Trade negotiations between the United States and Canada collapsed on August 21, 2026, just before a midnight deadline, triggering a 50% tariff on roughly $20 billion worth of Canadian imports into the US under Section 338 of the Tariff Act of 1930. Prime Minister Mark Carney recalled his negotiators from Washington and announced retaliatory tariffs targeting US steel, dairy, electronics, and appliances, set to take effect on September 8. The S&P/TSX Composite Index swung in both directions before stabilizing near flat on August 24, while the Canadian dollar dipped modestly against the US dollar, as investors appeared to view the situation as a serious but manageable disruption. Annual bilateral trade between the two countries exceeds $800 billion, with automotive manufacturing, steel production, and agriculture being the most exposed sectors. The September 8 date for Canadian retaliatory tariffs represents the next major pressure point, carrying direct risk for investors with exposure to Canadian equities in these sectors and energy.
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