An HTS code (Harmonized Tariff Schedule code) is the 10-digit classification number assigned to every product imported into the United States. The first six digits are internationally harmonized under the World Customs Organization's Harmonized System, while the final four digits are specific to the U.S. tariff schedule.
The Harmonized Tariff Schedule of the United States (HTSUS) is published by the U.S. International Trade Commission and updated multiple times per year. Each code maps to a duty rate, special program eligibility, and any applicable trade remedies — including Section 301, Section 232, and antidumping or countervailing duties.
The 10 digits break down as:
- Digits 1–2: Chapter (e.g., 84 for machinery)
- Digits 1–4: Heading
- Digits 1–6: Subheading (internationally harmonized)
- Digits 7–8: U.S. tariff rate line
- Digits 9–10: U.S. statistical suffix
Importers, customs brokers, and the importer of record are legally responsible for declaring the correct HTS code on every entry. Misclassification — even unintentional — can result in penalties under 19 U.S.C. § 1592.