These duties aim to counterbalance the adverse impacts of such subsidies.
[2][1] According to World Trade Organization rules, a country can launch its own investigation and decide to charge extra duties, provided such additional duties are in accordance with the GATT Article VI and the GATT Agreement on Subsidies and Countervailing Measures.
Since countries can rule domestically whether domestic industries are in danger and whether foreign countries subsidize the products, the institutional process surrounding the investigation and determinations has significant impacts beyond the countervailing duties.
Countervailing duties in the U.S. are assessed by the International Trade Administration of the U.S. Department of Commerce which determines whether imports in question are being subsidized and, if so, by how much.
If the U.S. International Trade Commission determines that there is material injury to the competing domestic industry, the Department of Commerce will instruct U.S. Customs and Border Protection to levy duties in the amount equivalent to subsidy margins.