Canada's dollar-for-dollar tariffs on $20 billion of U.S. goods take effect

Canadian retaliatory tariffs on about $20 billion of U.S. goods came into force just after midnight Eastern time on Tuesday, 8 September. Rates run from 15 to 50 percent. The list includes steel and aluminum products, milk and cream, cheese, furniture, clothing, household appliances, plywood, sunscreen and industrial equipment. American milk, golf clubs, jackets and T-shirts face 50 percent. Fresh cheese, toilet paper and some air conditioners face 25 percent. Several steel items move from a prior 25 percent duty to 50 percent.

Ottawa designed the package as a mirror. In late August President Donald Trump imposed 50 percent tariffs on roughly $20 billion to $28 billion of Canadian exports after negotiations collapsed. That U.S. list covered wine, furniture, dairy, cement, clothing, fishing rods, hockey equipment and honey, among other lines. Canadian officials say their counter-list is drawn from the same value of trade. Prime Minister Mark Carney had already called the U.S. step a plan "designed to hurt and divide us." He has also described Canada's reply as dollar-for-dollar.

The fight is 18 months old. About 68 percent of Canadian exports still go to the United States this year. Roughly 80 percent of that flow has been moving duty-free under USMCA exemptions, which is why the new lists, large as they sound, still touch only about 5 percent of Canada-to-U.S. export value. The danger named by trade groups is not the first $20 billion. It is the next round. Trump has threatened to lift tariffs on Canadian cars, trucks and auto parts to 50 percent from 1 January. He also signed an order renaming Lake Ontario as Lake America, a gesture that tells you the temperature.

Michael Harvey, who leads the Canadian Agri-Food Trade Alliance and has advised Carney, said the fear is a vicious cycle and that he understands why the prime minister wants leverage. Carney said last week that Canada was ready to sign a deal that helps both countries. Officials on each side blame the other for last-minute demands that killed a text that had looked close two weeks earlier.

USMCA itself is under stress. The pact that replaced NAFTA is up for review. Trump has refused a simple extension. A tariff war that starts in dairy and hockey sticks can end in the auto plants that actually bind the two economies. Windsor-Detroit truck traffic, steel that crosses the river twice in one manufacturing cycle, and furniture plants that buy American lumber all sit on the new lists.

Carney has been telling Canadians that shifting away from a single customer is now policy, not a slogan. That shift takes years. The tariffs that started at midnight take effect in one night. Importers will pay first. Consumers will see it in cheese, appliances and clothes. Exporters on both sides will see it in cancelled orders. The political test is whether either capital uses the pain to reopen talks or to write a longer list in January.

One concrete way to read the new Canadian schedule is by product. Fifty percent on U.S. milk is a dairy-for-dairy reply. Fifty percent on steel rods, bars, sheets, bridges, towers and window frames is an industrial reply. Twenty-five percent on softwood pine, fir and spruce is a lumber reply. The schedule is a map of which American districts Ottawa wants to hear from.