Toyota and Honda may end up carrying the cost of U.S. President Donald Trump's tariffs on Canada, Reuters reports — a prospect that lands squarely on two of the largest vehicle producers operating plants on both sides of the border.

The report centers on a question now facing every automaker with Canadian manufacturing exposure: who pays when a 25 percent-style trade barrier hits vehicles and parts that cross the U.S.-Canada line multiple times before final assembly. For Toyota and Honda, the stakes are unusually high. Both companies run substantial production operations in Canada and sell the bulk of their Canadian-built output in the United States, the market Trump's tariff policy targets.

Reuters frames the risk as one of absorption rather than pass-through. If the automakers cannot shift the tariff burden onto consumers through price increases — a move that would dent demand in an already cooling U.S. new-vehicle market — the duty payments fall on the manufacturers themselves. That dynamic threatens margins on some of the highest-volume models in both companies' North American lineups.

The situation also complicates longer-term capacity planning. Automakers weighing where to allocate production between U.S. and Canadian plants now face a cost structure that can change with each policy announcement. Shifting output is neither quick nor cheap: retooling a plant, requalifying suppliers and rebalancing logistics typically take years, not months, and the tariff landscape may look different by the time any such move is complete.

For the supply base, the signal is equally troubling. Tier suppliers that feed Toyota's and Honda's Canadian assembly operations ship components across the border daily. Tariffs applied at each crossing multiply the cost exposure, and suppliers with thin margins have little room to absorb it before pushing price claims upstream to their OEM customers — precisely the outcome Reuters suggests the Japanese automakers may have to finance.

Notably, neither automaker has confirmed how it intends to handle the added cost. Reuters' assessment of who "gets stuck with the bill" remains a projection, not a stated corporate plan. Toyota and Honda have historically absorbed currency and trade shocks to protect market share, but the scale of a sustained tariff regime on Canadian production would test that playbook in ways past disruptions have not.

What to watch next: whether Toyota and Honda announce pricing actions, production reallocations or public cost estimates in upcoming quarterly results; whether the White House adjusts or exempts automotive-specific tariff lines; and whether Canadian officials negotiate a carve-out that protects the integrated vehicle and parts flows that define North American auto manufacturing.