Buying out a sibling’s share: how Prop 19 applies

01Can one child keep the parents’ house and its tax base?

One child can keep the house and the parents’ tax base, up to Prop 19’s value cap, if the house passes to that child from the parent. The Board of Equalization’s August 2026 guidance says a trust or estate can distribute the family home to one child as part of that child’s share, and the parent-child exclusion can apply if the home’s market value does not exceed the child’s share of the entire estate¹.

The usual Proposition 19 conditions still apply. The house must have been the parent’s principal residence, it must become the child’s principal residence within one year, and the child must file for the homeowners’ exemption and the exclusion on time^1,5. For transfers from February 16, 2025 through February 15, 2027, market value above the parent’s factored base year value plus $1,044,586 is added to the taxable value⁴.

Holding the house in a trust does not change this. For property tax purposes the Assessor looks through the trust to see who holds present beneficial ownership, and transfers through a trust qualify if the exclusion’s other requirements are met^1,3. The Board adds that the law sets no requirement on how title is held and does not require the trust to name an occupant¹.

02What is a non-pro rata distribution, and why does it matter?

A non-pro rata distribution gives different assets to different beneficiaries, balanced by value, instead of a fraction of each asset to everyone. California Probate Code §16246 allows it: “A distribution in kind may be made pro rata or non pro rata”². In the Board’s example, one child receives the real property and the other receives stocks and bonds of equal value¹.

It matters because of where the house comes from. Distributed whole to one child as that child’s share, the house comes from the parent, and the parent-child exclusion can apply¹. Distributed to all the children together, each child’s own share comes from the parent, but any share one sibling later buys from another comes from a sibling¹.

The Board’s answer covers a house worth no more than the child’s share. If the house is worth more than the child’s whole share, ask the estate attorney and the Assessor before planning that distribution.

03What happens if siblings trade or sell shares after distribution?

A buyout after the house has been distributed to all the siblings is a transfer between siblings, and the share bought is reassessed. In the Board’s example, a court ordered a mother’s home distributed jointly to her two sons; when one later conveyed his interest to the other, that transfer was “considered a reappraisable event” and triggered a 50% reappraisal¹.

The sibling who stays can keep the exclusion only on the share that came from the parent, and only if they qualify. The Board treats remainder interests the same way. A 25% interest one child received from siblings, rather than from the mother, was “subject to reassessment as a sibling-to-sibling transfer”¹.

Assessors can also look past the sequence. Unlike the old Proposition 58 rules, the Prop 19 statute does not prohibit the step transaction doctrine, so an Assessor who finds that a series of transfers was used to get around change-in-ownership rules may treat the series as one transfer¹.

04How does the Prop 19 value cap apply to the child who keeps the house?

The value cap works as it does in any parent-child transfer. The excluded amount is the parent’s factored base year value plus $1,044,586 for transfers from February 16, 2025 through February 15, 2027, and market value above that sum is added to the child’s taxable value^4,1. When a parent has died, the date of death counts as the transfer date⁵.

When only part of the house passes from parent to child, the Board’s formula splits the value. The share that goes to an eligible child takes the factored base year value plus any excess; a share that goes to someone else takes full market value¹. The dollar amount changes for transfers on or after February 16, 2027^1,4.

05What must that child do, and by when?

The child who keeps the house has to live in it and file on time. The home must become the child’s principal residence within one year of the transfer, and the Board says “there are no exceptions to this rule”¹. For an inheritance, the one-year clock starts on the date of the parent’s death⁵.

1. 01Move in as a principal residence within one year of the date of death^1,5.
2. 02File for the homeowners’ exemption within one year. If it is filed later, the exclusion starts only in the year of filing^1,5.
3. 03File form BOE-19-P with the county assessor within three years of the transfer, or before any transfer to a third party, whichever is earlier¹.
4. 04If the Assessor mails a supplemental or escape assessment notice, a claim filed within six months after it is also timely¹.
5. 05Separately, when the house passes through a trust, the trustee files a change in ownership statement with the county within 150 days after the death; in probate, the personal representative files it with the inventory⁷.

Probate can collide with the one-year clock. A Board analysis notes that probate “generally takes 9 to 18 months”⁸. SB 288 was held in committee on August 13, 2026⁹. Its last version would have extended the move-in year to end one year after a probate court order resolving the property, for an heir whom probate kept from moving in on time¹². Raise move-in timing with the executor or trustee early.

06Does the trust or will have to allow it?

The document controls. The Board says that if a will does not specifically prohibit non-pro rata allocations, the executor is assumed to have broad discretion. If the will names who receives which asset, such as a residence to one child and a rental to the other, the executor has “no discretion to alter the distribution scheme”¹.

For trusts, Probate Code §16246 gives the trustee the power to distribute in divided or undivided interests, pro rata or non pro rata². A trustee’s statutory powers apply “except as limited in the trust instrument,” so the trust’s own distribution clause is the first thing the attorney reads^10,2.

A disagreement about who keeps the house does not pause the move-in deadline. The one-year clock runs from the date of death, with no exceptions^1,5.

07Who should review a buyout before anyone signs?

Before anyone signs, an estate attorney should read the trust or will and decide whether a distribution or a buyout fits, and the Orange County Assessor can say how it will treat the transfer. A CPA and, if the buyout is financed, a lender answer the money questions. Each review is easier before the deeds are drafted.

• Estate attorney: whether the trust or will allows a non-pro rata distribution, how values are set, and whether the plan holds up under the step transaction doctrine¹.
• Orange County Assessor: how it will treat the transfer and which claims to file. Its family-transfer page lists (714) 834-2727⁶.
• CPA: income-tax basis. Inherited property generally takes its value at the date of death, and property you buy generally takes its cost, so an inherited share and a purchased share can carry different bases¹¹.
• Lender, if the buyout is financed: loan terms and timing are the lender’s to state.