If you are married and live in one of nine states, the law may consider most of what you and your spouse earned during the marriage to be owned equally by both of you, no matter whose name is on the account. That single rule shapes what your spouse owns, what they inherit, and how much tax your family pays.
What does community property mean?
Community property is a system of marital ownership in which most assets and debts acquired by either spouse during the marriage are treated as owned equally, 50/50, by both spouses. It does not matter who earned the paycheck, whose name is on the car title, or which spouse opened the bank account. The law presumes it belongs to the marital "community."
This stands in contrast to the common law (also called equitable distribution) system used by most states, where property generally belongs to the spouse who earned it or holds title, and a court divides things "fairly" rather than strictly in half at divorce or death.
The nine community property states
Nine U.S. states follow community property law by default for married couples:
- Arizona
- California
- Idaho
- Louisiana
- Nevada
- New Mexico
- Texas
- Washington
- Wisconsin
A handful of other states let couples opt in to community property treatment, usually by signing an agreement or placing assets in a special community property trust. These include Alaska, Tennessee, South Dakota, Florida, and Kentucky. Opting in is sometimes done specifically to capture the tax benefits described below, but it should never be done without professional advice.
One quick note: where the property is located and where you are domiciled both matter. A couple who built up assets in Texas and then retired to Florida may still have those assets treated as community property. This is an area where the details get technical fast.
Community property vs. separate property
Not everything a married person owns is community property. The law draws a line between two categories.
| Usually community property | Usually separate property |
|---|---|
| Wages and salary earned during the marriage | Assets owned before the marriage |
| A home or car bought with marital income | Gifts made to one spouse individually |
| Retirement contributions made during marriage | An inheritance received by one spouse |
| Business growth funded by joint effort | Personal injury awards (in many states) |
| Debts incurred during the marriage | Property kept legally separate and untouched |
The catch is that separate property can lose its protected status if it gets commingled, mixed in with marital funds, or if both spouses contribute to it over time. An inheritance deposited into a joint checking account, for example, may be treated as community property. Keeping separate property clearly separate, in its own account with good records, is what preserves the distinction.
How community property affects a surviving spouse
Here is where this matters most for estate planning. In a community property state, when one spouse dies:
- The surviving spouse already owns their own half of all community property. That half is not part of the deceased's estate at all.
- Only the deceased spouse's half passes through their will, trust, or state inheritance law.
- Separate property belonging to the deceased passes entirely through their estate.
A common misunderstanding is assuming the surviving spouse automatically inherits everything. They do not. The deceased can direct their half of the community property, and all of their separate property, to anyone they choose in a valid will or trust. If there is no will, intestate succession rules take over, and the outcome depends heavily on whether there are children, and whether those children are from this marriage or a prior one. In blended families, the deceased's half can end up going partly to children rather than entirely to the surviving spouse.
This is why couples in community property states benefit so much from clear documents. A surviving spouse's rights, including any right to a portion of the estate they cannot be cut out of, vary by state; our overview of surviving spouse rights explains the landscape.
The double step-up in basis: the big tax advantage
The single most valuable feature of community property is a tax break called the double step-up in basis, and it is worth understanding even if taxes make your eyes glaze over.
When you inherit an asset, its cost basis (the value used to calculate capital gains tax) generally resets to the fair market value on the date of death. That "step-up" can wipe out decades of taxable appreciation.
How it differs from common law states
In a common law state, if a couple jointly owns an appreciated asset and one spouse dies, typically only the deceased's half steps up. The survivor keeps their original (low) basis on their half.
In a community property state, the IRS allows both halves to step up to date-of-death value, the deceased's half and the survivor's half. That is the "double" step-up.
A concrete example
- A married couple buys a home for $200,000.
- Decades later it is worth $700,000 when one spouse dies.
- In a common law state, the survivor's basis might become about $450,000 (half stepped up, half original), leaving roughly $250,000 of potential taxable gain.
- In a community property state, the survivor's basis becomes the full $700,000, eliminating that $500,000 of gain if they sell.
The same logic applies to stocks, rental property, and other appreciated assets. For the survivor who plans to sell, this can mean tens of thousands of dollars in tax savings. Our step-up in basis guide walks through the mechanics in more detail.
Estate planning implications for couples
Living in a community property state changes a few practical decisions:
- Hold appreciated assets as community property when appropriate. Titling a long-held home or investment as community property (sometimes via a community property trust) can preserve the double step-up. This is exactly the kind of move to run by a professional.
- Keep separate property separate. If you brought assets into the marriage or expect an inheritance, document them and avoid commingling so they stay yours.
- Coordinate your will or trust. Remember you can only give away your half of the community property plus your separate property. A living trust can help manage and transfer these assets smoothly and often avoids probate.
- Mind your beneficiary designations. Retirement accounts and life insurance pass by beneficiary designation, not by your will, but community property rules can still affect a spouse's claim, especially in Texas, California, and Washington.
- Plan extra carefully in blended families. Because a deceased spouse's half can go to children rather than the survivor, couples with children from prior relationships should be deliberate about who inherits what.
If you are just getting organized, our end-of-life planning checklist is a calm place to start.
The bottom line
Community property is not just a divorce concept, it shapes ownership, inheritance, and taxes the moment one spouse dies. If you live in Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, or Wisconsin, know that you and your spouse likely co-own most of what you have built, that you each control only your own half at death, and that your family may be entitled to a generous double step-up in basis. A short conversation with a local estate planning attorney can turn these rules into real savings and real peace of mind.
This article provides general information, not legal, financial, or tax advice. Community property and inheritance laws vary significantly by state and change over time, so consult a qualified estate planning attorney or tax professional licensed in your state before making decisions.