Harmonized Tariff Services LLC is a customs consulting firm and a licensed customhouse broker in Potomac, Maryland, near Washington DC. Founded as Customs Science Services, Inc., in 1989, Harmonized Tariff Services LLC has been providing expert advice on HTS classifications & "customs" lab testing to the international trade community ever since. Our clients include 12 of the 100 largest U.S. industrial corporations (Forbes) and about 200 smaller companies. In addition, we provide expert scientific advice and laboratory referral services to a number of customs attorneys and customhouse brokers. We have almost 40 years of experience in "customs" matters.
Harmonized Tariff Services LLC works closely with our sister company, Customs Laboratory Services LLC, which is a commercial testing laboratory in nearby Rockville, Maryland.