General Motors Co. and Stellantis NV will be forced to pay tariffs on some U.S.-made vehicles they import for sale in Canada, after the companies decided to reduce assembly-line work at factories in Ontario.

Canada put tariffs of as much as 25% on U.S.-made cars and light trucks in April in retaliation for President Donald Trump’s levies on foreign vehicles. But Prime Minister Mark Carney’s government also carved out an exemption — known as “remission” — for automakers that make vehicles in Canada.

That exemption allowed auto companies to continue importing vehicles into Canada without paying tariffs, as long as they kept producing and investing in Canadian factories. But Stellantis will now see its quota of tariff-free vehicles slashed by 50% and GM will face a 24% reduction, according

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