Effective September 8, 2026, the Canada Border Services Agency doubled its surtax on select U.S. steel and aluminum goods, from 25% to 50%, on shipments that may already be en route. This is the fourth amendment to Customs Notice 25-11, the order that governs the Canada steel surtax since it was first imposed in March 2025, and it’s Canada’s direct response to the United States imposing new Section 338 tariffs on a range of Canadian goods. For trade teams, the immediate problem isn’t the policy debate. It’s that the same HS number that sat in one surtax bucket last week may sit in a different one this week, and getting it wrong now costs twice what it used to. It’s a live rate change, already in effect on today’s shipments.
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