Buying Out a Sibling on an Inherited House Without Losing the Prop 19 Basis

Short answer: You can often buy out a sibling on an inherited house and keep the parents’ low Prop 13 property tax basis, but only if the transfer still qualifies for California’s parent-child exclusion under Revenue and Taxation Code § 63.2. That means the sibling keeping the house has to move in as a primary residence and file for the homeowners’ exemption within a year of the transfer, and the value protected is capped at the home’s existing base year value plus $1,044,586 for transfers occurring between February 16, 2025 and February 15, 2027. How and when you pay the other siblings for their shares can also affect whether the whole transfer qualifies as parent to child or gets treated, at least in part, as a sale between siblings. Get the order of operations wrong and you risk reassessment on the share you effectively bought.

For the whole decision, including Prop 19, the step-up, and who has authority to sell, see what to do with an inherited house in California.

The Prop 19 numbers behind a sibling buyout

The cap adjusts every two years, so the figure that applies depends on when the transfer actually happens, not on when the parent died.

The order of operations for a sibling buyout

1. Confirm the base year value and the cap

   Pull the home’s existing Prop 13 base year value and check it against the cap in effect on the transfer date. If market value sits under the base year value plus the cap, the whole home keeps the low basis. If it’s over, only the value above the cap gets added.

2. Decide how the buyout gets funded

   The sibling keeping the house can pay the others directly, or financing can come into the estate or trust before the house is distributed. Those two routes aren’t always treated the same for reassessment, so pick one before any money moves.

3. Complete the buyout before the house is distributed

   Settle accounts while the estate or trust still holds title. Once the deed goes out to every sibling as co-owners, a later buyout is its own transaction and the share bought can be reassessed.

4. Move in and file within one year

   The sibling keeping the home has to make it a principal residence and file for the homeowners’ exemption, or the disabled veterans’ exemption where it applies, within one year of the transfer.

What to do next

If you and your siblings are working out a buyout on an inherited house, get the structure right before the deed moves and before anything is filed with the county assessor. Confirm the home’s existing base year value, check that number against the current cap, and talk to an estate planning attorney about how the buyout should be funded and timed so the parent-child exclusion applies the way your family expects. A trust administration already in progress is often the easiest place to build this in, since the house may still be held by the trust rather than already distributed to co-owners, which keeps more options on the table.

Frequently Asked Questions

What is the Prop 19 parent-child exclusion, and does it cover a sibling buyout?

Since February 16, 2021, California’s parent-child exclusion has let a child keep a parent’s low Prop 13 base year value on an inherited home, but only under narrower conditions than the old rule. The current exclusion sits at Revenue and Taxation Code § 63.2 and California Constitution article XIII A, § 2.1. It replaced the broader Proposition 58 exclusion, which let children keep a parent’s low basis on inherited property whether or not they ever lived there. That older rule, former Revenue and Taxation Code § 63.1, no longer applies to transfers happening after February 15, 2021. When siblings inherit a house together and one of them wants to keep it long term, the exclusion can still cover the full property. The hard part is not whether the exclusion exists. It is making sure the buyout of the other siblings does not disqualify it.

Do I have to live in the house to keep the low tax bill?

Yes. To use the parent-child exclusion, the sibling keeping the home has to make it a principal residence and file for the homeowners’ exemption, or the disabled veterans’ exemption where it applies, within one year of the transfer. A house you plan to rent out, hold as a vacation property, or leave vacant while you decide what to do does not qualify. This occupancy requirement did not exist under the old Prop 58 rules, and it is the single most common reason families lose the exclusion after inheriting a home they intended to keep.

Is there a dollar limit on how much value stays protected?

Yes. The exclusion only shelters the home’s existing base year value plus $1,044,586, for transfers occurring between February 16, 2025 and February 15, 2027. The prior cap, which applied to transfers in the two years before that window, was $1,022,600. The cap adjusts every two years, so the figure that applies depends on when the transfer actually happens, not on when the parent died. If the home’s current market value sits under the base year value plus the applicable cap, the whole property keeps the low basis. If it is over, only the value above the cap gets added to the new assessment, while the rest stays protected.

Does keeping the house in a trust avoid reassessment on its own?

No, and this is a common misunderstanding. Holding title in a revocable living trust does not, by itself, protect an inherited home from reassessment. Reassessment turns on whether the parent-child exclusion applies, which depends on occupancy and the exemption filing, not on whether title happens to sit in a trust at the time of transfer. The reverse is also true: moving a home into a revocable trust during the parents’ lifetime does not disturb the existing Prop 13 base year value. The trust is a vehicle for how title is held and how the estate gets administered after death. It is not, by itself, what determines the property tax outcome. Families who set up a living trust specifically to avoid probate on the house still have to satisfy the same occupancy and exemption requirements when a child later inherits it.

How does paying my siblings for their shares affect the exclusion?

This is where families get into trouble, and it is highly fact specific. How and when the buyout money moves, whether it comes from the sibling keeping the house paying the others directly out of pocket, or from financing brought into the estate or trust before the house is ever distributed, can affect how the transfer is characterized under California’s change of ownership rules. A direct, sibling-to-sibling purchase of someone else’s inherited share is a different kind of transaction than the estate settling accounts among the children before anyone takes title, and those two situations are not always treated the same way for reassessment purposes. The claim itself can be filed later, generally within three years of the transfer (Rev. & Tax. Code § 63.2(f)), but the transfer has to qualify when it happens, so this is not something you can clean up after the fact. It needs to be planned before the house is distributed to anyone, not after siblings already hold title as co-owners.

What happens if the house has already been distributed to all the siblings?

It gets harder. Once title has already passed to all the siblings as co-owners and one of them later buys out the others, that later purchase is generally treated as its own transaction rather than part of the original inheritance, and the portion bought can be reassessed. That is a meaningfully worse outcome than resolving the buyout while the house is still held by the estate or trust, because it can mean paying a higher tax bill on part of the property for as long as you own it. If the deed has already gone out to everyone, talk to an attorney before any money changes hands between siblings rather than after.