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The purpose of this message is to provide information on the availability of the minimum price floor pursuant to Presidential Proclamation 11052, “Adjusting Imports of Polysilicon and Its Derivatives Into the United States” in the certification (CERT) environment for testing purposes in the Automated Commercial Environment (ACE).
BACKGROUND
On August 6, 2026, the President issued Proclamation 11052, imposing additional duties on certain imports of polysilicon and certain polysilicon derivative products, effective December 4, 2026. See 91 FR 51975.
Proclamation 110502 provides for minimum import prices on imports of polysilicon and polysilicon derivatives.
In advance of the December 4, 2026 effective date, on November 12, 2026, U.S. Customs and Border Protection (CBP) is activating four simulated, unofficial Chapter 99 Harmonized Tariff System of the United States (HTSUS) classifications in the Automated Commercial Environment for certification (testing) purposes only. These simulated, unofficial HTSUS classifications are for testing purposes only.
CBP is also updating Appendix F: Duty Calculation of the CBP and Trade Automated Interface Requirements (CATAIR). The update to Appendix F will be posted under the Draft Chapters: Future Capabilities section on CBP.gov. The update includes:
- Duty Comp Code L: Specific Tariff Equal to the Difference Between the Entered Value and Minimum Import Price
- Duty Comp Code M: Specific Tariff Equal to the Applicable Minimum Import Price
CBP recommends that the trade community submit test entries in the certification environment to ensure that their systems are ready to submit entries by December 4, 2026, the effective date of the polysilicon duties.
Effective November 12, 2026, for testing purposes only in the certification environment in ACE, the following simulated, unofficial Chapter 99 HTSUS are available for testing of the tariff based on minimum import prices:
Minimum Import Prices (Duty Comp Code L):
9903.45.43: For testing of $21 per kilogram minimum import price for imports classified under HTSUS 2804.61.00.
Submit a tariff equal to the difference between the entered value and the minimum import price.
Calculate the tariff as follows:
Step 1: Calculate the per unit value (value/quantity). If less than $21 per kilogram (the per unit minimum import price), proceed to the following steps.
Step 2: Multiply $21 per kilogram by the import quantity =Total minimum import price
Step 3: Subtract the entered value from the total minimum import price =Tariff amount
If the per unit value is greater than or equal to the per unit minimum import price, report zero as the tariff amount.
9903.45.45: For testing of $0.22 per watt minimum import price for imports classified under HTSUS 8541.42.00.
Calculate the tariff as follows:
Step 1: Calculate the per unit value (value/quantity). If less than $0.22 per watt (the per unit minimum import price), proceed to the following steps.
Step 2: Multiply $0.22 per watt by the import quantity (in watts) =Total minimum import price
Step 3: Subtract the entered value from the total minimum import price =Tariff amount
If the per unit value is greater than or equal to the per unit minimum import price, report zero as the tariff amount.
Minimum Import Prices Based on Specific Tariff (Duty Comp Code M):
9903.45.47: For testing of $21/kg specific tariff rate for imports classified under HTSUS 2804.61.00.
$21/kg specific tariff rate
9903.45.49: For testing of $0.22/watt specific tariff rate for imports classified under HTSUS 8541.42.00.
$0.22/watt specific tariff rate.
As noted above, the Chapter 99 HTSUS listed in this message are simulated, unofficial Chapter 99 HTSUS for testing purposes only. The information in this CSMS is not to be used for actual entry/entry summary filing. Consult Chapter 99 of the HTSUS on www.usitc.gov for the current Chapter 99 HTSUS in effect. CBP will provide entry filing guidance for the official Chapter 99 HTSUS for polysilicon and polysilicon derivatives in the ACE production environment prior to December 4, 2026.
For any technical questions regarding this update, please contact your assigned Client Representative. Questions or concerns should be directed to Entry Summary Accounts & Revenue Division (ESAR) at esar@cbp.dhs.gov.
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