Proposition 19: Definition and How It Works in California

By Eric Ridley, attorney, Ridley Law. Updated September 2026.

Proposition 19 is the 2020 California ballot measure that narrowed the parent-child exclusion from property tax reassessment. A child who inherits a parent’s home keeps the parent’s assessed value only by moving in and claiming it as a primary residence, and only up to a value limit that adjusts over time; most other inherited property gets reassessed at death.

How it works in California

Ridley Law’s breakdown of the two requirements that matter covers the primary-residence rule and the filing deadline in detail. The California Constitution excludes the transfer of a family home between parents and children from reassessment, but only for the portion of value up to an exclusion amount above the home’s prior taxable value, and that exclusion amount adjusts periodically (Cal. Const., art. XIII A, § 2.1). Current figures are on Ridley Law’s 2026 California estate planning numbers page.

To get the exclusion, the child generally has to file for the homeowners’ exemption within a set window and actually move into the home as a primary residence. A rental property or a vacation home the child does not occupy no longer keeps the parent’s old assessed value the way it could before this measure passed.

Why it matters

A property tax bill can jump substantially once an inherited rental or second home gets reassessed to current market value. For example, a family that plans to keep a parent’s rental property rather than move into it should expect a new tax bill based on today’s value, not the value the parent paid decades ago. Families weighing whether to keep or sell often need county-specific Prop 19 planning before deciding.

Common mistakes

The most common mistake is assuming the old rule still applies to any inherited property, when Proposition 19 narrowed the exclusion to a primary residence the child actually occupies. Missing the filing deadline to claim the exclusion is another. Running the numbers with Ridley Law’s Proposition 19 calculator before deciding whether to keep or sell a family home avoids a surprise tax bill.

Related terms

• Step-Up in Basis: a separate, federal income tax benefit that survives Proposition 19’s property tax changes.
• Trust Administration: the successor trustee usually handles the Proposition 19 filing when the home sits in a trust.

Part of the California estate planning glossary. For the full treatment, see Prop 19 Parent-Child Exclusion: The Two Requirements That Matter.