For two decades, a single number shaped a $15 billion American industry: 30%. On January 1, 2026, that number hit zero, with no warning ramp, no soft landing. This is the story of what happens when the incentive that built the rooftop solar boom disappears overnight, and who's left to pick up the bill.
Here's how it worked: buy a solar system outright, and Section 25D handed you back 30% of the cost, directly, on your tax return. That mechanism (simple, generous, homeowner facing) is what turned rooftop solar from a niche purchase into a mainstream one. As of this year, that path is closed. Only one door remains open: systems owned by a third party, meaning leases and power purchase agreements, can still route a 30% credit through Section 48E, but the homeowner never touches it directly.
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This wasn't supposed to happen this way. The original law scheduled a slow, predictable taper: 30%, then 26%, then 22%, giving the industry a decade to adjust.
The One Big Beautiful Bill Act, signed July 4, 2025, tore up that schedule. Section 25D was repealed outright, effective the very next New Year's Eve, a cliff, not a curve. As Heatmap News put it, the industry didn't get a phase down; it got a funeral.
The reaction was immediate and national. Installers who'd spent months front loading contracts to beat the deadline watched bookings evaporate on January 1.
The math no longer works the way it used to. American rooftop solar was already expensive by global standards. At $2.58 per watt, homeowners here pay roughly two and a half times what Australians do for the same system. Strip out the 30% credit, and that gap becomes the whole ballgame.
This is bigger than one tax season. BloombergNEF's own analysts, cited by Canary Media, project that 2026 installations will fall to their lowest level since 2020, and that it could take more than a decade for the industry to simply match the record set in 2023 again.
That 2023 peak, notably, was itself a policy artifact, juiced by IRA incentives and Californians racing to install before the state slashed its own compensation rules. Solar's growth curve, it turns out, tracks Washington's mood as closely as it tracks the sun.
Shape is illustrative, built to match the trend BloombergNEF describes. Exact year by year figures have not been published.
Nationally, the story is contraction, but California's market is set to rebound 17% this year, and Florida, the No. 2 rooftop solar state, is projected to grow a staggering 62%.
Why the divergence? Ample sun, high existing awareness, and utility bills rising fast enough to make solar worth it even without Uncle Sam's help. Everywhere else, the incentive gap is doing exactly what economists predicted it would. Hover any tile for more detail.
The credit didn't just expire. It reset the entire calculus of who can afford to go solar in America.
The long term scar is structural: a decade long incentive that shaped consumer behavior, installer business models, and household budgeting is simply gone for anyone who wants to own their system outright. Senate Minority Leader Chuck Schumer has told Heatmap News that Democrats will fight to bring the credits back, but for now, that's a promise, not a policy.
In the meantime, the market is adapting at the margins: leases and PPAs are absorbing demand the ownership model can no longer serve, states like California and Florida are proving local conditions can outrun federal retreat, and a wave of cheap, renter friendly balcony solar is opening a smaller but genuinely new front door into clean energy.