HS codes for chemicals and why they matter

Every chemical that crosses a border is classified under a customs code. That code decides the import duty, whether a licence is needed, which anti dumping measures apply and in which trade statistics the shipment appears. Get it wrong and you can pay too much duty, too little (and face penalties later), or have a container held at the port. This guide explains how HS codes work for chemicals and how to find the right one.

What the Harmonized System is#

The Harmonized Commodity Description and Coding System, usually called the HS, is maintained by the World Customs Organization (WCO). Most countries base their customs tariffs and trade statistics on it, which makes it the common language of international trade.

The HS has a hierarchical structure:

The first six digits are the same in every country that uses the HS. Countries then add digits for their own tariff and statistics. India uses eight digit ITC(HS) codes, the EU uses eight digit Combined Nomenclature codes and ten digit TARIC codes, and the United States uses ten digit codes in its Harmonized Tariff Schedule.

The WCO revises the nomenclature roughly every five years. Each edition is named after the year it takes effect, and the current one is HS 2022. Codes can move between editions, so always check which edition a code refers to when you compare old documents or statistics.

The chapters that matter for chemicals#

Most chemical products fall within Section VI of the HS, "Products of the chemical or allied industries", which covers chapters 28 to 38. Plastics follow in chapter 39.

Some chemicals sit outside these chapters, which surprises people. Mineral fuels, oils and many hydrocarbon mixtures are in chapter 27. Undenatured ethyl alcohol of 80 percent strength or more is in heading 22.07, with beverages, not in chapter 29. Crude glycerol is in heading 15.20, while refined glycerol is in subheading 2905.45.

Chapters 28 and 29: separate chemically defined compounds#

The notes to chapters 28 and 29 are the key to most chemical classification. In general, these chapters cover separate chemically defined compounds, meaning a single substance with a defined composition, whether or not it contains impurities. The notes also allow:

• solutions of those compounds in water
• other solutions, as long as the solvent is there only for safety or transport reasons and does not make the product suitable for a particular use
• small amounts of stabilisers, anti dusting agents or colouring added for identification or safety

Once you formulate, blend or add something that makes the product suited to a specific use, it usually leaves chapters 28 and 29. Mixtures of chemicals typically go to chapter 38, often heading 38.24, or to a more specific heading such as 32.08 for paints or 34.02 for detergent preparations.

A few examples show how the structure works:

• Sodium hydroxide, solid: 2815.11. In aqueous solution (lye or liquid soda): 2815.12.
• Methanol: 2905.11.
• Acetic acid: 2915.21.
• Caffeine and its salts: 2939.30.
• Paracetamol: 2924.29, as an aromatic amide.

How classification works: the General Interpretative Rules#

Customs classification follows the six General Interpretative Rules (GIRs) of the HS. For chemicals, these are the ones you use most:

1. GIR 1. Classification is decided by the wording of the headings and the section and chapter notes. Titles of sections and chapters are only for reference. Most chemicals are settled here, by reading the chapter notes carefully.
2. GIR 3. When goods could fit more than one heading, the most specific description wins. If that does not settle it, mixtures are classified by the component that gives them their essential character, and failing that, by the heading that comes last in numerical order.
3. GIR 6. The same principles apply at subheading level, comparing subheadings within the same heading.

The WCO also publishes Explanatory Notes, which are the official interpretation of the headings. They are not law in every country, but customs authorities rely on them heavily.

Practical steps to find the right code#

1. Identify the product precisely. Is it a single compound or a mixture? What is the concentration? Is it a salt, ester or hydrate? Use the CAS number and the composition from the SDS.
2. Find the chapter and heading. For a single compound, start in chapter 28 or 29 and follow the chemical structure: for example 29.05 acyclic alcohols, 29.15 saturated acyclic monocarboxylic acids, 29.33 heterocyclic compounds with nitrogen.
3. Check the chapter notes to confirm the product fits, especially if it is a solution or contains additives.
4. Find the six digit subheading, then the national tariff line for the country of import.
5. Check precedents. Look for binding rulings on similar products. The EU publishes binding tariff information decisions, US Customs and Border Protection publishes rulings, and in India the Customs Authority for Advance Rulings issues advance rulings.
6. Record the reasoning. Keep a short note of why you chose the code. It is invaluable if customs questions it later.

For important or recurring imports, consider asking for a binding ruling or advance ruling before you ship. It gives legal certainty for the importer.

Why the code matters beyond duty#

Licences and restrictions. Many controls are linked to tariff codes. India's import and export policy in the ITC(HS) schedules marks each code as free, restricted or prohibited. Export control lists such as SCOMET and precursor controls often reference HS codes as well, although the list itself is what decides.

Trade remedies. Anti dumping duties and safeguard duties are imposed on described products, usually with a list of tariff codes, from named countries.

Preferential duty. Free trade agreement rules of origin are often written as changes of tariff classification, so you need the code of both the product and its inputs.

Statistics and market research. Trade statistics are published by HS code, and CompoundList's trade pages show imports and exports between countries at six digit level. If you know a product's code, you can see which countries buy and sell it and roughly at what unit value.

Common classification mistakes#

• Classifying by use instead of by composition. A chemical used in medicines is not automatically in chapter 30. Chapter 30 covers mainly finished medicines and certain other pharmaceutical goods, while APIs as single compounds generally stay in chapter 29.
• Ignoring the solution rule. A pure compound dissolved in a solvent to make it suitable for a particular use may move out of chapters 28 and 29.
• Using another country's national digits. The first six digits travel, the rest do not. An Indian eight digit code is not valid in the EU tariff.
• Copying the supplier's code. The exporter's code on the commercial invoice is a helpful hint, but the importer is responsible for the declaration in its own country.
• Forgetting edition changes. A code that was valid under HS 2017 may have changed under HS 2022.

Using HS codes on CompoundList#

Chemical pages on CompoundList show a suggested HS code where one could be determined. The suggestion is a starting point, not a ruling. The HS code pages show official import and export figures for each code, including the largest exporting and importing countries and trends over recent years. Use them to understand who trades a product, then confirm the classification for your own shipment with your customs broker.