialist Division. Rulings are published and searchable in the CROSS database. They are a reliable guide for similar goods, but only the named transaction is formally bound.

UK Advance Tariff Rulings (ATaR)

HMRC issues ATaRs for goods imported into or exported from Great Britain. They are legally binding on HMRC and the holder for three years. Northern Ireland follows EU BTI rules for goods under the Windsor Framework.

Türkiye Binding Tariff Information (BTB)

The Ministry of Trade issues Bağlayıcı Tarife Bilgisi (BTB) under the Customs Law No. 4458. A BTB is valid for three years and binds the administration for the goods described when the holder uses it.

Worked example: a stainless steel insulated water bottle

Product: a double-walled, vacuum-insulated drinking bottle of stainless steel, 750 ml, with a plastic screw cap, sold empty in a retail box.

Step 1. The first instinct is Chapter 73 (articles of iron or steel), heading 7323, table and kitchen articles. But heading 9617 covers vacuum flasks and other vacuum vessels, complete; parts thereof other than glass inners. A vacuum-insulated bottle is a vacuum vessel.

Step 2. Note 1 to Chapter 73 and the Chapter 96 notes do not exclude it from 9617. Heading 9617 is more specific than 7323, so GIR 1 (and, if needed, GIR 3(a)) leads to 9617.

Step 3. Heading 9617 is not split further at six digits, so the HS code is 9617.00.

Step 4. In the EU CN, subheading 9617 00 is divided by type of vessel; read the CN subdivisions and check EBTI for vacuum bottles before declaring the 8-digit code. In the US, look at HTSUS 9617.00 and its statistical suffixes, and search CROSS for vacuum bottles.

Step 5. If the bottle were only double-walled without a vacuum, 9617 would not apply and you would return to 7323. This is exactly the kind of technical fact you must confirm with the supplier and record.

Common classification mistakes

Most errors we see in practice come from a small set of habits:

• Using the exporter's code. The first six digits may be right, the national digits rarely are, and the exporter is not liable for your declaration.
• Classifying by use or by brand name instead of by the heading wording and notes.
• Ignoring section and chapter exclusion notes, for example parts of general use (Section XV) in machinery chapters.
• Treating explanatory notes as optional, or treating them as law; they guide but do not override the notes.
• Applying GIR 3(b) to things that are not sets put up for retail sale.
• Forgetting that a code change on 1 January (annual CN update, HS 2028) can move your product.
• Choosing a code to get a lower rate. Customs looks at the goods, and penalties for incorrect declarations can be heavy.

Checklist before you declare

• Product sheet with composition, function and photos on file.
• Notes and GIR reasoning written down.
• Explanatory notes and similar rulings checked.
• National digits checked in the current tariff of the importing country.
• Measures linked to the code checked: anti-dumping, quotas, licences, product safety.
• Binding ruling requested if the duty or measure difference is material.