Section 338 of the U.S. Tariff Act of 1930 allows the U.S. president to impose additional duties of up to 50 per cent in response to foreign trade practices considered discriminatory or disadvantageous to U.S. commerce.
The United States invoked Section 338 against Canada in 2026, with 50 per cent tariffs taking effect August 22 on $27.6 billion in Canadian goods. These tariffs are separate from the sector-specific Section 232 measures and the Section 301 tariffs.
Official U.S. source: U.S. Trade Representative, Section 338 Tariffs on Canada →
Canadian context: Government of Canada, Response to U.S. Section 338 Tariffs →
