Ontario is preparing to add another layer to Canada’s escalating trade response against the United States, putting Premier Doug Ford’s government alongside Ottawa in a confrontation that is increasingly centred on manufacturing, energy and economic leverage. Ford indicated that Ontario could introduce measures of its own after discussing the next steps with Prime Minister Mark Carney, while warning that electricity and critical minerals could become part of the response if Washington escalates further.
The timing has moved quickly. Canada’s federal government formally detailed its latest retaliation on August 25, after the United States imposed 50% tariffs on C$27.6 billion worth of Canadian goods. Ontario’s next moves could now determine how far retaliation extends beyond conventional tariffs and into areas where individual provinces hold significant economic power.
Ford Is Preparing a Provincial Response of His Own
Ontario’s involvement matters because Ford is not simply endorsing Ottawa’s retaliation from the sidelines. Provincial reporting indicated that his government was preparing potential measures after Ford discussed the trade situation with Carney. The exact next steps had not been publicly finalized when those preparations emerged, leaving Ontario considerable room to calibrate its response depending on what Washington does next.
There is already a substantial provincial playbook to draw from. During the earlier tariff confrontation in March 2025, Ontario imposed a 25% surcharge on electricity exported to Michigan, Minnesota and New York. The province estimated the measure could affect 1.5 million American homes and businesses and generate between $300,000 and $400,000 per day. Ontario also barred U.S. companies from an estimated $30 billion in annual provincial procurement and removed American alcohol from LCBO shelves. That history gives Ford options that do not depend entirely on Ottawa imposing another customs tariff.
Ottawa Has Now Put Numbers Behind Its Retaliation
The federal response became considerably more concrete Tuesday morning. Finance Minister François-Philippe Champagne announced that Canada would impose new tariffs on C$27.6 billion in U.S. imports, matching the value of the latest American measures. The Canadian duties will take effect September 8 and range from 15% to 50%, depending on the product and the corresponding U.S. tariff rate.
The list reaches across politically and economically sensitive industries. Steel, aluminum, furniture and clothing are among products facing the highest rates, while appliances, dairy products, seafood and certain metal derivatives face 25% duties. Electronics and other products are also included. Ottawa paired the tariffs with C$7.5 billion in new and expanded assistance, including C$1.5 billion for regional tariff-response programs, C$2 billion for diversification projects and C$3.5 billion in rapid-response support for workers and employers. The approach shows retaliation is being designed alongside financial insulation for Canadians who could be caught in the crossfire.
Ontario Has More Economic Exposure Than Most Provinces
Ford’s aggressive posture is easier to understand when Ontario’s dependence on the American market is put into perspective. Federal economic-development data estimate that roughly 933,000 Ontario jobs — about one in nine — depend on U.S. export demand. The United States accounted for approximately 72% of Ontario’s goods exports in 2025, while 46% of the province’s manufacturing sales were exported south of the border.
The concentration becomes even more striking inside individual industries. Ontario’s automotive manufacturing sector employs more than 95,000 people, and vehicles and parts shipped to the United States were worth roughly C$60 billion in 2025. Those shipments represented 96% of Ontario’s automotive exports. Steel and aluminum are similarly exposed: Ontario exported approximately C$6.5 billion of those products to the United States last year, representing 94% of the provincial total. For communities built around assembly plants, parts suppliers, steel mills and tool-and-die businesses, tariff policy can translate quickly into shifts, orders and paycheques.
The Auto Fight Raises the Stakes for Queen’s Park
Automotive manufacturing has become perhaps the most consequential front in the dispute. Trump has threatened to raise tariffs on Canadian automobiles, auto parts and steel to 50% beginning January 1, 2027. That creates several months for diplomacy, but it also creates a difficult planning horizon for automakers deciding where to allocate production, investment and new vehicle programs across North America.
Ontario sits directly in that uncertainty. Ford, General Motors and Stellantis operate major manufacturing facilities in the province, supported by a dense network of suppliers whose components routinely cross the Canada-U.S. border during production. Many of those suppliers are relatively small businesses: federal data show more than 95% of southern Ontario auto suppliers employ fewer than 500 people, yet they account for 61% of the region’s automotive workforce. That structure makes prolonged uncertainty particularly dangerous. A large multinational can redirect capital; a specialized parts company in Windsor, Oshawa or the Greater Toronto Area has far fewer ways to absorb a sudden loss of U.S. business.
Electricity and Critical Minerals Give Ontario Unusual Leverage
Tariffs are Ottawa’s responsibility, but Ontario controls assets that give Ford different forms of leverage. The province supplies electricity directly into Michigan, Minnesota and New York through an interconnected grid. When Ontario imposed its 2025 surcharge, the provincial government said it retained the ability to increase the charge or halt electricity exports altogether if the trade conflict intensified. Ford has revived that possibility during the latest confrontation.
Critical minerals add another dimension. Ford specifically pointed to high-grade nickel and uranium refined in Ontario when discussing potential restrictions. Canada is deeply embedded in U.S. mineral and energy supply chains: Natural Resources Canada reported that Canada supplied 33% of the uranium purchased by U.S. nuclear reactors in 2024, making it their largest foreign uranium supplier. Canada also exported C$28.8 billion in critical minerals to the United States in 2025. Using those flows as leverage would therefore reach beyond consumer prices into manufacturing, energy security and strategic supply chains — which is precisely why such measures would carry significant consequences on both sides.
Ford and Carney Still Need Their Measures to Work Together
The emergence of Ontario-specific retaliation does not necessarily mean Queen’s Park and Ottawa are pursuing competing strategies. Federal and provincial governments have been coordinating their responses, and Finance Minister Champagne recently consulted provincial and territorial counterparts about the new tariff package, affected products and assistance for workers and businesses. The federal government has repeatedly emphasized a “Team Canada” approach even as provinces retain control over areas such as procurement, electricity and provincial liquor systems.
That coordination becomes more important as retaliation expands. A measure that produces maximum political pressure in the United States can still impose costs on Canadian manufacturers that rely on American inputs. Electricity restrictions can affect export revenue. Procurement bans can narrow competition for public projects. Tariffs can raise input costs unless exemptions or remission programs are carefully designed. The challenge for Ford and Carney is therefore not simply identifying ways to hit back. It is finding measures that place meaningful pressure on Washington without inflicting comparable damage on Ontario businesses already coping with weaker trade and prolonged uncertainty.
Canadian Retaliation Is Landing During a Sensitive U.S. Election Season
Canada’s response is unfolding less than three months before the U.S. midterm elections, giving tariff decisions a domestic political dimension in Washington. Several important Senate contests are taking place in states with substantial commercial connections to Canada, including Maine, Michigan, Ohio and Alaska. Republican Senator Susan Collins of Maine has publicly criticized the latest tariffs, warning that businesses and consumers could suffer as trade barriers hit products ranging from seafood and lumber to other cross-border goods.
That creates an incentive for Canadian retaliation to be politically visible as well as economically meaningful. The federal government says its tariff list is designed to protect affected Canadian industries while limiting unnecessary costs at home. But duties on recognizable American products can also make the consequences of the dispute tangible in U.S. communities. Michigan is especially significant for Ontario because its auto industry is tightly integrated with plants across the border. The longer the conflict persists, the harder it becomes for American lawmakers in trade-dependent states to treat Canada policy as a distant foreign-affairs issue.
The Biggest Risk Is Turning Deep Integration Into a Weakness
Canada and the United States remain extraordinarily connected despite the political deterioration. The federal government estimated that approximately C$3.5 billion in goods and services crossed the border every day in 2025. Although Canadian exporters have accelerated diversification, the United States still accounted for more than 70% of Canadian merchandise exports last year. That scale explains both Canada’s vulnerability and its ability to impose meaningful costs when trade suddenly becomes more restrictive.
The economic warning signs were visible before this latest escalation. The Bank of Canada’s July outlook described U.S. trade policy as an ongoing headwind and said uncertainty remained elevated even as economic growth began improving. Statistics Canada has also documented a substantial decline in U.S.-bound exports since the tariff disruptions began. Ontario’s emerging provincial measures and Ottawa’s September 8 tariffs therefore mark more than another exchange of political threats. They represent a test of whether economic pressure can reopen negotiations — or whether two economies built around integration are entering a longer period in which that integration increasingly becomes a source of risk.
