California Solar Property Tax Changes: What East Bay Homeowners Should Know Before 2027
California Solar Property Taxes: Why Completing Your Project in 2026 May Matter
August 2026
California’s property-tax treatment of solar energy systems may change beginning in 2027. Although important details are still being determined, homeowners and businesses considering solar should understand why completing their projects before the end of 2026 may provide valuable protection.
What happened?
Two proposed California bills addressing solar property taxes did not advance this year:
AB 2389 would have exempted solar systems up to 2 megawatts from property tax.
SB 1329 would have clarified that counties must deduct the applicable federal Investment Tax Credit when calculating a solar system’s taxable value.
With both proposals no longer moving forward, decisions about how solar systems will be valued may largely be left to individual counties and the California State Board of Equalization.
Industry organizations, including the California Solar & Storage Association (CALSSA), are continuing to advocate for fair and consistent treatment. However, the final assessment methods have not yet been established.
What does this mean for existing solar systems?
According to CALSSA’s August 11, 2026 update, systems already operating—or installed and finalized under a building permit by the end of 2026—should not receive a supplemental property-tax assessment while the current owner continues to own the property.
The property-tax treatment may be reconsidered when the property is sold.
This makes project timing particularly important. Customers hoping to qualify under the existing protection should allow enough time for system design, permitting, installation, inspection and final approval before December 31, 2026.
How much could the future tax be?
The answer is not yet clear because counties have not finalized how solar systems will be valued.
For customer-owned residential systems, CALSSA is advocating for a comparable-sales approach based on the value that solar adds to a home—not simply the customer’s total installation price.
CALSSA provided an illustrative example in which solar might add approximately $10,000 to a home’s assessed value. At an average property-tax rate of about 1.1%, that could equal approximately $110 per year, or potentially around $70 per year if depreciation is considered.
These figures are preliminary examples, not guaranteed tax amounts. If counties instead base the assessment on the system’s purchase or construction cost, the annual tax could be higher. It also remains uncertain whether the applicable federal tax credit will be deducted before determining the taxable value.
What about solar leases and PPAs?
Third-party-owned systems—including solar leases and Power Purchase Agreements—are expected to be included in the property-tax rules.
In these arrangements, the system owner or provider may be responsible for the property tax. However, that cost could ultimately be reflected in the lease or PPA pricing offered to the customer.
For larger commercial and third-party-owned systems, assessments may be based on the total construction cost. Whether the applicable federal Investment Tax Credit will reduce that taxable basis remains unresolved.
Ally Electric & Solar’s perspective
At Ally Electric & Solar, we believe customers deserve clear information before making a long-term energy decision. There is still significant uncertainty, and we do not want homeowners or businesses to make decisions based on fear or incomplete information.
However, customers already planning to install solar should be aware that completing the project in 2026 may offer an important property-tax advantage. Waiting until 2027 could expose a new system to county assessment rules that have not yet been finalized.
Solar projects require time for:
System design and engineering
Building-permit review
Equipment procurement
Installation
Inspection and permit finalization
Utility interconnection approval
If your goal is to have your solar installation completed and finalized before the end of 2026, we recommend beginning the process as soon as possible. Starting early does not guarantee year-end completion, but it provides the best opportunity to meet the deadline.
Ally Electric & Solar will continue monitoring guidance from CALSSA, the California State Board of Equalization and local county assessors. We will share updates as more information becomes available.
Considering solar in 2026? Contact Ally Electric & Solar to discuss your property, expected energy usage, available roof space and the realistic timeline for completing your project before year-end.
This article is for general informational purposes only and is based on industry guidance available as of August 2026. Property-tax treatment may vary by county and individual circumstances. Ally Electric & Solar does not provide tax or legal advice. Customers should consult a qualified tax professional or their county assessor for guidance specific to their property.