Who Wins and Who Loses in the US-Canada Trade War

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The U.S.–Canada trade war is testing a promise both governments make: that tariffs can protect their country’s workers.

Protection for one domestic producer can become a higher bill for another. A factory buying taxed materials can find savings elsewhere, accept a smaller profit or charge its customers more. The policy that helps keep one mill open can therefore squeeze another employer or reach workers through the prices they pay.

A tariff starts as an import bill

The person or business responsible for the customs entry, called the importer of record, is responsible for applicable duties, taxes and fees even when it hires a customs broker, according to U.S. Customs and Border Protection. The border bill and the final economic burden are different questions.

Businesses can respond by negotiating with suppliers, changing suppliers or production methods, accepting lower profit margins, or passing costs to customers, Federal Reserve officials reported in their July 2025 meeting minutes. A lower margin means the business absorbs part of the cost; a higher selling price moves part of it to a buyer. There is no rule that every tariff becomes an equal percentage increase at the checkout.

The base used to calculate the tax matters as much as the headline rate. For approved passenger vehicles and light trucks qualifying under the United States-Mexico-Canada Agreement (USMCA), the 25 percent automobile tariff applies only to the value of non-U.S. content. That is a charge on a defined portion of the vehicle, not automatically on its entire selling price.

The current rules depend on the product

The Canada-specific tariffs imposed under Section 338 of the Tariff Act of 1930 took effect on August 22, 2026, after the two governments failed to reach an agreement. They imposed a 50 percent duty on specified Canadian goods in response to what President Donald Trump described as discrimination against U.S. commerce involving alcohol, dairy and motor vehicles.

The White House changed the covered product lists effective September 15, 2026, removing goods including rock salt and cement while adding others. Import bans on certain Canadian goods took effect on September 29, 2026. An import ban closes a route to the market; it is different from leaving that route open at a higher tax.

Covered Section 338 goods do not escape those duties simply because they qualify under USMCA, and the September changes allow those duties to apply on top of Section 232 industry tariffs. The agreement and the tariff program therefore have to be checked separately.

The Congressional Research Service updated its U.S.-Canada trade report on September 16, 2026. This comparison is a starting point; product exceptions and the separate Section 338 measures still matter.

Energy and potash were excluded from the Canada-specific Section 338 measures announced in July 2026. That exclusion should not be read as a blanket exemption from every customs charge.

The energy relationship also has a physical foundation: existing pipelines connect the markets, and relatively complex U.S. refineries tend to prefer heavy crude oil such as Canada produces, the Energy Information Administration reports.

The earlier emergency-tariff program is a separate chapter: Customs and Border Protection ended collection of the listed International Emergency Economic Powers Act duties, including the Canada measure, for entries beginning February 24, 2026.

Protection helps producers and raises input costs

The American Iron and Steel Institute, a steel industry trade group, says the steel import measures begun in 2018 allowed mills to restart, workers to be rehired and investment in new or upgraded plants. The institute argues that a commercially viable domestic steel industry is necessary for national security.

In July 2025, the institute and four other steel groups urged the administration to retain steel tariffs during trade negotiations and avoid country deals that would reduce coverage. The groups argued that foreign subsidies and unfair trade practices encouraged overproduction, while U.S. capacity utilization remained below the Commerce Department's goal.

Manufacturers that use imported materials make a different case: the National Association of Manufacturers says tariffs increase the cost of raw materials, equipment and machinery needed to make things in America. The association estimates that even at full domestic production capacity, at least 16 percent of manufacturing inputs would still have to be imported. The association proposes preapproved duty-free access to necessary manufacturing inputs through a Manufacturing Tariff Speed Pass. That request exposes the central tension: protecting a material producer and lowering a material buyer's costs are different objectives.

Canada and the United States have highly integrated automotive and energy markets, according to the Congressional Research Service. The manufacturers association says Canadian and Mexican suppliers provide materials, parts, machinery and equipment that power American factories. Moving the final assembly of a product does not by itself answer where every input will come from or what it will cost.

Retaliation creates another set of domestic costs

Canada’s response included countertariffs of 25 percent on appliances and dairy products, and 50 percent on specified steel and aluminum products, furniture and clothing. Some Canadian steel and aluminum countertariffs rose from 25 to 50 percent, while other existing countertariffs, including those on autos, remained in place.

Canada says its response is intended to protect producers harmed by U.S. tariffs and improve their competitive position in the Canadian market. Its official regulatory analysis also acknowledges that Canadian importers, distributors and retailers continuing to buy affected U.S. goods may pass some or all additional costs to businesses or consumers. Retaliation can put pressure on American sellers while making purchases more expensive inside Canada.

Canada removed fish and seafood from its countertariff list after stakeholders warned about potential harm to domestic fish processing, according to the Canada Gazette. A measure aimed across the border can therefore require an exception to protect businesses at home.

U.S. goods trade with Canada totaled an estimated $715.5 billion in 2025, including $333.6 billion in American exports and $381.9 billion in imports, according to the Office of the U.S. Trade Representative. Canada sent 71.7 percent of its merchandise exports to the United States that year, Statistics Canada reports. The dispute reaches a large trading relationship, but Canada's exposure to its biggest export market is especially concentrated.

The Bank of Canada's April 2026 sector analysis reported that Canadian steel exports had fallen by half, with smaller declines in production and employment partly cushioned by government measures. Export sales, domestic production and employment need not fall by the same amount. Domestic support can cushion losses without restoring the foreign market that exporters previously served.

Jobs and investment are a harder test

The White House says its tariff policy is intended to strengthen American manufacturing, improve access to foreign markets and support workers and families. Canada says it seeks a comprehensive agreement that protects workers, gives businesses more certainty and respects Canadian sovereignty. Those objectives describe what the governments want; outcomes must be measured separately.

Federal Reserve economists Aaron Flaaen and Justin Pierce found that U.S. manufacturing industries more exposed to the 2018-2019 tariff increases experienced relative reductions in employment. In their analysis, larger losses from higher input costs and retaliation outweighed the positive employment effect of import protection, while input costs also pushed producer prices up. A gain at a protected mill is therefore compatible with losses elsewhere in manufacturing.

That earlier episode is evidence about a mechanism, not a numerical forecast for today's dispute. The current tariff mix, exemptions and restrictions differ, and the study compares industries with different exposure rather than counting every current gain and loss.

The manufacturers association says long-term investment requires stable trade policy and reliable access to critical inputs. The Bank of Canada reported in January 2026 that uncertainty had made some Canadian businesses and U.S. customers reluctant to trade with one another. It also warned that finding new markets and building export supply chains would take time and be costly.

What could change the balance

The United States declined to renew USMCA in its existing form at the July 2026 joint review, but the agreement remained in force, the U.S. Trade Representative announced. A refusal to renew at that review was not an immediate cancellation of the agreement. Without renewal, USMCA is set to expire in 2036, according to the Congressional Research Service.

Separately, Prime Minister Mark Carney suspended bilateral trade negotiations on August 21, 2026 and directed Canada’s negotiators to return to Ottawa. In a September 4, 2026 update, Minister Dominic LeBlanc said Canada remained committed to constructive engagement toward a mutually beneficial agreement that respected Canadian sovereignty. Those bilateral tariff talks and the three-country USMCA review are distinct processes.

The legal basis matters too: ending one tariff program does not automatically end the others. Customs and Border Protection said the termination of the emergency duties did not affect duties under Section 232 or Section 301.

Importers can request a written Customs and Border Protection ruling on a product's proper tariff classification and duty rate. Check the current tariff schedule and the agency's trade-remedy notices for the exact product, then establish whether the relevant agreement exemption and any additional industry tariff apply.

Shipment from Canada alone does not establish an agreement exemption: a product must satisfy the applicable USMCA rule of origin. Customs and Border Protection says USMCA requires a certification of origin containing the nine minimum data elements in Annex 5-A, with no required format. Origin documentation supports an available exemption; it does not create an exemption in a tariff program that has none.

Canadian businesses can request exceptional tariff relief when affected inputs cannot be sourced domestically or reasonably from non-U.S. suppliers, or when other exceptional circumstances could severely harm the economy. Canada's Department of Finance assesses those remission requests, and relief requires exceptional and compelling public-policy grounds.

For a worker or business, the revealing question is where it sits in that chain: protected seller, buyer of taxed inputs, exporter facing a countertariff, or some combination. The same border measure can improve one business's prospects while weakening another's, even when both employ people in the country imposing it.