Supreme Court strikes down Trump’s IEEPA tariffs: What procurement leaders must do next

On Friday, the U.S. Supreme Court ruled that President Donald Trump’s sweeping global tariffs imposed under the International Emergency Economic Powers Act (IEEPA) were unlawful, holding that the statute does not authorize broad tariff powers for the executive branch. The 6–3 decision found that IEEPA, a law originally intended for emergency sanctions, could not be used to levy tariffs—a function the Constitution reserves for Congress.

This is a major legal setback for one of the signature economic tools of the Trump administration’s second term, but it does not necessarily represent an immediate reset of U.S. trade policy. As supply chain leaders, procurement executives and importer teams digest the implications, the question becomes: What next?

What the Supreme Court ruling means

The Court’s decision invalidates the legal basis Trump used for broad tariffs, including “reciprocal” duties on most U.S. trading partners. The ruling may also create avenues for importers to pursue refunds for duties collected under the now-struck tariff regime. But refund processes are complicated, not automatic, and could take years to resolve.

Key points from the ruling:

• The Supreme Court held that IEEPA does not authorize tariffs, reaffirming that only Congress can levy taxes and tariffs.
• The decision could trigger refund claims for duties paid, though implementation is unclear and far from automatic.
• The ruling doesn’t preclude the executive branch from pursuing tariffs under other statutory authorities, such as Section 232 (national security), Section 301 (unfair trade), or safeguard provisions under Section 201, but those routes require additional procedural steps and may face their own legal challenges.

The next phase: Uncertainty, alternatives & economic tension

Even with IEEPA tariffs struck down, supply chains should expect policy reshuffling, ongoing legal activity, and persistent uncertainty.

“Following the Supreme Court ruling against country-based tariffs, the administration may impose additional commodity-based tariffs,” explained Andrei Quinn-Barabanov, Moody’s Supply Chain Industry Practice Lead, in a statement immediately following the ruling. “This could trigger another round of exemption requests and international trade negotiations, potentially prolonging the tariff rate uncertainty and resulting sourcing paralysis well into 2026. Making prudent, long-term sourcing decisions becomes difficult when you can only make solid assumptions about tariffs for some potential vendors, but not for others. This sourcing paralysis may temporarily keep tariff-affected customers and suppliers in an uneasy status quo, leading to 2026 supplier negotiations that are more adversarial and short-term in their outlook.”

In essence, while Supreme Court has provided legal clarity on the issue, it has not provided operational clarity.

How procurement leaders should respond

For procurement and supply chain leaders trying to figure out how to respond, the law firm of Holland & Knight put out a document in December that explained the next steps for firms.

1. Document everything now

Even as new statutes and regulations evolve, detailed documentation of entries, duties paid, HTS classifications, date of entry and payment records remains essential. This preserves refund claims and supports compliance in future tariff structures.

2. Preserve legal standing & deadlines

Importers should consult customs counsel and brokers to:

• File post-summary corrections (PSCs) for unliquidated entries where feasible.
• File administrative protests within statutory deadlines for liquidated entries.
• Consider protective litigation in the U.S. Court of International Trade (CIT) to preserve rights to reliquidation or refunds.

Refunds won’t be automatic and may take time

Even though the Supreme Court found the tariffs unlawful, companies should not expect automatic refunds. Multiple legal avenues exist—PSCs, protests, and CIT litigation—but each requires affirmative action by importers and careful deadline management. CBP generally will not issue a refund unless a protest is timely filed (usually within 180 days) and litigation in the CIT may still be needed to enforce rights, according to law firm Blank Rome. If entry liquidations have already occurred and deadlines have passed, the ability to claim refunds may be lost unless a court directs otherwise.

Operational & contractual knock-on effects

The ruling raises important questions within supply chains:

• Who bears refund rights? Supplier contracts, pricing clauses and indemnification language may govern whether a company or its trading partner retains refund rights or cost obligations.
• What happens to cost-pass-through arrangements? If tariffs were passed through to customers, contracts may need to be revisited to settle who benefits from refunds or price adjustments.
• How do sourcing decisions change? With new statutory uncertainty and potential sourcing paralysis, as Moody’s suggests, many procurement leaders may find themselves reframing supplier negotiations around volatility risk and contractual flexibility.

Tariff tools still available to policy makers

While the Supreme Court struck down tariffs under IEEPA, it did not eliminate tariff tools entirely. Alternatives include:

• Section 232 (Trade Expansion Act) tariffs related to national security concerns.
• Section 301 (Trade Act of 1974) retaliatory tariffs in response to unfair trade.
• Section 201 (Safeguard Measures) temporary tariffs to protect domestic industries from surges.

Each of these legal authorities requires fact-finding, reporting and procedural steps that involve more than executive fiat.

This ruling is not a reset

The Supreme Court’s decision marks a major legal turning point, but its practical effects will take time to materialize. For supply chain leaders, the key is preparation over reaction: meticulous documentation, early engagement with customs counsel, and strategic contract evaluation will dictate whether your organization gains clarity, avoids paralysis, and positions itself advantageously for whatever tariff regime statutory or negotiated comes next.

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