Canadian Prime Minister Mark Carney announced Friday night, August 21, that Canada will retaliate against new US tariffs on a dollar-for-dollar basis, after negotiations between Ottawa and Washington collapsed just before a scheduled deadline.

What Carney Said

Carney said Canada would match Washington's new tariffs "dollar for dollar in order to protect Canadian workers, farmers, families and businesses." He specified that Canada's countermeasures would be concentrated in specific sectors: steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. The response will target products already subject to what Carney described as the United States' "unjustified section 232 and 338 tariffs." Carney framed the move as "a focused response" designed to protect and defend Canadian industries while allowing them to remain competitive against US products.

How the Talks Broke Down

Ontario Premier Doug Ford said he had been on the phone with Carney throughout the day Friday, speaking with him again around 11:45 p.m. — just before Carney announced the negotiations had failed. "I've always said we need to fight these tariffs tariff-to-tariff, dollar-to-dollar, and I'm glad he didn't sign that deal because it was a bad deal," Ford said. Ford indicated he planned to raise the need for aid to Canada's steel and auto sectors during a scheduled 1:30 p.m. ET call the following day with Carney and the other provincial premiers — sectors he said were already discussed with Carney on Friday.

A Pattern of Escalation and De-escalation

Friday's breakdown marks the latest swing in a trade relationship that has repeatedly cycled between confrontation and partial reconciliation over the past year and a half. Canada has imposed retaliatory tariffs on US goods three separate times since the trade war began, including counter-tariffs on $60 billion worth of US consumer goods and additional levies on US autos. Just weeks before Friday's collapse, Carney had actually moved to end most of Canada's counter-tariffs while maintaining measures on steel, aluminum, and autos, as negotiations with Washington appeared to be progressing — a move Trump himself had called "nice" at the time, saying he wanted to "be good to Canada." That goodwill evidently didn't hold, with Trump raising tariffs on some Canadian goods to 35% on August 1 after the two sides failed to meet an earlier deadline, with the administration attributing the increase to fentanyl trafficking concerns and Canada's earlier retaliatory measures.

Domestic Political Reaction

The tariff dispute has become a genuine domestic political flashpoint in Canada as well. Conservative Leader Pierre Poilievre had criticized Carney's earlier decision to drop most counter-tariffs as "showing weakness," arguing the government was making unreciprocated concessions to Washington. Friday's dollar-for-dollar announcement appears to reflect, at least in part, a response to that domestic pressure to project firmness rather than continued conciliation.

Currency Market Reaction

The renewed trade tension has rippled into currency markets. The Canadian dollar had rallied ahead of Friday's deadline as investors grew hopeful a deal might be reached, while the US dollar separately dropped to a three-month low following the US Treasury's decision to double its long-term bond buybacks — a move that sparked fears of currency dilution and rising national debt. Analysts at Corpay, including strategist Karl Schamotta, noted that investors are likely to further downgrade expectations for US monetary tightening following the tariff breakdown, adding that "at the margin, this shift in expected rate differentials should represent a headwind for the loonie."

The Broader Stakes

Canada remains the United States' largest trading partner in several key categories, with autos alone representing one of the country's most economically significant exports — Canada shipped nearly C$50 billion (roughly $35 billion) in vehicles to the US market in a recent full year, with major manufacturers including General Motors, Stellantis, and Toyota all operating assembly plants in Ontario. Sector-specific tariffs on autos, steel, and other targeted Canadian industries carry outsized economic consequences for a relationship built on decades of deep cross-border manufacturing integration.

What's Next

With formal negotiations now collapsed and Carney's countermeasures set to take effect, attention turns to whether the two sides can find a path back to the negotiating table, and how quickly Washington responds to Canada's retaliatory measures. Given the cyclical pattern of escalation and partial de-escalation that has defined this relationship since the trade war began, further shifts in the coming weeks appear likely. For continuing coverage, see The Globe and Mail's live coverage.