Anti-Dumping Duty

What Is Anti-Dumping Duty?

An anti-dumping duty is an additional import tax imposed to offset dumping that has been found to injure a domestic industry. When a foreign producer sells goods in an importing country below their normal value, and investigators determine this dumping is materially harming local producers, the importing government can levy the duty to raise the imported good's price back toward a fair level. The size of the duty is typically set to close the gap between the dumped price and the product's normal value, known as the dumping margin. Anti-dumping duties are permitted under World Trade Organization rules as a recognized trade remedy, distinct from ordinary protective tariffs.

Why It Matters

Anti-dumping duties are the most widely used trade remedy in the world, filed far more often than other measures. For the domestic industry that wins a case, the duty restores a measure of price competition and can preserve jobs and investment. For consumers and downstream firms that use the imported product, however, the duty means higher prices, echoing the general effects of any tariff. The tool is controversial precisely because dumping is difficult to prove: calculating a foreign firm's normal value and true costs involves assumptions that can be contested. Critics argue anti-dumping law is sometimes used as a backdoor form of protectionism, letting industries obtain relief from legitimate low-cost competition under the guise of fighting unfair trade.