Canada's retaliation doesn't land until September 8 — three weeks after U.S. tariffs hit

U.S. 50% tariffs on roughly $20 billion in Canadian imports took effect August 19. Canada's matching retaliation on $20 billion in U.S. goods starts September 8. That three-week gap means Canadian exporters already pay higher U.S. rates while American exporters face no new Canadian duties yet — leaving cross-border businesses absorbing interim costs with little time to adjust.