How to Classify Products with HTS Codes: A Step-by-Step Guide

What Is the HTS and Why Does It Matter?

The Harmonized Tariff Schedule (HTS) is the classification system US Customs and Border Protection (CBP) uses to determine the duty rate on every product imported into the United States. It's based on the international Harmonized System (HS), maintained by the World Customs Organization and used by over 180 countries.

Every HTS code is a 10-digit number. The first two digits are the chapter, digits 3–4 form the heading, digits 5–6 are the international subheading, digits 7–8 are the US tariff line, and digits 9–10 are the statistical suffix. The first six digits are harmonized internationally — a ceramic mug is classified under 6912.00 whether it's imported into the US, Germany, or Japan. The last four digits are US-specific and determine your actual duty rate.

Getting the classification right matters because different codes within the same chapter can have wildly different duty rates. A stoneware mug might be duty-free while a porcelain one carries a 6% duty. A cotton t-shirt under one heading faces 16.5% while a similar garment under another faces 32%.

The 6-Step Classification Process

Step 1: Identify the Material, Function, and Key Characteristics

Before you open the tariff schedule, write down everything you know about the product. Ask yourself: What is it made of? What does it do? Who uses it and how? Is it finished or unfinished? Is it a set or a single item?

Example: A ceramic coffee mug. Material: ceramic (stoneware). Function: drinking vessel. Use: household kitchenware. Finished product. Single item. This points us toward Chapter 69 (ceramic products), specifically heading 6912 (ceramic tableware and kitchenware).

Step 2: Find the Right Chapter

The HTS has 99 chapters organized in a logical progression: live animals and food products come first (Chapters 1–24), then raw materials and chemicals (25–40), textiles and apparel (50–63), metals (72–83), machinery and electronics (84–85), vehicles (86–89), and so on.

Some of the most common chapters for US imports:

• Chapter 39: Plastics and plastic articles
• Chapter 61: Knitted apparel (t-shirts, sweaters, socks)
• Chapter 62: Woven apparel (dress shirts, suits, jackets)
• Chapter 64: Footwear
• Chapter 69: Ceramic products
• Chapter 73: Iron and steel articles
• Chapter 84: Machinery and mechanical appliances
• Chapter 85: Electrical machinery and equipment
• Chapter 94: Furniture, lighting, prefabricated buildings
• Chapter 95: Toys, games, and sports equipment

Step 3: Work Through the Headings Using the General Rules of Interpretation

Once you've identified the chapter, find the correct 4-digit heading using the General Rules of Interpretation (GRIs):

• GRI 1: Classification is determined first by the terms of the headings and any relevant section or chapter notes.
• GRI 2(a): Incomplete or unfinished articles are classified as if complete.
• GRI 3: When a product could fall under two or more headings, the most specific description wins; if tied, essential character determines classification.
• GRI 4: Goods that can't be classified under GRI 1–3 go to the heading for the most similar goods.
• GRI 5: Special rules for cases, containers, and packing materials.
• GRI 6: Classification at the subheading level follows the same principles.

Step 4: Narrow to the 6-Digit Subheading

The 6-digit subheading is where the international classification ends. For a cotton t-shirt under heading 6109, the subheadings break down by fiber content: 6109.10 (of cotton) vs. 6109.90 (of other textile materials). The distinctions usually come down to material composition, size, intended use, or other defining characteristics.

Step 5: Find the US-Specific 8- and 10-Digit Code

Now you move into US-specific territory. The 8-digit tariff line determines your actual duty rate, and the 10-digit statistical suffix is required for entry filing. For our cotton t-shirt under 6109.10, the US breaks it down further by factors like whether it's men's/boys' or women's/girls'. A men's cotton t-shirt lands at 6109.10.0012, with a general duty rate of 16.5%. Search the actual HTS schedule →

Step 6: Verify the Duty Rate and Check for Special Tariffs

Finding the code is only half the job. You also need to know the total duty burden, which may include:

• Section 301 tariffs: Additional duties on goods from China, ranging from 7.5% to 100%.
• Section 232 tariffs: 25% on steel and aluminum articles.
• Reciprocal tariffs: Country-specific tariff rates applied under the current trade policy framework.
• AD/CVD duties: Antidumping and countervailing duties on specific products from specific countries.
• FTA preferential rates: Reduced or zero duty rates if the product qualifies under a free trade agreement.

Use the landed cost calculator to see the full duty breakdown. If the product originates from an FTA partner country, check with the FTA eligibility checker.

Common Classification Mistakes

1. Classifying by End Use Instead of Material or Construction

The HTS is organized primarily by what a product is, not what it's used for. A plastic storage container used in a kitchen is classified under Chapter 39 (plastics), not Chapter 94 (furniture) or Chapter 82 (kitchen tools).

2. Using the Wrong Chapter for Multi-Material Products

A backpack made of nylon with leather trim could go to Chapter 42 (leather goods) or Chapter 63 (textile articles). The answer depends on which material gives the bag its essential character under GRI 3(b). Getting this wrong can swing your duty rate by 10% or more.

3. Trusting Your Supplier's HTS Code

Foreign suppliers frequently provide HS codes on commercial invoices, and importers often pass those directly to their broker. The problem: suppliers use 6-digit international codes that may not correspond to the correct US 10-digit code. Always verify independently using the HTS search tool.

4. Ignoring Section and Chapter Notes

Every section and chapter in the HTS starts with legal notes that define terms, exclude specific products, and set classification rules. If you skip the notes, you'll end up in the wrong place.

5. Not Checking for Binding Rulings on Similar Products

CBP publishes thousands of binding rulings that explain how specific products are classified. Before you commit to a code, search customs rulings for products similar to yours.

When to Get Professional Help

Self-classification works well for straightforward products. But some situations call for professional guidance:

• Complex multi-component products where GRI 3 essential character analysis isn't clear-cut.
• High-value or high-volume imports where a 2–3% classification error compounds into six figures of overpaid or underpaid duties.
• Products that span multiple possible headings and where you can't find a clear ruling precedent.
• Any situation where AD/CVD duties might apply, since the penalties for misclassification are severe.

In these cases, consider requesting a Binding Ruling from CBP. A binding ruling is a written decision that tells you exactly how your product should be classified, and it's legally binding on CBP at the port of entry. You can file a ruling request through CBP's eRulings system, or have a licensed customs broker or trade attorney handle it for you.