What is HTSUS? Beginner's Tariff Guide

HTSUS: The DNA of U.S. Custom Tariffs

If you are importing goods into the United States, your cargo must be classified using the Harmonized Tariff Schedule of the United States (HTSUS). Maintained by the International Trade Commission (USITC), this 10-digit coding system determines the duty rates, surcharges, and restrictions for every product imported into the U.S.

1. Anatomy of a 10-Digit HTSUS Code

HTSUS codes are structured to move from broad categories to highly specific product details. Here is how a code is broken down (e.g., 6109.10.0010 for cotton T-shirts):

• Digits 1-2 (Chapter): The broad material category (e.g., Chapter 61: Articles of Apparel).
• Digits 3-4 (Heading): The specific item description within the chapter (e.g., T-shirts, singlet shirts).
• Digits 5-6 (Subheading): Harmonized globally across WCO member nations to declare material blends (e.g., Cotton).
• Digits 7-8 (U.S. Subheading): Unique to the United States to establish domestic tariff rates.
• Digits 9-10 (Statistical Suffix): Used by the U.S. Census Bureau to track import trade volumes and collect detailed trade data.

2. Reading the Tariff Slabs (General vs. Special)

When you lookup an HTSUS code in our USA calculator, you will see two duty columns:

• Column 1 General: The standard duty rate applied to imports from countries with which the U.S. maintains normal trade relations.
• Column 1 Special: Preferential tariff rates (often 0%) for countries covered by bilateral trade treaties (USMCA, KORUS, etc.) or concessions like GSP.

3. The Dangers of Misclassification

Importers are legally responsible for choosing the correct HTSUS code. Declaring an incorrect code to lower your duty exposure is considered customs fraud. CBP can issue penalties, seize cargo, and audit your historical shipment records back five years.