Trump’s new Canadian tariffs arrived after eleventh-hour trade negotiations disintegrated. Canada promises matching retaliation after automotive tariffs helped sink a possible deal. Carmakers face more uncertainty as North America’s key trade relationship deteriorates. Just when it looked like America and Canada might be ready to put their tariff boxing gloves away, somebody rang the bell for another round. The US has imposed 50 percent tariffs on around $20 billion worth of Canadian goods after eleventh-hour negotiations between the neighbors spectacularly fell apart, and Canada says it will apply the same levies back. The new duties on Canadian goods cover a random shopping list stretching from hockey equipment to dairy products, alcohol and flower bulbs. More importantly for the auto industry, the breakdown reportedly came partly because Washington and Ottawa couldn’t agree on how Canadian-built vehicles should be treated. Related: Washington Wants More American-Made Cars. Detroit Warns That’ll Cost You More Canadian Prime Minister Mark Carney says US negotiators changed the proposed terms at the last minute, including reducing tariff relief for Canadian-made vehicles. “They asked too much and offered too little,” Carney said, according to The Guardian. He’s recalled Canada’s negotiating team and says no more talks are currently planned. Washington tells the story differently. US Trade Representative Jamieson Greer claims Canada introduced fresh demands and backed away from previous commitments just as a deal appeared close. The US had offered reductions on tariffs affecting autos, steel and lumber, Greer said. Canada isn’t planning to sit quietly while the new duties bite. Carney has promised a “dollar for dollar” response, with retaliatory tariffs due to begin September 8. Those will target areas including steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. Crossing Borders For automakers, another tariff fight is particularly unwelcome. The US, Canada and Mexico have spent decades developing deeply intertwined manufacturing networks, with vehicles and components routinely crossing borders, in some cases multiple times, during production. Now the latest dispute also raises awkward questions about the future of the USMCA trade agreement connecting all three countries. Carney accused the Trump administration of using “economic integration as a weapon,” while arguing that Canada wouldn’t sacrifice its sovereignty or major industries, including the auto industry, to secure a deal. We predict they’ll be back at the negotiating table before long, but until a deal is eventually hammered out, carmakers need to brace themselves for some big tariff-related costs that could affect how much you pay for your new car. Stellantis