Almost every conversation I have about inherited property starts with the same tangle.
Someone says: "We're not worried about taxes — there's a step-up in basis."
And they're right. There is. But they've just answered a question nobody asked. The step-up handles capital gains. It does nothing at all for property taxes. Those are two entirely separate systems, administered by two different agencies, operating on two different sets of rules — and in California, one of them got dramatically less generous in 2021 while the other stayed remarkably favorable.
Families lose real money in the gap between those two facts. Here's how both systems actually work, what Proposition 19 changed, and where the traps are.
A note on scope: I'm a REALTOR® specializing in trust and probate real estate. I spent years at the Santa Clara County Assessor's Office handling property tax transfers and assessment appeals, and later served as an Estate Administrator with the County's Public Guardian's Office. This is the practical landscape, not legal or tax advice. Every situation turns on facts I can't see from here — talk to your CPA and estate attorney before acting on any of it.
System One: Property Tax
California property tax rests on Proposition 13. Your assessed value is set when you buy, and it can only rise about 2% a year after that — regardless of what the market does. A family that bought in Fremont in 1994 might be sitting on an assessed value near $310,000 while the house is worth $1.4 million.
That gap is the whole ballgame. It is also exactly what Proposition 19 went after.
Death is a change in ownership. When the owner dies, the property is reassessed to fair market value as of the date of death — unless a specific exclusion applies. Not as of distribution. Not as of sale. As of the date of death.
Before February 16, 2021, Proposition 58 made this easy. A parent could transfer a principal residence to a child with no reassessment at all, at any value, plus up to $1 million of assessed value in other real property — rentals, land, second homes. Prop 19 replaced that with something much narrower.
The Parent-Child Exclusion Under Prop 19
Three conditions now have to be met, and missing any one of them triggers reassessment.
1. It has to be the family home — and it has to have been the parent's principal residence. Rental properties, vacation homes, and investment real estate get no exclusion at all. They are reassessed to full market value on transfer, full stop. (A family farm is treated separately and can also qualify.)
2. The child has to move in. The child must make the property their own principal residence within one year of the transfer, and file for the homeowners' exemption (or disabled veterans' exemption) in that same window. A child who inherits and rents it out, or keeps it as a second home, or intends to sell it — no exclusion.
3. There's a value cap. This is the part most people don't know exists.
The excluded amount is the property's factored base year value plus an indexed dollar amount. Everyone still calls it "the $1 million exclusion," but it hasn't been $1 million since 2023. The Board of Equalization adjusts it every two years using the FHFA House Price Index for California.
How the cap works in practice
Take a Fremont home with a factored base year value of $310,000 and a market value at date of death of $1.4 million. The child moves in within a year and files the exemption.
Value limit: $310,000 + $1,044,586 = $1,354,586
Market value of $1,400,000 exceeds that limit by $45,414. So the child doesn't keep the $310,000 assessment — but they don't get reassessed to $1.4 million either. The excess is added, and the new assessed value is roughly $355,414.
That's a partial exclusion, and it's still an enormous win: annual taxes around $4,400 instead of roughly $17,500.
Now change one fact. The child doesn't move in; they plan to sell. No exclusion applies. Assessed value goes to $1.4 million, and the tax bill goes to roughly $17,500 a year, accruing from the date of death — including a supplemental bill that typically arrives months later as a lump sum, long after the family assumed the tax question was settled.
Same house. Same family. A four-figure difference per month, decided by what the child does in the first twelve months.
The Grandparent-Grandchild Wrinkle
Prop 19 kept a grandparent-to-grandchild exclusion, subject to the same principal-residence and value-cap rules. But it carries one additional requirement that catches families constantly:
All of the grandchild's parents who qualify as children of the grandparent must be deceased as of the date of transfer.
The exclusion exists to handle a specific situation — the middle generation is gone, so the property skips to the grandchildren. It is not a general-purpose way to move property down two levels.
The detail worth committing to memory: a living parent cannot disclaim their interest to make the transfer qualify. Families try this. It doesn't work. Disclaiming does not satisfy the requirement that the parent be deceased. (There is a narrow carve-out: a son-in-law or daughter-in-law of the grandparent who is a stepparent to the grandchild need not be deceased.)
If either qualifying parent is alive, the grandparent-grandchild exclusion is unavailable — regardless of how the family structures it.
What Prop 19 Gave Back: Base Year Value Transfers
Prop 19 wasn't purely restrictive. It substantially expanded portability for one group, and this half gets far less attention than it deserves.
If you are 55 or older, severely and permanently disabled, or a victim of a wildfire or declared natural disaster, you can transfer your existing Prop 13 base year value to a replacement primary residence:
- Anywhere in California. The old rules limited you to the same county or a short list of counties with reciprocity agreements. That restriction is gone.
- Up to three times for those 55+ or severely disabled. (Disaster victims are treated separately.)
- Even if the replacement home costs more. Under the old rules, buying up generally disqualified you. Now, if the replacement is more expensive, the difference in value is simply added to your transferred base — you keep the benefit on the original portion.
- Within two years of selling the original home.
This provision took effect April 1, 2021.
For a Bay Area homeowner in their sixties sitting in a house they bought decades ago, this is significant. Downsizing — or moving closer to grandchildren in another county — no longer means surrendering a Prop 13 base built over thirty years. That's often the single largest financial obstacle to a move-down, and a lot of people still don't know it was removed.
System Two: Capital Gains
Now the other tax — and the good news.
When you inherit property, you get a step-up in basis under IRC §1014. Your basis becomes the fair market value as of the date of death, not what the deceased originally paid.
A home bought for $200,000 in 1994 and worth $1.4 million at date of death gives the heir a $1.4 million basis. Sell shortly afterward for $1.4 million and the taxable gain is approximately zero. Without the step-up, that same sale would carry roughly $1.2 million of gain.
This is entirely separate from Prop 19. The step-up is federal. Prop 19 is California property tax. One does not affect the other, and getting reassessed does not cost you the step-up. Families routinely conflate these and make bad decisions as a result.
Why California Does This Better Than Most States
Here's the part that genuinely surprises people, including some advisors.
California is a community property state. That's not a technicality — it produces a materially better tax outcome than a common law state.
In a common law state, when the first spouse dies, only the deceased spouse's half of a jointly owned home steps up. The surviving spouse's half keeps its original, often very low, basis.
In a community property state, under IRC §1014(b)(6), the entire asset steps up at the first spouse's death — both the decedent's half and the surviving spouse's half. This is the "double step-up."
What that's worth
A couple buys in San José in 1995 for $300,000. In 2026 it's worth $1.5 million. One spouse dies.
Common law state, joint tenancy
The decedent's half steps up from $150,000 to $750,000. The survivor's half stays at $150,000. Combined basis: $900,000. Sell at $1.5 million and roughly $600,000 of gain is exposed — reduced by the primary residence exclusion, but still substantial.
California, held as community property
The entire basis resets to $1.5 million. The surviving spouse can sell the next day with essentially zero capital gain.
On these numbers, the difference is well into six figures.
The titling trap
This benefit is not automatic, and this is where I'd focus attention:
Property held in joint tenancy — even in California, even between spouses — generally gets only the single step-up. Joint tenancy with right of survivorship is not community property, and IRC §1014(b)(6) turns on community property character.
Many California couples hold title as joint tenants because that's what someone put on a deed twenty years ago, or because a bank or title company defaulted to it. They're living in a community property state and receiving common law tax treatment without knowing it.
The alternatives that preserve the double step-up: community property with right of survivorship (Civil Code §682.1), or holding the home as community property inside a properly drafted revocable living trust. The trust route also avoids probate at both deaths, which is why it's the standard recommendation.
This is a deed question with a six-figure answer, and it gets decided years before anyone needs it.
One more item worth knowing: a surviving spouse may generally claim the full $500,000 primary residence exclusion under IRC §121 if the home sells within two years of the death, rather than dropping to the $250,000 single-filer amount. That two-year window is a real planning consideration.
Putting Both Systems Together
Three scenarios, same house — a Fremont home, $310,000 base year value, $1.4 million market value, single surviving parent passes away.
Property tax: Partial exclusion applies. New assessed value roughly $355,414. Annual tax around $4,400.
Capital gains: Basis steps up to $1.4 million. No gain unless the home appreciates further before a later sale.
Result: Best of both systems.
Property tax: No exclusion. Reassessed to $1.4 million, roughly $17,500 annually, accruing from date of death — a real carrying cost during a four-to-eight month administration, plus a retroactive supplemental bill.
Capital gains: Basis steps up to $1.4 million. Sale at $1.4 million produces essentially no taxable gain.
Result: Property tax hurts during the holding period; capital gains treatment is excellent.
Property tax: No exclusion. Full reassessment. That higher tax bill is now a permanent operating cost.
Capital gains: Basis steps up. But the clock starts running from that stepped-up value, and future appreciation is taxable when they eventually sell.
Result: This is the scenario families choose casually and regret. Run the numbers with a CPA before defaulting into it.
What to Actually Do
If you're a parent planning ahead. Understand that leaving a rental or second home to a child no longer carries any property tax protection. If keeping the tax basis in the family matters, the plan needs to account for who will actually live there. And check how your home is titled — joint tenancy versus community property is a six-figure question with a simple fix.
If you're 55 or older and feel locked in. You are probably less locked in than you think. The base year value transfer now works anywhere in California, up to three times, and buying up no longer disqualifies you.
If you just inherited a home. You have a one-year clock on the principal residence and homeowners' exemption filing, and a three-year clock on the exclusion claim itself. The decision about whether to move in isn't just emotional — it has a specific, calculable dollar value. Get that number before you decide.
If you're a trustee or administrator. Project the reassessed tax figure early and build it into the administration budget. The supplemental bill arrives retroactively, often months later, and beneficiaries will ask you to explain it.
If you're an estate attorney or CPA. The titling issue is the one I'd raise first with married clients. It's cheap to fix now and impossible to fix after the first death.
The Bottom Line
Property tax and capital gains are two different systems, and California treats them very differently.
On property tax, Prop 19 tightened things considerably for inherited property — but expanded portability substantially for homeowners 55 and older. On capital gains, California's community property status delivers a benefit that most states simply cannot offer, provided the property is titled correctly.
The families who do well are the ones who understand that these are two separate questions and answer both of them deliberately, before a deadline makes the decision for them.