Principal Use
Principal use is the primary commercial use of a class or kind of goods in the United States, as determined by the overall pattern of use in the U.S. market — not the specific use any individual importer intends. It is the governing standard for use-based tariff provisions under Additional U.S. Rule of Interpretation 1(a) and appears in headings throughout the HTSUS.
In Detail
Many HTSUS headings classify goods "of a kind used for," "designed for use in," or "principally used" for a specific purpose. These use provisions do not classify goods by their physical description but by the primary function they serve in U.S. commerce. Principal use analysis asks: of the entire class of goods represented by this import, what is the primary use by volume or value in the United States market?
The class determination is critical. Principal use is not an individual determination — it applies to the entire class or kind of goods to which the product belongs, as that class is understood commercially in the United States. If 75% of a type of glassware sold in the United States is used for drinking beverages and 25% is used for scientific measurement, the principal use is drinking. An individual importer who purchases that glassware for laboratory use still classifies it as drinking glassware, because the classification follows the principal use of the class, not the buyer's specific application.
CBP determines principal use through trade surveys, industry data, historical classification rulings, and analysis of how similar goods have been treated in prior CBP determinations. When principal use is genuinely contested — because a product class has two or more significant uses with comparable market shares — the analysis requires market evidence, not just the importer's characterization. Defining the class too narrowly (to capture only the importer's specific product) or too broadly (to dilute the relevant use data) is a common source of principal use disputes.
Classification Significance
Principal use provisions are among the most contested HTSUS categories because the analysis depends on market data and class definition rather than the product's physical attributes alone. Errors are common when importers classify based on their own intended use rather than the commercial principal use of the product class, or when the class boundaries are drawn incorrectly. A CBP audit in a use-provision chapter will scrutinize both the class definition and the evidence supporting the principal use determination.
How Kanon Handles This
Kanon captures intended use and product class as intake attributes and evaluates them against applicable use provisions in the HTSUS. Where a heading requires principal use analysis, the product class is identified, the applicable Additional U.S. Rule 1(a) provision is cited, and the basis for the principal use determination is documented in the Classification Support Package.