Solar policy and pricing
2026 Solar Tariffs: What They Actually Cost, and How to Plan Your Project Around Them
New federal tariffs on polysilicon-based solar components take effect December 4, 2026, and they apply no matter which country your equipment comes from. This isn't a reason to panic-buy — it's one input into a decision you're already making. Here's what changed, roughly what it does to equipment costs, and how to factor it into a system you're already planning.
The Short Version
- What changed: A 15% tariff plus minimum import prices (MIPs) now apply to any imported solar wafer, cell, or panel that contains polysilicon, regardless of country of origin.
- When: Takes effect December 4, 2026 (120 days after the August 6, 2026 proclamation). Equipment bought and installed before then isn't subject to it.
- The cost direction: Up. The new floor for finished imported panels is 38¢/W. Many quality modules have recently landed in the mid-20s ¢/W range, so hitting that floor is roughly a +50% jump at the panel level (about +13¢/W), plus a separate 15% tariff where it applies.
- The catch: "Made in USA" doesn't mean exempt. Over 90% of cells inside US-assembled panels are still imported, so the tariff can still reach them.
- What to do now: Don't rush a purchase for its own sake. A system still has to be sized, permitted, and utility-approved to be buildable. The deadline is a timing input, not a reason to skip the parts that make a project work.
What Changed on December 4, 2026
Two things now apply to any imported solar wafer, cell, or finished panel that contains polysilicon:
- A 15% tariff — applied at each stage of the supply chain where polysilicon shows up in the finished product, from raw wafers to completed modules.
- Minimum import prices (MIPs) — hard price floors that imported equipment legally cannot fall below at each stage.
This isn't a tariff aimed at one country. According to the presidential proclamation signed August 6, 2026, the rule applies to polysilicon and its derivative products regardless of country of origin. Panels assembled in India, Southeast Asia, or anywhere else are covered the same as panels tied to Chinese supply chains. Because the rule follows the material, not the country label on the box, it reaches nearly every finished solar panel sold in the U.S., including panels assembled domestically from imported cells or wafers.
One exception: imports of polysilicon by itself, not yet processed into a wafer, cell, or panel, are not subject to the 15% tariff. The tariff targets finished and semi-finished components, not the raw material feeding U.S. factories.
When it takes effect: December 4, 2026 — 120 days after the proclamation was signed. Equipment purchased and installed before that date isn't subject to the new tariff or price floors.
Why These Tariffs Exist
The tariffs came out of a Section 232 national security investigation into whether the U.S. is too dependent on foreign polysilicon, the base material for both solar panels and semiconductors. The Department of Commerce opened the investigation in July 2025 and reviewed roughly 50 public comments before issuing its findings.
The White House framed it as protecting a material it considers essential to national security, citing polysilicon's role in defense systems such as radar, electronic warfare, and missile guidance, and arguing the U.S. can't scale domestic chip or solar production without a secure domestic polysilicon supply. Domestic solar manufacturers have pushed for this kind of protection for years.
The Real Dollar-and-Percent Impact
Here's the part most coverage skips: what this actually does to a number on a quote.
At the panel level, the new floor for finished imported panels is 38¢ per watt — a price no imported panel can legally fall below. Many quality imported modules have recently been landing in the mid-20s ¢/W range, so the floor is a meaningful step up:
| Recent import landed price | New floor | Increase |
|---|---|---|
| ~25¢/W (common recent range) | 38¢/W | +~50% |
| Southeast Asia ~27¢/W | 38¢/W | +~40% |
| US-assembled ~31¢/W | 38¢/W | +~23% |
On top of that floor sits the separate 15% tariff on imported polysilicon-containing components — in practice the price floor is often the binding constraint.
Translated to a real system: on a typical 8 kW (8,000-watt) residential system, a panel moving from ~25¢/W to the 38¢/W floor is roughly +$1,000 at the panel line (8,000 W × ~13¢/W); a larger 10 kW system runs closer to +$1,300. That's the panel portion only — total installed cost also includes inverters, racking, labor, permitting, and interconnection, so as a share of the whole project the impact is smaller.
Why "Made in USA" Isn't Automatically Cheaper
The common assumption is that this is a tariff on Chinese panels. It isn't. The rule follows the polysilicon, not the country of manufacture.
U.S. domestic cell manufacturing capacity currently covers only a small share of what U.S. module assemblers need, so over 90% of the cells used in US-assembled panels are still imported (per an industry analysis citing SEIA data). A panel assembled in a U.S. factory can still be built from imported, tariffed cells.
So "domestic assembly" and "tariff-exempt" are not the same thing. If you're evaluating equipment, ask where the cells and wafers came from, not just where the panel was put together.
Does the Deadline Change Your Timeline?
If your project is far enough along to realistically close before December 4, 2026, buying ahead of the deadline avoids the new tariff and price floor on imported components. The rules apply going forward, not retroactively.
But a rushed purchase isn't automatically the right move. A system still needs to be designed around your actual usage, roof, utility interconnection requirements, and local permitting. Buying equipment fast without a system design, permit-ready plans, and a clear utility approval path is how projects end up with parts that don't fit or stall at inspection. The tariff date is one input into your planning, not a reason to skip the steps that make the project buildable.
What a Tariff-Proof System Plan Looks Like
The best protection against price movement isn't timing the market — it's a system specified correctly the first time, so you're not re-buying parts later at higher import costs. Before you lock in equipment or a timeline, make sure you have:
- Recent electric bills or a usage estimate
- Your roof's condition, orientation, and available space (or ground-mount site)
- Planned future loads (EV, heat pump, workshop)
- Your utility's interconnection and net metering rules
- Your local permitting requirements
A system designed around these holds up regardless of what equipment prices do between now and December 4.
How Unbound Solar Helps
Unbound Solar helps homeowners get a system actually designed for their home, not just a stack of panels off a price list. That distinction matters more when equipment costs are shifting: a system sized and specified correctly the first time avoids re-buying parts later, which is more expensive once replacement components carry higher import costs.
- System designBuilt around your actual usage, roof, and goals — not a generic kit size.
- Permit-ready plansDrawings prepared for your local jurisdiction, correct the first time.
- Utility interconnectionThe paperwork and technical questions for your permission to operate.
- Install guidanceClear direction on what you can install yourself and where a licensed electrician is required.
Start With a Solar Estimate
Questions people actually ask
Straight answers, sourced from real searches.
No. The 15% tariff and minimum import prices apply to any solar wafer, cell, or panel containing polysilicon, regardless of country of origin, per the August 6, 2026 proclamation. A panel assembled in India, Southeast Asia, or even the U.S. using imported cells is covered the same way.
December 4, 2026 — 120 days after the proclamation was signed on August 6, 2026. Equipment purchased and installed before that date isn't subject to the new tariff or price floor.
For imported panels, the new 38¢/W floor is roughly a 50% increase over recent landed pricing (many modules have been landing in the mid-20s ¢/W), plus a 15% tariff. On a typical 8 kW system that's on the order of ~$1,000 at the panel line — meaningful, but one equipment line item, not a 50% jump in your total project cost, which also includes inverters, racking, labor, and permitting.
A minimum import price is a price floor (currently 38¢/W for finished panels) that imported equipment legally cannot fall below, on top of the separate 15% tariff. Together they prevent foreign panels from underpricing domestic ones, per the Section 232 investigation results.
Not necessarily. Over 90% of the cells used in US-assembled modules are still imported, so a domestically-assembled panel can still be built from imported, tariffed cells.
If your project is already far enough along to realistically close before then, buying ahead avoids the new tariff and floor on imported components. But a system still needs to be designed, permitted, and utility-approved. A rushed purchase without that groundwork usually causes more problems than it solves.
Yes. MIP adjustments are structured to move upward only, and the Secretary of Commerce can raise them based on domestic-manufacturer feedback without waiting a full year of market data.