Canada Trade War Escalates—50% Tariffs Now Live, Ottawa Plans Dollar-for-Dollar Retaliation After Labor Day

President Donald Trump’s 50 percent tariffs on roughly $20 billion in Canadian goods took effect at midnight Saturday after last-minute trade negotiations collapsed, prompting Canadian Prime Minister Mark Carney to announce reciprocal duties that will begin September 8.

The new levies, imposed under Section 338 of the Tariff Act of 1930, target a wide range of products including wine, hockey equipment, cement, furniture, dairy items, clothing and other consumer and industrial goods. Energy, potash, fish, critical minerals and products already covered by earlier Section 232 tariffs remain exempt. The measures apply even to goods that would otherwise qualify for preferential treatment under the United States-Mexico-Canada Agreement.

U.S. Trade Representative Jamieson Greer said Canada walked away from what he described as the best available deal after three days of intensive talks. The administration has framed the tariffs as a response to long-standing Canadian discrimination against American dairy, motor vehicles and alcoholic beverages, including provincial restrictions on U.S. liquor and supply-management barriers that limit U.S. dairy access.

Carney, speaking from Parliament Hill on Saturday, said Canada would match the U.S. tariffs “dollar for dollar” to protect Canadian workers, farmers and businesses. The retaliatory measures, details of which are to be released in coming days, will target U.S. steel, dairy, appliances, agricultural equipment, pulp and paper, electronics and additional categories. They are scheduled to take effect the Tuesday after Labor Day—September 8.

Trump responded on Truth Social, stating that Canada “wants the benefits of being a State, without being one!!!” and that Canadian tariffs had long charged American farmers “massive amounts.” He declared “No more!!!”

Both governments blamed the other for the breakdown. Canadian officials cited last-minute U.S. changes they called unfair and uneconomic; American officials said Canada refused reasonable concessions on sensitive sectors. The standoff escalates an already strained trade relationship and raises questions about the future of the broader North American trade framework.

The tariffs represent the first known modern use of the 1930 statute to impose duties and cover about 5 percent of Canada’s annual goods exports to the United States. With the duties now live and Canadian countermeasures locked in for early September, businesses on both sides of the border face higher costs and disrupted supply chains while the two governments dig in for a prolonged confrontation.