Supreme Court delts a blow to presidential authority

Key takeaways 

• The Supreme Court ruled today that the administration’s sweeping tariff measures were unlawful, marking a significant setback for the policy framework.
• Across assets, this shift in the fiscal backdrop was reflected in a modestly softer dollar and slightly higher yields along the 10‑ and 30‑year maturities as investors priced a marginally wider deficit path.
• Equities traded firmer, with risk assets responding to expectations of reduced trade friction - a dynamic seen as supportive for operating margins and global growth sentiment.

What happened? 

The Supreme Court issued a 6 – 3 ruling striking down the President’s attempt to use the International Emergency Economic Powers Act (IEEPA) as authority to impose tariffs. The Court held that IEEPA does not grant the President the power to levy tariffs, reaffirming that the Constitution assigns tariff‑setting and other taxing powers to Congress under Article I. Chief Justice Roberts, writing for the majority, emphasized that while IEEPA allows the President to regulate or restrict importation during national emergencies, the statute’s detailed list of powers does not include imposing duties. The Court noted that when Congress has delegated tariff authority in the past, it has done so explicitly and with clear limits – none of which appear in IEEPA. The opinion also highlighted that no President has used IEEPA to impose tariffs in the law’s 50‑year history, underscoring that the government’s interpretation would significantly expand executive authority. Estimates show that roughly $130 billion in IEEPA‑based tariffs collected since 2025 may now be subject to refund claims, depending on how lower courts and Customs handle challenges.

Some in the majority concluded that the statutory text alone resolved the case, while others pointed to the broader principle that Congress does not delegate major economic powers through ambiguous language. The ruling further clarified how emergency‑powers statutes interact with congressional authority. While IEEPA grants flexibility in responding to foreign threats, the Court stressed that emergency contexts do not override constitutional limits on revenue‑raising powers. The opinion reinforced that the President may restrict or regulate trade under IEEPA but cannot convert those authorities into tariff‑setting power without explicit congressional direction.

What does it mean for investors?

The Supreme Court’s tariff ruling narrowed the scope for rapid, large‑scale actions, setting clearer boundaries while still leaving markets to sort through several operational questions. The administration’s response has remained measured, with officials pointing to alternative statutory tools that could partially offset any lost revenue capacity. At the same time, the broader fiscal backdrop is becoming more sensitive to assumptions about tariff effectiveness, and policymakers are increasingly aware that any sustained slippage in effective rates could complicate deficit projections and put incremental pressure on the long end of the curve. Refund claims also remain unresolved, forcing smaller import‑reliant firms into a prolonged wait while lower courts determine viability and timing. Any meaningful repayments would carry fiscal implications and could shape expectations for issuance, though steady demand and reserve‑management purchases have kept absorption concerns contained.

Markets interpreted the ruling as a modest positive for the global trade backdrop. The dollar edged lower, long‑end yields rose slightly on expectations of a softer fiscal position, and equities advanced on prospects of reduced supply‑chain friction. Apparel and other goods exposed sectors outperformed, reflecting uneven industry level sensitivity to tariff shifts.

The inflation outlook has become more nuanced as the rollback or uncertainty surrounding IEEPA‑imposed duties introduces mild downward pressure on the one‑year CPI path, though most price effects are already reflected. Refunds could briefly lift demand and near‑term inflation even as the Fed stays data‑dependent. Markets now see a slightly higher chance of a June hold, with a July cut still likely. As trade policy shifts toward a more structured framework, investors will watch replacement tariffs, fiscal trends, and inflation data. Given the evolving backdrop and contained inflation risks, our base case anticipates two further rate cuts by end‑2026.

Uncertainty around trade and tariff policy is likely to persist in the coming months as the Trump administration works to reconcile the SCOTUS ruling with its broader aim of generating tariff revenues. Importantly, this ruling does not alter the macro backdrop and is not expected to affect aggregate index‑level corporate profitability. Given this initial assessment, we continue to encourage investors to remain aligned with their planned asset‑allocation frameworks.