Ontario exporters and manufacturers are facing a sudden and severe shock after the White House followed through on a 50 per cent tariff affecting roughly $28 billion of Canadian goods, including steel, aluminium and auto parts. The move comes after last-ditch negotiations between Ottawa and Washington collapsed Friday night.
Immediate toll on Ontario's trade and industry
Items targeted by the tariffs made up about nine per cent of Ontario's total exports to the United States in 2025, according to Statistics Canada figures cited by federal officials. That exposure has business owners, industry groups and provincial leaders scrambling to understand the short- and medium-term consequences for factories, suppliers and workers across the province.
Scarborough-based Kimberly Turner-Briscoe, president of a steel fastener supplier and distributor, described sleepless nights trying to keep her company afloat amid the U.S.–Canada trade confrontation. Over recent years she said her business has pivoted away from the U.S. market and reduced staff to survive. Turner-Briscoe welcomed negotiators’ decision to walk away from an unacceptable deal, even as she expressed disappointment at the imposition of tariffs and Canada's own 25 per cent sectional tariffs on fasteners.
"Don't back down. No deal is better than a bad deal,"
Those words, delivered as a message to the Canadian government, reflect a difficult calculus shared by some Ontario business owners: tolerate short-term pain rather than accept terms they view as harmful in the long run.
Ottawa's response and retaliatory measures
Prime Minister Mark Carney said Saturday morning that the U.S. proposal was "uneconomic, unfair and undermine[d] the net benefits to Canada." He said Canada is "reluctantly" preparing retaliatory tariffs on a dollar-for-dollar basis across several sectors, naming dairy, steel, paper and electronics among the categories that could face countermeasures. Those retaliatory duties are planned to take effect after Labour Day, he said.
For Ontario — home to a large share of Canada's steelmaking, auto manufacturing and related supply chains — the announced U.S. duties threaten to upend trade flows that have been built over decades, particularly for firms that rely on cross-border sourcing and just-in-time production.
- Tariff rate: 50 per cent on targeted goods
- Value affected: Roughly $28 billion in Canadian exports
- Ontario exposure: Items represent ~9% of Ontario exports to the U.S. in 2025
Local impacts: manufacturers, suppliers and workers
Manufacturers that supply the auto sector or produce steel and aluminium components could see sudden price shocks or loss of market access. Smaller suppliers, which already operate on thin margins, are especially vulnerable. Turner-Briscoe's account of layoffs and strategic shifts mirrors concerns expressed in industry circles: some firms may accelerate moves to diversify away from the U.S., while others could seek government supports to bridge the disruption.
Ontario Premier Doug Ford publicly backed negotiators who rejected what he called a "bad deal" for the province's steel and auto sectors, and pledged provincial support for affected workers and businesses. Details on provincial assistance have yet to be released.
What businesses should consider now
Companies confronted with new duties and retaliatory measures should assess immediate exposure, review supply contracts and tariff classifications, and consult trade advisers about mitigation options such as re-routing sales, adjusting sourcing or applying for government assistance programs. Firms that export heavily to the U.S. will likely seek clarity from Ottawa on compensation, temporary supports, and timelines for any countermeasures.
| Item | Detail |
|---|---|
| Tariff rate (U.S.) | 50% |
| Value of targeted exports | $28 billion |
| Ontario export share (2025) | ~9% of provincial exports to U.S. |
| Canada's proposed retaliation | Dollar-for-dollar tariffs after Labour Day on several sectors |
The coming days will likely see industry associations, provincial ministries and federal trade officials issuing guidance and seeking emergency consultations with affected businesses. For many Ontario companies, the choice will be whether to absorb costs, pass them to customers, pivot to alternative markets, or reduce operations — all while awaiting Ottawa's next moves.
As this dispute unfolds, the tensions between protecting domestic industries and preserving integrated cross-border commerce will be starkly visible in Ontario's factory towns and suburban manufacturing hubs. The decisions taken in Ottawa and Washington over the next weeks will determine whether the province's employers can ride out a painful adjustment or face deeper, longer-term damage to jobs and investment.
Reporting from Ontario; more developments expected as governments and industry respond.
