August 24, 2026
25% is where the Section 232 tariff on non-US content in Canadian-built vehicles remains, because the deal that would have cut it to 15% collapsed shortly before midnight on August 21. Canada’s government issued a statement that evening setting out what it had been negotiating for, and explained the following day why it walked away from what it called a bad deal. Dollar-for-dollar counter-tariffs take effect the Tuesday after Labour Day, September 8.
Medium and heavy-duty trucks are what broke it. The 15% rate had been agreed. In the closing hours Washington limited the relief to light vehicles, leaving mid and heavy-duty trucks at the higher rate, and Ottawa would not take a deal that carved out a segment it had spent the negotiation trying to protect. The Office of the US Trade Representative gave a different account of who moved, saying Canada declined to finalize terms agreed earlier in the week and that new demands upended a careful balance. Both accounts agree on the substance: the sticking point was which vehicles qualified, not the number.
A Segment Nobody Covers Sank a Deal Covering Everything
Heavy trucks are close to invisible in most reporting on Canadian vehicle assembly, which is written almost entirely about passenger cars and light pickups. Ontario builds commercial vehicles, and the workers and suppliers attached to that output are not a rounding error to the province that has them. A tariff schedule that relieves a Canadian-built crossover and leaves a Class 8 tractor at 25% splits the country’s own industrial base, and it asks Ottawa to sign the split.
That is the part worth carrying forward regardless of what happens next. The negotiation was reported for six weeks as an argument about a rate. It ended as an argument about scope, and scope is where trade agreements usually die, because a rate is a number both sides can meet in the middle on and a carve-out is a decision about whose plants count.
50% is the rate that took effect on August 22 under Section 338 of the Tariff Act on roughly $20 billion of Canadian goods. That action carves out autos and parts, which remain under Section 232, so vehicle assembly did not get worse on Saturday. It did not get better either, and the threat of doubling the auto rate to 50% has been voiced since without being enacted. Canada’s own retaliation list for September 8 covers steel, dairy, appliances, agricultural equipment, pulp and paper and electronics. Ottawa had been prepared to drop its remaining counter-tariffs on steel, aluminum and autos if Washington lowered its own, and that trade is now off the table.
The Bargaining Table Stopped Waiting
August 22 is the morning Unifor reached tentative agreements with General Motors covering more than 4,600 members, announced by the union hours after the tariff wall went back up. The agreements cover Locals 222, 88, 199 and 636 at Oshawa Assembly, the idled CAMI Assembly plant in Ingersoll, St. Catharines Propulsion and the Woodstock parts distribution centre. Ratification meetings are set for August 29 and 30. Master bargaining chairperson Trevor Longpre said the committee entered the round in the middle of tariff uncertainty and emerged with a deal securing the pattern the union set with Ford, which GCBC covered when the Oakville agreement priced Canadian assembly labor for this cycle.
Roughly 30% of the unit was on layoff when talks opened on August 10. The union settled anyway, in the same twelve hours that the trade file blew up, which is the clearest available signal that the bargaining table has stopped treating tariff policy as a variable it can wait out. A four-year agreement signed into a 25% duty prices the duty in. It does not price in a cut that has now failed twice.
Nothing in the Week Touched Brampton
August 12 is when Stellantis informed Unifor of its intent to open discussions with another company about a possible sale of the Brampton assembly plant, per the union’s statement. More than 2,200 Local 1285 members have been on layoff since the plant was idled in December 2023 to retool for the electric Jeep Compass. Retooling paused in February 2025. The Compass was reassigned to a US plant in October 2025. One year is the minimum notice the collective agreement requires for a closure or a sale, and Unifor says no formal written notice has been delivered.
That sequence is untouched by anything that happened over the weekend, and it would have been untouched by the deal too. A 15% rate improves the economics of building a vehicle in Brampton. It does not assign a vehicle to Brampton, and the vehicle was reassigned ten months before the negotiation reached its deadline. The same holds at GM’s Canadian operations and across Stellantis. Product allocation runs on a five to seven year clock. This negotiation ran on a three-day extension.
Three things now set the direction. Whether Washington enacts the doubled auto rate it has threatened, which would be a different order of event from anything discussed this month. Whether Canada’s September 8 list stays off vehicles, which so far it does. And whether Stellantis delivers the one-year notice, which remains the first hard signal on whether Brampton is being sold as an operating plant or emptied. The rate was never the binding constraint. The scope fight that ended these talks is a reminder that it was not the only thing being negotiated either.
