Canada's counter-tariffs of up to 50% take effect on 8 September

Canada begins collecting new surtaxes on a wide list of American goods on 8 September. The rates are 15, 25 and 50%, set to match the US duties that landed on Canadian exports after trade talks failed in late August. Finance Minister François-Philippe Champagne's department put the covered import value at C$27.6 billion, the same order of magnitude as the Canadian goods Washington had just taxed.

Prime Minister Mark Carney had promised a dollar-for-dollar answer. The list published after that promise runs to more than 700 tariff lines. Steel and aluminium products that already faced a 25% Canadian counter-duty move to 50%. Furniture and some clothing sit at 50%. Appliances, cheese and certain steel derivatives sit at 25%. A smaller group, including some air-conditioning units and tool parts, sits at 15%. Softwood and hardwood products, pulp, paper, boxes and toilet paper fall in the 25 to 50% band. Fish, frozen and fresh, is on the list. So are hockey sticks.

Cars are treated as a separate file. Canada will keep its retaliatory duty on American-built vehicles at 25% and will keep the quota system that lets firms assembling in Canada bring in a limited number of US-built cars without the extra tax. That carve-out is how Ottawa tries to protect the integrated plant network that still runs across the Detroit-Windsor corridor even as the rest of the tariff war widens.

The US move that triggered the list was a 50% tariff on about $20 billion to $27.6 billion of Canadian goods, imposed after three days of talks collapsed on 21 and 22 August. Those US duties did not exempt CUSMA-originating goods in the way the earlier round had. Carney's phrase at the Ottawa press conference was direct: Canada had been attacked and would match the new tariffs dollar for dollar to protect workers, farmers, families and firms.

Champagne called the package a focused response. The focus is sectors already hurt by the US list: steel, dairy, appliances, farm equipment, pulp and paper, electronics. The political aim is to put pain on American producers who sell into Canada while leaving some consumer space at the 15% tier. Whether that targeting works depends on how easily Canadian buyers can switch to Mexican, Asian or domestic supply. A dishwasher and a tonne of cold-rolled coil do not have the same substitutes.

For companies the operational fact is the date. Goods that enter on 8 September face the new rates. Importers who brought inventory forward in late August bought themselves days, not a strategy. US exporters of steel, appliances and paper into Ontario and Quebec will find contracts that were written against a 25% surtax now priced against 50%. Canadian users of those same American inputs will file for remissions where the department has left a window and will pay where it has not.

The broader relationship is worse than it has been since the first Trump term. CUSMA still exists. Large volumes of qualifying goods still move under it. The new US 50% list punched a hole in that shelter. Canada's reply punches back through the same hole. Neither government has put a fresh negotiation date on a calendar.

What 8 September changes is the price of a specific set of American products on Canadian docks. What it does not change is the auto quota, the underlying treaty, or the fact that the two economies still buy from each other every hour. Traders will spend the week repricing steel, cheese and washing machines. The two capitals will spend it deciding whether the next conversation is about widening the lists or about climbing down. The lists, as of Monday, come into force tomorrow.