If you've shopped for solar, you've heard about "the tax credit." But the federal Investment Tax Credit is really two different things — one for homeowners who buy a system, and one for businesses that invest in one — and the gap between them matters more in 2026 than it ever has. Here's a plain-English breakdown of where it stands and how a Southern California home or business might still benefit.
What the ITC is, in one sentence
The Investment Tax Credit (ITC) is a federal credit that lets the owner of a qualifying solar (and often battery) system claim a percentage of its cost against their federal taxes. The key word is owner — the credit follows whoever owns the equipment, which is exactly why how you pay for solar changes who gets the benefit.
The big shift: residential vs. business
For years, homeowners who purchased a system could claim the residential version of the credit (the Residential Clean Energy Credit). Recent federal legislation moved up the end date for that homeowner-purchase credit, so for systems placed in service after the 2025 window it is no longer the reliable 30% it once was. The exact treatment depends on your situation and timing — which is why you should never assume an old brochure number.
The separate business/commercial Investment Tax Credit, claimed by companies that own income-producing solar, follows a different track with its own phase-down schedule and timing rules. That credit is still part of the conversation for businesses and for third-party system owners — and that distinction is the whole story for homeowners in 2026.
How a homeowner can still benefit
Here's the nuance most homeowners miss: even where the purchase-side credit has tightened, the business-side credit can still reach you indirectly. With a third-party-owned system — a lease, a power purchase agreement (PPA), or a program structured around partner ownership — the provider owns the equipment, may be able to capture available business incentives, and can pass a share of that value back to you through a lower rate or lower upfront cost.
That's a major reason prepaid PPAs and partner-financed programs have stayed attractive in California even as the homeowner-purchase credit changed. The trade-off is ownership: with these structures a third party owns the system for some period, which affects buyout, transfer, and warranty terms. We compare all of these paths — cash, loan, PPA, and partner programs — in our solar financing guide.
What it means for Southern California businesses
If you own a business, the commercial ITC may apply to a solar or solar-plus-storage system on your facility, and certain bonus "adders" (for things like domestic-content equipment or qualifying locations) can increase the credit in some cases. Because the business credit is tied to timing and to when a project begins, businesses weighing a 2026 or 2027 installation often look at safe harbor rules to lock in the credit available today. We design and permit commercial solar and storage across the region with that timing in mind.
California still has its own value drivers
Federal credits are only part of the math. In Southern California, the steady engine of solar savings is avoiding ever-rising Southern California Edison (SCE), LADWP, and PG&E rates — especially the 4–9 p.m. time-of-use peak — and, under NEM 3.0, getting more value out of your own production with a battery. For high-desert homes in Lancaster and Palmdale running AC hard all summer, that evening peak is where storage earns its keep. Those savings exist regardless of how the federal credit evolves, and the actual amount depends on your usage and rate plan.
Bottom line
Don't let a salesperson quote you a credit you may not qualify for — and don't let credit uncertainty freeze a decision that pencils out on utility savings alone. Whether the ITC applies to you, in what form, and for how much depends on your tax situation, who owns the system, and when it's placed in service, so confirm the specifics with a tax advisor and with ACS before you sign. Ask any installer to show your numbers two ways: with and without the federal benefit. ACS has designed solar and battery systems across Southern California — the Antelope Valley, Los Angeles, and Ventura counties — since 1983, and that's how we build every estimate. Request a free estimate to see what makes sense for your home or business.