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If you've been holding off on a solar quote to see where prices land, the government just answered part of that question for you. As of August 6, 2026, there's a hard floor under solar panel prices in the U.S. And for the first time, it isn't just a tariff percentage that moves with paperwork. It's a fixed dollar number written into federal law that no importer is legally allowed to sell below.
Disclaimer: This article summarizes a federal trade proclamation as of August 17, 2026. It isn't legal, tax, or compliance advice, and the rule doesn't take effect until December 4, 2026, so plenty can still shift between now and then.
Key takeaways
- There's now a $0.38/W minimum price on solar modules. Under Presidential Proclamation 11052, any solar module made with imported cells or wafers cannot legally be sold in the U.S. below $0.38 per watt, before the separate 15% tariff is even added on top.
- The floor applies at every stage of the supply chain, not just the finished panel. Polysilicon ($21/kg), ingots and wafers ($100/kg), and cells ($0.22/W) all have their own minimum import prices, so the cost gets locked in before it ever reaches a module.
- The rule takes effect December 4, 2026 — 120 days after signing. Goods imported before that date, including under fixed-price contracts signed before August 6, are largely unaffected.
- The floor can only move in one direction before then. Commerce can raise the minimum import prices "to reflect market conditions" at any point before implementation — there's no equivalent mechanism to lower them.
- This mostly targets imported cells, and over 90% of U.S. panel production still relies on them. Domestic cell manufacturing capacity (3.2 GW) covers a small fraction of the 65.5 GW of U.S. module assembly capacity, so most "assembled in the USA" panels are still built from imported cells that this rule now prices at a floor.
What Is a Minimum Import Price, and Why Does $0.38/W Matter?
Should you wait to go solar? Let's ask the expertsA tariff taxes a transaction. A Minimum Import Price (MIP) does something blunter: it sets a dollar figure below which a sale legally cannot happen, tariff or no tariff. Proclamation 11052 sets four of them, stacked down the solar supply chain:
- $21 per kilogram for raw polysilicon
- $100 per kilogram once it's been processed into ingots and wafers
- $0.22 per watt for finished cells
- $0.38 per watt for a complete module
A Minimum Import Price is a legal floor, not a tariff rate. Importers must document that the first U.S. sale is at or above it, or the shipment is out of compliance. It stacks with the proclamation's 15% ad valorem tariff (10% for UK-origin goods) plus volumetric duties tied to the MIP framework itself.
That $0.38/W number is the one that reaches your quote directly. A residential system in the 8–10 kW range uses roughly 8,000–10,000 watts of module capacity. Do the floor math, and $0.38/W alone adds a real, fixed dollar amount to the panel cost before installation labor, racking, inverters, or a single markup dollar gets added on top.
How This Is Different From "Another Tariff Went Up"
Solar buyers have heard "new tariffs" before: AD/CVD cases, Section 201 safeguard tariffs, the 2025 country-specific rates. Those all worked by taxing a percentage of a declared value, which manufacturers had at least some room to absorb, discount around, or shift between suppliers to soften. A minimum import price removes that flexibility. If a module is built from imported cells, there is no legal price below $0.38/W, full stop. It doesn't matter how efficient the assembler's factory is or how much it wants to compete on price to win your business.
*Rate is 10% for UK-origin goods, with separately negotiated rates for a handful of other trading partners.
Our read: this is less a revenue tool than a wall. The U.S. imported roughly 32 GW of modules last year, yet domestic assemblers source over 90% of cells abroad (3.2 GW of U.S. capacity against 65.5 GW of assembly). That's the gap the floor now makes unprofitable to exploit.
Can the Floor Go Higher Before December?
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Made in the USA: Top 5 solar brandsYes, and this is the detail we'd flag hardest to anyone waiting out the 120-day gap between the August 6 signing and the December 4 effective date hoping for a better number. The proclamation gives the Secretary of Commerce standing authority to adjust the minimum import prices "from time to time to reflect market conditions or other factors affecting the fair market value" of these products. Nothing in that language requires waiting until the rule takes effect to use it.
Our take: that clause only runs one way in practice. It exists to let Commerce raise the floor if domestic manufacturers make the case that $0.38/W isn't generating enough margin to justify building out more U.S. cell capacity — not to lower it if buyers push back on cost. If you're quoting a project now on the assumption that today's number is the worst-case number, we wouldn't make that assumption.
The proclamation does include monitoring and anti-stockpiling provisions aimed at importers who might try to rush extra inventory in before December 4, and it appears to preserve pricing for imports already locked into fixed-price contracts signed before August 6. Neither of those helps a homeowner getting a quote today.
What Should You Ask Your Installer Right Now?
If you're mid-decision on a system, get your installer to confirm in writing whether your equipment is being sourced and invoiced before December 4, and ask directly whether the modules you're being quoted use imported or domestic cells. That single question tells you how exposed your price is to this rule, and to whatever Commerce decides to do with it before the effective date arrives.
Does the Price Floor Change When You Should Buy Solar?
It sharpens a decision that was already on the table. We've covered the tariff situation before, and the short version was that solar still penciled out even as tariffs climbed. A hard, dollar-denominated price floor changes that math somewhat, because it removes the scenario where competition among importers quietly erodes a tariff's bite over time. Once the floor is in effect, $0.38/W plus 15% is close to a permanent baseline, not a temporary spike that undercutting can chip away at.
None of that means panels bought today are risk-free from cost increases: installation labor, financing rates, and local permitting costs all move independently of any of this. If you want to sidestep the floor entirely, American-made panels built end-to-end from domestic cells aren't subject to it, though they're still a small slice of what's available. For everything else, the fixed number now sitting under every imported module isn't going anywhere.
Solar panel costs in 2026: Prices & savingsWhat to Do Right Now
- Verify whether your quoted equipment will be invoiced and entered for consumption before December 4, 2026, or after.
- Ask your installer directly whether the modules in your quote use imported or domestic solar cells.
- Lock pricing in writing now if you're already decided on a system — a signed quote doesn't stop a manufacturer's cost from moving, but it protects you from your installer re-pricing around it later.
- Flag any quote that jumps sharply after December 4 and ask for the breakdown: under this rule, at least part of that increase should be traceable to a specific, published number.
- Pause only if you were already planning to wait regardless of tariffs — waiting specifically to "see if this settles down" ignores that the mechanism here only has room to move prices up, not down.
