According to money.udn.com, the Trump administration will impose a 15% tariff on polysilicon and derivative products effective December 4, invoking Section 232 of the 1962 Trade Expansion Act. Taiwan is exempt from stacking with MFN duties, and semiconductor firms can secure exemption quotas through the Taiwan-U.S. investment MOU, per Taiwan's Ministry of Economic Affairs.
What Does the Trump Administration's Polysilicon Tariff Policy Contain, and What Is Its Legal Basis?
According to a report from ec.ltn.com.tw, U.S. officials indicated that the Trump administration was expected to announce as early as Thursday, August 6, a 15% tariff on polysilicon products, alongside a series of minimum import price floors (E8, E9). Reporting from money.udn.com confirms that President Trump signed a presidential proclamation on August 6 (U.S. Eastern Time), invoking Section 232 of the 1962 Trade Expansion Act following a national security investigation, imposing a 15% tariff on polysilicon and its derivative products from all countries, effective December 4 (E1, E4). The proclamation also establishes a minimum import price mechanism, and specifically exempts Taiwan, Japan, South Korea, and the European Union from having the 15% tariff stacked on top of existing Most Favored Nation (MFN) duties (E4). Per ec.ltn.com.tw, this measure follows a Section 232 national security investigation conducted by the U.S. Department of Commerce that lasted approximately one year (E10).
How Large Are Taiwan's Polysilicon and Related Product Exports to the U.S., and What Is Their Structure?
Taiwan's Ministry of Economic Affairs, cited by money.udn.com, stated that Taiwan's polysilicon-related exports to the United States totaled approximately $320 million, accounting for roughly 25% of Taiwan's global exports of the same product category (E5). Within that total, silicon wafer exports to the U.S. alone were valued at approximately $250 million, supplied mainly to U.S. semiconductor manufacturers (E5). The ministry further noted that Taiwan's exports to the U.S. in this category are dominated by semiconductor-grade silicon wafers rather than solar-grade materials (E2).
How Can Taiwanese Firms Obtain Tariff Exemptions Through Investment Cooperation Mechanisms?
According to the Ministry of Economic Affairs, as reported by money.udn.com, Taiwanese semiconductor companies can reduce the impact of the new tariff by securing exemption quotas through the Taiwan-U.S. investment cooperation mechanism (E2). Specifically, under the Taiwan-U.S. investment cooperation memorandum of understanding (MOU), companies investing in U.S. facilities can obtain exemption quotas equal to 2.5 times their future production capacity during the construction phase, and 1.5 times capacity once production begins (E6).
How Does the Impact of This Tariff Differ Across Taiwan's Industries?
The impact diverges sharply between the semiconductor and solar sectors. Per money.udn.com, Taiwan's semiconductor-grade silicon wafer exports to the U.S. reached about $250 million out of the $320 million total polysilicon-related export value (E5). By contrast, the Ministry of Economic Affairs stated that Taiwan does not currently produce solar-grade silicon wafers domestically; its exports to the U.S. in this space consist mainly of solar cells and modules, and represent only about 1% of the domestic solar industry's overall output value (E7). Because of this low export dependency, the ministry concluded that the overall impact on Taiwan's solar photovoltaic industry would be limited (E3).
What Relief Measures Has the U.S. Government Designed for Domestic Manufacturers?
According to ec.ltn.com.tw, U.S. officials also plan to implement a temporary credit program intended to shield domestic manufacturers that currently still depend on imported raw materials from the impact of the new tariff (E11). Separately, for foreign partners such as Taiwan, the exemption quota structure under the Taiwan-U.S. investment MOU — 2.5 times capacity during construction and 1.5 times capacity after production begins — serves a comparable function of cushioning tariff exposure for firms building U.S. capacity (E6).
What Alternative Approach Has U.S. Industry Proposed Instead of Tariffs?
The Consumer Technology Association pushed back on the tariff approach, according to ec.ltn.com.tw. The association argued that the government should instead pursue non-tariff strategies — such as signing agreements with other countries and building a domestic strategic reserve — to address the national security risks associated with dependence on foreign polysilicon (E12).
Key Figures at a Glance
| Metric | Value | Source |
|---|
| Tariff rate on polysilicon and derivatives | 15% | money.udn.com / ec.ltn.com.tw |
| Effective date | December 4 | money.udn.com |
| Section 232 investigation duration | ~1 year | ec.ltn.com.tw |
| Taiwan's polysilicon-related exports to U.S. | ~$320 million | money.udn.com |
| Taiwan's share of global exports in category | ~25% | money.udn.com |
| Taiwan's silicon wafer exports to U.S. | ~$250 million | money.udn.com |
| Solar exports as share of Taiwan's domestic solar output | ~1% | money.udn.com |
| MOU exemption quota during construction | 2.5x future capacity | money.udn.com |
| MOU exemption quota after production begins | 1.5x capacity | money.udn.com |
What This Means
The evidence points to a policy that treats Taiwan differently from a blanket tariff target: while the 15% duty applies to all countries under the Section 232 proclamation, Taiwan avoids stacking with MFN rates and can access exemption quotas of up to 2.5 times capacity through the investment MOU (E4, E6). This structure aligns with the export data — the $250 million in semiconductor-grade silicon wafers, which make up the bulk of Taiwan's $320 million exposure, feeds directly into the same U.S. semiconductor supply chain that the MOU mechanism is designed to protect (E5, E2). Meanwhile, Taiwan's solar sector, exposed to less than 1% of domestic output value in U.S. sales, sits largely outside the policy's practical reach (E7, E3). On the U.S. side, the parallel introduction of a temporary credit program for import-dependent domestic manufacturers (E11) and the Consumer Technology Association's call for non-tariff alternatives (E12) suggest that even within the U.S., there is no consensus that tariffs are the only tool needed to address the national security concerns identified by the year-long Commerce Department investigation (E10).