U.S. President Donald Trump is threatening to impose a 50% [1] import duty on Canadian goods starting next month.

The move signals a significant escalation in trade tensions between the two neighbors. By leveraging a law from the Great Depression era, the administration aims to force concessions on long-standing disputes regarding Canada's supply-managed dairy system and provincial bans on U.S. alcohol [5, 6].

To implement these duties, the president is invoking the Smoot-Hawley Act, a tariff law enacted in 1930 [4]. The act was originally designed to protect U.S. farmers and industries during the early years of the Great Depression, a tool that has largely fallen out of modern use.

There is a discrepancy regarding the scale of the targeted imports. Some reports indicate the tariffs could affect more than 500 [2] Canadian goods, while other sources state only dozens [3] of products are being targeted. These duties are slated to take effect in August 2026 [2, 4].

The administration is using these tariffs as leverage to address specific trade grievances. These include the restrictive nature of Canada's dairy market, and various provincial regulations that limit the sale of American alcohol [5, 6].

Legal experts said the use of the Smoot-Hawley Act could face a court challenge. However, some analysts said the current administration may have the legal standing to succeed this time [1].

U.S. President Donald Trump is threatening to impose a 50% import duty on Canadian goods

The invocation of the Smoot-Hawley Act represents a shift toward aggressive protectionism. By using a law from 1930 to target a primary trading partner, the U.S. is prioritizing bilateral leverage over the stability of the integrated North American supply chain, potentially risking retaliatory tariffs from Canada.