Canadian Prime Minister Mark Carney announced that Canada will impose dollar-for-dollar retaliatory tariffs on U.S. goods beginning September 8, following the breakdown of high-stakes trade negotiations in Washington.

The escalation comes after the United States implemented 50% tariffs on approximately $20 billion worth of Canadian exports early Saturday morning. The new American import duties affect roughly 5% of Canada’s annual shipments to the U.S., targeting a wide range of products including steel, cement, agricultural products, and consumer goods.

Speaking from Ottawa, Prime Minister Carney stated that Canada’s retaliation will take effect the Tuesday after Labor Day, with specific product lists released in the coming days. The counter-measures are expected to target key American sectors including steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics.

Carney explained that Canadian negotiators were prepared to drop existing retaliatory duties on steel, aluminum, and autos if Washington agreed to lower its own tariffs, but stated that last-minute U.S. demands were “unacceptable”. According to Canadian officials, the additional terms from Washington would have weakened protections for Canadian sovereignty, restricted independent trade deals with other nations, and reduced agreed-upon tariff relief for Canadian-made vehicles.

U.S. Trade Representative Jamieson Greer countered that Canada was offered the most favorable terms of any major trade partner, blaming Ottawa for walking away from a balanced agreement.

The rupture marks a significant turning point in North American trade relations, raising questions about the future stability of cross-border supply chains and the broader United States-Mexico-Canada trade framework. Carney acknowledged that the counter-tariffs would raise costs and limit choices for Canadian consumers in the short term, but maintained that rejecting a flawed deal was critical to protecting the country’s economic sovereignty.