A tariff is a form of tax imposed on imported goods or services. Tariffs are a common element in international trading. The primary goals of imposing A tariff is a tax imposed by one country on the goods and services imported from another country to influence it, raise revenues, or protect competitive advantages. Learn about the different types of tariffs, why governments impose them, and their unintended side effects. Learn what tariffs are, how they work, and their economic impact. Deepen your trade policy understanding with our guide. A tariff is a tax or duty imposed by a government on imported goods or services. Learn about the history of tariffs, the various types of tariffs (including examples), and the pros and cons of tariffs.