Trump Threatens 50% Canada Auto Tariffs Jan. 1 — LTU Expert Warns Michigan Could Pay The Price

DETROIT — President Donald Trump has threatened to double U.S. tariffs on Canadian cars, trucks and automotive parts to 50% on Jan. 1, 2027 — a move a longtime General Motors executive warns could hammer Michigan automakers and suppliers, threaten jobs and ultimately make vehicles more expensive.

Warren Browne, a former global General Motors executive who spent roughly four decades in the auto industry and now serves as an adjunct professor at Lawrence Technological University, says Michigan is especially vulnerable because its automotive economy is deeply intertwined with Canada’s.

In a new MITechNews video interview, Browne explains why he believes a 50% tariff could do far more than hurt Canadian manufacturers.

It could come back across the border and hit Michigan.

“If 50 percent tariffs are imposed on Canadian auto exports, and Canada retaliates by imposing 50 percent tariffs on the U.S., it will destroy both auto industries,” Browne said.

Jan. 1 Is The Date To Watch

Trump announced Aug. 24 that he would raise tariffs on Canadian cars, trucks and automotive parts from 25% to 50% beginning Jan. 1, 2027, after U.S.-Canada trade negotiations broke down. Reuters

The president’s argument is that tariffs will encourage manufacturers to move more production into the United States.

“Build in the U.S. and there are ZERO TARIFFS,” Trump said when announcing the threatened increase. Reuters

But the 50% tariff has not yet taken effect, and industry officials remain hopeful Washington and Ottawa can reach an agreement before January. Reuters reported that some auto executives also remain skeptical that the threatened tariff will ultimately be implemented because previous tariff threats have been delayed or changed. Reuters

Browne’s concern is what happens if this one isn’t.

Why Michigan Could Get Hit

A modern automobile isn’t necessarily built in one city — or even one country.

The North American auto industry has spent decades creating an integrated manufacturing network in which vehicles and components move between the United States, Canada and Mexico.

Michigan and Ontario are at the heart of that system.

Engines, transmissions, electronics and other components can cross the U.S.-Canada border during different stages of manufacturing before a finished vehicle reaches a dealership.

That’s why Browne argues that a tariff intended to punish Canadian manufacturing can also increase costs for Michigan manufacturers.

Flavio Volpe, president of Canada’s Automotive Parts Manufacturers’ Association, made a similar point following Trump’s announcement, saying U.S. assembly plants depend on Canadian components and could be forced to halt without them. Reuters

Browne: Tariff Costs Already Add Up

Browne has been tracking the financial impact of tariffs on automakers.

In 2025, he calculated that existing tariffs were running at approximately $2,200 per vehicle on an annualized basis.

That’s important because automakers have several choices when their costs rise: absorb the expense, pressure suppliers to cut prices, change where they manufacture vehicles and components — or eventually pass some of the cost to consumers.

Doubling the Canadian automotive tariff to 50% could increase that pressure.

Reuters reported that Canadian-made vehicles accounted for about 6% of U.S. vehicle sales in 2025. But the impact extends beyond finished vehicles because the proposed 50% levy also covers Canadian automotive parts used by U.S. factories. Reuters

That directly raises the stakes for Michigan.

Michigan Suppliers Could Feel It Quickly

The impact wouldn’t stop with Ford, General Motors and Stellantis.

Michigan’s automotive economy includes thousands of companies making tooling, electronics, plastics, seats, precision components and other products.

A Michigan supplier doesn’t necessarily have to be directly tariffed to get hurt.

If a Canadian assembly plant cuts production because vehicles become too expensive to export to the United States, that factory needs fewer Michigan-made components.

Conversely, if a Michigan assembly plant depends on Canadian components whose cost rises because of tariffs, producing vehicles in Michigan becomes more expensive.

Browne says that’s why treating the U.S. and Canadian auto industries as completely separate economies doesn’t reflect how vehicles are actually manufactured.

Could Plants Shut Down Within Days?

There’s another risk: inventory.

The automotive industry relies heavily on just-in-time manufacturing. Instead of stockpiling months of components, factories receive parts according to carefully coordinated production schedules.

Browne believes a severe disruption of cross-border automotive trade could begin shutting down assembly operations within seven to 10 days.

That’s Browne’s forecast rather than an industrywide projection, but history demonstrates how quickly a border disruption can affect auto production.

The 2022 Ambassador Bridge blockade disrupted manufacturing on both sides of the Detroit River as automakers struggled to obtain needed components.

With a 50% tariff, the disruption would be financial rather than a physically blocked bridge, but Browne argues that the underlying vulnerability is similar: Michigan plants need Canadian parts, and Canadian plants need American parts.

The Jobs Question

Canada has substantial exposure because its auto industry depends heavily on access to the U.S. market.

But American workers aren’t insulated from what happens in Ontario.

A Canadian plant that reduces production buys fewer American-made parts. A Michigan factory that can’t obtain affordable Canadian components may also have to reduce production.

Previous research illustrates how broadly automotive tariffs can spread through the economy.

In 2018, the Ann Arbor-based Center for Automotive Research modeled a different scenario involving a 25% tariff on all imported vehicles and automotive parts. Its most severe scenario estimated that nearly 715,000 U.S. jobs could be lost.

That number is not a forecast of Trump’s current Canadian tariff proposal, but it demonstrates why economists and auto-industry officials have long warned that tariffs can affect workers far beyond assembly plants.

Investment Could Be Another Michigan Casualty

Browne says uncertainty itself can hurt Michigan.

Automakers and suppliers make investment decisions years in advance. New assembly lines, tooling, automation systems and factories can require investments reaching hundreds of millions or billions of dollars.

Executives deciding where to make those investments need to know what their future costs are likely to be.

If companies don’t know whether moving a component across the Detroit River will carry a 15%, 25% or 50% tariff, they may postpone investment until trade policy becomes clearer.

For Michigan, that could mean delayed factory upgrades, postponed equipment purchases and potentially fewer new jobs.

A 50/50 Trade War

Browne’s greatest concern isn’t simply Trump’s threatened 50% tariff.

It’s what Canada might do in response.

Canada has already demonstrated its willingness to retaliate against U.S. tariffs. Following the latest escalation, Canadian officials announced retaliatory measures against U.S. products. Reuters

Browne’s worst-case scenario is a 50% U.S. automotive tariff followed by a comparable Canadian response.

That would put Michigan and Ontario — two of North America’s most interconnected manufacturing regions — squarely in the middle.

The Trump administration argues that tariffs can encourage companies to manufacture more products in the United States.

Browne sees a different risk: after decades of integration, imposing extremely high tariffs on Canadian vehicles and components could raise costs for the American manufacturers, suppliers and consumers the tariffs are intended to protect.

Whether Trump’s threatened 50% automotive tariff actually takes effect remains uncertain.

But Jan. 1 is now less than three months away.