What Is Community Property and How Does It Work?

Community property is a system of marital ownership used in nine U.S. states, under which almost everything either spouse earns or acquires during the marriage is owned equally by both, regardless of whose name is on the paycheck or the title. The nine states are Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. If you live in one of them, the rule applies to you automatically from the day you marry, with no agreement required.¹

Every other state follows “common law” or “equitable distribution” rules, where property generally belongs to the spouse who earned it or holds title, and courts divide assets based on fairness when a marriage ends. Five states — Alaska, Florida, Kentucky, South Dakota, and Tennessee — let couples voluntarily opt in to community property treatment through a special trust or written agreement, usually to capture a federal tax benefit at death. The IRS has only specifically addressed the Alaska, South Dakota, and Tennessee elections, so couples using the Florida or Kentucky versions should consult a tax professional before assuming the same treatment applies.¹

What Counts as Community Property

The community pot generally includes everything of financial value that comes into the marriage from the wedding date until a formal separation or divorce filing. That covers:

Wages, salaries, bonuses, and commissions earned by either spouse.
Anything bought with those earnings — cars, homes, furniture, electronics — even if only one spouse’s name is on the title.
Interest on bank accounts, rental income from properties bought with marital funds, and retirement contributions made during the marriage.
A business started or grown during the marriage with community funds or either spouse’s labor.

Debts work the same way. Obligations taken on during the marriage for the household — medical bills, grocery credit card balances, car loans — are typically treated as joint liabilities, and a creditor can reach community assets to collect even if only one spouse signed. Debts a spouse brought into the marriage generally remain that spouse’s alone, and creditors usually cannot pursue the other spouse’s separate assets or income to satisfy them.¹

What Stays Separate

Not everything a married person owns belongs to both spouses. Separate property typically includes:

Anything you owned before the wedding — a house, a savings account, a vehicle.
Gifts given specifically to one spouse, whether from a relative, a friend, or the other spouse.
Inheritances received through a will or family estate, no matter when during the marriage they arrive.
Personal injury awards paid to one spouse, except for any portion that replaces wages the injured spouse would have earned during the marriage.

Income From Separate Property Depends on Your State

One of the most consequential differences among community property states is how they treat income generated by separate assets — dividends on stock you owned before marriage, rent from an inherited house, interest on a pre-marital savings account.¹

In Arizona, California, Nevada, New Mexico, and Washington, that income stays separate. The dividends from your pre-marital brokerage account belong to you alone.

In Idaho, Louisiana, Texas, and Wisconsin, income from separate property is community income. Your spouse owns half of it. If you live in one of these four states and want to keep that income separate, you generally need a written agreement with your spouse, such as a prenuptial or postnuptial agreement, along with careful recordkeeping so the funds don’t mix with marital accounts.¹

How Separate Property Can Lose Its Status

Separate property keeps its character only as long as you maintain clear boundaries. Two mechanisms can change that character, one accidental and one deliberate.

Commingling happens when separate and community funds get mixed together until they can no longer be told apart. Depositing an inheritance check into the joint checking account you use for mortgage payments and groceries is the classic example. Once the separate money loses its identity in the shared pool, it typically becomes community property. In a divorce, the spouse claiming funds are separate carries the burden of tracing them back to their original source.

Transmutation is the intentional reclassification of property from separate to community, or the reverse, through a written agreement between the spouses. A prenuptial agreement, a postnuptial agreement, or a standalone written declaration can convert a pre-marital house into jointly held community property. Community property states generally require a signed writing that clearly states the intent to change the property’s character. An oral promise or a change in how the property is used is usually not enough.

To protect separate property, keep those funds in accounts titled only in your name, avoid mixing them with marital earnings, and hold on to records showing where the money came from.

How Community Property Is Divided in Divorce

When a couple in a community property state divorces, the starting point for dividing shared assets and debts is a 50/50 split. The rule is less rigid than it sounds. Some states stick closely to equal division, while others give judges flexibility. Texas requires a “just and right” division. Washington allows a “just and equitable” division. Neither phrasing always means exactly half.

The equal-division rule applies only to community property. Each spouse keeps their separate property outright. The hard part is often proving which assets are separate and which are community, especially in a long marriage where commingling has blurred the lines.

Retirement Accounts and Pensions

Retirement accounts earned during the marriage are community property to the extent contributions or benefits accrued while married, but dividing them involves federal rules that override state law in important ways.

For employer-sponsored plans like 401(k)s and pensions, federal law generally prohibits paying benefits to anyone other than the account holder. The only exception is a Qualified Domestic Relations Order, or QDRO, a court order issued as part of the divorce that directs the plan administrator to pay a portion of the benefits to the non-employee spouse. Without a properly drafted QDRO, the plan has no obligation to honor a state court’s community property division, even if the divorce decree awards half the account to the other spouse. Getting the QDRO approved by the plan administrator before the divorce is finalized helps avoid later disputes.²

IRAs work differently. No QDRO is required. Federal tax law allows a tax-free transfer of IRA funds between spouses or former spouses as part of a divorce or separation agreement, but the transfer has to go directly from one spouse’s IRA to an IRA in the other spouse’s name. If one spouse withdraws the money first and hands it over, the IRS treats it as a taxable distribution, which can trigger income taxes and early withdrawal penalties.³

What Happens When a Spouse Dies

When one spouse dies, the surviving spouse automatically keeps their own half of the community property. The deceased spouse’s half passes according to their will, or through the state’s default inheritance rules if there is no will. A spouse can leave their 50% share to anyone — children from a prior marriage, a sibling, a charity — and the surviving spouse has no claim to that portion beyond what they already own.

The Double Stepped-Up Basis

The biggest financial advantage of community property shows up at death rather than divorce. Under federal tax law, when someone dies, their assets generally receive a “stepped-up basis,” meaning the value for capital gains purposes resets to fair market value on the date of death. For community property, this reset applies to both halves of the asset, not just the deceased spouse’s share.⁴

Suppose a couple bought stock for $50,000 during their marriage and it’s worth $500,000 when one spouse dies. In a common law state, only the deceased spouse’s half gets the step-up, resetting from $25,000 to $250,000. The surviving spouse’s half keeps its original $25,000 basis, so a later sale could trigger capital gains tax on up to $225,000 of that half. In a community property state, both halves step up to $250,000, giving the surviving spouse a full $500,000 basis and potentially eliminating the capital gains tax on a sale at that price.⁴

This double step-up is the main reason couples in opt-in states like Alaska, South Dakota, and Tennessee set up community property trusts in the first place.

How Community Property Affects Your Tax Return

Community property rules affect your federal income tax return only if you and your spouse file separately. Most married couples file jointly, which puts all income on one return and makes the classification irrelevant for tax purposes. If you file as married filing separately, though, you must report half of all community income on your return, plus all of your own separate income.¹

Each spouse filing separately must also complete and attach Form 8958, which shows how community income was divided between the two returns. This covers wages, interest, dividends, and anything else classified as community under your state’s rules. Getting the allocation wrong can trigger IRS notices and penalties.¹

Moving Between States

Moving from one type of state to another does not automatically reclassify property you already own. Assets earned while living in a community property state generally keep that character after a move to a common law state. Common law states don’t recognize “community property” by that name, but their courts have used legal theories such as constructive trusts to protect each spouse’s ownership interest in property originally acquired under community property rules.

The reverse move brings in a concept called “quasi-community property.” Several community property states treat assets that would have been community property if the couple had lived there when the assets were acquired as quasi-community property for purposes of divorce or death. A court then divides those assets the same way it divides true community property.

If you’ve lived in more than one state during your marriage, the classification of each asset may depend on where you lived when you acquired it, what kind of asset it is, and which state’s court ends up handling your divorce or estate. Records of where you lived and when you bought major assets can save a lot of trouble if those questions come up later.

1
Internal Revenue Service. Publication 555 (12/2024), Community Property
2
U.S. Department of Labor. QDROs – An Overview FAQs
3
Office of the Law Revision Counsel. 26 USC 408 – Individual Retirement Accounts
4
Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent