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Section 232 tariffs on polysilicon and its derivatives

Polysilicon and solar tariff (Section 232)

Announced, not yet in effectFrom Dec 4, 2026

What it is

Announced, starting Dec 4, 2026. Polysilicon ingots and wafers, solar cells and solar modules pay a Section 232 tariff of 15% on top of the base rate; for Japan, South Korea, Taiwan, Switzerland, Liechtenstein and the EU the base rate and the tariff together come to 15%; for the United Kingdom the tariff is 10%. Polysilicon and these products also get minimum import prices ($21/kg for polysilicon; $100/kg for polysilicon ingots and wafers; $0.22/W for solar cells; $0.38/W for solar modules): an importer who doesn't document a US resale at or above the minimum pays a specific duty equal to it, and one whose entered value is below it pays the difference. Until then, Commerce can bar importers it finds stockpiling. Not yet in the tariff schedule.

Legal authority: Section 232 of the Trade Expansion Act of 1962, as amended; Proclamation 11052 of Aug 6, 2026. Section 232 of the Trade Expansion Act of 1962 lets the President adjust imports of goods that the Commerce Department finds threaten to impair national security, including by adding duties.

It reaches 7 listed tariff codes or code groups (a listed heading or subheading covers every code under it).

Check a product

Rates

"+" rates are added on top of the regular duty. Chapter 99 headings are the numbers filed on the entry along with the product's own code.

  • +15%Since Dec 4, 2026
    Origin
    All countries
    Products
    Products under 3818.00.0020, 3818.00.0040, 3818.00.0045, 3818.00.0050, 3818.00.0091, 8541.42.00, 8541.43.00 (7 codes listed)
    Heading
    9903.45.30
  • 15% in place of the regular dutySince Dec 4, 2026
    When the regular (column 1) rate is under 15%
    Origin
    European Union, Japan, Liechtenstein, South Korea, Switzerland, Taiwan
    Products
    Products under 3818.00.0020, 3818.00.0040, 3818.00.0045, 3818.00.0050, 3818.00.0091, 8541.42.00, 8541.43.00 (7 codes listed)
    Heading
    9903.45.31
  • +10%Since Dec 4, 2026
    Origin
    United Kingdom
    Products
    Products under 3818.00.0020, 3818.00.0040, 3818.00.0045, 3818.00.0050, 3818.00.0091, 8541.42.00, 8541.43.00 (7 codes listed)
    Heading
    9903.45.32

How it combines with other duties

Charged in addition to any other duties, taxes, fees, exactions and charges, except as the proclamation specifies (clause (5)(a)), including on top of trade-agreement and preference rates (Annex II, note 42(b)). Antidumping and countervailing duties still apply (note 42(b)).

What changed

Sources

  1. Proclamation 11052 of Aug 6, 2026, Adjusting Imports of Polysilicon and Its Derivatives Into the United States, 91 FR 51975, Aug 11, 2026
  2. Commerce (BIS), Measures To Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052, temporary final rule, 91 FR 60505, Sep 24, 2026
  3. CBP CSMS # 69994928, GUIDANCE: Import Ban of Certain Polysilicon Products Under Proclamation 11052, Sep 22, 2026

Checked against these sources on Oct 1, 2026. Rates shown are what CBP collects; antidumping and countervailing duties are separate.

All Section 232 tariffs