Courts Gutted US Tariff Authority. Markets Barely Blinked.

Two federal courts have now struck down the legal pillars of the Trump administration’s sweeping tariff programme within three months of each other. The Supreme Court invalidated tariffs imposed under the International Emergency Economic Powers Act (IEEPA) on 20 February 2026. The Court of International Trade (CIT) followed on 8 May 2026, striking down Section 122-based duties. Together, these rulings dismantle the two broadest statutory authorities the executive branch had used to impose US tariff policy unilaterally, yet the S&P 500 closed above 7,398 on the day of the second ruling, and the VIX barely moved.

The gap between the legal significance and the market’s response is the story worth unpacking. What follows is an analysis of the legal double-blow to executive tariff authority, why equity markets responded with restraint rather than a relief rally, and what the rulings mean for investors watching trade risk in the months ahead.

The legal architecture just collapsed in two places at once

The two rulings did not chip away at tariff authority. They removed its load-bearing walls.

• Learning Resources v. Trump (Supreme Court, 20 February 2026): Struck down IEEPA-based tariffs, holding that IEEPA’s “regulate” language does not extend to tariff imposition. The Court invoked the major questions doctrine, ruling that such a significant exercise of power required explicit congressional authorisation.
• V.O.S. Selections v. Trump (CIT, 8 May 2026): Invalidated Section 122 balance-of-payments tariff authority, removing a second statutory pillar the administration had relied upon for broad-based duties.

Legal analysis from Skadden Arps, published 26 February 2026, characterised the IEEPA ruling as a foundational shift:

“The Supreme Court’s application of the major questions doctrine to IEEPA amounts to a constitutional reset of executive trade authority.”

K&L Gates warned in a 9 May 2026 assessment that Section 301, the remaining statutory tool the administration has used for targeted tariffs, now faces heightened litigation risk given the pattern of judicial pushback. WilmerHale trade analyst Simon Lester described the combined rulings as a “one-two punch” that leaves the executive with significantly narrowed unilateral options.

Section 301 tariff exposure has already produced concrete winners and losers at the sectoral level, with domestic battery materials producers such as Novonix absorbing demand previously captured by Chinese suppliers now facing combined duties exceeding 160%, a preview of the kind of industrial reshaping that accelerates when tariff authority shifts from executive orders to legislatively-grounded, longer-cycle instruments.

Lawfare’s major questions doctrine analysis of the Learning Resources ruling argues that the Court’s logic extends beyond IEEPA, placing Section 232 and other statutes conferring broad executive trade discretion on uncertain constitutional footing if challenged in litigation.

Why markets shrugged when the news was genuinely significant

The muted reaction was not indifference. It was prior pricing.

Through 2025, the S&P 500 experienced a 5-7% drawdown at peak tariff escalation, functioning as the market’s real-time absorption of trade policy risk. By the time the CIT ruled on 8 May, the volatility premium had already been extracted.

The divergence between the Nasdaq’s 1.71% gain and the Dow’s near-flat close is telling. Technology-heavy names, which carry less direct tariff exposure on physical goods, rallied. Industrial and manufacturing-heavy Dow components, still processing supply chain restructuring costs, did not.

Goldman Sachs, in a 9 May note, characterised the rulings as ending the “tariff bluff era,” arguing that the policy uncertainty premium embedded in valuations had been the larger drag, and its removal was already underway before the gavel fell.

Goldman Sachs described the rulings as ending the “tariff bluff era,” reducing the policy uncertainty premium that had weighed on equity valuations throughout 2025.

Investors who interpret the restrained move as complacency may be misreading the signal. The market had already done this work.

The resilience of global recession buffers matters directly to how investors should read the muted equity response: BCA Research’s seven-factor framework identifies IT investment at a record 4.9% of GDP in Q1 2026 as the most durable cushion, suggesting that the tariff uncertainty premium was being absorbed against a backdrop of genuine structural strength rather than complacency.

What executive tariff authority actually looks like after these rulings

With IEEPA and Section 122 off the table, three pathways remain for the administration to pursue tariff policy:

• Section 232 (national security authority): The most legally defensible remaining tool for unilateral executive action. Allows tariffs on goods deemed to threaten national security, though its scope is narrower than the invalidated authorities.
• Trading with the Enemy Act (TWEA): Has been floated as an alternative, though its applicability to peacetime trade disputes is untested and would almost certainly face immediate legal challenge.
• Congressional legislative grant: New legislation explicitly authorising tariff imposition, which the White House is actively pursuing.

USTR Jamieson Greer signalled in a 9 May interview that the administration is exploring “national security relabeling” of existing duties to bring them under Section 232 authority, a workaround that legal experts expect to face its own litigation.

The White House responded to the CIT ruling directly: “Courts can’t stop America First, Congress will act.”

The congressional pathway and its timeline constraints

That statement reflects a genuine shift in mechanism. Any legislative grant of tariff authority requires passage through both chambers of Congress, introducing a longer and less predictable timeline than executive orders.

The White House has reportedly pushed for explicit statutory authority, with some reporting referencing a “Trade Security Act,” though no confirmed bill text or hearing schedule has been verified as of 9 May 2026. Congressional dynamics introduce partisan negotiation variables entirely absent from the executive order model investors had been pricing around.

How US trading partners are already repositioning around the uncertainty

While the legal drama plays out domestically, the more durable market story is the structural trade rerouting that has accelerated regardless of courtroom outcomes.

The pattern across all four partners is consistent: immediate relief combined with continued diversification. Supply chain rerouting that began as a tactical response to tariff volatility has become structural. A reversal of US tariff policy may not restore prior trade patterns, even if executive authority is eventually restored through legislation.

Global trade is growing without US leadership, and the data shows it

The volume figures tell the story more precisely than any single ruling can.

Global non-US trade share rising from 72% to 75% in a single year is not a cyclical fluctuation. Global container volumes on ex-US routes climbed approximately 8% year-over-year, reinforcing the pattern. Commerce has not contracted; it has rerouted.

These figures are drawn from WTO, Eurostat, China Customs, and UNCTAD directional reporting, though exact report editions have not been independently verified. The directional trend is consistent across sources.

What trade rerouting means for US-focused equity exposure

For investors with concentrated US equity exposure, the data suggests a policy-driven reduction in US trade activity does not translate directly into a global trade contraction. Sectors with high import exposure, particularly electronics and automobiles, face continued price adjustment risk regardless of court outcomes, given supply chain restructuring timelines of 12-18 months. Tariff removals could lower consumer prices by 1-2% in those categories, while the 15% nearshoring-driven increase in auto sector imports from Mexico indicates the structural shift is already well advanced.

Structural supply chain repricing is not unique to trade policy: the Hormuz oil risk premium demonstrates the same pattern of rerouting becoming permanent even when the original disruption resolves, with VLCC daily hire rates near $110,000 and a projected two-year recovery timeline that mirrors the 12-18 month restructuring lag the current article identifies for tariff-exposed manufacturing sectors.

The tariff era is not over, it is just moving to a slower lane

The rulings do not end tariff risk. They change its speed and its mechanism.

The Brookings Institution, in a 9 May 2026 assessment, framed the shift directly:

“The rulings transfer tariff authority from the executive to Congress, slowing the pace of ‘overnight’ tariff imposition without ending tariffs as a policy tool entirely.”

Three pathways remain, ranked by legal defensibility and speed of execution:

1. Section 232 relabeling: Fastest remaining executive option, though scope is narrower and litigation is expected.
2. Congressional legislative grant: More durable if passed, but dependent on bipartisan negotiation and an uncertain timeline.
3. TWEA invocation: Legally untested in this context, with the highest litigation risk of any remaining pathway.

JPMorgan’s 8 May prediction of a flatter yield curve as trade risks fade aligns with the 10-year Treasury yield reading near 4.39-4.42%, well below the historical average of approximately 5.8%. The bond market, like equities, is pricing a world where tariff shocks arrive more slowly.

The appropriate investor response is calibration, not capitulation. Tariff risk has migrated from a binary executive shock model to an extended legislative uncertainty model, which is, by its nature, more priceable by markets and more manageable within diversified portfolios.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Forward-looking statements regarding trade policy outcomes are speculative and subject to change based on legislative, judicial, and executive developments.