The trade policy landscape underwent a seismic shift in late February and early March 2026. Here's the essential timeline:
Supreme Court Strikes Down IEEPA Tariffs
In a 6-3 ruling, the Supreme Court ruled that President Trump did not have the authority to levy reciprocal tariffs under the International Emergency Economic Powers Act (IEEPA). The decision invalidated tariffs affecting billions of dollars in imports.
Trump Imposes New Section 122 Tariff
Within hours of the Supreme Court ruling, Trump signed an executive order imposing a new 10% "global tariff" under Section 122 of the Trade Act. These tariffs are temporary and expire within 150 days.
China Tariffs Escalate
Trump announced that tariffs on China would increase by another 10% (from 10% to 20%), taking effect March 4, 2026. The initial 10% China tariffs had taken effect February 4.
Court Orders Tariff Refunds
Judge Eaton of the Court of International Trade ruled that "all importers of record whose entries were subject to IEEPA [tariffs] are entitled to the benefit" of refunds under the Supreme Court decision.
Treasury Announces Section 122 Increase
Treasury Secretary Scott Bessent told CNBC the 10% Section 122 tariff would increase to 15% "likely sometime this week."
New Section 301 Investigations Launched
The Trump administration announced new trade investigations under Section 301 of the Trade Act of 1974, targeting China, Mexico, the European Union, and more than a dozen other economies. Goal: replace the struck-down IEEPA tariffs with legally sound Section 301 tariffs.
Government Warns of Refund Delays
The New York Times reported that the government told a federal court it could take as many as 4,431,161 hours to manually process all refund requests—citing more than 53 million entries for goods subject to illegal duties.
The Supreme Court's ruling means importers who paid tariffs under IEEPA authority are legally entitled to refunds. The total amount: approximately $166 billion.
President Trump has made clear he opposes returning tariff money, which he has heralded as a fiscal boon. His administration has tried to slow the refund process in court, and Trump has suggested the legal wrangling could take years.
Section 301 of the Trade Act of 1974 permits the U.S. to impose tariffs on imported goods from nations found to have engaged in unfair trade practices. Unlike the invalidated IEEPA authority, Section 301 has survived more than 4,000 legal challenges.
Countries Under Investigation:
U.S. Trade Representative Jamieson Greer said the investigations will focus on "structural excess capacity and production in manufacturing sectors" and "unfair trading practices related to excess capacity."
The process involves:
Treasury Secretary Bessent predicted that by August 2026, U.S. tariffs would return to the levels in effect before the Supreme Court's ruling.
Sen. Ron Wyden (D-Ore.), ranking member of the Senate Finance Committee, criticized the new investigations:
"Donald Trump is scrambling to replace his illegal trade taxes with a different tariff scheme to hike prices for Americans. Trump isn't interested in solving real trade problems or stopping China and other trade cheats from undercutting U.S. workers and businesses. He's trying to put his tariffs back in place any way he can."
March 2026 marks a critical inflection point in U.S. trade policy. While the Supreme Court struck down one tariff mechanism, the administration is rapidly implementing alternatives. Importers face:
Stay informed: This is a rapidly evolving situation. Check back for updates as Section 301 investigations progress and refund processes are clarified.
Last updated: March 12, 2026 at 5:00 PM ET
Sources: CNBC, The New York Times, U.S. Trade Representative, Tax Foundation, Tax Policy Center, Court of International Trade filings
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