Guide
Solar tax credit California: the 2026 incentives that are left
Updated
California, the largest US rooftop solar market, has never offered a state solar income tax credit. Here is what exists in 2026, and the deadline in the property tax rules.
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- The federal residential clean energy credit (Internal Revenue Code Section 25D) is not applied. Per the IRS page, it "equals 30% of the costs of new, qualified clean energy property" installed "anytime from 2022 through December 31, 2025".
- It also states "the credit is not available for any property placed in service after December 31, 2025" (irs.gov). The page was last reviewed July 4, 2026; we read it again on our updated date. Confirm your own position with a tax professional, not with a salesperson.
- The default electricity rate of 33.25 cents per kWh is the California residential average for May 2026 (EIA, Electric Power Monthly, Table 5.6.A). Californian tariffs are tiered and time-of-use, so your marginal rate at 6pm can be far above that average. It is an input: change it.
- Sizing assumes roughly 1,600 kWh per kW per year for an unshaded south-facing California roof. It is scaled by 0.85 for an east or west roof and 0.7 for a shaded or north-facing one.
- These are working estimates, not a figure from an official source we can cite today. Treat the suggested size as a starting point, and ask your installer for a modeled production figure for your address.
- Price per watt is your input. The $3.30 default is a typical 2026 California quote and moves with roof type, panel and inverter tier, main panel upgrades, permitting jurisdiction and financing. We publish no California market average because no official source we can cite publishes one.
- Battery storage at a default $14,000 installed is a typical 2026 quote for a home battery in the 10-15 kWh class, again an input rather than a published rate.
- Nothing here estimates savings. Since April 15, 2023, new California interconnection applicants take service on the net billing tariff. Exports are credited "at a rate reflecting the value of this generation to the grid", not at retail rates (CPUC). See how net billing works.
- California has no state income tax credit for residential solar. The property tax treatment under Revenue and Taxation Code section 73 is time-limited and is covered in our incentives guide.
There is no California solar income tax credit
This is the first thing to get straight, because plenty of pages imply otherwise by listing federal and state benefits together. California offers no residential solar income tax credit. If a quote shows a "California state credit" line, ask for the statute.
Property tax: real, valuable, and running out
Revenue and Taxation Code section 73 excludes an active solar energy system from the meaning of "newly constructed", so adding one does not trigger a reassessment of your home.
For electricity production, the section's definition includes "storage devices, power conditioning equipment, transfer equipment, and parts related to the functioning of those items" (leginfo.legislature.ca.gov).
The section is written with an end date. The current text was amended by Stats. 2025, Ch. 328 (SB 710), effective January 1, 2026.
- Subdivision (i)
- "this section shall remain in effect only until January 1, 2027". Then: "active energy solar systems that qualify for an exclusion under this section prior to January 1, 2027, shall continue to be excluded on and after January 1, 2027, until there is a subsequent change in ownership".
- Subdivision (f)
- The exclusion "shall remain in effect only until there is a subsequent change in ownership".
- Subdivision (g)
- The section "applies to property tax lien dates for the 1999-2000 fiscal year to the 2025-26 fiscal year, inclusive".
This is technical, it has been amended repeatedly, and it decides whether your property is reassessed. Read the section yourself and confirm your own position with your county assessor before relying on it. Nothing here is tax advice.
Storage: the CPUC program
California's storage incentive is the Self-Generation Incentive Program, administered under the California Public Utilities Commission (cpuc.ca.gov). Incentive levels, budget categories and eligibility rules change yearly. Some categories target specific groups rather than the general market, so we quote no figure.
Ask an installer which category they are applying for. Check the current terms on the CPUC page before treating any incentive as money in hand.
The incentive that is not called one
California's real advantage is the price of the electricity you stop buying. It averaged 33.25 cents per kWh in May 2026 (EIA, Electric Power Monthly, Table 5.6.A). That is more than twice the Arizona, Florida and Texas averages for the same month.
So each kilowatt-hour avoided at a peak time is worth far more here than almost anywhere else. That is precisely why net billing pushed the design toward self-consumption. See how net billing works.
A short checklist
- Ask for the statute behind any state credit line on a quote. There is no California residential solar income tax credit.
- Ask your county assessor how section 73 applies to your installation date before assuming no reassessment.
- Ask which SGIP category, if any, the installer is applying under, and whether the incentive is paid to you or to them.
- Ask what tariff and rate schedule you will be interconnected on, which affects your savings more than any incentive.