Commerce Restricts Polysilicon Stockpiling Forward of December 4 Section 232 Tariffs: What Importers and Customs Brokers Must Know 

On September 24, 2026, the Bureau of Industry and Security (BIS) revealed a short lived last rule at 91 FR 60505 establishing how the Department of Commerce will establish and limit importers that stockpile polysilicon and polysilicon derivatives (Polysilicon Products) earlier than the Section 232 minimal import costs and tariffs below Proclamation 11052 take impact on December 4, 2026. The rule caps weekly import volumes for brand spanking new importers of report, creates a waiver course of, and reminds customs brokers of their enforcement publicity. Importers of polysilicon, the coated HTSUS 3818 merchandise, photo voltaic cells, and photo voltaic modules, together with the customs brokers that file their entries, are affected now. 

Key Takeaways 

• BIS revealed a short lived last rule at 91 FR 60505 on September 24, 2026. It is efficient September 22, 2026, by way of December 3, 2026. 
• Commerce is monitoring current importers of report (IORs). An IOR that Commerce determines is importing Polysilicon Products in volumes considerably larger than its historic averages will likely be prohibited from making additional entries of these merchandise previous to December 4, 2026. 
• New IORs that registered with CBP on or after August 6, 2026, are prohibited from importing above mounted weekly portions by HTSUS subheading, absent Commerce approval. 
• Prohibited or restricted firms could apply to Commerce for a waiver at [email protected]. Commerce intends to reply inside 14 days of receipt. 
• Customs brokers are named within the rule. CBP enforcement actions might probably embody license suspension or revocation proceedings or dealer penalties.

The Window Between the Proclamation and December 4 

Proclamation 11052, “Adjusting Imports of Polysilicon and Its Derivatives Into the United States,” was signed on August 6, 2026 (91 FR 51975). The Proclamation imposed minimal import costs and tariffs on Polysilicon Products below Section 232 of the Trade Expansion Act of 1962 (19 U.S.C. 1862), efficient December 4, 2026, and approved the Secretary of Commerce, in coordination with CBP, to limit imports from firms which are stockpiling these merchandise earlier than that date. 

In the rule, Commerce acknowledged it’s conscious of commerce information from the week after the Proclamation displaying “dramatic will increase in polysilicon imports from some IORs” in contrast with their historic weekly common volumes. Commerce invoked the international affairs operate exemption and the great trigger exceptions of the Administrative Procedure Act. The rule took impact on September 22, 2026, with out prior discover and remark, and it expires December 3, 2026. 

How Commerce Will Identify Stockpiling 

Existing importers of report 

Commerce is monitoring imports of Polysilicon Products to establish IORs which are stockpiling upfront of December 4, 2026. Commerce will make a fact-specific dedication of whether or not an IOR is importing in volumes considerably larger than its historic averages, primarily based on components that embody, however are usually not restricted to: 

• the mixture quantity of Polysilicon Products the importer has imported since August 6, 2026; 
• the weekly common quantity the importer is importing since August 6, 2026; 
• the weekly common quantity the importer imported between January 1, 2026, and August 6, 2026; 
• the weekly common quantity the importer imported in 2025; and 
• using associates that don’t usually import Polysilicon Products, or using new IORs to import Polysilicon Products. 

The rule doesn’t state a numeric threshold for “considerably larger.” When Commerce makes a dedication, it should present CBP written discover, and CBP will notify the IOR and any customs brokers conducting enterprise on behalf of the IOR. That IOR will likely be prohibited from making additional entries of Polysilicon Products into the United States previous to December 4, 2026. 

CBP’s steerage in CSMS # 69994928 (September 22, 2026) states that CBP is not going to enable a restricted IOR to make entries of those merchandise till December 4, 2026. The identical message states that restricted IORs could transfer the products to a bonded warehouse however could not enter them for consumption earlier than December 4, 2026. 

New importers of report 

New IORs that registered with CBP on or after August 6, 2026, are prohibited, absent Commerce approval, from importing Polysilicon Products previous to December 4, 2026, in weekly volumes larger than the next portions: 

Commerce acknowledged these portions are primarily based on historic import information and that it might regulate them sooner or later if it determines an adjustment is critical to deal with stockpiling. A brand new IOR that exceeds these portions, absent approval from Commerce, will likely be prohibited from making additional entries of Polysilicon Products previous to December 4, 2026. The rule additionally offers that Commerce and CBP shall coordinate to take motion in opposition to importers and customs brokers that set up, use, or facilitate a number of importers of report or different preparations for the aim of circumventing this system. 

DTL’s learn: The new-IOR portions are small. A single industrial cargo of modules or cells can exceed the weekly cap. New entities created after August 6 to herald photo voltaic or polysilicon product ought to plan cargo sizing, or a waiver, earlier than items arrive. 

Customs Brokers Are Named within the Rule 

The rule addresses customs brokers that enter Polysilicon Products or act because the importer of report between September 22, 2026, and December 4, 2026, and reminds them of their affirmative obligation to keep away from facilitating violations of the new-IOR limits. In figuring out whether or not a brand new IOR could also be making an attempt to make use of its companies to violate the rule, a customs dealer ought to think about: 

• Status: whether or not the IOR was established on or after August 6, 2026; 
• Import habits: whether or not the brand new IOR has made different entries of Polysilicon Products through the present week and, if that’s the case, the exact quantity entered; 
• Ownership: the direct and oblique useful homeowners of the brand new IOR, whether or not these homeowners have created different new IORs to import Polysilicon Products, and whether or not these IORs have met or exceeded the weekly portions; and 
• Disposition of the merchandise: the final word consignee and supply consumer, and whether or not the products will likely be transferred to or used for the good thing about an IOR topic to a prohibition. 

Under the rule, actions by customs brokers to evade the prohibition could lead to CBP enforcement actions. Commerce acknowledged these might probably embody, however are usually not restricted to, proceedings to revoke or droop the customs dealer’s license below 19 CFR 111.53 or a dealer penalty below 19 U.S.C. 1641. The rule additionally restates the 19 CFR 111.32 prohibition on submitting paperwork identified by the customs dealer to be false, and reminds customs brokers to not give data they know or ought to know to be false or deceptive in any matter pending earlier than DHS. 

DTL’s learn: We count on customs brokers to ask new and current polysilicon and photo voltaic shoppers for useful possession data, weekly entry volumes, and supply particulars earlier than submitting. Importers which have this data prepared will likely be in a greater place to keep away from entry delays. 

Requesting a Waiver from Commerce 

Companies which are prohibited or restricted from importing Polysilicon Products previous to December 4, 2026, could apply to Commerce for a waiver. For an current IOR topic to a prohibition, a waiver permits the corporate to renew importing. For a brand new IOR topic to the weekly amount restriction, a waiver permits the corporate to import in portions topic to the stockpiling restrictions that apply to current IORs. 

BIS will obtain purposes between September 22, 2026, and December 3, 2026. Applications can be found at www.bis.gov/232 and have to be submitted to [email protected]. Under the rule, a sound software should, amongst different necessities: 

• be submitted in PDF format, restricted to 30 pages inclusive of attachments, with a non-confidential public model of any enterprise confidential submission; 
• embody the applicant’s weekly common import volumes for 2025, for January 1 by way of August 6, 2026, and since August 6, 2026, plus the mixture quantity since August 6, 2026; 
• present the eight-digit or ten-digit HTSUS classification and a exact description of the merchandise; 
• clarify how the corporate intends to make use of the imports, together with annual manufacturing quantity and capability charges for every U.S. facility receiving them; 
• disclose using associates or new IORs, and estimate import volumes by way of December 4, 2026, if a waiver is granted; 
• clarify the enterprise concerns for the corporate’s import volumes (for current IORs, why post-August 6 volumes had been grounded in respectable industrial concerns unrelated to the Proclamation; for brand spanking new IORs, why the corporate turned a brand new IOR and whether or not its U.S. buyer relationships predate August 6, 2026); and 
• be signed by a senior official certifying accuracy, and embody a dedication to not stockpile Polysilicon Products previous to December 4, 2026. 

If an software is incomplete or improperly filed, the applicant could, on the discretion of the Under Secretary for Industry and Security, be granted a 48-hour window to resubmit. Commerce could request supplemental data, and it intends to answer purposes inside 14 days of receipt. Commerce acknowledged it should defend the confidentiality of knowledge submitted by firms pursuing a waiver. 

DTL’s learn: The rule describes waivers for firms which are already prohibited or restricted. New IORs are restricted from the date of registration, to allow them to apply earlier than exceeding the weekly caps. For current IORs, the rule doesn’t describe an advance waiver earlier than a prohibition is imposed. With this system ending December 3, a 14-day response goal and a doable supplemental request can eat a significant share of the remaining window. 

Action Items for Solar and Polysilicon Importers 

DTL recommends the next steps now: 

1. Run your personal numbers first. Calculate your weekly common imports by HTSUS for 2025, for January 1 by way of August 6, 2026, and since August 6, 2026. These are the identical metrics Commerce lists within the rule and within the waiver software. 
2. Document the industrial motive for any improve. Gather buy orders, provide contracts, and venture schedules that predate August 6, 2026. If Commerce points a prohibition, this file turns into the core of a waiver software. 
3. Confirm your IOR registration date. Any IOR established on or after August 6, 2026, is topic to the weekly caps whatever the dad or mum firm’s import historical past. 
4. Review affiliate and multi-IOR constructions. The rule lists using associates and new IORs as a stockpiling issue and directs motion in opposition to preparations used to bypass this system. 
5. Coordinate along with your customs dealer. Provide possession, weekly quantity, and consignee data earlier than entries are filed, not after a maintain. 
6. Plan for items already in transit. Under CBP’s steerage, a restricted IOR could place items in a bonded warehouse however could not enter them for consumption earlier than December 4, 2026, when the Section 232 minimal import costs and tariffs take impact. 

Also within the rule: BIS eliminated the aluminum and metal inclusions course of from Supplement No. 1 to fifteen CFR half 705, per Proclamation 11021 of April 2, 2026. 

How Diaz Trade Law Can Help 

Diaz Trade Law advises importers and customs brokers on Section 232 actions, CBP entry and admissibility points, and enforcement issues throughout the photo voltaic provide chain, together with our prior protection of country-of-origin danger for photo voltaic cells and modules in EAPA Case 8163. If your organization has acquired discover of a prohibition, is planning shipments as a brand new IOR, or wants to arrange a waiver software earlier than December 3, contact us at [email protected] or 305-456-3830. 

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