The Harmonized Tariff Schedule of the United States (HTS), is the primary resource for determining tariff classifications and deciphering customs duties owed for goods imported into the United States. Experts use the HTS, in conjunction with explanatory notes, general notes, general rules of interpretation, and Customs Binding Rulings to help determine the correct HTS. Correct classification is a part of the importer of records “reasonable care” requirement. Penalties for non-compliance can be severe. 19 U.S.C. 1592 is the statute CBP references when issuing penalties for negligence, gross negligence or fraud – depending on the degree of culpability CBP believes you had at the time of your non-compliance.