HS / HTS Codes

HS (Harmonized System) codes and HTS (Harmonized Tariff Schedule) codes are the numerical classification systems used to identify products in international trade. The HS is an international standard maintained by the World Customs Organization (WCO) and used by over 200 countries. The HTS is the U.S.-specific expansion of the HS system, administered by the U.S. International Trade Commission (USITC), that determines the duty rate applied to each imported product. Every commercial import entering the United States must be classified under an HTS code, and the accuracy of that classification directly affects the duties owed.

Structure of the Codes

The HS code is a 6-digit number structured hierarchically. The first 2 digits identify the chapter (broad product category), the next 2 digits identify the heading (a more specific grouping), and the final 2 digits identify the subheading. For example, HS 6402.91 breaks down as: Chapter 64 (Footwear), Heading 6402 (Footwear with outer soles and uppers of rubber or plastics), Subheading 6402.91 (covering the ankle).

The first 6 digits are standardized worldwide. A product classified as 6402.91 in the U.S. uses the same 6-digit code in China, Germany, and Brazil. This international consistency enables trade data comparison and tariff negotiations across countries.

The HTS code extends the HS to 10 digits for U.S. import purposes. Digits 7 and 8 are U.S.-specific subheadings that refine the classification. Digits 9 and 10 are statistical suffixes used for data collection. The full 10-digit HTS number determines the exact duty rate. Two products sharing the same 6-digit HS code might have different duty rates at the 8-digit HTS level.

Why Classification Matters

The HTS code determines three things: the applicable duty rate, whether any special trade program benefits apply (such as reduced rates under free trade agreements), and whether the product triggers any additional requirements from Partner Government Agencies.

A classification error has direct financial consequences. Consider a seller importing a polyester messenger bag. Under HTS 4202.92.3131, the duty rate is 17.6%. If incorrectly classified under 4202.92.9100, the rate might be 20%. On a $100,000 shipment, this misclassification costs an additional $2,400 in overpaid duties (or underpaid duties, depending on the direction of the error). Over a year of importing, classification errors can compound into tens of thousands of dollars.

How to Find the Right HTS Code

The USITC publishes the full HTS online at hts.usitc.gov, searchable by keyword and browseable by chapter. The classification process involves reading the section and chapter notes (which contain legally binding definitions and exclusions), then working through the headings and subheadings using the General Rules of Interpretation (GRI). The GRI establish how to classify products that could fit multiple headings, products made of multiple materials, and sets or kits containing different items.

Customs brokers classify products as part of their entry filing service. For products with ambiguous classifications, importers can request a binding ruling from CBP. A binding ruling is an official determination of the correct HTS code for a specific product, and CBP is legally bound to honor it for future entries of the same product. Ruling requests include a detailed product description, photographs, material composition, and samples if requested by CBP.

Section 301 and Special Tariff Considerations

The HTS code also determines whether a product is subject to Section 301 tariffs on Chinese goods. These additional tariffs of 7.5% to 25% apply to products listed in specific HTS chapters and headings covered by the trade action. A product’s HS classification might be the same whether it comes from China or Vietnam, but the total duty (base HTS rate plus Section 301 tariff) differs dramatically based on country of origin.

Free trade agreements (USMCA for Mexico and Canada, KORUS for South Korea, and others) offer reduced or zero duty rates for qualifying products. Eligibility depends on both the HTS classification and the product meeting rules of origin requirements specific to the trade agreement.

Annual Review

HTS codes and duty rates change periodically. The USITC updates the HTS to reflect new products, reclassifications, and trade policy changes. Importers should review their product classifications annually, especially when trade policies shift or when they introduce new product lines. A code that was correct two years ago may have been modified, split, or reassigned to a different duty rate.