California's Solar Property-Tax Exclusion Ends January 2027

Adding solar increases a home's value. Normally, home improvements that add value trigger a property-tax reassessment. California's active solar energy system exclusion — on the books since 1980 — makes solar the exception: systems installed before the sunset date are excluded from reassessment for as long as the original owner holds the property.

That exclusion is currently scheduled to sunset on January 1, 2027. Systems installed and completed before then keep the exclusion; projects that land after are subject to whatever rules exist at that time.

What it's worth

The math is straightforward: if a system adds, say, $25,000 of assessed value, the exclusion avoids roughly $250–300 per year in property tax at typical California rates — every year, indefinitely. Over a 25-year system life, that quietly rivals some of the flashier incentives that get more attention.

The practical takeaway

Solar projects have real lead times: design, permitting, HOA review, installation, inspection, and utility interconnection typically span 6–11 weeks end to end. A project started in late 2026 could miss the deadline through no fault of the homeowner. If the exclusion matters to your math, the safe move is to have your system operating well before the calendar turns. As always: we're installers, not tax advisors — confirm specifics with a tax professional.