Prop 19 Parent-to-Child Transfer: Mortgage and Property Tax Implications

I’m Michael DiVita — DRE #01372066 | NMLS #241655, DiVita Home Finance (DRE #01818285 | NMLS #323700), Tiburon, CA. I’ve been in California mortgage lending since 2000 and founded DiVita Home Finance in 2007. Inherited property refinances and sibling buyout loans are situations I handle regularly — especially in Marin and Sonoma County where the equity and property tax stakes are enormous. Call (800) 239-1103.

California Proposition 19 gave with one hand and took with the other. While it expanded portability for older homeowners moving to new properties, it substantially tightened the rules around parent-to-child property tax transfers — a change with enormous implications for estate planning and mortgage strategy in California families.

What Changed for Parent-to-Child Transfers Under Prop 19

Under the old rules (Prop 58), children who inherited a California property from their parents could claim the parent’s low Prop 13 assessed value for any property — including investment properties, vacation homes, and rental units — without dollar limits and regardless of whether they lived there. A child inheriting a $3,000,000 Marin County home assessed at $200,000 kept that $200,000 assessed value and the roughly $2,500/year property tax bill that came with it, whether they lived there or rented it out.

Under Prop 19 (effective February 16, 2021), the rules are fundamentally different. The exclusion is now limited to the family home only — and only if the child uses it as their primary residence within one year of transfer. If the inherited home’s market value exceeds the parent’s assessed value by more than $1,000,000, there is a partial reassessment for the excess above that $1 million threshold. Investment properties, rental properties, and vacation homes inherited from parents are now fully reassessed at current market value regardless of occupancy. The grandparent-to-grandchild exclusion still exists but with similar restrictions.

The Property Tax Math in High-Value California Markets

For Marin County families, the stakes are steep. A home assessed at $300,000 under Prop 13 with a market value of $2,200,000 carries approximately $3,750/year in property taxes. Under Prop 19, if the child doesn’t move in within one year, the property is reassessed at $2,200,000 — producing approximately $27,500/year in property taxes. That’s a $23,750/year change in carrying cost. For a family planning to rent the inherited home as an investment property, this fundamentally changes the rental income math and the financing structure.

Mortgage Scenarios for Inherited California Property

When a child inherits a California home, the mortgage picture has several dimensions. The existing mortgage does not automatically transfer — the heir typically needs to refinance into their own name, reach a due-on-sale accommodation with the servicer, or sell. If the heir qualifies and moves in within one year, they protect the Prop 13 assessed value. I handle inherited property refinances regularly and structure the new loan to meet the heir’s income, credit, and equity position.

When multiple heirs inherit a property and one wants to keep it, a sibling buyout is required. The keeping heir needs to buy out the others’ ownership interests — typically through a cash-out refinance based on the current appraised value. Under Prop 19, if the buying-out sibling moves in within one year of the original transfer, the Prop 13 base is preserved on the portion below the $1M excess threshold. The buyout itself doesn’t reset the clock — the one-year window runs from the date of inheritance. I structure these buyout refinances in Marin and Sonoma County regularly and coordinate with estate attorneys to ensure the timing is right.