USITC Tariff Database Interactive (data current through December, 2013) Quick lookup; effective dates; related trade data.
This database is expressed in terms of the most recent version of the Harmonized Tariff Schedule of the United States (HTS). Tariffs are provided at the tariff-line (8-digit HTS item) level. Where differing units of quantity exist at 10-digit HTS line-item levels for a given 8-digit number, "NA" will appear for quantity. Also, multiple lines of data will appear for those items that changed rates or special-program eligibility during the year.
Quick Lookup - Tariff Programs--Tariff preference programs, eligible countries, GSP eligibility by product and country.
Tariff Database Tables 1997-2013--for browsing or downloading
Future Tariffs Lookup--Scheduled U.S. Tariff Reductions
DataWeb Assistance for technical help with database