Does Prop 13 Transfer to Heirs Under Prop 19?

In California, Proposition 13’s low tax basis does transfer to heirs, but under Proposition 19 the path is narrow. To keep a parent’s or grandparent’s assessed value, three things must be true: the property was the transferor’s primary residence, the heir moves in and makes it their own primary residence within one year of the transfer, and the property’s current market value doesn’t exceed the parent’s assessed value by more than roughly $1 million (adjusted for inflation). Miss any one of those, and the county assessor reappraises the home to market value. Inherited rentals, vacation homes, and other non-residence property no longer qualify at all.

Why the Transferred Basis Matters

Proposition 13, passed in 1978, ties property tax to purchase price rather than current market value. Your “base year value” is set when you buy, and it can rise no more than 2 percent a year regardless of what the home is actually worth.¹ The tax rate is capped at 1 percent of that assessed value, plus voter-approved bonds.

Over decades, this creates a large gap. A home bought in 1990 for $200,000 might carry an assessed value near $400,000 today while the market value sits at $1.5 million. Keeping the parent’s basis when the home passes to a child is what preserves that gap. Losing it means the heir’s tax bill jumps to reflect the full market value.

The Three Requirements Under Proposition 19

Proposition 19 rewrote the intergenerational transfer rules effective February 16, 2021, replacing the far more generous Propositions 58 and 193. The new framework lives in California Constitution Article XIII A, Section 2.1, and Revenue and Taxation Code Section 63.2.² Any transfer on or after that date must meet all three of the conditions below.

The Parent Lived There

The property must have been the parent’s or grandparent’s primary residence at the time of transfer.³ Assessors verify this by checking whether the transferor was receiving, or was at least eligible for, the Homeowners’ Exemption or Disabled Veterans’ Exemption on the property. They didn’t need to actually claim the exemption; eligibility alone is enough.

The Heir Moves In Within One Year

The child or grandchild who receives the home must make it their own primary residence within one year of the transfer date. They must also file for the Homeowners’ Exemption (Form BOE-266) or Disabled Veterans’ Exemption within that same one-year window.³ Filing the exemption claim late is costly. If the claim goes in after the one-year mark, the exclusion doesn’t reach back to the date of transfer; it starts only from the year the exemption is filed, and the heir eats the higher tax bill for the gap.⁴

The Value Cap

Even when both residence tests are met, the exclusion has a ceiling. The heir keeps the parent’s assessed value only to the extent the property’s market value doesn’t exceed the parent’s factored base year value by more than $1 million, adjusted for inflation.² The Board of Equalization updates the inflation figure every two years using the Federal Housing Finance Agency’s California House Price Index. For transfers between February 16, 2025, and February 15, 2027, the adjusted exclusion amount is $1,044,586.³

An example makes it concrete. A parent’s home has a factored base year value of $300,000 and a market value of $1.5 million at the date of death. The gap is $1.2 million, which exceeds the $1,044,586 cap by $155,414. That overage gets added to the parent’s base, giving the heir a new assessed value of about $455,414. Still far below $1.5 million, so the exclusion still saves a great deal, just not everything.

Who Counts as a Child or Grandchild

The definition of “child” is broader than many people expect. It includes biological children, adopted children, stepchildren, sons- and daughters-in-law, and in limited cases foster children.⁵ Transfers can also go child to parent, not just parent to child.

Grandparent-to-grandchild transfers qualify only if all of the grandchild’s parents who would themselves count as “children” of the grandparents are deceased at the time of the transfer.² If even one qualifying parent is still living, the grandchild exclusion doesn’t apply.

Property Held in a Living Trust

Most California families with any estate plan hold the home in a revocable living trust. That structure doesn’t disqualify the transfer. When the trustor dies, the trust becomes irrevocable, and the date of death is treated as the change-in-ownership date for property tax purposes.³ As long as the three Proposition 19 conditions are satisfied, the exclusion works the same way it would for a direct inheritance.

The date of death also decides which rulebook applies. A parent who died on or before February 15, 2021, falls under the older Proposition 58 rules, which had no residence requirement for a primary home and no value cap. A parent who died on or after February 16, 2021, falls under Proposition 19.³

What No Longer Qualifies

Proposition 19 eliminated the old $1 million exclusion for non-primary-residence property. An inherited rental duplex, beach house, commercial building, or vacant lot will be reassessed to current market value on transfer.³ There is no workaround inside the parent-child exclusion for these properties.

Mixed-use buildings get a partial answer. If you inherit a fourplex and move into one unit as your primary residence, the exclusion covers only that unit. The other three units are reassessed to market value.⁴

Family Farms Are Treated Differently

Proposition 19 kept a separate exclusion for family farms, defined as real property under cultivation or used for pasture, grazing, or producing an agricultural commodity. The $1 million inflation-adjusted cap still applies, calculated per legal parcel. The important difference: there is no primary residence requirement for family farm transfers, so the heir does not need to live on the land.⁴ The grandparent-to-grandchild “all parents deceased” rule still applies.

When Several Siblings Inherit

Only one heir needs to move in. If siblings inherit jointly, at least one of them has to occupy the home as a primary residence within a year and file the Homeowners’ Exemption; the others don’t have to live there.³ If the occupying sibling later moves out, another sibling has one year from that move-out date to move in and file a new exemption claim, keeping the exclusion alive.⁴

Selling a fractional interest to someone outside the family triggers reassessment on that portion only. The increase attributable to the sold fraction gets added to the base year value.⁶

The Exclusion Isn’t Permanent

Keeping the parent’s basis is an ongoing condition, not a one-time filing. The heir must continue using the property as their primary residence. If you move out and no eligible sibling replaces you within a year, the taxable value gets adjusted to what the market value was on the date of inheritance, plus the 2-percent-per-year adjustments that would have accumulated since. The change takes effect on the next lien date after you move out.⁷

How to Claim the Exclusion

The exclusion is never automatic. You file a claim with the county assessor’s office where the property sits, using one of two forms:

Form BOE-19-P for a parent-to-child (or child-to-parent) transfer.
Form BOE-19-G for a grandparent-to-grandchild transfer.

Both are available from the county assessor.⁴ You will need the transferor’s legal name, date of death, and the property’s Assessor’s Parcel Number, which appears on any tax bill or recorded deed. Proof that the property was the transferor’s primary residence is usually the Homeowners’ Exemption or Disabled Veterans’ Exemption on file.

Two deadlines run at once, and they punish differently:

The exclusion claim (BOE-19-P or BOE-19-G) must be filed within three years of the transfer, and before the property is transferred to a third party. A late filing while you still own the home can still qualify, but the exclusion applies only from the year you file, not back to the transfer date.⁴
The Homeowners’ Exemption (Form BOE-266) must be filed within one year of the transfer. File late and the exclusion applies only prospectively; you lose the benefit for the gap between the transfer and the filing.³

The one-year Homeowners’ Exemption deadline is the one people miss most often and the more expensive of the two. File it as soon as you move in.

Expect a supplemental tax bill at market value while the claim is being processed. If the exclusion is approved, the assessor adjusts the record and any overpayment is corrected.

If the Assessor Denies Your Claim

Start with the assessor’s office. Documentation gaps often clear up informally. If that doesn’t fix it, file a formal appeal with your county’s Assessment Appeals Board. For a supplemental assessment, which is the usual product of an inheritance reappraisal, you have 60 days from the mailing date of the notice. If you miss that window, you can still appeal when the value hits the regular assessment roll, generally between July 2 and September 15 (or November 30 in some counties), and within three years after.⁸

If the Appeals Board rules against you, the next step is a claim for refund with the Board of Supervisors. A denial there can be taken to Superior Court within six months.⁸

1
Public Policy Institute of California. Proposition 13: 40 Years Later
2
California Legislative Information. California Constitution Article XIII A Section 2.1
3
Board of Equalization. Proposition 19
4
California State Board of Equalization. Proposition 19 Fact Sheet
5
California State Board of Equalization. Property Tax Savings: Transfers Between Parents and Children
6
California State Board of Equalization. Property Tax Annotations – Fractional Interests
7
Sacramento County Assessor. Proposition 19 – Changes to Real Property Transfers
8
BOE.ca.gov. Residential Property Assessment Appeals