This course introduces the structure and purpose of the Harmonized Tariff Schedule of the United States (HTSUS) and its role in accurate product classification. Learners will explore how the HTSUS was developed, why proper classification is critical to customs compliance, and the responsibilities of importers and brokers in determining the correct tariff number. The course examines the hierarchical organization of the HTSUS — including sections, chapters, headings, subheadings, and notes — providing a foundation for navigating the nomenclature and understanding how classification decisions are made. By the end of the course, participants will be prepared to interpret the overall structure of the HTSUS and apply it as a framework for consistent tariff classification.