Trump threatens to double tariffs on Canadian autos as trade war with Ottawa deepens

President Trump said Monday that the United States will raise tariffs on Canadian automobiles, auto parts and steel to 50 percent starting January 1, 2027, a fresh escalation that came three days after trade talks between Washington and Ottawa collapsed and triggered the steepest U.S.-Canada trade rupture in decades.

In a post on Truth Social, Trump wrote that Canada "has been ripping off the United States of America for years" and declared that "Canada will be treated like a State no longer." He added: "Build in the U.S. and there are ZERO TARIFFS." The new rate would double the current 25 percent tariff applied to non-U.S. content in Canadian-built vehicles and match a steel tariff already imposed earlier this year under separate authority.

What happened

The threat lands on top of a trade rupture that has been building for weeks. On July 20, Trump signed three proclamations under Section 338 of the Tariff Act of 1930 — the first-ever presidential use of that Depression-era authority — imposing 50 percent tariffs on a range of Canadian goods, including autos, alcohol, dairy and cement, that the administration says reflect Canada's "discriminatory" trade practices. The White House fact sheet accompanying the proclamations cited Canadian dairy quota rules, provincial alcohol boards and vehicle-tariff policy as the basis for the action.

Those tariffs were due to take effect August 19 but were postponed three days, until 12:01 a.m. ET on August 22, under a temporary suspension the administration said was granted because Canada had "expressed a commitment to remove the discriminations." The pause, formalized in a notice published in the Federal Register, gave negotiators a narrow window to reach a deal. Talks broke down instead, just before the extended deadline on the night of August 21.

The numbers

The tariffs that took effect August 22 apply to roughly $20 billion of Canadian exports by the U.S. government's own accounting — a figure Canadian officials put closer to $28 billion — covering dairy, alcoholic beverages, motor vehicles, cement, hockey sticks and several other categories. Monday's threatened increase would extend the 50 percent rate specifically to autos, auto parts and steel, effective the first day of 2027.

Markets responded quickly. Shares of Ford and Stellantis each fell roughly 4 percent in Monday trading, while General Motors dropped about 2 percent, reflecting investor concern over automakers' reliance on cross-border supply chains that move parts and vehicles between the two countries multiple times before a car is finished.

Section 338 had never been invoked by a U.S. president before this year. The 1930 law allows the executive to impose tariffs of up to 50 percent on a country found to discriminate against American commerce, without the lengthier investigative process required under more commonly used trade statutes. Trade lawyers have noted that its use against a close ally and top trading partner, rather than a strategic rival, marks a significant break from past practice, and some in Congress have questioned whether the administration is stretching the statute's original intent.

How the talks fell apart

The two sides offer competing accounts of what went wrong. U.S. Trade Representative Jamieson Greer said Canada "declined to finalize the trade deal under the terms agreed earlier this week," adding that "new demands and walk backs of other commitments by Canada have upended the careful balance reached in the past days."

Canadian Prime Minister Mark Carney told a different story. In an official statement issued the night talks collapsed, Carney said "last-minute changes in the U.S. proposed terms were unfair, uneconomic, and called into question the reliability of any deal," and that Canada had offered to lift its own retaliatory tariffs on steel, aluminum and autos in exchange for relief that never materialized. The following day, in remarks announcing Canada's response, he was blunter still.

"You're at war when you get attacked. We got attacked," Carney said, adding that the U.S. terms amounted to "a power play" that raised "a question of sovereignty." "In short, they asked too much, and they offered too little."

Carney said Canada will impose matching, dollar-for-dollar retaliatory tariffs on roughly $20 billion of U.S. goods beginning September 8 — the Tuesday after Labor Day — concentrated in steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. He noted that Canada is the top export destination for 26 U.S. states and among the top three for 45, and buys more American-built vehicles than the United Kingdom, Japan and China combined.

Who is affected

The auto sector sits at the center of the dispute. Flavio Volpe, president of Canada's Automotive Parts Manufacturers' Association, warned that tariffs on auto parts at the level Trump described would halt U.S. assembly lines that depend on Canadian-made components, since parts frequently cross the border several times during production. Farmers, dairy producers and border-state businesses on both sides face higher costs; in the U.S. Senate, Susan Collins of Maine and Peter Welch of Vermont have both raised concerns about the toll on their states' agricultural and small-business sectors.

Canada's economy was already showing strain before Monday's announcement. Gross domestic product contracted for a second consecutive quarter earlier this year, meeting the technical definition of a recession, and the Bank of Canada has estimated existing tariffs could leave Canadian output roughly 1.5 percent lower than previously projected by year's end.

Consumers stand to feel the effect on both sides of the border as well. Roughly a fifth of the vehicles sold in the United States are assembled in Canada or built with substantial Canadian content, and analysts who track the auto sector say a sustained 50 percent tariff on parts and finished vehicles would likely be passed on to buyers in the form of higher sticker prices well before the new rate takes effect, as manufacturers adjust production planning for the 2027 model year. Grocery and household goods could also see price pressure if Canada's retaliatory list, due within days, extends beyond the sectors Carney has already named.

Reaction

Ontario Premier Doug Ford, in remarks reported after Monday's escalation, said Trump had "declared war, economic war against his closest friend and ally," and threatened to cut off Ontario's critical mineral exports to the United States in response. Senate Minority Leader Chuck Schumer criticized the move on cost-of-living grounds, saying Trump "just slapped another bill on hardworking American families."

Some auto executives, speaking to reporters on condition of anonymity, were skeptical the 50 percent rate will actually take hold by January, noting the administration has announced large tariff increases before that were later delayed or softened in negotiation. Greer, for his part, said no further talks with Canada are currently scheduled.

What happens next

Canada's retaliatory tariffs are due to take effect September 8, with a detailed list of targeted goods still to be published. Whether Trump's January 2027 auto and steel increase is formalized in an actual proclamation — or renegotiated before then — remains an open question, as does whether the two governments resume talks at all in the meantime. Automakers on both sides of the border are bracing for the effect on 2027 model-year pricing, while economists will be watching Canada's next quarterly growth figures for signs of how deep the damage runs.