For decades, California families could pass property to their children without triggering a reassessment, keeping the low Prop 13 tax base in the family. Proposition 19, effective February 16, 2021, dramatically narrowed that benefit. If your estate plan assumed the old rules, it may now produce a large, unexpected tax increase on the next generation.
What Prop 19 changed
Before Prop 19, a parent could transfer their primary residence to a child at any value without reassessment, plus up to $1 million of assessed value in other property (rentals, vacation homes, commercial). Prop 19 eliminated the exclusion for non-primary-residence property entirely, and tightened the rule for the family home.
Old rule vs. new rule
| Before Prop 19 | Under Prop 19 | |
|---|---|---|
| Family home | Excluded from reassessment at any value | Excluded only if the child makes it their own primary residence — and only up to a value cap |
| Rentals / other property | Up to $1M assessed value excluded | No exclusion — reassessed to market value |
| Primary-residence requirement | None for the transferring parent's home | Child must move in and claim the homeowner's exemption within one year |
The primary-residence requirement and the value cap
Under Prop 19, an inherited family home keeps its parent's low tax base only if the child (or grandchild) uses it as their own primary residence and files for the homeowner's or disabled-veterans' exemption, generally within one year of the transfer. Even then, if the home's market value at transfer exceeds the parent's factored base-year value by more than the inflation-adjusted $1 million exclusion, the excess is added to the assessed value — so very high-value homes get a partial step-up even when the child moves in.
The most common Prop 19 trap: inheriting a parent's home and keeping it as a rental or second home. That no longer qualifies for any exclusion — the property is reassessed to full market value, often multiplying the tax bill. If the child doesn't move in and file within the one-year window, the family base year value is lost.
What this means for planning
- If keeping a property in the family matters, plan around who will actually live in it — only an owner-occupant child preserves the base value.
- Rental and investment property will be reassessed on transfer; model the new tax before assuming heirs can hold it.
- The one-year primary-residence and exemption-filing window is strict — calendar it immediately after any transfer.
- Prop 19 also has a taxpayer-friendly side: homeowners 55+, severely disabled, or wildfire/disaster victims can transfer their base year value to a replacement home anywhere in California, up to three times.
Prop 19 planning has real estate, tax, and legal dimensions — model the reassessment before you transfer, and consult a qualified estate-planning attorney or CPA for your specific situation.
Sources & currency: Proposition 19's parent-child exclusion changes (effective February 16, 2021), the primary-residence and one-year filing requirements, the inflation-adjusted $1 million value cap, and the base-year transfer provisions were reviewed against the California State Board of Equalization and county assessor guidance as of July 2026. The exclusion cap is adjusted for inflation — confirm the current figure and your filing deadline with your county assessor. This is general information, not legal or tax advice.