The United States imposes tariffs (customs duties) on imports of goods. The duty is levied at the time of import and is paid by the importer of record. Customs duties vary by country of origin and product. Goods from many countries are exempt from duty under various trade agreements. Certain types of goods are exempt from duty regardless of source. Customs rules differ from other import restrictions. Failure to properly comply with customs rules can result in seizure of goods and criminal penalties against involved parties. The United States Customs and Border Protection (CBP) enforces customs rules.