How Step-Up in Basis Can Affect Your Taxes
Inheriting a house can come with a long list of questions. Should you keep it? Sell it? Rent it? What taxes will you owe? And how do you determine what the property was actually worth when you inherited it?
One of the most important tax concepts to understand is called step-up in basis.
Although the term sounds complicated, the basic idea is relatively simple: when you inherit real estate, your tax basis in the property is generally adjusted to its fair market value as of the previous owner's date of death.
That adjustment can have a major impact on the capital gains taxes you may owe when the property is eventually sold.
This article explains step-up in basis in straightforward terms, including how it works, why the date-of-death value matters, and how a real estate appraisal may be used to establish that value.
Important: This article provides general educational information and is not tax or legal advice. Tax situations vary, and inherited-property owners should consult a qualified CPA, tax professional, or attorney regarding their specific circumstances.
First, What Is "Basis"?
Before understanding a step-up in basis, it helps to understand tax basis.
Your basis is essentially the value the tax system uses as a starting point when calculating a gain or loss on the sale of an asset.
For someone who purchases a house, the starting basis is generally related to what they paid for the property, although certain costs and improvements can increase or otherwise adjust the basis over time.
For example:
Original purchase price: $300,000
Major qualifying improvements over the years: $100,000
Adjusted basis: $400,000
If that owner later sold the property for $1,000,000, the difference between the sale proceeds and adjusted basis would be an important part of calculating the taxable gain.
Inherited property, however, is generally treated differently.
What Is Step-Up in Basis?
When someone dies and you inherit their property, you generally do not simply inherit their original tax basis.
Under current federal tax rules, the basis of inherited property is generally its fair market value on the date of the owner's death. There are exceptions, including situations involving an alternate valuation date or certain special valuation rules.
When a property has increased in value during the deceased owner's lifetime, this adjustment is commonly referred to as a step-up in basis.
Consider a simple example.
Your father purchased a California home in 1985 for:
$200,000
Over the following decades, the property increased substantially in value.
When he passed away, the home had a fair market value of:
$1,200,000
You inherited the property.
Generally, your starting basis would be based on the property's $1,200,000 fair market value at the date of death, rather than your father's original $200,000 purchase price.
That difference can become extremely important if you later sell the property.
Why Does Step-Up in Basis Matter?
Imagine that you sell the inherited house one year later for:
$1,300,000
If you had inherited your father's original $200,000 basis, the appreciation over all those decades could potentially enter into the gain calculation.
But that generally isn't how inherited property works.
Instead, using our simplified example:
Date-of-death fair market value: $1,200,000
Later sale price: $1,300,000
Difference: $100,000
In simplified terms, the potential gain is based on the change in value after the date-of-death valuation, rather than all of the appreciation that occurred during your father's ownership.
Actual taxable gain can differ because selling expenses, improvements, depreciation and other adjustments may affect the calculation. But this example illustrates why establishing the property's correct basis is so important.
What If the House Is Sold Soon After You Inherit It?
Suppose your mother passes away and leaves you her home.
The house is worth approximately $900,000 when she dies.
Six months later, you sell it for $920,000.
In simplified form:
Fair market value at date of death: $900,000
Sale price: $920,000
Difference: $20,000
You generally wouldn't calculate the gain starting from what your mother originally paid for the house decades earlier.
Instead, the inherited property's basis is generally established using its value at the date of death.
Another useful rule is that when inherited property is a capital asset, the IRS generally treats a later gain or loss as long-term, regardless of how long you personally held the inherited property.
What Does "Fair Market Value at Date of Death" Mean?
This is where real estate valuation becomes particularly important.
The IRS generally defines inherited-property basis using fair market value, commonly abbreviated as FMV.
For residential real estate, the relevant question becomes:
What would this property reasonably have been worth in the open market as of the owner's date of death?
That date may be very different from today's date.
For example, assume someone passed away on:
March 15, 2023
The family doesn't decide to sell the property until:
August 2026
The home's current value isn't necessarily the value needed to establish its date-of-death fair market value.
The relevant valuation may need to answer:
What was this property worth on March 15, 2023?
That requires looking backward in time.
What Is a Date-of-Death Appraisal?
A date-of-death appraisal is generally a retrospective real estate appraisal performed to develop an opinion of a property's value as of the owner's date of death.
Unlike a typical appraisal asking, "What is this house worth today?" a retrospective appraisal asks:
"What was this house worth on a specific date in the past?"
The appraiser researches the property and market conditions applicable to that historical period.
Depending on the property and assignment, that may include analyzing:
Comparable sales from the relevant period
Market conditions at the time
Property characteristics
Location
Site size
Living area
Condition and quality
Improvements
Views or other amenities
Other factors that market participants would have considered
The goal is to develop a supportable opinion of the property's fair market value as of the applicable historical date.
What If You Didn't Get an Appraisal When the Person Died?
This is a common concern.
Families often don't realize they may need a historical property value until months—or even years—after someone has passed away.
Fortunately, an appraisal does not necessarily have to be physically performed on the date of death.
A qualified appraiser can often complete a retrospective appraisal later, with an effective value date corresponding to the date of death.
For example:
Your father passed away in 2022.
You inherited his house but kept it as a rental property.
In 2026, you decide to sell.
Your accountant asks for documentation of the property's fair market value when your father died.
An appraiser may be able to complete the appraisal in 2026 while developing an opinion of value as of the applicable date in 2022.
The passage of time can make reliable records especially useful. Photos, repair records, inspection reports and other documents may help establish what the property was like as of the historical valuation date.
What If the Property Went Down in Value?
Despite the common phrase "step-up in basis," inherited-property basis can also reflect a lower value.
Suppose a parent purchased a home for:
$1,000,000
At the time of the parent's death, the property was worth:
$850,000
The general inherited-property basis rule looks to fair market value at death—not automatically to the owner's original purchase price.
So the concept is more accurately understood as an adjustment of basis to fair market value, even though "step-up in basis" is the term most people recognize.
Does Step-Up in Basis Mean You Owe No Taxes?
Not necessarily.
Step-up in basis does not mean an inherited house can always be sold tax-free.
It establishes the property's starting basis for determining the gain or loss that occurs afterward.
Consider another example.
You inherit a home worth:
$1,000,000 at the date of death
You keep it for five years.
During that time, the market increases substantially.
You eventually sell the property for:
$1,400,000
There has now been significant appreciation since the date-of-death value.
The $1,000,000 inherited basis becomes an important starting point in determining the gain. Other adjustments may also apply.
This is why the phrases "I inherited the house" and "I don't owe capital gains tax" should not automatically be treated as the same thing.
Step-Up in Basis vs. Property Taxes
This is another area that causes considerable confusion.
Income-tax basis and property-tax assessed value are not the same thing.
A step-up in basis relates to determining gain or loss for income-tax purposes.
Property-tax reassessment is governed by state and local law.
California provides a good example.
An inherited California home can receive a new income-tax basis based generally on its fair market value at death while the inheritance can also trigger a property-tax reassessment.
Those are separate issues.
Under California's Proposition 19 rules, certain transfers of a family home between parents and children can qualify for an exclusion from full reassessment when specific requirements are met. Among other requirements, the property generally must have been the parent's principal residence and become the child's principal residence. Different rules apply to other inherited real estate, such as rental property.
So someone inheriting a California property should not assume that a step-up in federal income-tax basis means the property's existing property-tax assessment automatically remains unchanged.
Example: An Inherited California Home
Consider a more complete hypothetical example.
A mother purchased a Bay Area home in 1980 for:
$150,000
She lived there for more than 40 years.
When she passed away in 2024, the property was worth:
$1,500,000
Her daughter inherited the house.
The daughter eventually sold it for:
$1,575,000
For purposes of this simplified example, assume the applicable inherited basis is the $1,500,000 date-of-death fair market value.
Instead of starting with the mother's original $150,000 purchase price, the daughter's basis generally starts with:
$1,500,000
The difference between the date-of-death value and later sale price is:
$75,000
That is dramatically different from simply subtracting the mother's $150,000 original purchase price from the $1,575,000 sale price.
Again, the actual tax calculation can involve additional adjustments, selling expenses and other considerations. But this example demonstrates why the date-of-death value can be financially significant.
What If Multiple Siblings Inherit the Property?
The same basic valuation concept can apply when multiple beneficiaries inherit a property.
Suppose three siblings inherit their parents' house.
At the date of death, the property is worth:
$1,200,000
Each sibling receives a one-third interest.
Later, one sibling wants to keep the property while the other two want to receive cash for their interests.
Now the family may have several issues to consider:
What was the property worth at the date of death?
What is the property worth today?
What is each sibling's ownership interest worth?
What are the tax consequences of a later sale or buyout?
Importantly, the date-of-death value and today's value are not necessarily the same number.
A retrospective appraisal may be needed for tax or estate purposes, while a current appraisal may be useful for determining a fair present-day buyout amount.
Do You Always Need a Date-of-Death Appraisal?
Not every inherited property requires a new appraisal.
For example, the estate may already have established and reported a value for federal estate-tax purposes. In certain estates, beneficiaries may receive Schedule A of Form 8971, and federal consistent-basis rules can require the beneficiary to use the estate-tax value reported to them.
There are also exceptions to the general date-of-death valuation rule. An estate may, in qualifying circumstances, elect an alternate valuation date, and special valuation rules can apply to certain properties.
That is why beneficiaries should first speak with the executor, trustee, CPA or estate attorney and determine what valuation has already been established and what documentation is needed.
If a historical real estate valuation is required, a retrospective appraisal can then be completed for the appropriate effective date.
What Information Can Help With a Retrospective Appraisal?
If an appraisal is completed years after the date of death, information showing the property's condition at that time can be helpful.
Examples include:
Photographs
Prior listings
Inspection reports
Remodeling records
Contractor invoices
Building permits
Insurance records
Previous appraisals
Records of additions or renovations
Information about significant deferred maintenance
This can become especially important when the property's condition has changed substantially since the date of death.
For example, imagine a home was worth $800,000 in dated condition when its owner died. The heirs subsequently spent $300,000 remodeling the property, and today it is worth $1.3 million.
Using the home's current renovated condition to estimate its historical value could produce a misleading result.
A retrospective appraisal should attempt to reflect the property and relevant market conditions as they existed for the historical valuation date.
The Main Takeaway
If you inherit a house, one of the most important numbers to establish may be its fair market value as of the previous owner's date of death.
Under federal tax rules, inherited property's basis is generally its fair market value at the date of death, subject to important exceptions and special rules.
That value can later affect how much taxable gain is recognized when the property is sold.
A house that was purchased decades ago for $100,000 might be worth $1 million or more when its owner dies. In many situations, the heir does not simply inherit that original $100,000 basis. Instead, the property's basis is generally adjusted to its fair market value at death.
This is the concept commonly known as step-up in basis.
Understanding it early can make it easier to maintain appropriate records, communicate with tax professionals and make informed decisions about whether to keep, rent or sell an inherited property.
Frequently Asked Questions
What is step-up in basis on an inherited house?
Step-up in basis generally refers to adjusting the tax basis of inherited property to its fair market value as of the owner's date of death. Exceptions and special valuation rules can apply.
How do I determine the value of an inherited house on the date of death?
A retrospective real estate appraisal can develop an opinion of the property's fair market value as of the historical date of death. The appraiser analyzes the property and relevant market evidence from that period.
Can I get a date-of-death appraisal years later?
Yes. A retrospective appraisal can often be completed after the fact, using a historical effective date. Available records regarding the property's condition at that time can be particularly helpful.
Do I pay capital gains tax when I sell an inherited house?
Potentially. The calculation generally considers the difference between the property's adjusted basis and the amount realized when it is sold, along with other applicable adjustments. Inherited capital assets generally receive long-term capital-gain treatment regardless of how long the beneficiary personally held them.
Is step-up in basis the same as a property-tax reassessment?
No. Income-tax basis and local property-tax assessments are separate concepts. State property-tax rules can differ substantially.
Should I talk to a CPA before selling an inherited property?
Yes. An appraiser determines real property value; a CPA, tax attorney or other qualified tax professional determines how that value applies to your individual tax situation. When an inherited property is involved, these professionals often address different pieces of the same overall issue.