President Trump’s most sweeping tariffs face a landmark test of presidential powers, as the US Supreme Court is set to rule on the implications and legality of Trump’s global duties on trade partners.

The high court’s first opportunity to issue a verdict came Friday. But after a flurry of speculation in the past few days, the justices did not release their opinion in the tariff case. The court indicated its next opinion day would come Wednesday, Jan. 14.

Whatever the decision, the case is being closely watched, as companies like Costco (COST) bring lawsuits against the US government in the hope of securing a refund on import duties if the court rejects Trump’s authority to impose tariffs.

The court heard arguments in early November. Both conservative- and liberal-leaning justices asked skeptical questions of the method by which the president imposed his most sweeping duties. Trump imposed his tariffs by invoking a 1977 law meant for national emergencies.

The Trump administration also made appeals to the court last year, and in recent weeks Trump has frequently expressed concern over the ruling, saying losing the ability to tariff other countries would be a “terrible blow” to the US.

“Because of Tariffs, our Country is financially, AND FROM A NATIONAL SECURITY STANDPOINT, FAR STRONGER AND MORE RESPECTED THAN EVER BEFORE,” Trump said in another post on Monday.

US Treasury Secretary Scott Bessent said in an interview that if the high court rules against Trump’s tariffs — which he still views as unlikely — the US Treasury has more than enough funds to cover the costs of any refunds. But, Bessent said, he thinks businesses won’t be passing those refunds back to consumers.

“It won’t be a problem if we have to do it, but ‍I can tell you that if it happens — which I don’t think it’s going to — it’s just a corporate boondoggle,” Bessent told Reuters. “Costco, who’s suing the U.S. government, are they going to ​give the money back to their clients?”

Read more: What Trump promised with his ‘Liberation Day’ tariffs — and what he delivered

LIVE 10 updates

Bessent says US Treasury has enough funds to cover potential tariff refunds

Treasury Secretary Scott Bessent said Friday that he still doubts the US Supreme Court will rule President Trump’s tariffs to be unconstitutional, but that the US Treasury has more than enough funds to provide tariff refunds if that’s what the high court orders. Any such repayments would be spread out up to a year, Bessent told Reuters:

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Brett LoGiurato

The Supreme Court’s next potential tariff decision day

The Supreme Court said Wednesday, Jan. 14, would be the next time it issues opinions — and therefore the next time it could rule on the tariff case.

Of course, a decision on tariffs is not guaranteed, as today showed. The court simply says that rulings on already argued cases are possible when it sets these dates.

We’ll keep circling these on our calendars!

Brett LoGiurato

Supreme Court will not rule on tariffs today

The Supreme Court did not issue a ruling in the case centered on President Trump’s tariffs on Friday, the first day the high court is in session in 2026.

Market watchers had circled Friday as a potential date for the tariff verdict. But the court issued only one opinion today.

The court is in session next week, though it is unclear when they may next issue rulings.

Brett LoGiurato

Lutnick: Modi’s failure to call Trump stalled potential trade deal

Ben Werschkul

How much more complex Trump 2.0 tariffs are — and how much the Supreme Court could roll things back

The ever-increasing complexity of the US tariff landscape has been in evidence for months, but the dawn of 2026 provides a direct measure of just how much additional paperwork US importers must wade through one year into Trump 2.0.

The benchmark of tariff complexity is the so-called tariff book — formally known as the Harmonized Tariff Schedule of the United States — which is the central reference point for importers on what they have to pay the government.

The “basic” version for 2026 was just released and clocks in at over 4,500 pages. That’s more than 100 pages longer than last year (and an 800-page increase from 2017, when Trump first took office).

It’s just one indicator of the increased complexity that comes with a large dash of uncertainty for businesses so far in 2026 as the Supreme Court weighs how much of this new maze of regulations will pass legal muster.

The looming Supreme Court decision, which could be handed down as soon as Friday morning, is already presenting market risks. The complexity issue comes in addition to the tariffs themselves, which the Yale Budget Lab calculates at an average rate for consumers of 16.8%.

Read more here.

Keith Reid-Cleveland

Importers brace for $150 billion tariff refund fight if Trump loses at Supreme Court

Reuters reports:

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Keith Reid-Cleveland

A US trader’s guide to the Supreme Court’s looming tariff ruling

Markets are bracing for any fallout that may come from the Supreme Court’s ruling on whether or not President Trump’s blanket tariffs are legal.

Bloomberg reports:

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Jenny McCall

Market risk mounts as Supreme Court weighs Trump’s emergency tariff powers

The US Supreme Court’s potential decision on President Trump’s tariffs will be a closely watched event on Friday. If the court were to shut down the , it could cause financial markets to roil, as they did in April, when tariffs were first introduced.

Reuters reports:

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Jenny McCall

US October trade deficit lowest since 2009 as imports decline

Jenny McCall

US tariff rates ended 2025 above 15%. Experts don’t expect them to come down much in 2026.

Before President Trump introduced his “Liberation Day” tariffs, the average tariff rate was 2.5%; however, by the end of 2025, that percentage had risen to 15% or more, and experts don’t see that figure coming down in 2026.

Trump may have removed tariffs on staples such as coffee, but the likelihood of the president broadly reducing tariff rates seems slim.

Yahoo Finance’s Washington Correspondent Ben Werschkul looks into the rise in tariff rates and whether a US Supreme Court ruling against Trump’s tariffs and even the midterm elections could impact them.

Read more here.