In the nine community property states, what is considered community property in a marriage is almost everything either spouse earns, buys, or borrows from the wedding day until the couple separates — paychecks, the house, the cars, retirement contributions, credit card balances, and the business one spouse runs alone. Both spouses own it equally, no matter whose name is on the account or the title. The main things that stay separate are what each spouse brought into the marriage, plus gifts and inheritances received during it, as long as those assets are kept unmixed with marital money.
The Nine Community Property States
Community property law applies in Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin.1Internal Revenue Service. Publication 555, Community Property Every other state uses an equitable distribution system, where property generally belongs to whichever spouse earned or received it and courts divide assets based on fairness rather than a fixed share.
Five additional states — Alaska, Florida, Kentucky, South Dakota, and Tennessee — let married couples opt in by creating a community property trust. Couples who do not live in one of the nine default states can still establish these trusts, usually to capture tax benefits tied to community property ownership.
Income and Earnings Earned During the Marriage
Any money either spouse earns through work during the marriage belongs to both of them. That covers wages, salary, commissions, bonuses, and self-employment income. The timing that matters is when the work was done, not when the check arrived. A bonus earned before separation but paid out afterward is still community property.
Retirement contributions made during the marriage are community property too, even when only one spouse is the named account holder.1Internal Revenue Service. Publication 555, Community Property That includes 401(k) and 403(b) accounts and pension benefits. For a pension that was built up partly before the wedding and partly after, courts generally use a time-rule formula: they compare years of service during the marriage to total years of service, and the community gets half of that proportional share. Stock options granted as employment compensation during the marriage are treated the same way.
Property Bought with Marital Money
Anything purchased with community income is community property from the moment of purchase. A home bought with marital earnings belongs equally to both spouses regardless of whose name is on the deed or the mortgage. The same rule applies to vehicles, furniture, electronics, jewelry, and ordinary personal property acquired during the marriage.
Investment accounts, brokerage portfolios, and mutual funds funded with marital earnings are community property as well. The law looks past the account holder’s name to the source of the money. If community wages went in, both spouses own the account equally.
Businesses
A business started or grown during the marriage is generally a community asset, even when only one spouse runs it. If marital earnings paid for startup costs, inventory, or ongoing operations, the resulting business value belongs to both spouses. In a divorce, valuation experts are often brought in to determine total equity and each spouse’s share. Appreciation that occurred because of work or investment during the marriage adds to the community interest.
Intellectual Property
Creative works and inventions developed during a marriage can qualify as community property. Patents filed, copyrights registered, and trademarks created while a couple is married are generally subject to division because the effort behind them took place during the marriage. The community interest covers ownership of the intellectual property itself and any royalties or licensing income it produces.
Debts Are Community Property Too
The same rules apply to what the couple owes. Any debt either spouse takes on after the wedding and before legal separation is generally a community obligation. Credit card balances, mortgages, auto loans, medical bills, and personal loans all count, even if only one spouse signed the paperwork or knew the debt existed. Creditors in community property states can pursue joint assets to collect.
Debts from before the marriage usually stay with the spouse who incurred them. A student loan one spouse carried in does not automatically become joint. Depending on the state, however, creditors may be able to reach a limited portion of community assets — often up to half — to satisfy a pre-marital debt. The other spouse’s separate property is generally off-limits for those older obligations.
When one spouse harms someone else through negligence or intentional conduct, whether community assets can be used to pay the resulting judgment depends on the state. If only one spouse is personally responsible, some states still let creditors reach community assets, while others protect the non-offending spouse’s separate property and share of the community.
What Stays Separate Property
Not everything a married person owns becomes community property. Four categories generally belong to one spouse alone:
- Anything either spouse owned before the wedding — bank accounts, real estate, retirement savings, vehicles — remains that spouse’s separate property.
- A gift given specifically to one spouse during the marriage, whether from a family member, a friend, or the other spouse, stays separate.
- Money or property one spouse inherits belongs to the receiving spouse alone, even when the inheritance arrives mid-marriage.
- Compensation for a personal injury claim that arose during the marriage is generally classified as community property but is typically awarded entirely to the injured spouse at divorce. Awards for injuries that happened before the marriage or after separation are separate property.
All of these protections depend on one condition: the separate property has to stay unmixed with community assets.
How Separate Property Can Lose Its Separate Status
Separate property can turn into community property through what the law calls transmutation. The two common paths are commingling and written agreement.
Commingling
Commingling happens when separate funds get mixed with community funds to the point that they can’t be told apart anymore. A typical example: one spouse inherits $50,000 and deposits it into a joint checking account that the couple uses for groceries, the mortgage, and other everyday expenses. Once the inherited dollars flow in and out alongside community paychecks, a court will generally presume the whole account is community property.
Using separate funds to pay down the principal on a jointly held mortgage is another frequent form of commingling. When community earnings are used to make mortgage payments on a home one spouse owned before the marriage, the community gains a proportional interest in that home. Courts calculate the share by comparing principal paid with community funds to the original purchase price, then awarding the community a matching share of any appreciation.
The spouse claiming that commingled funds are still separate carries the burden of tracing the money back to its original source. Without clear documentation — dedicated statements, transaction records, or ledgers showing the separate funds never mixed — the presumption favors classifying everything as community property.
Written Agreements
Spouses can also deliberately change property from separate to community, or the other direction, through a written agreement. For the agreement to hold up, the document has to clearly state that the ownership character is being changed, and the spouse giving up an interest must understand and consent. Vague language or an informal understanding is not enough. Courts look at the document itself, not later testimony about what the couple meant.
Income from Separate Property: It Depends on the State
How passive income from separate property is classified splits the community property states into two camps. In Arizona, California, Nevada, New Mexico, and Washington, rent, dividends, and interest earned on separate property stay separate. In Idaho, Louisiana, Texas, and Wisconsin, income generated by separate property is community income and belongs equally to both spouses.1Internal Revenue Service. Publication 555, Community Property A rental one spouse owned before the wedding can produce community income in one state and separate income in another, so the state you live in genuinely changes the answer.
If You Moved from a Non-Community-Property State
When a couple relocates from a common law state to a community property state, assets they brought with them may be reclassified as quasi-community property. The label applies to property that would have been community property if the couple had acquired it while living in the community property state. At divorce or at one spouse’s death, quasi-community property is divided the same way as community property. Not every community property state applies this rule identically, and treatment of real estate located in other states can vary based on the laws where the property sits.
Changing the Default by Agreement
Couples in community property states are not stuck with the default rules. A prenuptial agreement signed before the wedding can designate specific assets or categories of income as separate rather than community. All nine community property states allow couples to opt out through a written premarital agreement. Postnuptial agreements, signed after the wedding, can do the same thing, though courts scrutinize them more closely and generally expect each spouse to make a clear, informed decision with full knowledge of the other’s finances.
Even without a formal agreement, spouses can protect separate property by keeping it in dedicated accounts, never depositing community earnings into those accounts, and keeping detailed records tracing the funds back to their original source. The moment separate and community money share an account, the tracing burden shifts to the spouse claiming the funds are still separate, and without strong documentation, that claim is hard to make stick.