Short answer: when a California married couple holds a home as community property, the whole house gets a new cost basis at the first spouse’s death – not half of it. That is IRC Section 1014(b)(6), and it is the single most valuable rule on the board for long-time San Diego owners. Get the vesting wrong and an heir can inherit a capital gains bill that did not have to exist.
Who this is for
CPAs and enrolled agents with San Diego clients who own appreciated real estate – and the adult children who call you in October asking what to do with Mom’s house. I am a mortgage broker, not a CPA. Nothing here is tax advice, and the numbers on any specific return are yours to run. What I can give you is the lender’s side of a conversation you are already having, because financing decisions made in the first ninety days after a death quietly determine how clean the tax picture looks later.
The thing most heirs believe, and it is wrong
The belief: when one spouse dies, only their half of the house gets stepped up to current value. The surviving spouse keeps the old basis on their half, and when the house eventually sells, half the appreciation is taxable.
In a community property state, that is not how it works. Under Section 1014(b)(6), property that is community property under state law receives a new basis on both halves at the first death. California is a community property state. For a couple who bought in Clairemont in 1987 for $135,000 and whose home is worth north of a million today, the difference between a half step-up and a full step-up is not a rounding error – it is the entire decision about whether the surviving spouse can afford to sell.
How title was held decides almost everything
| How the property was held | What generally gets a new basis at the first death |
|---|---|
| Community property | Both halves |
| Community property with right of survivorship | Both halves |
| Joint tenancy | Generally the decedent’s share only – but see below |
| Tenants in common | The decedent’s share only |
| Sole ownership | The whole property |
| Revocable living trust holding community property | Both halves, where community character is preserved |
The row that causes the most trouble is joint tenancy. Plenty of California couples took joint tenancy vesting at the title company in 1994 because someone said it avoids probate, without anyone explaining what it costs at the first death. Whether that property can still be established as community property in substance is a real question with real procedures behind it – and it is a question for the estate attorney and the CPA, not for me and not for the title officer. I raise it because I see the vesting on the preliminary report before anyone else does, and flagging it early is worth more than flagging it at the closing table.
The date-of-death value is a document, not a memory
The new basis is the fair market value on the date of death. That number needs to be supportable years later, when the house finally sells and someone has to defend the gain calculation. A Zestimate screenshot is not that. A retrospective appraisal by a qualified appraiser, dated to the death, is.
There is also an alternate valuation date – six months after death – available to the executor only where the election reduces the value of the gross estate, and only if the property was not disposed of first. For most San Diego families whose estates land well under the current federal exemption, the alternate date rarely helps and often just adds a decision. Worth knowing it exists; rarely worth using.
One practical note: the appraisal a lender orders is not the appraisal the return needs. A purchase or refinance appraisal is dated today and written for a lender’s collateral file. A date-of-death valuation is dated to the death and written for a different reader. When a family orders one and assumes it covers both, somebody ends up paying for a second one anyway.
Where the loan enters the picture
Three situations put a lender in the middle of an inherited-property file, and all three have timing that interacts with your work:
- The sibling buyout. One heir wants the house, the others want cash. That is a financing event, and how it is structured – whether it is treated as a purchase or as a refinance of inherited property – changes the loan terms available and the paperwork required. It is worth a phone call before anyone signs anything.
- Refinancing to pull cash out of an inherited property. Whether the interest on that new money is deductible depends on what the money is used for, not on what the loan is called. I wrote up the mechanics in interest tracing on a cash-out refinance – it is the question I get asked most often after a step-up conversation.
- Selling instead. If the family is selling rather than keeping, the vesting and the transfer path matter to the listing side too. My colleague on the real estate side and I walked through the difference between a trust sale and a probate sale here – the two get used interchangeably in conversation and they are not the same transaction.
On rates: the 30-year fixed-rate mortgage averaged 6.76% in the Freddie Mac Primary Mortgage Market Survey published September 10, 2026, up from 6.71% the week before and 6.35% a year ago. That is a cited national average, not an offer or a quote. It matters here because a sibling buyout financed at today’s averages carries a real monthly cost, and families who spend eight months deciding sometimes find the math has moved underneath them.
What I am not going to tell you
I am not going to hand you a San Diego median sale price to anchor a date-of-death estimate on. The published medians this fall disagree with each other by more than $150,000 depending on the source and the geography, and a number that wobbles that much has no business inside a basis calculation. What is stable enough to describe the market: roughly 6,400 active listings countywide, about 3.2 months of supply – the highest since 2019 – and a median of about 25 days on market. Use those for context. Use an appraiser for the number.
Three things I watch go wrong
- Nobody orders a valuation for two years. Retrospective appraisals get harder and more expensive the further you are from the date. Order it early even if the family has no plans to sell.
- The house transfers before anyone checks the vesting. Once it moves, options narrow.
- An heir takes over the payments informally. Paying a deceased parent’s mortgage out of a personal account for three years while title sits unchanged creates a tangle for everyone – lender, CPA, and the other siblings.
Frequently asked questions
Does the step-up apply to a rental property too?
The basis rules under Section 1014 reach capital assets broadly, rental real estate included. What differs on a rental is everything that rides alongside it – prior depreciation, passive loss carryforwards, the whole history of the schedule. That is squarely your territory, not mine.
Does refinancing an inherited property reset the basis?
No. Debt and basis are separate. Borrowing against a property does not change what it cost you for tax purposes. This one surprises people constantly.
Should the family sell now or hold through year-end?
That depends on facts I do not have and a return I do not prepare. What I can say is that the financing question and the tax question should be answered in the same room, not six weeks apart.
Let’s compare notes before your clients call
If you have a client with an inherited San Diego property this quarter, I am glad to look at the vesting and the financing options alongside whatever you are modeling – no charge, no expectation. The families who come out of this cleanest are the ones whose CPA and lender talked to each other in week two instead of month eight. Book a short call with me here.
Ron Berg is a mortgage broker with The Berg Group, powered by C2 Financial Corp, working with buyers, homeowners, and referral partners across San Diego. His family emigrated from Brazil and recently finished writing a book on their lineage – which is probably why inheritance files hold his attention longer than they should. Book a partnership call.
This article is educational and is not tax, legal, or accounting advice. Tax outcomes depend on individual facts; clients should rely on their own CPA and estate attorney. Rates shown are cited national averages from Freddie Mac and are not an offer, quote, or commitment to lend. Ron Berg, NMLS #974839. C2 Financial Corp, NMLS #135622. Equal Housing Opportunity.
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