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U.S. Supreme Court Strikes Down IEEPA Tariffs, Doesn’t Offer Refund Mechanism

The U.S. Supreme Court ruled 6‑3 that the president lacks authority under the International Emergency Economic Powers Act to impose tariffs, striking down the 25% duties on Mexico and Canada and the 10‑20% duties on China. The decision left refund claims to lower courts, providing no immediate relief for businesses that paid the illegal tariffs. In response, the Trump administration introduced a temporary 10‑15% global surcharge under Section 122, set to run for 150 days, and pledged new Section 301 investigations to replace the voided measures. Existing tariffs based on Section 232 and earlier Section 301 actions remain in force.