Two different changes, easy to conflate
Proposition 19, passed by voters in 2020, made two separate changes to how California reassesses property for tax purposes. This piece covers the first — family transfers — which is the one that catches long-time SGV homeowners and their heirs off guard. (The second lets homeowners 55+, severely disabled people, and disaster victims carry their existing tax base to a replacement home; that's a separate topic.)
What changed for parent-child transfers, effective February 16, 2021
Before Prop 19, a parent could transfer a home — or a rental property, or a vacation property — to a child without triggering reassessment, largely regardless of what the child did with it. Prop 19 narrowed that significantly:
- Only a family home (or family farm) qualifies for the exclusion at all. Rental property, vacation homes, and other investment property no longer get any exclusion — they're reassessed to current market value on transfer, full stop.
- The child (or grandchild, in a grandparent-to-grandchild transfer) has to actually move into the home as their principal residence within one year of the transfer and file for the homeowners' exemption. Keeping the home as a rental or a second home means losing the tax break.
- Even when the exclusion applies, it's now capped, not unlimited. The cap is the parent's factored base year value plus an indexed amount — for transfers between February 16, 2025 and February 15, 2027, that indexed add-on is $1,044,586 (source: California State Board of Equalization, Letter to Assessors 2025/009). The BOE adjusts this figure every other year off a California house-price index; the next adjustment is due around March 2027 — re-verify before quoting a figure after that date. If the home's market value at transfer exceeds the parent's base value plus that cap, the excess amount is added to the new taxable value.
What this replaced
Prop 19 replaced the older Prop 58 (1986) parent-child exclusion and Prop 193 (1996) grandparent-grandchild exclusion, both of which were broader — no occupancy requirement, and (for Prop 58) no dollar cap on the excluded value.
Both sides of it
For a family inheriting a long-held SGV home, the practical effect is binary: move in within a year and the low property tax basis mostly carries forward (subject to the cap above); keep it as a rental or a second home, and the county reassesses it to current market value — which, on a property held for decades, can multiply the annual tax bill. For the state and county tax base, this is the point of Prop 19: it closed what critics called a loophole where inherited rental and vacation property kept a decades-old, far-below-market tax basis indefinitely, at the cost of county-wide revenue.
What this doesn't cover
This piece is about the parent-child and grandparent-grandchild transfer rules only. Prop 19's separate base-year-value-transfer provision — letting a homeowner 55 or older, a severely disabled person, or a wildfire/disaster victim move their tax basis to a new home — works differently and has its own rules; don't apply the family-transfer cap or the one-year occupancy rule to that situation.