Key U.S. trading partners in Asia are grappling with renewed uncertainty after the U.S. Supreme Court ruled that many of the tariffs announced by President Donald Trump in 2025 were illegal.
Following Friday’s decision, Trump said he would impose a new flat 15% global tariff on goods entering the United States under a different legal authority. The U.S. Customs and Border Protection confirmed on Monday that it would halt collection of tariffs tied to the earlier measures that formed the backbone of Trump’s trade policy.
The ruling is a setback for governments from India to Indonesia that had spent months negotiating trade deals with Washington, with some pledging billions of dollars in U.S. investments in exchange for lower tariff rates.
Although the 15% rate appears lower than some of the previous levies imposed under Trump’s so-called “Liberation Day” tariffs, analysts say uncertainty remains high. Adam Samdin of Oxford Economics said the administration is still intent on maintaining elevated tariff levels, even if previous measures have been struck down. He added that recent trade agreements lack the binding legal framework of traditional pacts, leaving room for further changes.
China, which is preparing to host Trump in early April, said it is conducting a comprehensive assessment of the ruling’s impact. A spokesperson for China’s Commerce Ministry reiterated Beijing’s opposition to unilateral tariff increases, warning that “there are no winners in a trade war.” U.S. Trade Representative Jamieson Greer, however, told ABC News he did not expect the changes to disrupt talks with Chinese President Xi Jinping, saying the focus would be on maintaining stability and ensuring China meets commitments to purchase American goods.
U.S. allies in the region are also weighing their options. Japan said it would carefully review the ruling and Washington’s response, while Itsunori Onodera of the ruling Liberal Democratic Party warned the higher tariff rate could strain alliances. In South Korea, Industry Minister Kim Jung-kwan said uncertainty remains over possible refunds for previously paid tariffs, though he noted that semiconductors were not covered by the new measures.
Taiwan, a major chip producer, said the direct impact appeared limited but pledged close monitoring and coordination with Washington. Singapore, whose tariff rate was raised from 10% to 15%, said it would seek clarification from U.S. officials and believes certain goods such as pharmaceuticals, electronics and energy products may be exempt.
Recent bilateral deals had lowered U.S. tariffs on countries including Indonesia and Taiwan in exchange for market access and investment commitments, while Japan agreed to boost rare earth production to help diversify U.S. supply chains away from China. Greer told CBS that none of the countries that struck agreements had signaled an intention to withdraw following the court’s decision.
Economists warn that a flat 15% tariff could weigh heavily on Asian economies reliant on exporting finished goods to the United States. Sandra Alday of the University of Sydney said the broader effect will be higher prices for foreign goods in the U.S., with more complex implications for countries supplying intermediate components.
The new tariff is being implemented under Section 122 of the Trade Act, which allows temporary measures for roughly five months before congressional approval is required, adding another layer of uncertainty for global businesses and governments alike.
