The U.S. Supreme Court ruled on February 20 that tariffs President Donald Trump imposed under the International Emergency Economic Powers Act exceed the statute's authority and unconstitutionally intrude on Congress's taxing power.

In a sweeping rebuke, the court held that IEEPA does not authorize the imposition of tariffs and that the president holds no inherent authority to tax. The Constitution, the ruling stressed, vests that power in the legislative branch. The case, identified in court filings as Vos Selections Inc. v. Trump, anchors a coordinated challenge to Trump's tariff regime.

Within hours of the decision, Trump announced across-the-board tariffs of 10 percent under Section 122 of the Trade Act of 1974. He raised the rate to 15 percent the next day—the statute's statutory ceiling. Those duties lapse automatically after 150 days absent congressional extension.

Does Section 122 actually apply to the U.S. economy?

The statute permits temporary tariffs when the United States has "large and serious balance-of-payments deficits." That condition is not met, according to the Peterson Institute for International Economics. A balance-of-payments deficit arises when private financial inflows cannot finance a country's current account deficit. Under a floating exchange rate—a regime the United States has maintained for more than 50 years—currency depreciation addresses any financing shortfall before a balance-of-payments deficit materializes.

The administration's own lawyers made the point in the IEEPA litigation. Section 122 was no substitute for IEEPA, they argued, because balance-of-payments deficits differ conceptually from the trade and current account deficits Trump has labeled emergencies.

Can Trump invoke the dollar-depreciation trigger?

Section 122 also permits tariffs "to prevent an imminent and significant depreciation of the dollar in foreign exchange markets." The dollar has fallen roughly 9 percent in effective terms since Trump took office. PIIE attributes the move to Trump's tariff policies and his public pressure on the Federal Reserve to cut rates—not to any structural weakness in U.S. external financing.

What does the ruling change for businesses and importers?

In the short term, perhaps not much. Tariff rates will remain near pre-ruling levels, and consumers continue to shoulder the levy. Input costs for manufacturers and retailers will persist, and policy uncertainty will continue to complicate procurement and pricing. The distribution of protection, however, will shift. The Section 122 regime is nondiscriminatory and applies uniform rates, undercutting the bilateral deal-making the administration pursued under IEEPA. Countries that previously secured lower rates—including the United Kingdom, which has already vowed to seek renewed carve-outs—may press for equal treatment.

Will Congress extend the duties?

Unlikely. Both chambers have passed resolutions disapproving the IEEPA tariffs. The administration's 150-day window effectively forces a showdown: Congress must vote on extension or watch the duties lapse.

What other authorities remain on the table?

Even before the Section 122 duties expire, the administration can pursue tariffs grounded in national security or findings of unfair trade practices. Those routes require investigations and fact-finding, some of which are already underway. Expect the administration to use the 150-day window to lay procedural groundwork for successor duties. Outside the tariff toolbox, the president retains authority to impose economic sanctions and other measures.

Peterson Institute analysts framed the holding's significance this way: "The power to tax lies with the legislative branch. The president's powers are, in the end, limited." Practitioners should expect a fresh wave of litigation testing each alternative authority as the administration deploys it.