09/04/2026
Does adding solar raise what you're assessed on in California? For years the answer's been no. That ends January 1, 2027.
Section 73 of the Revenue and Taxation Code keeps a solar system's value out of your assessed value. Add a pool, add square footage, the assessor adds that value. Solar has been the one exception, for lien dates from the 1999-2000 fiscal year through 2025-26 (Board of Equalization, Letter To Assessors 2024/031, August 26, 2024).
It always had an end date. This year's bill to extend it passed its policy committee 7 to 0 in April, then died in Appropriations on May 14. No floor vote. Nobody voted it down either. It just stopped moving, which is usually how these things go when the budget is tight. So there was never a headline.
Here's what trips people up. The test is completion, not contract. A system still under construction on January 1, 2027 isn't excludable. One finished before then may be. Sign in December, finish in February, and you're on the wrong side of it.
Now the part nobody can answer for you. The Board of Equalization didn't define what "completed" means here. It points assessors to Property Tax Rules 463 and 463.500 and leaves it at that. So if someone tells you that you need permission to operate by December 31, they're guessing. Call your county assessor and ask what they actually key off.
If you already have a qualifying system, you keep the exclusion until the property changes hands. Your buyer doesn't inherit it.
The federal 30 percent residential clean energy credit is already gone, for expenditures made after December 31, 2025 (IRS Fact Sheet FS-2025-05, August 21, 2025).
One more thing worth saying out loud. If solar didn't pencil for you before, a tax deadline isn't a reason to buy it.
Swipe for the checklist to take to your tax professional.
Educational only, not tax advice. Talk to a qualified tax professional about your own situation.
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