US Supreme Court Limits President's Tariff Authority

- The ruling specifically invalidates two major tariff programs initiated in 2025: "Trafficking Tariffs" that targeted China, Mexico, and Canada over fentanyl supply chains, and broad "Reciprocal Tariffs" of at least 10% on nearly all trading partners justified by trade deficits. Tariffs imposed under other authorities, such as Section 232 national security tariffs on steel and aluminum or Section 301 tariffs on Chinese goods related to intellectual property, are not affected by this decision. - The Supreme Court's 6-3 decision hinged on the principle that the power to tax and levy duties belongs exclusively to Congress. Chief Justice John Roberts, in the majority opinion, noted that the 1977 International Emergency Economic Powers Act (IEEPA) grants the president power to "regulate" importation but contains no explicit language authorizing the imposition of tariffs. - The Court's majority invoked the "major questions doctrine," arguing that a decision with such vast economic impact—affecting trillions of dollars in trade—requires explicit and clear delegation of authority from Congress, which IEEPA lacks. This marks a significant check on the executive branch's power to use emergency statutes for broad economic policy. - In an immediate response to the ruling, the President announced the imposition of a new 10% global tariff under the authority of Section 122 of the Trade Act of 1974. This law, which has never been used before, allows for a temporary surcharge of up to 15% for a maximum of 150 days to address a balance-of-payments deficit, unless extended by Congress. - The decision is seen as altering the dynamics of international trade negotiations by removing a powerful unilateral tool the White House had used for leverage. This could particularly weaken the U.S. negotiating position in its ongoing tech and trade competition with China, including in strategic sectors like rare earth minerals where China dominates the supply chain. - While the ruling opens the door for companies to receive refunds for the billions of dollars in tariffs paid since 2025, the Supreme Court did not outline a process for this. The authority to determine the mechanics of any reimbursement now falls to lower courts, such as the U.S. Court of International Trade, portending a complex and lengthy process for businesses to reclaim duties. - International reaction included a statement from Brazil's Vice President, who suggested the move to a uniform 10% global tariff under Section 122 could restore competitiveness for countries that had been targeted with higher, country-specific rates. The European Commission stated it was seeking clarity on the U.S.'s next steps while continuing to advocate for lower tariffs.