IEEPA Tariff Decision: Jefferies warns that outcomes can defy predictions

Investing.com -- Jefferies told investors not to become complacent ahead of the Supreme Court’s ruling on the IEEPA tariffs, warning in a note on Wednesday that even though markets widely expect invalidation, outcomes “can defy predictions.”

Analyst Aniket Shah writes that Jefferies “share the consensus view that the Supreme Court will invalidate the IEEPA tariffs,” but stresses that “oral-argument signals are imperfect.”

Shah notes that the tone of the Nov. 5 hearing shifted sentiment markedly. According to Jefferies, “at least five justices… voiced deep skepticism of the government’s broad interpretation of IEEPA,” with several emphasising that tariff-setting is “fundamentally Congress’s domain.”

The reaction pushed expectations toward a “strong expectation that the tariffs would be invalidated.”

However, Jefferies highlights meaningful tail risk. The firm cites NFIB v. Sebelius, a Supreme Court case about the Affordable Care Act, as a reminder that “Supreme Court outcomes can defy predictions.”

Shah points out that despite near-unanimous expectations the individual mandate would fall, the Court upheld it 5-4, showing that “justices’ views can evolve,” and that “aggressive questioning… does not always signal a justice’s final position.”

Because markets have broadly priced in tariff relief, Jefferies warns that a surprise ruling upholding the duties would likely “jolt markets.”

The firm says tariff-sensitive stocks could sell off, and volatility could spike, suggesting investors consider hedging ahead of the decision. A delay would push any ruling to late February.

Jefferies also believes that sector exposures matter, with companies expecting tariff rollback potentially facing downside, while domestically protected manufacturers may retain an advantage.

Essential goods categories are “likely to continue seeing exemptions.” If tariffs are upheld, Jefferies adds, it would “green-light continued use of tariffs as policy leverage,” keeping trade-related headline risk elevated through 2026.

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