The Harmonized Tariff Schedule of the United States (HTS) sets out the tariff rates and statistical categories for all merchandise imported into the United States. The HTS is based on the international Harmonized System, which is the global system of nomenclature applied to most world trade in goods. The Commission publishes and maintains the HTS in its various forms, and periodically makes recommendations to the President regarding modifications needed to keep the HTS consistent with international nomenclature. 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.