When a California parent buys a home for $200,000 in 1985 and dies owning it in 2026 with a market value of $2.4 million, the property tax bill the children inherit can vary by an order of magnitude depending on a few decisions made before and after the date of death. Before February 16, 2021, the answer was easy: the children kept the parent's low Proposition 13 base year value, paid roughly $2,800 a year in property taxes, and rented the place out or sold it whenever they wanted. After Proposition 19 took effect, that same property — if not handled correctly — gets reassessed to full market value the moment title transfers, and the annual tax bill jumps from under $3,000 to more than $27,000.
If you are advising a family with California real estate, planning your own estate, or inheriting a home or farm from a California parent, you need to understand the new rules. The window for getting them right is short, the paperwork is unforgiving, and several common estate planning structures that worked under the old law no longer protect the property tax base. Here is what changed, what still works, and what to do before death and within the year afterward.
The Old Law: Proposition 58 and Section 63.1
For nearly three decades, California's parent-child reassessment exclusion under Revenue and Taxation Code Section 63.1 (enacted by Proposition 58 in 1986 and extended to grandparents in 1996 by Proposition 193) was one of the most generous intergenerational tax breaks in the country. It allowed parents to transfer:
- An unlimited-value principal residence to children without triggering reassessment, and
- Up to $1 million each (in factored base year value) of other real property — vacation homes, rental houses, commercial buildings, raw land — to children without reassessment.
The children did not have to live in the inherited property. They could rent it out, leave it empty, hold it as an investment, or move in later if they wanted. The Proposition 13 base year value the parents had built up over decades simply rode along to the next generation. Many California families used this rule to convert a parent's primary residence into a long-term rental that generated income at the parent's low tax basis — a tax-efficient transfer of wealth that depended entirely on a low property tax bill.
That world ended on February 16, 2021.
What Proposition 19 Changed
Proposition 19 — passed by California voters in November 2020 — replaced Section 63.1 for transfers that occur on or after February 16, 2021. The new rules are narrower in three important ways.
1. Only the Family Home or the Family Farm Qualifies
Under the old law, any real property — within the $1 million cap — could be transferred without reassessment. Under Proposition 19, only two categories qualify:
- Family home, defined as the principal residence of the transferor (the parent or grandparent) that becomes the principal residence of the transferee (the child or grandchild).
- Family farm, defined as real property under cultivation or used for pasture, grazing, or to produce any agricultural commodity as defined by California Government Code Section 51201.
A second home, a rental property, a commercial building, raw land, or a vacation cabin no longer qualifies for any parent-child exclusion. Those properties get reassessed to current market value on transfer, period. The $1 million "other property" carve-out is gone.
2. The Transferee Must Actually Live There
For the family home exclusion, the heir must occupy the property as their own principal residence and file for the Homeowners' Exemption (BOE-266) or the Disabled Veterans' Exemption (BOE-261-G) within one year of the transfer date. This is a hard rule, not a soft preference. Missing the one-year window means the exclusion either does not apply at all or applies only prospectively from the date the heir finally files — which usually means the property is already reassessed and the savings are lost.
"Continually live there" is the operative phrase from the implementing regulations. If the heir moves in to qualify, files the paperwork, and then moves out two years later to rent the property to tenants, the exclusion ends and the assessor revalues the home to its current market value at that point.
The family farm exclusion is different — there is no requirement that the heir live on the land. The farm just has to keep being farmed.
3. The Value Cap
Even when the property qualifies and the heir moves in on time, the exclusion is capped. The protected value is the parent's factored base year value at the date of transfer, plus a $1 million inflation-adjusted floor. For transfers occurring February 16, 2025 through February 15, 2027, the adjusted floor is $1,044,586.
Here is how the cap works in practice. Say the parent's home has a factored base year value of $300,000 and a current market value of $2,400,000:
- Excluded amount: $300,000 + $1,044,586 = $1,344,586
- Excess over cap: $2,400,000 − $1,344,586 = $1,055,414
- New base year value for the heir: $300,000 + $1,055,414 = $1,355,414
The heir gets to keep the parent's $300,000 base — partially. The excess market value above the cap is added on top, creating a new "partial reassessment." Under the old law, the same transfer would have kept the base at $300,000 with zero adjustment. Under Proposition 19, the new annual tax is roughly $13,600 instead of $3,000 — a partial preservation, not a full one. For high-value coastal properties, even a qualifying parent-child transfer leaves the heir with a substantial property tax increase.
Filing the Claim: BOE-19-P, BOE-266, and the Three-Year Window
Two separate filings have to happen, and the deadlines are not the same.
BOE-19-P (parent-child) or BOE-19-G (grandparent-grandchild) is the claim for the intergenerational transfer exclusion itself. This form must be filed with the county assessor within three years of the date of death or transfer, or before the property is sold or transferred to a third party — whichever comes first.
BOE-266 (Homeowners' Exemption) or BOE-261-G (Disabled Veterans' Exemption) is the proof that the transferee actually occupies the property. This must be filed within one year of the transfer date for the family home exclusion to apply retroactively.
The two forms work together. If the heir files BOE-266 within one year and BOE-19-P within three years, the exclusion applies from the date of transfer and the parent's base year value carries forward (subject to the cap). If the heir files BOE-266 late, even within the three-year BOE-19-P window, the exclusion only applies prospectively — meaning the property is reassessed to full market value for the months between the transfer date and the late filing, and the heir cannot recover those higher tax bills.
For grandparent-grandchild transfers, there is an additional requirement: both of the grandchild's parents (who are children of the grandparent) must be deceased on the date of transfer. This rule has not changed from the prior Proposition 193 framework.
What Happens When the Property Isn't a Family Home or Farm
This is the new reality that catches the most families off guard. Under Proposition 19, every other category of real estate — rental homes, vacation properties, second homes, commercial buildings, land, mixed-use buildings where the parent didn't live as a primary resident — is fully reassessed when transferred to children.
Consider three common situations:
- The parent's beach house in Carmel. Used as a weekend home, never the primary residence. Reassessed on transfer.
- The triplex in San Francisco where the parent owned the property but lived in a separate condo nearby. The triplex is rental property to the parent and gets reassessed on transfer. The condo can qualify if a child moves in within a year.
- The retired parent's farm where the parent lived in the farmhouse and grew almonds on 40 acres. The farmhouse qualifies under the family home exclusion (if a child moves in), and the 40 acres qualify under the family farm exclusion (no occupancy required, just continued agricultural use). A well-handled transfer can keep both.
The lesson is that the parent's actual use of the property at the time of death matters enormously. A property that is technically a primary residence but mostly vacant — say, a parent who spent most of the year in another state or in assisted living — can fail the principal-residence test in audit. Documentation of the parent's voting registration, driver's license address, mail forwarding, and time spent at the property becomes critical evidence after death.
Living Trusts: Helpful but No Longer a Workaround
Most California estate plans pass property through a revocable living trust to avoid probate. Trusts still help with probate avoidance, privacy, and incapacity planning, but they no longer help avoid Proposition 19 reassessment. The trust is transparent for property tax purposes — the assessor looks through the trust to see who ultimately receives the property and whether they meet the occupancy and timing requirements.
A few trust-related rules to know:
- A revocable trust does not trigger reassessment when the parent transfers property into it during life. Reassessment is only deferred, not avoided.
- When the trustor dies and the trust becomes irrevocable, the assessor treats the property as having been transferred to whoever the trust says inherits it. If that beneficiary is a child who plans to move in, the parent-child exclusion can apply — but only with the same one-year occupancy and three-year filing requirements as a direct deed transfer.
- Holding property in an LLC does not work either. California looks through entity ownership to identify changes in beneficial ownership. Transfers of LLC interests can trigger reassessment when any single owner crosses 50 percent ownership or when more than 50 percent of original ownership has transferred cumulatively over the life of the entity.
- Discount valuations from FLP or LLC structures do not reduce Proposition 19 reassessment. The assessor uses fair market value of the real property, not the discounted entity interest value, when calculating any reassessment that occurs.
There is one narrow planning move that some families still use: gifting the property (or a partial interest) to the children during the parent's lifetime, with the children moving in immediately and filing the homeowners' exemption. This locks in the exclusion at a moment when the parent is still alive to help with the paperwork, and it avoids ambiguity about residency at the date of death. But lifetime gifting has its own federal tax consequences — primarily the loss of the step-up in basis at death under Internal Revenue Code Section 1014, which can wipe out far more in capital gains tax than the property tax savings are worth. This is a trade-off that requires running the numbers, not a one-size-fits-all answer.
The Step-Up Basis Trade-Off Most Heirs Don't See Coming
When property passes at death, federal income tax law (Section 1014) resets the heir's cost basis to the property's fair market value on the date of death. If a parent paid $200,000 in 1985 and the home is worth $2,400,000 at death, the heir's basis becomes $2,400,000 — and if the heir sells the next day for $2,400,000, there is no federal capital gains tax owed.
If the parent instead gifts the property during life, the heir takes the parent's $200,000 carryover basis (Section 1015). On a $2,400,000 sale, the heir owes federal capital gains tax on $2,200,000 of gain plus the Net Investment Income Tax — roughly $530,000 in federal tax alone, plus California state tax of about $300,000 on top.
Compare that $830,000 federal-plus-state capital gains hit against the property tax savings of keeping the parent's Proposition 13 base. Even a $20,000-per-year property tax savings would take 40 years to break even — and the heir who plans to sell within five or ten years almost always comes out far ahead with the at-death transfer, even after the partial Proposition 19 reassessment. Lifetime gifting to preserve property tax base mostly makes sense when the family intends to keep the home for the long term, not sell.
Planning Moves Before Death
If the parent is still alive and there is time to plan, several decisions affect outcomes:
- Confirm the parent's principal residence is well documented. Driver's license, voter registration, tax returns, utility bills, and mail should all show the property as the parent's primary address.
- Decide which child will move in. Only one eligible transferee needs to qualify and occupy, but the family should agree in advance to avoid a forced sale after death because no one wanted to actually live there.
- For multiple-property families, consider which properties to sell during the parent's lifetime. Rental properties and vacation homes will be reassessed at full market value when inherited, so a thoughtful sale and reinvestment strategy can avoid leaving the heirs with sudden tax bills they cannot afford.
- Talk about the family farm question. If the property includes farmland, ensure the cultivation or grazing use is documented and ongoing. A "farm" that has been fallow for years may not qualify.
- Review the trust language. Trusts drafted before 2021 may direct property to children without contemplating the new occupancy requirement. A trust amendment can build in flexibility — for example, allowing the trustee to distribute the home to whichever beneficiary will actually live there.
What to Do in the First Year After Death
When a California parent dies owning real estate, the heirs have a short and very specific list of priorities:
- Determine which property the parent occupied as a principal residence at death. Pull the death certificate, the trust, the deed, and the last few years of property tax bills and homeowners' exemption filings.
- Identify which heir (if any) is willing and able to move into the family home within one year. This person should physically relocate, change their driver's license and voter registration, and start receiving mail at the property.
- File the BOE-19-P claim with the county assessor within three years. Most counties recommend filing as soon as the heir has occupied the property and has the homeowners' exemption pending.
- File the BOE-266 Homeowners' Exemption within one year. This is the single most time-sensitive form. Counties have different mailing addresses and processing times — confirm receipt.
- Get the value cap calculation in writing from the assessor. The factored base year value plus the inflation-adjusted floor determines the partial reassessment, and assessors do make math errors that the heir is responsible for catching.
- Plan for the new tax bill. Even with the exclusion, properties above the cap will see an increase. Heirs should know the new annual carrying cost before deciding whether to keep the home or sell.
Keeping Records That Will Hold Up in an Audit
Proposition 19 audits — when the assessor revisits the exclusion claim two or three years after the fact — are increasingly common in counties with high-value real estate. The heir's job is to maintain documentation that the property is and continues to be their principal residence:
- Utility bills in the heir's name at the property address
- Insurance policy showing the property as primary residence
- State and federal tax returns filed from the property address
- Driver's license, voter registration, vehicle registration at the property address
- Bank and credit card statements mailed to the property
If the heir later moves out — for a job, a marriage, or to take care of an aging spouse — the family should understand that the exclusion ends at that point and the property is reassessed to its current market value, not retroactively from the date of death. Selling, refinancing, or transferring to a third party also ends the exclusion. The base year value gain over time becomes a moving target, and the heir who plans to flip the property in a few years should evaluate whether the exclusion is worth the time and cost of the move-in at all.
Keep Your Real Estate and Estate Records Organized from Day One
Whether you are the parent doing the planning or the heir picking up the pieces, Proposition 19 makes accurate, dated, plain-text records of property ownership, occupancy, and value changes more important than they have ever been. Property tax records, basis information, gift documentation, and trust history all need to be tracked across decades — long enough that the original advisors may no longer be around when the audit letter arrives. Beancount.io offers plain-text accounting that gives you transparent, version-controlled records of every transaction — perfect for tracking real estate cost basis, depreciation, and intergenerational transfers in a format that survives the people who set it up. Get started for free and see why families and finance professionals trust plain-text accounting for long-horizon recordkeeping.