The US International Trade Commission updates the Harmonized Tariff Schedule on a yearly basis to reflect new legislation, trade practices, and adjusted tariff rates. In addition to yearly updates, interim updates are published throughout the year to reflect current international trade standards and practices.

Effective September 1, 2006 the following major changes have been made to the US Harmonized Tariff Schedule:

• Presidential Proclamation 8039 (71 F.R. 43635) of July 27, 2006, To Implement The United States-Bahrain Free Trade Agreement, and for Other Purposes, effective August 1, 2006 Federal Register
• Presidential Proclamation 8033 (71 F.R. 38255) of June 30, 2006, To Modify Duty-Free Treatment Under the Generalized System of Preferences, effective July 1, 2006 Federal Register Notice
• Presidential Proclamation 8034 (71 F.R. 38509) of June 30, 2006, To Implement the Dominican Republic-Central American-United States Free Trade Agreement with Respect to Guatemala, effective July 1, 2006
• Determinations Under the African Growth and Opportunity Act-United States Trade Representative Notice to add the Republic of Chad to the List of Countries Eligible Under AGOA (71 FR 24762)
• Presidential Proclamation 7995 – To Extend Nondiscriminatory Treatment for Products of the Ukraine (71 FR 16969)
• Presidential Proclamation 7996 – To Implement the Dominican Republic-Central America-United States Free Trade Agreement With Respect to Honduras and Nicaragua (71 FR 16971)
• Modifications to the Harmonized Tariff Schedule of the United States to Implement the Dominican Republic – Central American – United States Free Trade Agreement with Respect to Honduras and Nicaragua (USITC Pub. 3845, March, 2006)
• Presidential Proclamation 7987 – To Implement the Dominican Republic – Central America – United States Free Trade Agreement (71 FR 10827)
• Modifications to the Harmonized Tariff Schedule of the United States to Implement the Dominican Republic – Central American – United States Free Trade Agreement with Respect to El Salvador (USITC Pub. 3829, March 1, 2006)