The Harmonized Tariff Schedule of the United States (HTS) is a system for classifying products and goods being imported into the United States. It sets out the tariff rates and statistical categories for all merchandise imported into the United States, and is based on the international Harmonized System, which is the global system of nomenclature applied to most world trade in goods. The HTS is a 10-digit code designed so that each article falls into only one category, and it is divided into chapters, each of which has a 2-digit number. Each product category within the various chapters is designated by 4, 6, 8 or 10 digits. The HTS was enacted by Congress and made effective on January 1, 1989, replacing the former Tariff Schedules of the United States. The USITC maintains and publishes the HTS (in print and online) pursuant to the Omnibus Trade and Competitiveness Act of 1988. U.S. Customs and Border Protection administers the HTS at U.S. ports of entry and also provides advice and rulings on matters relating to the classification of imports.

In summary, the HTS is a system for classifying products and goods being imported into the United States, and it sets out the tariff rates and statistical categories for all merchandise imported into the United States. It is based on the international Harmonized System and is administered by the U.S. Customs and Border Protection at U.S. ports of entry.