The tax code offers a specific loophole for heirs that can save thousands, but the size of the savings depends entirely on where you live. It is called the stepped-up basis. When an owner dies, the cost basis of their assets resets to the fair market value on the date of death. This reset matters. If your parents bought a house for $100,000 and it is worth $500,000 when they pass away, the heir inherits it with a $500,000 basis. Sell it immediately, and there is zero capital gains tax. Sell it for $510,000, and you only pay tax on the $10,000 gain.
But not all states treat shared property the same way. This distinction becomes critical for married couples, particularly when navigating the complexities of step-up in basis for community property.
The Common-Law Reality
In the majority of states that follow common-law property rules, joint ownership does not trigger a full reset for both spouses. If a couple owns a home together, only the deceased spouse’s share of the asset typically receives the step-up.
Consider a scenario where a husband and wife own a rental property worth $1 million. They each own 50%. The husband dies. The IRS allows the wife to step up the basis of his 50% share ($500,000 worth) to the current market value. Her original 50% share retains its historical, lower cost basis. The result? A partial step-up. If she sells the property soon after, she will face capital gains tax on the appreciation that occurred during the first half of their marriage, plus any gain on the second half. The tax bill is real. It is not eliminated.
The Community Property Advantage
This is where community property states offer a distinct financial advantage. There are only nine such states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. In these jurisdictions, income and assets acquired during the marriage are generally considered owned equally by both spouses, regardless of whose name is on the title.
The federal tax code treats these assets differently. Upon the death of one spouse, the entire value of the community property asset often receives a step-up in basis. This is frequently referred to in estate planning circles as a double step-up.
Why does this matter? Because it can effectively wipe out the capital gains tax liability for the surviving spouse.
If the same $1 million property held in a community property state is sold by the widow, the basis for the whole property is reset to $1 million. No gain is recognized. The tax savings can be substantial, especially for assets that have appreciated significantly over decades. The mechanism is straightforward: the law assumes the surviving spouse already owns half, so the estate tax rules allow the deceased spouse’s half to step up, and many states interpret the rules to allow the survivor’s half to step up as well, or the entire asset is treated as part of the deceased’s estate for basis purposes.
The Trade-Offs and Nuances
This benefit is not automatic in every single case, nor is it without its own set of rules. The “double step-up”
