America's Solar Import Floor Arrives December 4 - and the Entry Date Is Everything

The counting has started. Proclamation 11052, signed on 6 August, puts minimum import prices and additional duties on polysilicon, ingots, wafers, cells and modules into force at 12:01 a.m. Eastern on 4 December 2026, and it applies to goods entered or withdrawn from warehouse for consumption on or after that moment. The trigger is the customs entry date - not the purchase order, not the vessel departure. Panels shipped in late November that clear customs on 5 December pay under the new rules, and the proclamation text contains no goods-in-transit exemption.

The mechanics deserve a closer look because they differ from a plain tariff. Each product category carries a floor: $21 per kilogram for polysilicon, $100 per kilogram for ingots and wafers, $0.22 per watt for cells and $0.38 per watt for modules. The floor is tested against the first arm's-length sale in the United States; if the entered value sits below it, a specific tariff equal to the gap applies, and if the value clears the floor, the 15 percent duty attaches to the actual declared value. The United Kingdom faces 10 percent, while the EU, Japan, Korea, Taiwan (China), Switzerland and Liechtenstein are capped at a combined 15 percent. Scope runs by HTS number through the annexes, so classification comes before any rate arithmetic, and antidumping and countervailing duties stack separately on top.

The market has already voted with its warehouse. US solar equipment inventories rose 126 percent year over year in the second quarter as developers pulled purchases forward, which takes some sting out of the December deadline for projects already funded and under construction. The exposure that remains sits in long-term procurement for 2027 and beyond, where developers without change-in-law clauses are negotiating risk-sharing into new contracts. Sabah Bayatli, chief executive of OCI Energy, told pv magazine USA that tariffs not baked into the financial model eventually flow into power purchase agreement pricing - the cost does not vanish, it migrates to the offtaker.

Two open items will decide how messy the first weeks are. Customs and Commerce had still not published the self-certification procedures importers need to clear shipments as of pv magazine USA's 6 November report, which leaves 2027 delivery costs unpriceable today. And final AD/CVD determinations on cells from India, Indonesia and Laos were made in September with an affirmative injury vote in October, but the resulting orders had not appeared in the Federal Register by early November - one more layer whose exact rate nobody can quote yet. Importers with cargo closing across 4 December should finish HTS classification and origin documentation now, and treat the proclamation's exception for fixed-term contracts signed before 6 August as the single most valuable clause in the text. North America port and routing options are on our USA route page.

Source: Based on pv magazine USA (6 November), the text of Proclamation 11052, the Hunton law firm summary and trade-compliance outlet CargoLinked.