Antidumping Duty
An antidumping duty (AD) is an additional US duty on imports found to be sold below fair value, set by product, country, and often manufacturer, and collected alongside any countervailing duty on subsidized goods.
Why it matters for ecommerce brands
AD duties can multiply your landed cost and arrive as a bill years after import, so check for an order before you pick a supplier. Commerce sets rates by product, country, and often exporter, and you pay a cash deposit at entry, while the final rate is set later in an administrative review. For example, on a $100,000 entry with a 25% deposit, you pay $25,000 at import. If a review sets the final rate at 80%, CBP bills you another $55,000 plus interest when the entry liquidates. Moving production helps only if origin truly changes.
Origin
US antidumping duties began with the Antidumping Act of 1921, which targeted imports sold below their home-market price; today's cases run under the Tariff Act of 1930 as amended.
Common questions
- How do I know if antidumping duties apply to my product?
- Search the US Department of Commerce and CBP AD/CVD case listings by product and country, and ask your customs broker to review the scope language. Scope is defined by product description, not only HTS code.
- What is the difference between antidumping and countervailing duties?
- Antidumping duties offset prices below fair value, while countervailing duties offset foreign government subsidies. The same product can be subject to both, and they are collected together on the entry.
- Do AD/CVD duties stack with Section 301 tariffs?
- Yes. AD and CVD are added on top of normal duty and other tariffs such as Section 301, so the total can exceed the value of the goods. Your broker reports each one on the entry summary.