Canada suspended trade negotiations with the United States on 21 August 2026, and additional 50 per cent US tariffs on Canadian goods took effect shortly after midnight. President Donald Trump had signed three proclamations imposing the duties on 20 July, then announced a three-day pause on the understanding that a deal had been reached. It collapsed at the document stage.
The legal basis is unusual. The tariffs rest on Section 338 of the Smoot-Hawley Tariff Act of 1930, a provision never previously used in this way. It carries no time limit, and it is likely to be challenged in court. The duties cover roughly $20 billion of Canadian goods — about five per cent of Canada’s exports to the United States — across close to five hundred items, including cement, furniture, dairy, wine, whisky and clothing. Some goods previously protected under the USMCA are affected.
Canada announced dollar-for-dollar retaliation on a comparable value of US goods, effective 8 September, targeting steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. Reporting on the exact value and duty range is not consistent, and the figures should be read as provisional until the Canadian government’s own schedule is published in full.
Prime Minister Mark Carney said the last-minute US changes were unfair and called the reliability of any deal into question, and said Canada had been attacked. The United States trade representative, Jamieson Greer, said Canada had declined to finalise terms it had already agreed and added new demands. No further talks have been scheduled. US demands reported at the time included reducing tariff relief for Canadian-made vehicles and constraining Canada’s ability to pursue trade deals with other countries.
The United States still takes about three-quarters of Canada’s merchandise exports, which is what makes the rupture consequential for both sides. Carney said decades of economic integration were over and that Canada would diversify toward Europe and Asia. A Leger poll found 56 per cent of Canadians wanted no further concessions and more than 70 per cent supported stronger retaliation.
