The $400,000 Sibling Buyout Mistake
A Prop 19 sibling buyout can quietly destroy your parents’ low property tax basis if you take the wrong first step. Here’s why taking an inherited home out of the trust can trigger a massi...
Scott Stollar is a REALTOR® (DRE #02136497) licensed since 2021, with 7 years of pre-license experience in San Diego real estate, focused on inherited and probate homes.
Capital gains tax inherited house San Diego questions usually start here: if you inherit a home in San Diego and sell it, you’ll likely owe little or no capital gains tax on the years before you owned it. The IRS resets your cost basis to the home’s fair market value on the date of death, called the step-up in basis, so you’re only taxed on appreciation that happens after you inherit it, not the decades of appreciation before that.
Put the broom down. While you’re spending your weekend scrubbing forty years of dust out of a North County Coastal house that isn’t yours yet, the IRS already has an answer to the question you’re actually scared to ask: how much of this is going to get taxed away. Before a single box goes in the dumpster, let’s talk about the step-up in basis, because it changes the math more than almost anything else in this process.
Will I owe capital gains taxes if I sell the San Diego home I inherited?
Probably far less than you’d think, and often nothing at all. When you inherit a home, the IRS resets your “cost basis” to the home’s fair market value on the date your loved one died, a rule called the step-up in basis (IRC Section 1014). That erases the decades of appreciation that happened before you owned it. If the home is worth close to what it was worth on the date of death when you sell, there’s little or no taxable gain, even if your parents bought the place in Vista or Encinitas in 1985 for a fraction of today’s price.
That’s the opposite of what happens if a home is gifted while the owner is still alive. A lifetime gift usually carries over the giver’s original, much lower basis (IRC Section 1015), which is why timing and method of transfer matter so much for a family’s tax exposure. Inheriting the house, rather than being added to title early, is usually the better tax outcome.
What is the step-up in basis, and how does it apply to my inherited home?
Your new basis equals the home’s fair market value on the date of death, not what your parents originally paid. Say a home in Carlsbad was purchased in 1988 for $180,000 and was worth $1.2 million the day the owner passed. Your basis is $1.2 million. Sell it for $1.25 million a few months later, and you’re only looking at $50,000 of gain, minus selling costs, not $1.07 million.
This is the single biggest reason clients come to me relieved instead of panicked once we actually run the numbers. The tax bill people fear is almost always calculated off the original 1970s or 1980s purchase price in their head, not the real, current-law basis. Once they see the step-up in basis explained on paper, most of that fear evaporates.
How do I actually establish what the home was worth on the date my loved one died?
You establish it with a licensed appraiser’s date-of-death valuation, or by looking at what the home actually sold for if you sell it within a reasonable window of the death. A full appraisal is the gold standard, especially if the estate will ever face an IRS review, a dispute among co-owners, or a probate filing, because a real estate agent’s opinion of value doesn’t carry the same weight if that number is ever questioned.
In my own practice, I’ll sometimes put together a broker’s opinion of value to help a family get oriented on price before they’ve decided what to do, and some CPAs or attorneys are comfortable using that for informal planning. But when the number needs to hold up, whether that’s an estate tax filing, a sibling buyout, or an audit, a licensed appraiser’s report is what actually protects you.
What if it’s already been a year or two since I inherited the house?
You can still get that date-of-death value. Appraisers routinely perform what’s called a retrospective, or date-of-death, appraisal, reconstructing what a home was worth on a specific past date using historical comps and market data, sometimes going back many years. If you know you’re going to sit on the decision for a while, order that appraisal now rather than later. The comps get harder to reconstruct the longer you wait, and in North County’s tighter micro-markets, like the older Encinitas and Vista neighborhoods where sale data can be thin, that gets harder faster than people expect.
What if I hold onto the house and rent it out instead of selling right away?
You still keep the step-up in basis. What changes is which portion of any future gain gets taxed. Your basis locks in at the fair market value on the date of death, and from that point forward, any additional appreciation while you own it, plus any depreciation you claim if it’s a rental, factors into the gain when you eventually sell.
One thing worth clearing up here: you may hear that selling “within six months” of a death guarantees a tax-free sale. That’s not quite the rule. The actual six-month provision in the tax code (IRC Section 2032) is a narrow election available only to larger estates that file a federal estate tax return, letting the executor value the whole estate six months out instead of at death. For most families, the reason selling soon after the death helps isn’t a special six-month exemption, it’s that a sale close to the date of death is strong, simple evidence of what the fair market value actually was. The step-up itself doesn’t expire on a clock.
Does California tax capital gains differently than the IRS?
Yes, and it’s worth planning around. Unlike the federal government, which taxes long-term gains at preferential rates, California taxes all capital gains as ordinary income, up to 13.3%, according to the Franchise Tax Board. There’s no separate, lower California rate for a gain you’ve held a long time. That’s on top of whatever federal capital gains tax applies, so a large gain in a high-income year can land harder in California than people expect from reading federal-only advice online.
| Path | What happens to your basis | When does the clock matter |
| Sell soon after inheriting | Basis = date-of-death value; sale price is strong evidence of that value | No hard deadline, but comps and memory of condition fade over time |
| Hold, then sell later | Basis stays fixed at date-of-death value; only later appreciation is taxable gain | Get the date-of-death appraisal now regardless of when you sell |
| Turn it into a rental first | Same starting basis, plus depreciation you claim reduces basis and is taxed back (recapture) at sale | Track depreciation from day one of rental use |
| Home is gifted to you while owner is alive | Basis usually carries over from the original owner’s much lower purchase price | Can create a much larger taxable gain than inheriting the same home |
What this means for you, and your next step
Strategic steps with solid support shape your success, and nowhere is that more true than in the first few weeks after inheriting a home. The tax side of this is rarely as scary as it feels while you’re still sorting through a closet full of someone else’s decisions. Once you know your real basis, most families find there’s more room to breathe, and more options, than they thought.
My free Inherited Home Playbook walks through this and the other early decisions side by side, so you’re not making them in isolation. You can also grab the Capital Gains Estimate worksheet to bring your own numbers. And if you want the actual numbers run against your specific San Diego property, book a free Inherited Home Strategy Session. We’ll look at your real timeline, your real comps, and loop in your CPA or the estate’s attorney for the parts that need their sign-off.
This is general education, not legal or tax advice. Every estate is different, and the right professional to confirm your specific numbers is your CPA or the attorney handling the estate.
Watch the video and read the full transcript
Estimating Your Capital Gains on an Inherited San Diego Home
This is a simplified, illustrative example only, not a substitute for a real appraisal or your CPA’s calculation.
The scenario: A single-story home in Vista, purchased by the original owner in 1988 for $175,000. The owner passed away in 2024. A licensed appraiser’s date-of-death report values the home at $950,000. The family sells the home in 2026 for $1,010,000, paying $65,000 in commission, escrow, and closing costs.
Step 1: Find your basis. Basis = fair market value on the date of death = $950,000 (Not the 1988 purchase price of $175,000. That number no longer matters for your taxes.)
Step 2: Find your net sale proceeds. Sale price ($1,010,000) minus selling costs ($65,000) = $945,000
Step 3: Calculate the gain (or loss). Net proceeds ($945,000) minus basis, original purchase price, ($950,000) = -$5,000 In this example, there is no taxable gain. The family may even have a small deductible loss to discuss with their CPA.
Where to go for the real numbers on your property:
Your actual tax liability: your CPA, using the appraised date-of-death value and your closing statement.
Probably far less than you’d think, and often nothing at all. The IRS resets your cost basis to the home’s fair market value on the date your loved one died, a rule called the step-up in basis (IRC Section 1014). That erases the decades of appreciation that happened before you owned it, so if the home is worth close to what it was worth on the date of death when you sell, there’s little or no taxable gain.
Your new basis equals the home’s fair market value on the date of death, not what your parents originally paid. For example, a home purchased in 1988 for $180,000 that was worth $1.2 million the day the owner passed has a stepped-up basis of $1.2 million. Sell it for $1.25 million a few months later, and you’re only looking at $50,000 of gain, minus selling costs, not $1.07 million.
Yes, you keep the step-up in basis either way. What changes is which portion of any future gain gets taxed. Your basis locks in at the fair market value on the date of death, and from that point forward, any additional appreciation while you own it, plus any depreciation you claim if it’s a rental, factors into the gain when you eventually sell.
Yes. Unlike the federal government, which taxes long-term gains at preferential rates, California taxes all capital gains as ordinary income, up to 13.3%, according to the Franchise Tax Board. There’s no separate, lower California rate for a gain you’ve held a long time, and that’s on top of whatever federal capital gains tax applies.
Most people find it helps to know the real costs before they call a lender or tell their family they’re buying them out. Here’s how to get that number first.
How the step-up in basis works when you inherit a San Diego home, how to establish date-of-death value, and what changes if you rent it out first.
The 7 steps to sell a house held in a trust in California, from confirming title to closing escrow, plus the Heggstad petition fix for trusts.
