The Court That Killed the Tariffs: What the Supreme Court's IEEPA Ruling Actually Means

The Ruling

On February 20, 2026, the Supreme Court of the United States issued its opinion in Learning Resources, Inc. v. Trump, ruling 6-3 that President Trump's sweeping tariffs — imposed under the International Emergency Economic Powers Act of 1977 (IEEPA) — exceeded the authority Congress granted him under that law. Chief Justice John Roberts wrote the majority opinion, according to SCOTUSblog's contemporaneous coverage.

"Based on two words separated by 16 others in … IEEPA — 'regulate' and 'importation' — the President asserts the independent power to impose tariffs on imports from any country, of any product, at any rate, for any amount of time," Roberts wrote, according to SCOTUSblog. "Those words cannot bear such weight." He added: "IEEPA contains no reference to tariffs or duties. Moreover, until now no President has read IEEPA to confer such power."

The six-justice majority included Roberts, along with Justices Neil Gorsuch and Amy Coney Barrett joining in full, and three additional justices joining in part, according to WilmerHale's legal analysis published February 21, 2026. The three dissenters were Justices Brett Kavanaugh, Clarence Thomas, and Samuel Alito, according to SCOTUSblog.

The ruling invalidated two categories of IEEPA tariffs: the "trafficking tariffs" — targeting products from China, Canada, and Mexico, which Trump had justified on fentanyl grounds — and the "reciprocal tariffs," which imposed a baseline 10% levy on imports from nearly all countries and higher rates on dozens of trading partners, according to SCOTUSblog.

The Scale of What Was at Stake

The financial stakes were enormous. The Tax Foundation estimated that the IEEPA tariffs had raised more than $160 billion for the federal government through February 20, 2026, the date of the ruling. Looking forward, the Foundation estimated the tariffs would have raised $1.4 trillion from 2026 through 2035 had they remained in place, according to Tax Foundation's analysis published February 20, 2026.

The refund question immediately became one of the most consequential open issues. CNBC had estimated that importers paid more than $200 billion in IEEPA tariffs through December 2025, a figure cited in the dissenting opinion by Justice Kavanaugh, according to SCOTUSblog. Kavanaugh wrote in dissent that "the United States may be required to refund billions of dollars to importers who paid the IEEPA tariffs, even though some importers may have already passed on costs to consumers or others."

The majority opinion, however, did not address refunds at all, according to SCOTUSblog's follow-up coverage. That omission immediately created a secondary legal battle.

The Refund Chaos

Two weeks after the Supreme Court ruling, on March 4, 2026, U.S. Court of International Trade Judge Richard Eaton issued a sweeping order directing Customs and Border Protection (CBP) to begin paying refunds to all importers of record who had paid IEEPA-based duties, according to Morgan Lewis's legal analysis published in March 2026. The order applied to all importers — both those who had filed lawsuits and those who had not, according to Foley & Lardner's analysis of the CIT ruling.

"To find otherwise," Judge Eaton wrote, would "deny [filing importers] the efficient resolution of their claims, and [non-filing importers] the benefit of the Learning Resources decision," according to Foley & Lardner's documentation. Eaton also ruled that his court alone would have jurisdiction over future refund cases, according to IECI's reporting on the order.

CBP subsequently described a new system — the ACE Capability for Processing Entries (CAPE) — intended to process refund requests. CBP estimated approximately 45 days to stand up the CAPE system, but did not provide a timeline for how long processing refund payments would actually take once the system was operational, according to Forvis Mazars's update published in March 2026. CBP's process addresses "unliquidated and liquidated entries that have not become final" but does not automatically address entries that are already liquidated and final — meaning some importers may need to file administrative protests within a 180-day window, according to the same Forvis Mazars analysis.

The practical complexity is significant: a refund process covering potentially over $160 billion in collected duties, distributed across thousands of import transactions involving millions of product entries, has no straightforward administrative mechanism. Legal and trade compliance firms across the country began advising clients in late February and March 2026 that refund eligibility, timing, and process remain contested.

What the Ruling Did NOT Strike Down

A critical point that was widely misunderstood in early coverage: the Supreme Court's ruling applied only to IEEPA tariffs. It left intact a significant range of other tariff authorities, according to Thomson Reuters Institute's analysis published February 20, 2026:

• Section 232 tariffs — imposed on national security grounds, covering steel, aluminum, autos, and other goods — remain fully in place.
• Section 301 tariffs — imposed on Chinese imports following Trade Representative investigations — remain fully in place.
• De minimis termination — the end of duty-free treatment for small-value imports — remains in place.

Trump himself issued a statement immediately following the ruling, stating: "All National Security TARIFFS, Section 232 and existing Section 301 TARIFFS, remain in place, and in full force and effect," according to the New York Times's live coverage of February 20, 2026.

Peter Navarro, a senior Trump trade adviser, described the ruling as "the best possible outcome" for the administration in comments to The Hill published March 25, 2026, arguing that the justices had "ratified and affirmed" the use of other tariff authorities while only restricting IEEPA specifically.

Trump's Same-Day Workaround

Within hours of the ruling, the Trump administration moved to replace the invalidated IEEPA tariffs with a different legal mechanism. On February 20, 2026 — the same day as the ruling — Trump issued a Proclamation under Section 122 of the Trade Act of 1974, imposing a 10% "temporary import surcharge" on products from all countries, effective February 24, 2026, for a period of 150 days (until approximately July 24, 2026), unless modified, terminated, or extended by Congress, according to WilmerHale's legal alert.

Section 122 grants the president authority to impose temporary tariff surcharges of up to 15% for up to 150 days to address significant balance-of-payments deficits — a narrower and more time-limited authority than IEEPA, but one that the Supreme Court did not address in its ruling. The Council on Foreign Relations noted that the administration's rapid pivot demonstrated that the tariff policy infrastructure, while legally constrained by the ruling, was not practically dismantled, according to CFR's analysis published February 23, 2026.

The Peterson Institute for International Economics (PIIE), in an analysis published February 23, 2026, noted that while the ruling was "a clear rebuke to President Donald Trump's tariff policies," the administration retained significant tariff-imposing capability through remaining authorities. PIIE assessed that the ruling "changes a lot and changes nothing" simultaneously — the legal framework was redrawn, but the practical trade policy trajectory remained largely intact through alternative mechanisms.

Historical Context: The "Major Questions" Doctrine

The legal theory underpinning the Roberts majority — in part — was the "major questions" doctrine, a principle the Supreme Court has applied in several recent cases to limit executive agency authority in areas of major economic and political significance absent clear congressional authorization. The doctrine holds that when an executive action has sweeping economic or societal implications, Congress must have specifically authorized it, not merely permitted it through broad statutory language.

Roberts, Gorsuch, and Barrett applied the major questions doctrine as one prong of the analysis, finding that a president claiming the authority to impose tariffs of any rate, on any product, from any country, for any duration based on two words in a 1977 emergency statute represented exactly the kind of major question that required explicit congressional delegation, according to SCOTUSblog's analysis.

IEEPA has been law since 1977, and has been used by presidents of both parties to impose sanctions, freeze assets, and restrict financial transactions during national emergencies. No president before Trump had used it to impose broad tariffs, a fact the Court cited as evidence against the administration's reading. The law gives the president authority to "regulate … importation or exportation" — and the majority ruled that "regulate" does not encompass the power to tax, in part because interpreting it that way would create a constitutional problem: the Constitution specifically bars taxes on exports, so "regulate" cannot mean "tax" for exports and something else for imports, according to SCOTUSblog's coverage of the Roberts opinion.

Why It Matters Beyond Trade Policy

The ruling is significant beyond the specific question of tariffs. It represents the first time the Supreme Court has struck down a major executive economic action under IEEPA — a law whose breadth has long been questioned by legal scholars. The court's 6-3 breakdown, with two of Trump's own appointees (Gorsuch and Barrett) joining the majority, signals that even a court viewed as politically favorable to the administration has limits on executive power expansion.

The refund question — potentially over $160 billion in duties collected — remains unresolved in any practical sense as of late March 2026. The administrative machinery to process refunds is still being built. The legal questions of who is entitled to refund (and from what fund), and whether companies that passed the tariff costs to consumers have any refund obligation, are being litigated in parallel.

Meanwhile, the 10% Section 122 surcharge, set to expire in approximately July 2026, creates a congressional clock: Congress could extend it, expand it, or let it lapse. What replaces the IEEPA tariff regime — if anything — will be one of the defining trade policy questions of the remainder of 2026.