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Supreme Court Strikes Down IEEPA Tariffs

Michael Brown
Michael Brown
Senior Research Strategist
20 Feb 2026
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The Supreme Court have, today, largely as expected, struck down the President’s authority to impose tariffs using the International Emergency Economic Powers Act (IEEPA).

This, to be clear, accounts for roughly half of the rise in the overall average effective tariff rate seen since President Trump returned to office, and chiefly concerns those levies that were imposed on a ‘reciprocal’ basis, as well as those levied on China, Canada, and Mexico regarding ‘fentanyl supply’.

Though the IEEPA tariffs have been struck down, there are at least five other sections of US commerce law which the Admin can lean upon in order to re-implement similar measures. While these measures, by and large, require either Congressional approval, an investigation by the Commerce Department, or are in some way time-limited, there are likely enough alternative methods that the Admin can employ to ensure that the overall average tariff rate remains little changed, at around 16%, once the dust settles. We, of course, await clarity from the Admin as to their exact plans on this front.

As for the issue of refunds, there is not yet clarity on this front either, however the ruling does – at face value – seem to indicate that these are now a distinct possibility.

While we await further information here, it is worth bearing in mind that any refunds are likely to be paid back over some time, and in large part will be funded by an increase in issuance of short-term Treasury bills, the impact of which would likely then be netted-off against any revenue from the aforementioned alternative tariff measures that may be on their way.

Overall, while today’s ruling does potentially, to some degree, nullify the ‘escalate to de-escalate’ negotiating strategy with which we’ve become familiar, it seems highly unlikely that the Admin, or Trump himself, will change their entire ‘modus operandi’ when it comes to negotiations, and using tariff threats as a means of leverage, in order to extract concessions from the other party. Put simply, for markets, and in the grand scheme of proceedings, little is likely to change on the trade front – while the legal ‘means’ of imposing tariffs will now differ, the ‘ends’ will ultimately be very similar to the current status quo.

The material provided here has not been prepared in accordance with legal requirements designed to promote the independence of investment research and as such is considered to be a marketing communication. Whilst it is not subject to any prohibition on dealing ahead of the dissemination of investment research we will not seek to take any advantage before providing it to our clients.

Pepperstone doesn’t represent that the material provided here is accurate, current or complete, and therefore shouldn’t be relied upon as such. The information, whether from a third party or not, isn’t to be considered as a recommendation; or an offer to buy or sell; or the solicitation of an offer to buy or sell any security, financial product or instrument; or to participate in any particular trading strategy. It does not take into account readers’ financial situation or investment objectives. We advise any readers of this content to seek their own advice. Without the approval of Pepperstone, reproduction or redistribution of this information isn’t permitted.

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