Executive Summary
An additional 15 percent ad valorem duty and the minimum import price program are scheduled to apply to covered goods entered for consumption, or withdrawn from warehouse for consumption, on or after December 4, 2026.
The minimum prices are $21 per kilogram for polysilicon, $100 per kilogram for ingots and wafers, $0.22 per watt for solar cells, and $0.38 per watt for solar modules.
At entry, importers must document that the first arm's-length U.S. sale, or an applicable downstream sale, will meet the minimum price, or that the first sale is under qualifying pre-proclamation contract terms.
The additional duty has special rules for products of named trading partners, while the specific tariff under the minimum price program can apply separately.
The polysilicon Section 232 tariff and minimum import price program are scheduled to apply to covered goods entered for consumption, or withdrawn from warehouse for consumption, starting December 4, 2026. Proclamation 11052, Adjusting Imports of Polysilicon and Its Derivatives Into the United States, signed August 6 and published August 11, establishes the prices, entry documentation rules, and additional duty. The measures are not yet in force as of August 11, 2026.
Which Polysilicon Goods Are Covered?
The proclamation applies the minimum import price program to polysilicon and polysilicon derivatives specified in its Annexes I and II. Its stated minimum prices cover polysilicon, polysilicon ingots and wafers, solar cells, and solar modules. These prices are category-specific: $21 per kilogram for polysilicon; $100 per kilogram for ingots and wafers; $0.22 per watt for solar cells; and $0.38 per watt for solar modules.
The additional 15 percent ad valorem duty is stated to cover polysilicon ingots and polysilicon derivatives specified in Annexes I and II. The proclamation does not make the duty description identical to the MIP description, which covers polysilicon and its derivatives. Do not assume that every product subject to an MIP also bears the additional duty, or that a product is covered based only on its commercial description.
The annexes determine the specified goods. Confirm that the product and its tariff classification fall within them before applying the measures. The Secretary may adjust the MIPs from time to time to reflect market conditions or other factors affecting fair market value under non-distorted, free-market conditions.
What MIP Documents Must Importers Submit?
For covered goods, CBP must permit importers to submit documentation at entry establishing or certifying either that the first arm's-length sale of the imported merchandise in the United States, or an applicable first arm's-length sale of downstream products made from it, will occur at or above the applicable MIP; or that the first arm's-length sale of the imported merchandise is pursuant to fixed contract terms entered into before the proclamation was signed on August 6, 2026.
The two documentation routes are alternatives. The contract route concerns the first arm's-length sale of the imported merchandise and requires fixed terms in a contract entered into before signing. The sale-price route can address the imported merchandise or, if applicable, downstream products made from it. The proclamation does not say that an importer can satisfy the documentation requirement simply by showing an entered value at or above the MIP.
If the importer submits no qualifying documentation, the goods are subject to a specific tariff equal to the applicable MIP. If the importer submits documentation but the entered value on the entry summary is below the MIP, the specific tariff equals the difference between that entered value and the MIP. These consequences are separate from the additional ad valorem duty where that duty applies.
How Do the Polysilicon Duties Vary by Origin?
The proclamation sets an additional 15 percent ad valorem duty on covered ingots and derivatives, subject to special rules. For products of Japan, Korea, Taiwan, Switzerland, Liechtenstein, or a member nation of the European Union, the additional Section 232 duty plus the applicable Column 1 duty rate must equal 15 percent. For products of the United Kingdom, the applicable rate under the proclamation is 10 percent.
These origin-specific rules change the additional duty, not the stated MIP prices or the MIP documentation requirements. The proclamation says its duties apply in addition to other applicable duties, taxes, fees, exactions, and charges, except where it specifies otherwise. It also says the duties continue unless expressly reduced, modified, or terminated.
Manufacturing drawback is available only for claims that meet the stated conditions: the article is not a type of merchandise subject to an antidumping or countervailing duty order; it is a product of a defined Trade Agreement Partner; and its polysilicon content is entirely from a Trade Agreement Partner country. The named partners include the United Kingdom, European Union, Japan, Republic of Korea, Switzerland, Liechtenstein, Mexico, Canada, and a trading partner with which the United States concludes a trade and security agreement.
When Do the Polysilicon MIPs and Duty Start?
- Proclamation signed: August 6, 2026. The proclamation was signed on this date, which also sets the cutoff for qualifying fixed contract terms.
- Proclamation published: August 11, 2026. Publication does not make the entry measures effective immediately.
- MIP and duty start: December 4, 2026. The measures apply to covered goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. eastern time.
- Onshoring construction commitment: January 20, 2029. A company seeking an approved onshoring plan must commit to start construction by this date.
What Should Polysilicon Importers Do Before December 4?
Match products to the annexes. Review each product's specifications and tariff classification against Annexes I and II. Keep MIP exposure distinct from additional-duty exposure because the proclamation describes their product coverage differently.
Prepare the entry evidence. Identify the first arm's-length U.S. sale, including any applicable downstream sale, and determine whether it will meet the applicable MIP. If relying on the contract route, retain the contract and verify that its fixed terms were entered into before August 6, 2026.
Model both tariff outcomes. Compare the entry-summary value with the applicable MIP and determine whether the specific MIP tariff could apply. Separately calculate the additional duty using the product's origin and applicable Column 1 rate, including the special rules for the named partners.
Review supply-chain and zone plans. Confirm the planned consumption-entry or warehouse-withdrawal date. Products subject to the duties and admitted to a foreign-trade zone on or after the effective date generally must enter under privileged foreign status, except products eligible for domestic status.
What Remains Unclear About the Polysilicon Measures?
The proclamation's operative coverage depends on Annexes I and II, and it authorizes the Secretary to make technical corrections to those annexes and other HTSUS modifications through Federal Register notice. Importers should verify the annex coverage and any later corrections before entry rather than infer coverage from the four MIP price categories.
The proclamation requires CBP to monitor and enforce documentation accuracy. If CBP finds documentation materially inaccurate or an importer materially fails to comply with its certification, the importer and its affiliates are permanently prohibited from importing covered goods, and CBP may impose penalties consistent with applicable law. The proclamation does not specify the operational documentation format, how the first sale will be verified in particular transaction structures, or how an importer should allocate a downstream sale price across covered goods.
The Secretary is authorized to establish an onshoring incentive program and may solicit and approve company plans. Approved companies may receive duty-free treatment for necessary production equipment and covered products in volumes the Secretary deems commensurate with committed investment, subject to construction-period, progress, and other conditions. The proclamation does not itself state that applicants already qualify for those benefits or set an application process or approval timeline.
Sources
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