Supreme Court Strikes Down Trump Tariffs, Leaves Auto Industry Duties Intact

Published: February 23rd, 2026

The U.S. Supreme Court ruled 6-3 Thursday that President Donald Trump’s sweeping tariff regime is unconstitutional, striking down duties that generated $133 billion in revenue last year. But the decision leaves billions of dollars in auto-related tariffs untouched—and offers no guidance on whether the government must refund the duties businesses have already paid.

The ruling eliminates tariffs imposed under the International Emergency Economic Powers Act, a 1977 law the court said doesn’t give presidents authority to impose trade duties. Yet tariffs on vehicles, auto parts, steel, aluminum and copper remain in effect because they were implemented under different legal authority, creating a split outcome that offers the auto industry only partial relief.

What survives the ruling

Chief Justice John Roberts wrote that IEEPA “does not authorize the President to impose tariffs,” emphasizing that Congress alone holds constitutional power over trade duties and wouldn’t surrender that authority through vague statutory language.

The decision wipes out a 10% tariff that had applied to nearly every country, plus higher duties on major trading partners. But Section 232 tariffs—justified on national security grounds—survive because they weren’t challenged in this case. Those duties currently apply to steel, aluminum, copper, automobiles and auto parts.

Two Trump appointees, Amy Coney Barrett and Neil Gorsuch, joined Roberts and the court’s three liberal justices in the majority. Justice Brett Kavanaugh dissented, warning the refund process would be a “mess.”

The $133 billion question

The court’s majority opinion made no mention of refunds, leaving businesses uncertain whether they’ll recover the billions they’ve paid under now-illegal tariffs. Between March and October 2025 alone, presidential tariffs generated $175 billion in revenue, according to business coalition We Pay the Tariffs.

IEEPA tariffs represented 60% of total U.S. tariff revenue in 2025. The auto industry has already paid billions in duties and filed lawsuits to protect refund claims, but the Supreme Court offered no timeline or process for recovery.

“The United States may be required to refund billions of dollars to importers who paid the IEEPA tariffs, even though some importers may have already passed on costs to consumers or others,” Kavanaugh wrote in his dissent.

Businesses that paid IEEPA tariffs should monitor litigation and administrative developments. Companies with strong documentation of tariff payments need to ensure their refund claims are properly filed, though the path forward remains unclear.

What this means for automakers

The ruling creates a complicated landscape for auto manufacturers and suppliers. Section 232 tariffs on steel and aluminum—critical inputs for vehicle production—remain in effect. So do duties on automobiles themselves and their parts.

The elimination of reciprocal and fentanyl-related IEEPA tariffs may reduce some supply chain pressures, but won’t address the core cost increases from metal tariffs. Companies can’t expect immediate relief on their biggest input costs.

The decision does open opportunities to diversify sourcing. With tariffs eliminated on many countries previously targeted under reciprocal schemes, automakers can potentially shift supply chains away from countries still subject to Section 232 duties. But that recalibration takes time and money.

Dan Kelly of the Canadian Federation of Independent Business called the ruling “good news” for upcoming trade negotiations but noted it “will not help address the uncertainty related to Canada/U.S. trade, nor the crippling tariffs on steel and aluminum that have been imposed by both countries.”

Trade deals in limbo

The ruling raises questions about trade agreements Trump negotiated with the European Union, Japan, South Korea and other partners to reduce targeted tariffs. Those deals were premised on IEEPA authority the court now says Trump never had.

Kavanaugh noted that IEEPA tariffs helped facilitate trade deals worth trillions of dollars, and the court’s decision could generate uncertainty regarding those agreements. Automakers operating international supply chains face a secondary layer of complexity as the status of these deals remains unclear.

Other tariff tools remain available

The president still has statutory authority to impose tariffs through other mechanisms, though each comes with constraints. Section 232 allows tariffs on national security grounds after formal investigations lasting several months. Section 301 targets nations engaging in anticompetitive trade practices and currently applies only to China.

Section 122 and Section 338 allow tariffs up to 50% against countries discriminating against U.S. commerce. These can be imposed relatively quickly without formal investigation, but have never been used and would likely face legal challenges.

The ruling reinforces that Congress must explicitly authorize tariff powers rather than rely on ambiguous statutory language. Any future tariff authority granted to the president will need clear limits.

TD Economics characterized the decision as “not entirely unexpected” given justices’ skepticism during November oral arguments. The firm noted that “2026 is likely to start off in a similar fashion to 2025, with elevated tariff uncertainty that subsides with time but weighs on the economy and pushes interest rates higher over the near-term thanks to higher inflation pressures.”

The decision reduces near-term uncertainty compared to the previous regime’s constant threat of new tariffs, but doesn’t eliminate it entirely. Interest rates and inflation expectations may stabilize as the most aggressive tariff expansion is curtailed, though elevated uncertainty will persist until refund procedures are clarified.

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