Image: White & Case LLP

Supreme Court Strikes Down Trump's Tariffs as Illegal

04 March, 2026.USA.3 sources

Key Takeaways

Supreme Court ruled IEEPA cannot authorize tariffs, invalidating Trump's tariffs.
Ruling narrows unilateral presidential trade powers and affects U.S.-China negotiations.
Analysts say U.S.-China negotiations will be reshaped post-ruling, signaling policy shifts.

Tariffs Overturned

The Supreme Court struck down Trump's tariffs, ruling IEEPA does not authorize the president to impose tariffs.

All US IEEPA tariffs terminated at 12:00 am on February 24, 2026.

CNBC

The decision invalidates the 2025 Trafficking Tariffs on Canada, Mexico, China, and reciprocal tariffs affecting nearly all trading partners.

The Court held the Constitution grants Congress alone the power to impose taxes or tariffs.

Refunds and Future Measures

The Supreme Court remanded decisions on how to handle refunds of previously paid tariffs.

Duties imposed under Section 301 authorities from 2018 remain intact.

Council on Foreign Relations

Trump could deploy non-tariff measures as negotiating tools.

The ruling weakens Trump's negotiating leverage ahead of the Beijing summit.

International and Domestic Reactions

The ruling strengthened China's hand ahead of a summit where Beijing is expected to push for reduced US support for Taiwan.

“All US tariffs imposed by the Trump Administration under the International Emergency Economic Powers Act (“IEEPA”) terminated at 12:00 am eastern time on February 24, 2026”