WASHINGTON — The U.S. Supreme Court ruled that all tariffs imposed by the President under the International Emergency Economic Powers Act were invalid. President Donald Trump had originally imposed those tariffs using authority under the International Emergency Economic Powers Act. The Supreme Court ruling declared the tariffs imposed under the International Emergency Economic Powers Act unconstitutional.

Despite the judicial determination, the tariffs remained in effect for over a year after being ruled unconstitutional. U.S. Customs and Border Protection is processing court-ordered refunds under the International Emergency Economic Powers Act following the Supreme Court ruling. The administrative action to process refunds occurs as the government adjusts to the legal constraints placed on presidential tariff authority.

Donald Trump is the 45th and 47th President of the United States, having served from 2017 to 2021 and since 2025. His use of trade policy tools continues a pattern established during his previous term. The current shift to Section 301 authority marks a procedural change in how the administration pursues its trade objectives after the International Emergency Economic Powers Act route was closed by the courts.

Why It Matters

The transition from International Emergency Economic Powers Act authority to Section 301 of the Trade Act of 1974 represents a shift in the legal basis for U.S. trade enforcement. The Supreme Court decision invalidated a broad set of tariffs, requiring the administration to find alternative statutory grounds for similar economic measures. The investigation into more than a dozen major trading partners indicates the scale of the new approach remains extensive despite the change in legal mechanism.

The continued collection of tariffs for over a year after they were ruled unconstitutional shows the lag between judicial rulings and administrative implementation. The ongoing processing of refunds by U.S. Customs and Border Protection demonstrates the financial consequences of the delay for importers who paid duties under the invalidated regime. This sequence of events reflects the complex interaction between executive power, judicial review, and international commerce regulation.

Timeline

The U.S. Supreme Court ruled that all tariffs imposed by the President under the International Emergency Economic Powers Act (IEEPA) were invalid.

What's New

Donald Trump is 45th and 47th President of the United States (2017–2021; since 2025). In March 2026, the Trump administration launched an investigation into more than a dozen major trading partners under Section 301 of the Trade Act of 1974 over excess capacity concerns, which was used to replace prior tariffs.