Canada’s retaliation against U.S. tariffs stopped being a negotiating threat Tuesday morning.
At 12:01 a.m. on September 8, Canadian customs began applying counter-tariffs of 15%, 25% and 50% to U.S.-origin goods covering C$27.6 billion of imports, according to the Department of Finance Canada. The measures match U.S. Section 338 tariffs “dollar for dollar,” with additional products drawn from sectors affected by Section 232 duties.
The distinction between the announcement and Tuesday’s implementation matters. Prime Minister Mark Carney announced the retaliation on August 22, but the government’s product schedule was subsequently updated on August 26. The final Finance Canada figure is C$27.6 billion, materially above the roughly US$20 billion figure widely reported when the policy was first announced.
For markets, the immediate issue is less the individual products than what another layer of tariffs does to the Canadian dollar, North American industrial costs and deeply integrated cross-border supply chains.
Canada Tariffs Hit Steel, Dairy and Industrial Goods
Finance Canada’s final schedule puts some of the highest 50% duties on dairy products including concentrated milk and whey, alongside parts of the steel and aluminum complex. The list also covers products including plywood, pulp and paper, textiles, clothing, glass goods, tubes, pipes, structural steel, fasteners and other metal products.
A 25% band applies to products including numerous cheeses and parts of the lumber, paper, carpet and appliance categories. Certain machinery, including forklifts, industrial robots and handling equipment, appears in the 15% band.
The government says the broader counter-tariffs are concentrated in steel and aluminum, dairy, appliances, agricultural equipment, pulp and paper, plastics and electronics.
That makes the measures relevant beyond retail prices. Steel and aluminum tariffs feed into manufacturing and construction inputs, while duties on machinery and electronics can raise equipment costs throughout Canadian businesses.
The Canadian Dollar Is Already Trading the Risk
The tariff start coincided with renewed pressure on the loonie. USD/CAD rose about 0.27% to 1.3876 during Tuesday’s session, putting the Canadian dollar around its weakest level since August 19 as markets assessed the combination of tariffs, growth risks and higher cross-border costs.
That is not a clean one-factor tariff trade. Oil, U.S. interest-rate expectations and broader global volatility are also moving the pair. But the tariff regime adds another domestic inflation-versus-growth problem for Canadian policymakers: import costs can rise at the same time that trade uncertainty weighs on investment and activity.
FinanceFeeds flagged the escalating Canada-U.S. tariff dispute as an FX risk in its August 26 market summary, when the measures were still scheduled for September.
That risk is now live.
Carney Said the Retaliation Would Carry a Domestic Cost
Carney described the measures on August 22 as a “focused response” aimed at defending Canadian industries against U.S. tariffs. He also acknowledged the domestic trade-off, saying the action would “raise costs and reduce choice for Canadians.”
That concession is important for the next phase of the trade dispute. Ottawa is trying to create leverage against Washington while limiting damage to its own consumers and businesses.
The final rules apply only to goods considered U.S.-origin under Canada’s CUSMA country-of-origin rules. Goods already in transit to Canada when the countermeasures came into force are excluded. Finance Canada directs importers to Canada Border Services Agency customs notices for the detailed administration of the tariffs.
For brokers, payments companies and other financial firms operating across both countries, the effect is indirect but immediate: higher input prices, renewed CAD volatility and more uncertainty over the cost base of clients exposed to North American trade.
The August tariff announcement was a future risk. As of Tuesday morning, it is part of the price.