Supreme Court Reviews Legality of Trump-Era Tariffs as Markets Hold Breath

During a pivotal session on Wednesday, the U.S. Supreme Court probed the authority used to impose broad global tariffs under the Trump administration, raising questions about the future shape of U.S. trade policy. Justices examined whether the 1977 International Emergency Economic Powers Act (IEEPA) — which permits import controls during declared emergencies but does not expressly grant tariff powers — can lawfully underpin such duties.

Only Justices Samuel Alito and Clarence Thomas signalled support for the government's stance; the remaining justices voiced doubts about the administration’s contention that the president possesses open-ended tariff authority. Legal analysts say the questioning increases the chances of a decision that could overturn the tariffs, which have generated more than $100 billion in collections from importers.

Experts caution that a setback for the IEEPA route may prompt rapid shifts to other statutory options, including Section 232 of the Trade Expansion Act on national security grounds or Section 122 of the Trade Act, which allows temporary import duties. Firms continue to face planning difficulties amid this legal uncertainty.

Determining refunds for duties already paid could prove complex. A small subset of businesses might receive returns automatically, but most importers would need to file administrative protests — a process that customs attorneys say could take many months. Even with clear court direction, resolving claims could extend close to a year.

The court’s judgment, anticipated in early 2026, adds uncertainty to global commerce, coming after a recent easing of tensions with China and agreements with Southeast Asian partners that have relaxed some trade frictions. Economists warn prolonged ambiguity may sway investment choices and affect sectors reliant on international trade.

As the litigation moves forward, companies and policymakers are preparing for continued volatility; the Supreme Court’s eventual ruling may redefine the scope of presidential power in shaping U.S. international trade policy.