U.S. 50% tariffs take effect on nearly US$20 billion of Canadian imports

Tariffs now apply to selected Canadian goods

The United States imposed additional 50% tariffs on nearly US$20 billion of selected Canadian imports at 12:01 a.m. EDT on August 22. The measures cover roughly C$28 billion in trade and about 5% of Canada’s annual goods exports to the United States, according to the U.S. Trade Representative.

President Donald Trump issued three Section 338 proclamations on July 20 concerning alleged Canadian discrimination involving motor vehicles, alcoholic beverages and dairy. An August 18 proclamation delayed their implementation from August 19 to August 22, according to the White House.

Covered products include selected agricultural goods, hockey equipment, wine, cement, clothing, cosmetics, jewelry, furniture and other manufactured products. The duties apply to covered goods that qualify as originating under the United States-Mexico-Canada Agreement.

Energy, potash, critical minerals, fish and products already subject to Section 232 tariffs are excluded from this 50% action. That exclusion limits the measure’s immediate reach into continental oil, gas and electricity trade.

Canada schedules retaliation

Prime Minister Mark Carney suspended negotiations on August 21, saying the United States had introduced last-minute terms that were unfair and uneconomic. On August 22, he announced dollar-for-dollar Canadian counter-tariffs effective September 8, concentrated in steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics.

Canada has not published its final counter-tariff product list, rates, exemptions or remission process. Talks could resume before September 8, although no new negotiating round had been scheduled as of August 23.

U.S. Trade Representative Jamieson Greer said the United States had offered tariff reductions in sectors including steel, automobiles and lumber and that Canada rejected the proposal. No mutually agreed public negotiating text is available, leaving the parties’ accounts of the failed talks unresolved.

U.S. importers bear the initial legal cost of the new American tariffs. The extent to which those costs are passed to consumers or Canadian suppliers will depend on contracts, inventories, exchange rates and exemptions. Carney acknowledged that Canadian retaliation will raise costs and reduce choices for some Canadian importers and consumers.

USMCA access faces greater uncertainty

The tariff scope is limited relative to overall goods trade. U.S. Census data show US$376.0 billion in bilateral goods trade during January through June 2026, including US$200.2 billion of U.S. imports from Canada and US$175.8 billion of U.S. exports.

The 50% rate could make affected shipments commercially uncompetitive, even though the action does not cover most Canadian exports. It also reduces the practical certainty that rules-of-origin compliance had provided to companies using integrated North American supply chains.

The Bank of Canada’s July 2026 outlook assumed exemptions would continue for USMCA-compliant goods. The Section 338 duties invalidate that assumption for the covered products, as shown by the bank’s tariff assumptions.

USMCA remains legally in force through 2036. The United States declined to extend the agreement during its July 1 joint review, moving the pact into annual reviews, according to Global Affairs Canada.

Whether the Section 338 tariffs violate USMCA or other international commitments has not been resolved through adjudication. The proclamations have no specified end date and remain effective until modified or terminated.