Commerce’s Anti-Stockpiling Rule Imposes Limits on Pre-December 4 Polysilicon Imports

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On September 24, 2026, the Bureau of Industry and Security (BIS) published a temporary final rule implementing the anti-stockpiling directive in Proclamation 11052, the Section 232 action that imposes minimum import prices (MIPs) on polysilicon and its derivatives, plus a 15 percent ad valorem duty on ingots, wafers, cells, and modules, beginning December 4, 2026.[1] The rule took effect September 22, two days before publication, and runs through December 3.[2] It was issued without notice and comment. To justify skipping those steps, BIS cites trade data showing sharp import increases by some importers in the week after the Proclamation issued.[3]

The rule targets companies that responded to the Proclamation by pulling deliveries forward or setting up new import entities. Cost is no longer the only question for deliveries before December 4. Whether product can be entered at all turns on the identity of the importer of record (IOR) and how the IOR’s current import volumes compare to its historical import volumes.

Two Tracks

Existing importers. IORs registered with U.S. Customs and Border Protection (CBP) before August 6, 2026, may continue importing, subject to monitoring. If Commerce determines that an IOR is importing in volumes substantially greater than its historic averages, it notifies CBP, CBP notifies the IOR and its customs brokers, and the IOR is barred from further entries of covered products until December 4.[4] The rule does not set hard caps. Rather, Commerce will compare post-August 6 volumes against weekly averages for 2025 and early 2026. Commerce will also look for use of affiliates or new IORs.[5] The rule provides no advance notice of, or opportunity to respond to, a prohibition. Commerce will look back to imports since August 6, so volumes already entered count.

New importers. IORs that registered on or after August 6 face hard weekly caps absent Commerce approval:[6]

HTSUS	Product	Weekly Cap
2804.61.00	Polysilicon	12 kg
3818.00 (five statistical lines)	Polysilicon ingots and wafers	7 kg
8541.42.00	Solar cells	2,000 units
8541.43.00	Solar modules	55 units

At typical utility-scale module ratings, 55 modules per week is roughly 30 to 40 kilowatts.[7] A new IOR that exceeds a cap in any week is barred until December 4, and BIS and CBP will coordinate enforcement against importers and brokers that use multiple IORs or similar arrangements to circumvent the caps.[8] Under guidance CBP issued with the rule, a restricted importer may still move covered goods into a bonded warehouse, but may not enter them for consumption before December 4; when withdrawn, they will be subject to the MIP and duty.[9] The guidance does not address foreign-trade zones or goods in transit.

The Waiver, and Who Can Use It

Restricted importers may apply to BIS for a waiver through December 3.[10] Applications require beneficial ownership information, weekly volume histories, the intended use of the imports (including capacity data for each receiving facility), a legitimate business purpose, a no-stockpiling commitment, and a senior officer’s certification under penalty of perjury.[11] The application must be in a PDF that does not exceed 30 pages. BIS intends to respond within 14 days of receipt of an application.[12] The application window opened September 22, and BIS has since posted the application form, a spreadsheet, on its Section 232 page.[13]

Three features matter for buyers and suppliers alike. First, only importers may apply.[14] A developer buying delivered duty paid (DDP) from a supplier acting as IOR cannot seek relief in its own name; the waiver depends on the supplier’s import history. Second, the application is built around manufacturing. It asks what the applicant makes and for production data at each receiving facility, although the posted form also lets an importer say that goods will go to third parties or to a solar installation.[15] Third, a waiver does not end scrutiny: for a new IOR, it moves the importer into existing-importer treatment, where monitoring continues.[16] The rule does reserve a second applicant category, which leaves room for BIS to extend eligibility beyond importers.[17]

The rule also makes customs brokers gatekeepers. Brokers must consider a new IOR’s registration date, same-week entries, beneficial owners and affiliated IORs, and ultimate consignee. Customs brokers face license suspension or revocation and penalties for facilitating evasion.[18] Brokers that drop a client they conclude is intentionally attempting to defraud the government must also report the separation to CBP.[19] Expect brokers to request ownership and consignee information before filing, and build that time into delivery schedules.

Conclusion

An established IOR importing at its historic pace faces the least exposure, although with no numeric threshold, no importer can be sure where Commerce will draw the line. The exposure sits with accelerated delivery schedules, newly formed import entities, and arrangements that route product through affiliates. In each case, the importer of record, not the buyer, determines whether goods can be entered and whether relief can be sought, so the identity and import history of the IOR now bear directly on delivery risk under existing supply agreements. Although the rule expires December 3, product shut out now can be entered only on or after December 4, when the MIP and the 15 percent ad valorem duty apply. Parties with deliveries scheduled before December 4 should confirm the IOR’s position now.

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[1]       Measures To Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052, 91 Fed. Reg. 60505 (Sept. 24, 2026) (to be codified at 15 C.F.R. pt. 705, supp. no. 1) (TFR); Proclamation No. 11052, Adjusting Imports of Polysilicon and Its Derivatives Into the United States, 91 Fed. Reg. 51975, 51977 to 51978 (Aug. 11, 2026) (cls. (1), (2), (4)); id. at 51985 (Annex II, heading 9903.45.30).

[2]       TFR, 91 Fed. Reg. at 60505 (Dates); 15 C.F.R. pt. 705, supp. no. 1, para. (c), 91 Fed. Reg. at 60509.

[3]       TFR § VI.3, 91 Fed. Reg. at 60507 to 60508 (invoking 5 U.S.C. § 553(a)(1), (b)(B), (d)(3)).

[4]       TFR § II, 91 Fed. Reg. at 60505; 15 C.F.R. pt. 705, supp. no. 1 (introductory text), 91 Fed. Reg. at 60508 to 60509. The Proclamation directs the Secretary to restrict imports by a stockpiling company “and its affiliates.” Proclamation No. 11052, cl. (11), 91 Fed. Reg. at 51980.

[5]       TFR § II, 91 Fed. Reg. at 60505.

[6]       15 C.F.R. pt. 705, supp. no. 1, para. (h) & tbl. 1, 91 Fed. Reg. at 60509 to 60510; TFR § III, id. at 60505. Table 1 tracks each HTSUS provision listed in Annex I to the Proclamation. See Proclamation No. 11052, 91 Fed. Reg. at 51982 to 51983 (Annex I).

[7]       Assumes crystalline silicon modules rated approximately 550 to 720 watts, the typical range for current utility-scale product. At those ratings, 55 modules total approximately 30.3 to 39.6 kilowatts.

[8]       TFR § III, 91 Fed. Reg. at 60506; see also Proclamation No. 11052, cl. (13), 91 Fed. Reg. at 51980 (authorizing rules to prevent circumvention and evasion).

[9]       U.S. Customs & Border Prot., CSMS # 69994928, GUIDANCE: Import Ban of Certain Polysilicon Products Under Proclamation 11052 (Sept. 22, 2026); Proclamation No. 11052, cls. (2), (4), 91 Fed. Reg. at 51977 to 51978 (applying the MIP and duty to goods entered for consumption, or withdrawn from warehouse for consumption, on or after December 4, 2026).

[10]     15 C.F.R. pt. 705, supp. no. 1, paras. (c), (d)(1) to (d)(3), 91 Fed. Reg. at 60509.

[11]     Id. para. (d)(5) to (d)(18), 91 Fed. Reg. at 60509; TFR § IV, id. at 60506.

[12]     15 C.F.R. pt. 705, supp. no. 1, para. (f), 91 Fed. Reg. at 60509.

 [13]    Bureau of Indus. & Sec., U.S. Dep’t of Com., Section 232 Investigations, https://www.bis.gov/232 (visited Oct. 8, 2026) (posting “Request to Waive Restrictions on Imports of Polysilicon and Its Derivatives Form”); see also OMB Control No. 0694-0149 (estimating 165 responses at two hours each).

[14]     15 C.F.R. pt. 705, supp. no. 1, para. (b)(1), 91 Fed. Reg. at 60509; see also id. para. (a) (limiting scope to directly affected parties located in the United States).

[15]     15 C.F.R. pt. 705, supp. no. 1, para. (d)(13), 91 Fed. Reg. at 60509; see also id. para. (d)(19) (inviting applicants to explain why a listed requirement is inappropriate or inapplicable to their situation).

[16]     TFR § IV, 91 Fed. Reg. at 60506.

[17]     15 C.F.R. pt. 705, supp. no. 1, para. (b)(2), 91 Fed. Reg. at 60509 (“[Reserved]”).

[18]     15 C.F.R. pt. 705, supp. no. 1, para. (g), 91 Fed. Reg. at 60509; TFR § III, id. at 60506; 19 C.F.R. §§ 111.32, 111.53(c) to (d); 19 U.S.C. § 1641(d)(1)(C) to (D), (d)(2).

[19]     19 C.F.R. § 111.32.