The August 2026 Canada Section 338 Tariff: 50% on Selected Goods

What Changed and When

President Trump signed three Section 338 proclamations on July 20, 2026, each imposing a 50% tariff on a different set of Canadian goods tied to disputes over motor vehicles, alcohol, and dairy. Section 338 of the Tariff Act of 1930 allows the President to impose additional duties of up to 50% on goods from any country found to discriminate against US commerce — it had never been invoked this way before, which is why trade press called it the administration's 'nuclear option.' The tariffs were set to take effect 30 days after signing, 12:01 a.m. ET on August 19, 2026, but hours before that deadline the administration paused it for three days, through the end of the day Friday, August 21, citing progress toward a broader trade deal. That deal did not come together: a further round of talks in Washington broke down, Prime Minister Mark Carney suspended negotiations and recalled Canada's negotiating team, and the 50% tariff took effect as originally scheduled once the pause expired — 12:01 a.m. ET Saturday, August 22, 2026. Carney announced Canada would retaliate with matching dollar-for-dollar tariffs on US goods, and on August 25, 2026 Canada's Department of Finance published the full retaliation list — see the section below for what's covered.

What's Covered

Reporting on the original July 20 proclamations describes coverage spanning motor vehicles, wine and other alcohol, dairy products (including milk and cream), cement, furniture, fishing rods, seeds, clothing, wigs, and hockey sticks and other hockey equipment — three distinct proclamations covering different product groups rather than one blanket list. Cement was later removed from the 50% list effective September 15, 2026 (see the September 8 proclamations section). The binding text is the specific HTS subheadings named in each Federal Register notice; check your product's HTS code against the official notices or with a licensed customs broker before assuming coverage either way.

What's Excluded

The Section 338 tariffs do not apply to energy products, potash, goods already subject to Section 232 tariffs (steel, aluminum, copper, autos already at the Section 232 rate), fish, or critical minerals. Canada's major resource exports to the US — oil, gas, potash, and critical minerals — are carved out of this particular action.

The USMCA Catch

This is the detail that caught a lot of importers off guard once the tariff took effect on August 22, 2026: the Section 338 tariffs apply to covered goods regardless of whether they qualify for USMCA preferential treatment. Under the Section 122 and Section 232 regimes, USMCA-qualifying Canadian goods have generally been shielded or treated favorably. Section 338 works differently — it targets specific goods as a response to specific Canadian policies, and a valid USMCA certificate of origin does not exempt a covered product from it. If you import Canadian autos, alcohol, dairy, or the other named categories, existing USMCA compliance does not protect you from this tariff. Estimate a covered line in the tariff calculator, and see the broader country picture on tariffs from Canada.

The August 19-21 Pause, and Why It Failed

Hours before the tariff was originally due to take effect, President Trump announced a three-day pause, saying the US and Canada had reached the outline of a broader deal covering market access, economic security commitments, and digital trade, with final documents still being worked out. Prime Minister Mark Carney confirmed the postponement ran through the end of the day Friday, August 21. Trade officials held further rounds of talks in Washington through that Wednesday and Thursday, and reporting described the two sides as close on a package that would have cut Canada's existing Section 232 steel/aluminum and auto tariffs. But by the pause deadline, Carney said last-minute changes to the US proposed terms were 'unfair, uneconomic, and called into question the reliability of any deal,' suspended negotiations, and recalled Canada's negotiating team to Ottawa. No proclamation was withdrawn or amended during the pause, so once it lapsed the original 50% duty took effect automatically at 12:01 a.m. ET August 22, 2026.

Canada's Response: Dollar-for-Dollar Retaliation

Carney said Canada would match the new US tariffs 'dollar for dollar' on US goods to protect Canadian workers, farmers, and businesses. On August 25, 2026, Canada's Department of Finance published the complete list. Finance Minister François-Philippe Champagne confirmed counter-tariffs of 15%, 25%, or 50% — each product rate matched to the corresponding US Section 338 or Section 232 rate — covering roughly 700 US product lines worth $27.6 billion (up from the roughly $20 billion originally floated). US steel and aluminum products previously at 25% moved to 50%; appliances, dairy (including cheese), and certain steel/aluminum derivatives sit at 25%; a smaller category — electric equipment and tools — gets 15%. Goods already in transit to Canada on the effective date are exempt. Champagne also announced a multi-billion-dollar support package for Canadian workers and businesses affected by the trade fight. The counter-tariffs took effect 12:01 a.m. September 8, 2026 — the Tuesday after Labor Day, with no last-minute deal reached. Provincial leaders, including Ontario Premier Doug Ford, backed Carney's response. See Canada's official product list at canada.ca for the full HTS-line detail. Separately, and on a different track: on August 22, 2026 Carney announced Canada would remove its own retaliatory tariffs on US goods that qualify under CUSMA, effective September 1, 2026. That CUSMA rollback took effect September 1, while this non-CUSMA counter-tariff list took effect September 8. Canada kept retaliatory tariffs on US steel, aluminum, and non-CUSMA-compliant vehicles in place.

September 8: Trump Signs Five More Proclamations

Hours after Canada's counter-tariffs took effect, President Trump signed five additional Section 338 proclamations on September 8, 2026. Three of them ban rather than tariff a set of Canadian goods from entering the US outright: most packaged alcoholic beverages (beer, wine, cider, whisky, vodka, and other spirits), non-alcoholic beer, whey and molasses products, and motorcycles/mopeds with engines over 800cc. Those bans took effect as scheduled at 12:01 a.m. ET September 29, 2026, covering roughly 68 HTS lines. Goods imported before that deadline but not yet entered for consumption remain subject to the existing 50% Section 338 tariff rather than the ban. The other two proclamations modify the product scope of the existing 50% Section 338 tariff, effective 12:01 a.m. ET September 15, 2026: all-terrain vehicles, animal hides, mattresses, lamps, and motorboats are added at the 50% rate, while rock salt and cement are removed from it. That September 15 scope change has taken effect. The White House characterized the moves as a response to Canada's 'increased discrimination against U.S. commerce' and its own September 8 counter-tariffs. If you import any of the banned or added categories from Canada, confirm your specific HTS code against the official Federal Register notices — an import ban means the goods cannot legally enter the US at any duty rate, which is a materially different risk than a 50% tariff.

How to Check a Shipment Against This Tariff

1. Check whether your specific HTS code falls under one of the proclamations — don't rely on a product-category summary, confirm against the official Federal Register notices or with a licensed customs broker.
2. Don't assume USMCA protects you. A valid certificate of origin does not exempt covered goods from this tariff.
3. The 50% duty has applied since 12:01 a.m. ET August 22, 2026. Estimate a current shipment in the tariff calculator. Country-level rates are on tariffs from Canada.
4. If you also export to Canada, check the published retaliation list. Countermeasures took effect September 8, 2026 — Canada's Department of Finance published the full ~700-line product list on August 25, 2026, with rates of 15%, 25%, or 50% depending on the product.