Trump signs executive order imposing 15% tariffs on polysilicon imports

Executive order signed

President Donald Trump signed an executive order on Thursday imposing tariffs on imported polysilicon and its derivatives, materials used in both semiconductors and solar panels. The order aims to reduce U.S. reliance on foreign supplies that the administration says threatens national security. White House aide Will Scharf said the order lays out "a series of trade and tariff actions under Section 232, intended to ensure that domestic polysilicon manufacturing is properly supported and protected from overseas dumping and offshore threats." The measures include a 15% tariff on imported polysilicon derivatives and the creation of a new price floor, which Reuters had reported could be unveiled as soon as Thursday. Polysilicon is used in semiconductors but is also important for creating solar panels, according to the Commerce Department.

Implementation timeline disputes

The tariff and price floor were initially slated to take effect 120 days following the announcement, according to four sources cited by Reuters. Some U.S. solar manufacturers lobbied the administration for a shorter 90-day implementation period, arguing that an extra month would give China, a top producer of polysilicon products, too much time to sell into the United States and undercut domestic rivals. The administration is expected to reject those requests for a speedier timeline, a person familiar with the matter told Reuters. Earlier on Thursday, Bloomberg reported that officials were weighing a months-long delay in collecting the planned tariffs, a phase-in period that could encourage a rush of imports by renewable-energy companies working on U.S. projects before the duties take hold.

Commerce Department rationale

Commerce Secretary Howard Lutnick appeared alongside Trump at the White House and framed the measures as part of a broader effort to reshore supply chains. The Commerce Department launched an investigation into national security risks in the polysilicon supply chain in July 2025. Lutnick said the order would set a price floor "so that the Chinese can't dump anymore" and predicted growth for the domestic industry. Lutnick justified the tariffs by saying they would bring back to the United States a production currently dominated by China.

We're making the products here, but we need to bring the supply chain here. This will bring the supply chain here... we've got the industry here, it's too small, and it's going to explode.

Criticism and broader context

A Bloomberg opinion piece published Thursday argued that the tariffs and price floors would hurt America's allies rather than China, as its title stated. The piece contended that "if there's one way to further entrench Beijing's position in high-tech supply chains, however, it's to give in to that protectionist urge" and that "every justification for trade restrictions in 2026 must dress itself up in paranoia about Chinese industrial policy." The administration has framed the measures as its latest attempt to eliminate what it calls Chinese choke points in the global supply chain for solar panels and semiconductors. The executive order follows the Commerce Department investigation that began in July 2025 and represents part of a broader push to reduce dependence on Chinese manufacturing in critical technology sectors.