Selling Solar Without the 25D Tax Credit

What Actually Changed on January 1, 2026

The One Big Beautiful Bill Act (OBBBA), signed July 4, 2025, ended the Section 25D residential clean-energy tax credit for any system installed on or after January 1, 2026. There is no phase-down window and no partial credit for systems that missed the deadline. It is a cliff, not a ramp.

For twenty years, 25D was the anchor of most retail solar pitches: buy the system, claim 30% back on your federal return. That anchor is gone for any homeowner buying with cash or a loan starting this year.

Why Cash and Loan Deals Lost Their Best Argument

A homeowner who owns their system outright, whether paid in cash or financed with a loan, gets zero federal credit on a system installed in 2026. That is not a smaller credit or a slower one. It is nothing. The "30% off" line that closed a large share of retail deals for two decades is simply not true anymore for these two payment paths, and a rep who still uses it is giving a homeowner inaccurate information they will eventually find out about, usually from their accountant.

The One Path That Still Carries the Credit

Section 48E is the remaining route to a 30%-equivalent credit, but it works differently than 25D did. It can only be claimed by whoever owns the solar system, which in a residential deal means a third-party-ownership (TPO) provider under a lease or power purchase agreement, not the homeowner. A cash or loan buyer does not qualify for 48E for the same reason they do not qualify for 25D: they own the system, and 48E was not written for owner-occupants.

What the 2025 Rush Actually Cost the Market

Customer acquisition cost hit a five-year low of $0.60 per watt in 2025. That was not a sign of a healthy market, it was a demand-rush effect: the looming 25D cliff pulled buyers forward, and installers coasted on inbound interest while cutting marketing spend. That cushion is gone in 2026. Wood Mackenzie projects CAC spiking 40% to $0.84 per watt this year as installers compete harder for a shrinking pool of buyers without the rush effect propping up inbound volume.

That is the real backdrop for this guide: 2026 is not a year to run the old script louder, it is a year where fewer, better-qualified appointments matter more because each one costs more to generate than it did twelve months ago.

Reframing the Pitch for a Credit-Free System

The practical fix is simple to state and requires discipline to run consistently. Stop leading with "the credit" for any homeowner planning to pay cash or finance a loan. Lead instead with monthly payment, lifetime energy savings, and, where it fits, the third-party-ownership path that still carries incentive value. Ask about financing intent early in qualification, before the appointment is even booked, so a rep does not spend forty-five minutes building a pitch around a credit that does not apply to the deal in front of them.

An appointment that arrives already knowing the homeowner's financing lean is a better use of a rep's time than one that has to discover it mid-pitch.

Sources

The external data in this guide draws on the sources below. Figures described in the text as estimates or industry triangulations are directional and are not attributed to a single dataset.

• SEIA, clean energy provisions of the One Big Beautiful Bill
• Kirkland & Ellis, OBBBA changes to green energy tax credits
• NuWatt Energy, solar tax credit 2026
• Wood Mackenzie, US residential solar CAC set to spike 40% in 2026

FAQ