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The federal solar tax credit ended: what it means for a 2026 Oakland install

Last verified: November 11, 2026 · Written and checked by the DuloCore research team

The federal solar tax credit does not apply to an Oakland system installed in 2026, and many quotes and older articles still get this wrong. This page explains what the IRS says, what happened to systems paid for in 2025, and the California property tax rule that still runs until January 1, 2027. For what is still available, start from the Oakland incentives overview.

What the IRS says

The Residential Clean Energy Credit (Internal Revenue Code section 25D) was worth 30% of the cost of qualified property installed from 2022 through 2025, and from 2023 it also covered home batteries of at least 3 kWh (IRS). Public Law 119-21, signed July 4, 2025, ended it early. The IRS fact sheet states that "the credit will not be allowed for any expenditures made after December 31, 2025" (IRS FS-2025-05).

The timing rule is the part most people miss. An expense "is treated as made when the original installation of the item is completed." So if your installer finished in January 2026, the expense counts as a 2026 expense, even if you paid in full in December 2025. The IRS asks this exact question in its FAQ, whether paying on or before December 31, 2025 is enough, and answers "No."

If your system was completed in 2025, you claim the credit with Form 5695 on your 2025 return (IRS). Batteries are treated the same way: a battery installed in 2026 gets no federal credit, whether or not it is paired with solar.

What this means for a 2026 quote

California property tax: the solar exclusion ends January 1, 2027

California does not reassess your home because you added solar. Revenue and Taxation Code section 73 excludes an active solar energy system from "new construction," so the system "is not assessed"; the Board of Equalization calls it an exclusion, not an exemption (BOE). It covers systems that make electricity or heat water, but not pool heaters or hot tub heaters.

The BOE page says the statute "is now scheduled to sunset on January 1, 2027." The BOE's letter to county assessors explains what that means in practice: new construction completed on any day before January 1, 2027 may qualify, but construction in progress added during 2026 is not excluded unless it is completed before that date (BOE Letter to Assessors 2024/031). Once excluded, the system stays excluded until the property changes ownership.

For an Oakland homeowner signing now, that means the system must be finished, not just started, by December 31, 2026, which is about seven weeks away. We found no extension on the BOE page as of today. If timing is tight, ask your installer for a realistic completion date and ask the Alameda County Assessor's office how it records completion. Permit timing matters here, so see the Oakland permit steps.

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