Canadian retaliatory tariffs of 15% to 50% on nearly $20B of US imports took effect at 12:01am Eastern on Tuesday September 8 2026, covering steel, household appliances, agricultural equipment, dairy, machinery, textiles and consumer products. They match US levies of 50% on $20B of Canadian goods imposed after negotiations broke down, with Prime Minister Carney calling Washington's conditions uneconomic, unfair and damaging to the net benefits for Canada.