There are three types of duties on imported goods:
- Ad valorem, which is a percentage of the merchandise value (e.g., 5 percent ad valorem)
- Specific, which is a specified amount per unit measure
- Compound, consisting of an ad valorem and a specific rate
An additional anti-dumping duty is assessed on merchandise the International Trade Commission finds to be imported for less than reasonable market value, which is injurious to U.S. industries.