Assigning the wrong HS code to your goods can result in paying too much duty, having shipments held at the border, or facing penalties from customs authorities. Yet many businesses guess or copy codes from similar products without following a systematic process. This guide walks you through the professional approach used by licensed customs brokers.
Step 1: Gather Complete Product Information
Before you open a tariff schedule, you need a complete picture of what you are classifying. Customs classification is based on the objective characteristics of the goods at the time they are presented to customs — not on how they will be used or what the buyer intends to do with them.
Document the following for your product:
- Physical composition: what materials or substances the product is made from
- Manufacturing process: how the product was made (woven vs knitted, cast vs machined)
- Function or principal purpose: what the product is designed to do
- Presentation: how it is packaged and whether it is presented in sets or individually
- Whether it is complete or incomplete, finished or unfinished
- Any relevant industry or technical specifications
Step 2: Identify the Relevant Section and Chapter
The Harmonized System is divided into 21 Sections, each covering a broad category of goods. Sections are then divided into Chapters. A good starting point is to read the Section and Chapter notes, which are legally binding and can include or exclude certain products from a chapter.
For example, if you are classifying a plastic bottle, you would likely look first at Section VII (Plastics and articles thereof), which includes Chapters 39 and 40. However, if the bottle contains a medical substance, the Chapter notes might direct you to Chapter 30 instead.
TIP
Always read the chapter notes before looking at individual headings. Chapter notes can expand or restrict what is included in a chapter and override what seems like an obvious classification.
Step 3: Select the Correct Heading
Once you have identified the most likely chapter, read through the headings to find the one that best describes your product. Apply General Rule of Interpretation 1 first: classify goods according to the terms of the headings and any relevant section or chapter notes.
If two headings seem equally applicable (which happens with multi-function products), move to Rule 3: prefer the heading that provides the most specific description, or if specificity is equal, the heading that covers the component that gives the product its essential character.
Step 4: Select the Correct Subheading
Once you have identified the correct four-digit heading, apply the same logic to select between the six-digit subheadings. Subheading notes (separate from chapter notes) may also apply at this stage.
Pay attention to the dash structure in the tariff schedule. Single-dash subheadings are broader; double-dash subheadings are subordinate to single-dash ones. You must follow the hierarchy and cannot jump from a single-dash to a double-dash subheading without going through the correct parent.
Step 5: Apply National Extensions
Once you have a six-digit HS code, you need to extend it to the national tariff of the country you are importing into. For the United States, add four more digits to reach the 10-digit HTS code. For the EU, you may need to look up the 8-digit CN code or the 10-digit TARIC code.
National tariff databases are usually available free of charge from government customs agencies:
- United States: usitc.gov (HTS Online Reference Tool)
- European Union: taxation-customs.ec.europa.eu (TARIC database)
- United Kingdom: trade-tariff.service.gov.uk
- Australia: abf.gov.au (Working Tariff)
- Canada: cbsa-asfc.gc.ca (Customs Tariff)
Step 6: Verify Using the Explanatory Notes
The WCO publishes Explanatory Notes for each heading and subheading. These notes are not legally binding (unlike the chapter notes), but they are the most authoritative guidance available on the scope of each classification. If you are unsure whether your product falls within a particular heading, the Explanatory Notes will often provide clarity.
Step 7: Seek a Binding Tariff Ruling for High-Value Goods
For products with high import volumes, ambiguous characteristics, or significant duty implications, consider applying for an Advance Tariff Ruling (also called a Binding Tariff Information in the EU). These are formal, legally binding decisions from customs authorities confirming the correct classification of your specific product.
A binding ruling protects you from reassessment for as long as the ruling is valid (typically three to five years). It also demonstrates good faith to customs authorities if your classification is ever questioned.
WARNING
Never simply copy an HS code from a competitor's product listing or invoice without verifying it yourself. The code may be wrong, outdated, or applicable to a slightly different product. Each classification should be independently verified based on your specific goods.
Using AI Tools to Accelerate Classification
AI-powered classification tools can dramatically speed up the initial classification process, especially for businesses dealing with large product catalogues. These tools analyse your product description and return candidate HS codes with confidence rankings, saving hours of manual tariff schedule navigation.
However, AI tools should be used as a starting point, not a definitive answer. They perform best on clearly defined, common products. For novel, complex, or multi-component goods, professional review remains essential.