What Canada’s Retaliatory Tariffs Mean for U.S. Manufacturers and the Supply Chain

Manufacturers on both sides of the U.S.-Canada border have long treated North American trade as a relatively stable proposition. That assumption is now being tested.

Canada’s newly enacted “dollar-for-dollar” retaliatory tariffs on U.S. imports are adding another layer of uncertainty to supply chains already struggling with higher costs and increasingly complex requirements. Impacting far more than finished products, the greatest risk resides deeper in the supply chain, with the intermediate materials, components and machinery that keeps production moving.

The greatest effects of the newly imposed tariffs are likely to concentrate where three conditions overlap: heavy dependence on Canadian inputs, no near-term substitutes and tariffs imposed by multiple authorities. A fourth multiplier hits companies who sell north, as outbound taxes increased as of September 8.

Aluminum-intensive manufacturers are among those facing the greatest exposure. Canada supplies roughly two-thirds of U.S. primary aluminum, while domestic smelting covers only about 15% of U.S. demand. With tariff rates approaching 45% to 50%, companies producing cans, transportation equipment, electrical products and building materials cannot simply switch suppliers overnight. 

The automotive industry faces a different but equally serious problem. Vehicle content can cross the border multiple times during production, potentially incurring a tax each time. New tariffs as high as 25%, in addition to tariffs covering hundreds of auto parts, can turn what once looked like a manageable cost increase into a threat to suppliers’ financial health. OEMs may have some ability to pass higher costs to customers, but Tier 2 and 3 suppliers often do not. 

Impacts Beyond Aluminum and Automotive

Manufacturers of products made of wood, or those producing construction materials, face duties from other trade measures. For example, lumber tariffs will be greatly impacted by Sections 232 and 338, adding cost to products such as veneers, mouldings, fiberboard, doors and plywood. Paper, pulp and packaging create another problem because the same material can effectively be exposed on both sides of the border. U.S. tariffs affect Canadian containerboard and tissue, while Canada applies retaliatory tariffs to U.S. pulp and kraft products. The consequences extend beyond the paper industry because virtually every manufactured product eventually needs packaging.

Machinery, electrical equipment, chemicals and plastics are also vulnerable. Section 338 impacts products many companies did not initially screen for, including industrial and agricultural equipment, food-processing machinery and telecommunications equipment. Those potential costs weren’t identified if you’re making cars, cheese or whiskey. Companies then get squeezed from both ends due to Canadian retaliation that taxes U.S. exports such as forklifts, harvester parts and HVAC equipment.

For food and beverage processors, the greatest vulnerability may not be the food itself but the materials and equipment used to produce and package it. Aluminum cans, tinplate, glass containers and processing machinery can all add cost to an industry already operating on tight margins.

How Should Supply-Chain Leaders Respond?

Simply put, they must move quickly. Map tariff exposure at the eight-digit tariff classification level rather than relying on broad product categories. A company that simply asks whether it imports automobiles, dairy or alcohol can easily miss exposure in machinery, plastics, paper or electronics. 

Then there’s recovery. Some Section 338 duties may be eligible for drawback when goods are subsequently exported, potentially turning a major tariff cost into a documentation challenge. Companies should preserve customs records, identify affected entries and monitor potential legal challenges rather than wait until liquidation deadlines approach.

Lastly, companies must revisit their commercial agreements. Contracts written pre-2025, when North American tariffs were relatively stable, might not adequately address today’s environment. Change-in-law provisions, tariff-sharing arrangements and importer-of-record responsibilities all need to be examined. Companies should also consider the outbound side of the equation. Canadian tariffs raise the landed cost of U.S.-origin goods, including many intermediate products.

Preparing for an Uncertain Future

These are not temporary issues, and companies can’t afford to treat them as such. Improved trade data, greater sourcing flexibility and faster decision-making are critical moving forward. Factors such as classification, origin and valuation information must become inputs into pricing, product design, capital investment and contract negotiations.

Manufacturers should also distinguish between durable trade policy and measures that may be more vulnerable to legal or political change. Building a new plant because of a tariff that may disappear can create stranded capital. A stronger strategy is to test investments against both tariff-on and tariff-off scenarios. The biggest risk may be assuming the next escalation will simply be another tariff. 

The U.S.-Canada trading relationship remains deeply integrated. For manufacturers, the goal now is not to predict the next tariff announcement, but to build a supply chain that’s resilient enough to withstand whatever comes next.

Kyle Peacock is the founder of Peacock Tariff Consulting.