US-Canada Trade Deal Collapse Leaves 50% Tariffs Locked In

Three days from "DEAL" to trade war

Late on a Tuesday night in August, President Donald Trump posted that Washington and Ottawa had a "DEAL!" and pushed back new tariffs on Canada by three days. By Friday night the agreement was dead. The two closest trading partners in North America then started a tariff war that, by mid-October, still had no end in sight.

The tariffs had a 30-day grace period and were set to start at midnight on Aug. 19. Trump delayed them, saying the two sides had a deal "subject to the finalization of documents."2 By then, U.S. Trade Representative Jamieson Greer had spent more than a week negotiating with Canada's top trade officials. The two sides had agreed on a broad framework and briefed industry groups.2 Canada-U.S. Trade Minister Dominic LeBlanc met Greer for several hours on Thursday. On Friday, officials were still at the trade representative's office after 10:30 p.m. Eastern time.33 Prime Minister Mark Carney then announced he was suspending talks and calling Canada's negotiators back to Ottawa.33 The 50 percent duties on about $20 billion of Canadian goods took effect at midnight.2

How fast it fell apart tells you a lot about how this administration bargains. When the main incentive is a deadline the White House sets and moves itself, a deal can be announced before it is actually finished.

Two incompatible stories

Washington and Ottawa still tell different stories about who broke the deal. Greer's statement said Canada "declined to finalize the trade deal under the terms agreed earlier this week." He blamed "new demands and walk backs" for upsetting the balance. He also said the U.S. had offered major tariff cuts on steel, aluminum, autos and lumber, plus a wider partnership on digital trade, critical minerals, aerospace and export controls.10 A White House official said the Canadians kept bringing up late changes to the Section 232 sectoral tariffs. Two people familiar with the talks said U.S. tariff rates on heavy-duty trucks were the specific sticking point.2

Carney rejects that account. Asked whether Canada made last-minute requests, he said "'No,' is the short answer," and that Canada had only clarified what was on offer.2 In his telling, the U.S. went back on its word. The two sides had agreed to cut auto tariffs to 15 percent, subject to U.S.-content rules, and then the Americans tried to leave medium and heavy-duty trucks out of that relief without explaining why.233 He said the U.S. also added, in the final hour, limits on Canada's ability to sign trade deals with other countries. He called that "a power play" and a question of sovereignty.10 Canada also objected to demands that it said threatened "the French language and our culture."2 LeBlanc said Washington having a say in Canada's free trade agreements with other partners "wasn't something that we were prepared to consider."7

On trucks, both sides agree on the facts but not on the timeline. Heavy-duty truck tariffs did sink the deal. The dispute is whether Canada raised the issue late or the U.S. dropped trucks late. Neither government has released documents that would answer that.

The third-country clause is easier to judge. The White House says the language was about "economic cooperation and security" and compares it to wording in the U.S.-U.K. agreement.2 But Carney has staked his strategy on reducing Canada's reliance on the U.S., including a plan to double exports to other markets.16 Any outside limit on new trade deals would have undercut that strategy, which explains why he walked away instead of accepting it.

The turf war inside the administration

The most notable reporting on the collapse points to tension inside Washington. Two people familiar with the talks said Commerce Secretary Howard Lutnick felt Greer's office had "sprung" the framework on his department. That mattered because the core issues, tariff cuts on cars, steel and aluminum, fall under Commerce.5 Three people said Lutnick texted and called Carney directly several times in the last week of talks.2 One person familiar with the negotiations said that parallel channel could explain why each side accuses the other of changing terms late.2 Carney hinted at this, saying Canada's team stayed united "You cannot say that about the United States administration."2

The White House calls this a "weird deflection" and says Lutnick did not derail anything.2 Still, administration allies admit that some of Canada's requests fell under Lutnick's authority. Early in the talks, he had also objected to broader concessions on metals.2 My reading is that both stories can be partly true. If two U.S. officials were sending Ottawa signals that didn't fully match, then a Canadian "clarification" could easily look like a "new demand" from Greer's side of the table.

The escalation ladder

Once the talks ended, both sides retaliated quickly. The U.S. duties hit wine and liquor, cement, clothing and hockey equipment. They cover roughly 5 percent of imports from Canada, on top of existing tariffs on steel, aluminum, autos and lumber.31 The legal basis is Section 338 of the Tariff Act of 1930, which allows duties of up to 50 percent on countries that "discriminate" against U.S. commerce.33 Reports differ on how unusual this is. NBC says the provision had never been used before, while CNBC calls it rarely cited.3322 Either way, an almost-forgotten Depression-era law is now a working trade weapon.

Trump then said he would raise tariffs on Canadian vehicles, auto parts and steel to 50 percent starting Jan. 1, 2027.7 He told Canadian leaders to "fall in line" or face something "far WORSE."26 On Sept. 8, Ottawa put counter-tariffs on C$27.6 billion of U.S. goods, at rates from 15 to 50 percent. It doubled its tariffs on U.S. steel, aluminum and iron to 50 percent, and kept its existing 25 percent duty on U.S. autos.22 The government says its list covers more than 700 products and matches the U.S. action dollar for dollar, though not product for product. It also announced a C$7.5 billion support package.2629

Washington answered the same day. New proclamations banned many Canadian dairy products, motorcycles and alcoholic drinks starting Sept. 29. Trump also told the General Services Administration to pull Canadian-origin products from federal procurement schedules.25 He threatened to block Bombardier aircraft sales in the U.S. unless the company built its planes there.25 Treasury Secretary Scott Bessent said Carney "needs to stop campaigning and start governing."25

Why this matters beyond the border

Outlets describe the size of what's at risk differently. Coverage of the collapse used a figure of more than $1 trillion in North American trade.2 Other figures are smaller: about $760 billion in bilateral trade in 20254, or $333.6 billion in U.S. goods exports to Canada against $381.9 billion in imports in the latest full year.24 The differences mostly come from what gets counted. Whatever the total, the new duties apply to a small share of it. The harm is concentrated in specific places, such as Kentucky bourbon, California wine and the auto supply chain.29 One estimate puts U.S. importers' and consumers' share of the tariff cost at 96 percent.25

The bigger risk is to the continental trade framework. In July, Washington declined to renew the USMCA in its current form. The pact stays in force but now goes through annual reviews toward a 2036 expiry.38 Carney said the collapse was "certainly not good news" for the agreement.31 The longer-running problem is that partners can't count on deals with Washington lasting. Trump has broken off talks with Canada before, over a digital services tax in June 2025 and over an Ontario ad quoting Ronald Reagan that October.11 B.C. Premier David Eby said any agreement with Trump would have been unstable.26 Agricultural analysts say whether partners can trust negotiated deals to stick is now the main question.39

The politics of walking away

At home, walking away has helped Carney so far. Conservative leader Pierre Poilievre and Ontario Premier Doug Ford backed the decision. Ford called the proposed agreement "a terrible deal."2 Alberta Premier Danielle Smith was a notable exception and urged both sides to go back to talks.31 U.S. officials say Ottawa killed the deal to stir up support before provincial elections in Quebec and Alberta.21

Business groups in both countries are pressing for a deal. The U.S. Chamber of Commerce warned of "an escalating cycle of tariffs."2 The Canadian Chamber called the breakdown "a body blow to North American competitiveness."33

Where it stands

In early September Greer said "there are no negotiations happening on trade right now," and called the dispute "more their emergency than ours."36 On Oct. 8 he said the two sides talk often, "including at the highest levels." He said Washington is "holding fast" and suggested the Quebec election was occupying Ottawa.35 One agricultural commentator called the situation a "slow roll" that both leaders seem comfortable with for now, though he still expects a deal eventually.39 Poilievre, meanwhile, took a tariff-free auto trade pitch to Detroit.20

The midterm elections on Nov. 3 are the next pressure point.37 Polling shows a majority of Americans think tariffs have gone too far.37 Lower prices could push the White House back to the table. But the 72 hours in August showed that a framework is not a deal, and that one announced before Washington's own agencies agree on it can fall apart quickly. Until the U.S. negotiates with one voice and Canada gets terms that leave its trade policy elsewhere alone, the current tariffs are likely to stay.