Trump likely to reject 90-day polysilicon tariff push

The Trump administration is expected to reject industry requests to accelerate a new 15 percent tariff and price floor on polysilicon imports, keeping the 120-day window, a person familiar with the matter said.

Some U.S. solar manufacturers have lobbied for a 90-day timeline, arguing the extra month would give China — a top producer of polysilicon products — too much time to sell into the United States and undercut domestic rivals, four sources said.

The tariff, which Reuters reported could be unveiled as soon as Thursday, stems from a Section 232 investigation launched in 2025 targeting polysilicon derivatives used in solar panels and semiconductor fabrication. The measure pairs a 15 percent import duty with a price floor mechanism designed to shield U.S. producers from below-market Chinese pricing.

The decision carries direct implications for the U.S.-China trade relationship. China has already imposed anti-dumping duties on polysilicon from the United States and South Korea, and prediction markets have priced a lower likelihood of a near-term visit to Washington by Chinese President Xi Jinping following the tariff escalation.

The Section 232 probe marks the latest escalation in a trade conflict that has reshaped global solar supply chains. U.S. polysilicon producers have argued that Chinese manufacturers benefit from state subsidies and can flood the market at prices below production cost. The 15 percent tariff, while lower than the 50 percent duties imposed on some Chinese goods in earlier rounds, targets a critical input for both solar panels and semiconductor fabrication.

China's response has been swift. Beijing imposed anti-dumping duties on polysilicon imports from the United States and South Korea, squeezing U.S. exporters that had previously relied on Chinese demand for growth. The retaliatory measures have pressured U.S. polysilicon producers even as domestic demand for solar components rises on the back of federal clean energy incentives.

Timeline stakes for supply chains

The distinction between a 90-day and 120-day implementation window is not academic. Each additional month allows Chinese producers to ship inventory into the U.S. market before the tariff and price floor take effect, potentially depressing prices for domestic manufacturers. Industry groups have estimated that a single month of unimpeded imports could represent hundreds of millions of dollars in shipments, though exact figures have not been disclosed.

For downstream solar developers, the longer timeline offers a window to lock in lower-cost polysilicon before prices rise. The price floor mechanism, which sets a minimum import price, is designed to prevent Chinese producers from dumping product below cost — a practice the Commerce Department has cited in previous trade actions.

The administration's decision to maintain the 120-day window suggests a preference for procedural consistency over industry expediency, even as some Republican lawmakers have pushed for faster action. The tariff announcement, expected as soon as Thursday, will trigger the countdown clock regardless of the final timeline.

The broader trade picture remains fluid. The Section 232 designation gives the administration broad authority to adjust tariff levels without congressional approval, a tool that has been used sparingly but carries significant weight in trade negotiations. If China responds with further retaliatory measures, the solar supply chain could face additional disruption beyond the polysilicon segment.

For investors, the key variable is timing. Solar manufacturers with domestic production exposure could benefit from the price floor once implemented, while developers reliant on imported polysilicon face higher input costs. The 120-day window provides a defined period for market participants to adjust procurement strategies before the new trade regime takes effect.

This article is for informational purposes only and does not constitute investment advice.