Key takeaways

• Step-up in basis resets the cost basis of inherited real estate to its fair market value at the date of death, often substantially reducing the capital gains tax owed when heirs sell
• The date-of-death appraisal is the typical starting point for establishing that fair market value, but it is an opinion of value at a point in time, not a final answer
• A bona fide arm's-length sale shortly after the date of death, particularly one with multiple competing offers, is often the strongest evidence of fair market value
• When the appraisal and the eventual sale diverge meaningfully, the documented market response can be the more defensible number for basis purposes
• Bringing inherited property to market with full preparation, competitive pricing, and broad exposure produces the most reliable indication of fair market value; rushed or limited-exposure sales do not
• The basis determination ultimately belongs to your CPA or tax attorney; your real estate agent's job is to produce the best market evidence

1. What step-up in basis actually does

Step-up in basis is a federal tax concept that matters specifically at the moment real estate is inherited. Under the rule, the cost basis of the inherited property resets to its fair market value as of the decedent's date of death. The original purchase price of the home, which may have been decades earlier at a fraction of current value, is no longer the relevant number for calculating the heirs' capital gain when they sell.

A simplified example:

• Original purchase price (decades ago): $300,000
• Fair market value at date of death: $2,000,000
• Sale price (months after date of death): $2,100,000
• Taxable gain: $100,000 (the difference between the sale and the stepped-up basis), not $1,800,000 (which would be the gain measured against the original purchase price)

The financial difference between those two outcomes is substantial. On long-held San Francisco and Marin homes (which is most inherited property in this region, given the appreciation over the past several decades), the step-up in basis is often the single largest tax planning consideration heirs face. Getting the basis number right matters.

The mechanics, the eligibility rules, the timing exceptions, and any state-level interactions are your CPA or tax attorney's domain. What follows in this guide is the real estate side: how the appraisal and the market sale relate, and why bringing inherited property to market the right way matters for the basis position.

2. The date-of-death appraisal: what it does, what it doesn't

The date-of-death appraisal is the standard starting point for establishing fair market value at the date of death. A qualified appraiser evaluates the property using comparable sales from the period, the condition of the home, and the market conditions in effect at the date of death, and produces a written opinion of value.

A few honest observations about appraisals in this context:

• An appraisal is an opinion of value, not a market test. A qualified appraiser is making an informed estimate. The actual market may agree with that estimate, or it may not
• Two qualified appraisers can produce meaningfully different numbers for the same property. This is not unusual, particularly for atypical homes (unique location, unusual lot, condition issues, hillside or view properties). Differences of 20 percent or more between two date-of-death appraisals on the same property are not rare
• An appraisal that is too low costs the heirs money. A low basis means a larger taxable gain on the eventual sale, and a larger tax bill
• An appraisal that is too high may not hold up. The IRS can challenge a basis that is not supported by defensible evidence
• The goal is defensible accuracy, not maximization. A basis number that is well-supported by both the appraisal and the eventual market response is much stronger than a high number with thin support

When the appraisal is the only piece of evidence, the heirs and their CPA are working with whatever the appraiser produced. When the property is brought to market, an additional and often stronger piece of evidence becomes available: what actual buyers were willing to pay.

3. When the market disagrees with the appraisal: a case study

One sale we represented illustrates the gap that can exist between appraised value and market value, and what that gap can mean for an heir's tax position.

The two appraisals were the considered opinions of qualified professionals working from the same property and the same market data. The $1.1 million spread between them is not because one was wrong and the other right. It is because appraisals on unique properties (this home had direct Ocean Beach frontage, a specific lot, and condition characteristics that did not map neatly onto recent comparable sales) involve real judgment, and qualified appraisers can land in different places.

The sale, by contrast, was not an opinion. It was the outcome of fourteen independent buyers competing for the same property in an open market, with multiple offers converging at and around the $2.6 million price point. That convergence, fourteen separate parties independently arriving at a similar conclusion, is a different kind of evidence than either appraisal alone.

4. What the sale price means for basis

A bona fide arm's-length sale shortly after the date of death is, in many tax contexts, considered strong evidence of what the fair market value at the date of death actually was. The closer in time the sale is to the date of death, the more direct the link. When the sale produces multiple competing offers in an open market, the convergence of those offers reinforces the evidence.

In the case study above, the heirs and their tax professionals had three data points to work with: a $1.5 million appraisal, a $2.2 million appraisal, and a $2.6 million market sale supported by fourteen competing offers. How those three numbers ultimately translate into a basis determination is a tax professional's decision, not a real estate agent's. But the practical reality is that the documented market response is information the heirs would not have had if the property had not been brought to market the way it was.

The takeaway, in plain terms:

• If the appraisal is high and the sale comes in low, the basis position may be more challenging. Heirs may want to consider whether they have sufficient evidence to support the higher appraised value or whether the lower sale figure is the more defensible number
• If the appraisal is low and the sale comes in high, the heirs likely benefit. The market response is evidence that the appraised value understated fair market value at the date of death, and the basis may be supportable at a higher number, reducing the taxable gain
• If the appraisal and the sale converge, the basis is well-supported and the matter is straightforward

Each of these scenarios involves judgment calls that belong to your CPA or tax attorney. Our role is to make sure that the sale, whenever and however it happens, produces the most defensible market evidence possible.

5. Why proper market exposure matters for inherited property

Not every sale of inherited property produces equally useful evidence of fair market value. The difference between a sale that strongly supports a basis position and a sale that does not usually comes down to how the property was brought to market.

A sale that produces strong evidence of fair market value typically involves:

• Adequate preparation. Cleaning, painting, refinished floors where appropriate, professional staging or styling, repairs that materially affect presentation. A property that shows poorly may sell below what its actual market value would be
• Competitive pricing. A list price calibrated to attract real buyer engagement, not an aspirational number designed to anchor expectations. Aspirational pricing in inherited-property sales often results in stale listings and price reductions that themselves become evidence the property was worth less
• Full market exposure. MLS listing, broker tour, public open houses, targeted marketing to the buyer pools who actually compete for this kind of property. A property sold to a single neighbor, an off-market acquaintance, or a relative does not produce arm's-length evidence of fair market value
• Documented competing offers. When multiple independent buyers submit offers, the offer documentation itself becomes evidence of what the market was willing to pay. Multiple offers at or near a similar number is particularly strong evidence of value convergence
• A reasonable timeline. A property that sells within a normal market window (typically 7 to 30 days on market for well-prepared San Francisco and Marin homes) supports the sale as a clean read on current value. A protracted listing with price reductions tells a different story

By contrast, a rushed sale, an off-market private sale to a single buyer, or a poorly prepared "as-is" listing without proper marketing produces a weaker indication of fair market value. Heirs and trustees in a hurry to liquidate sometimes accept the first reasonable offer rather than running the property through a competitive process. The cost of that approach is twofold: the heirs typically receive a lower sale price, and the basis position is harder to defend on a higher number even if the appraisal supports it.

6. Timing: when to bring inherited property to market

The relationship between the sale date and the date of death matters for the basis evidence. A few practical timing considerations:

• Closer to date of death is better for basis evidence. A sale within six months of the date of death is generally considered close enough that the sale price is strong evidence of fair market value at the date of death. A sale within twelve months still typically supports the link clearly
• The further out, the more adjustment is needed. Beyond twelve to eighteen months, intervening market shifts mean the sale price has to be adjusted backward to estimate the original fair market value. The link gets weaker
• Probate, trust administration, and personal logistics often dictate timing. Many estates have practical reasons the sale cannot happen in the first three or six months. That is normal. The right framing is to use the appraisal as the primary evidence in those cases, and to coordinate the eventual sale to support the basis position as well as it can
• Avoid the "stale listing" trap. A property that sits on the market for many months with multiple price reductions before selling produces a much weaker basis read than a clean sale at a competitive price. If the listing approach is not working, regroup and relaunch rather than letting the listing decay
• The alternate valuation date is a separate decision. Federal estate tax rules allow an alternate valuation date six months after the date of death in some circumstances. Whether to elect it, and the implications for basis, are tax decisions that belong to your CPA or tax attorney

The practical advice: get the date-of-death appraisal done promptly. Then coordinate the sale timeline with your CPA and your estate attorney so the sale supports the basis position rather than complicating it.

7. The right team for selling inherited property

Selling inherited real estate well is a three-party coordination. Each party has a clear role, and the best outcomes happen when all three are aligned from the start.

• The CPA or tax attorney owns the basis determination, the capital gains calculation, the estate or trust tax returns, and any decisions about elections (such as the alternate valuation date). This is the party your real estate agent reports the market evidence to, not the other way around
• The estate or trust attorney owns the legal framework: trust administration, executor authority, probate procedure where applicable, and the documentation required to transfer title from the estate or trust to the eventual buyer. They confirm you have the authority to sell and the paperwork to close cleanly
• The real estate agent owns the bringing-to-market piece: preparation, pricing, marketing, the offer process, disclosure, and the actual close. Our deliverable is the strongest possible market evidence of fair market value, plus a smooth transaction

When all three parties coordinate, the basis is well-supported, the sale produces a defensible number, and the heirs receive the proceeds with clear tax treatment. When one or more is missing or working in isolation, things get harder, and they often get more expensive.

My role on this team is the real estate piece. I work regularly with CPAs and estate attorneys across San Francisco and Marin, and I can recommend professionals to handle the tax and legal sides if you do not have those relationships in place. The sequence usually starts with a fifteen-minute call about the property, the timeline, and where the estate is in administration.

Are you handling the sale of inherited property?

A fifteen-minute call is the right first step. We can talk through where the estate is in administration, what the date-of-death appraisal situation looks like, the typical timeline from here, and how we would approach bringing the property to market in a way that supports both your sale outcome and your basis position.

Frequently asked questions about selling inherited property

An important note on tax advice

About the author

Oliver Burgelman

Broker Associate · Vanguard Properties · DRE #01388135

I've worked San Francisco and Marin real estate exclusively for over twenty-three years, with offices on both sides of the Golden Gate and a home in Sun Valley, San Rafael. Trust-held and estate-held property is a regular part of my work, and I've coordinated with CPAs, estate attorneys, and trustee-clients on inherited-property sales across both counties. The 1738 Great Highway case study referenced above is one of those sales. My job in these situations is to bring the property to market in a way that supports both the heirs' sale outcome and the basis position they will need to defend later, and to coordinate cleanly with the tax and legal professionals who own the rest of the picture. If you are handling an inherited property sale, a 15-minute call is the right first step.

Schedule a 15-min call Call (415) 244-5846 Email Oliver