Community property vs. common-law property: Who owns what?

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For spouses, the rules of ownership can be clear—or quasi.

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You meet, you fall in love, and maybe you get married. Chances are, you’re thinking about happily ever after, not marital property law. But once you buy a home, file taxes, create an estate plan, or go through a divorce, things can get real. Where you live can significantly affect who legally owns property acquired during marriage—and what happens to that property when the marriage ends, whether through divorce or death.

The United States uses two primary systems for determining ownership between spouses: community property and common-law property. This difference is often cited during divorce, but ownership types can also affect tax reporting, recognition of capital gains, inheritance, and estate planning. For couples who move between states or own property in multiple states, understanding which rules apply can help avoid costly surprises.

At its core, community property versus common-law property depends on how ownership is determined during marriage.

In common-law property states, ownership generally follows title. If one spouse earns income or purchases an asset in their own name, that spouse typically owns it unless ownership is intentionally shared.

Community property states, on the other hand, generally operate under the assumption that income and property acquired during the marriage belong equally to both spouses, regardless of whose name appears on the title or who earned the money. Each spouse generally owns an undivided one-half interest in community assets.

The rules only apply to marital property—that is, property acquired during the marriage. Property owned before marriage, inheritances, and gifts made specifically to one spouse generally remain separate property, as long as they don’t combine or commingle those separate assets with community assets.

For example, suppose you inherit $100,000 from your parents’ estate. If you keep it in a separate account titled solely in your name, it will generally remain your separate property. But if you deposit it into a joint checking account and spend, replenish, and mix it with marital funds over many years, it will be difficult to distinguish what was originally yours, and will likely be considered community property.

Many of the community property states are located in the West and Southwest, in part due to legal traditions inherited from Spain and Mexico rather than English common law. Community property states include:

Alaska is not automatically a community property state, but couples can choose community property treatment or certain types of trusts. The remaining states, plus the District of Columbia, are common-law property states.

Whether you’re in a community property or common-law property state can help you determine what is considered “shared” during marriage, as well as what happens to that property after the marriage ends through death or divorce.

Table 1 lists what’s generally considered community property and separate property in a community property state. (Remember that if a spouse decides to merge their separate property into a joint account, commingling the assets, it can become community property.)

In common-law states, ownership is typically determined by whose name is on the title, who purchased the asset, and whether the ownership is intentionally shared. It’s also possible to choose joint ownership through joint tenancy and other forms of co-ownership. During divorce, a judge may decide on equitable distribution of assets, which isn’t always strictly along ownership lines.

If a marriage ends in divorce, and no amicable solution can be reached, a judge will decide how to divvy up the assets. In a community property state, most of what’s acquired during the marriage—no matter which spouse earned the money or bought the asset—is generally considered marital property and is subject to division.

Some couples use pre- or post-nuptial agreements to keep ownership separate. Additionally, some assets—like a business, investment, or inheritance—can remain separate as long as you don’t commingle the assets. Check state law and keep good documentation, and realize a judge’s interpretation of the law can have a big impact, whether you live in a common-law or community property state.

One of the biggest potential advantages of community property appears when one spouse dies. In a community property state, both halves of an appreciated asset may receive a step-up in basis (a “double step-up,” in estate planning lingo), which resets an inherited asset’s tax basis to its fair market value at death. In a common-law state, by contrast, only the deceased spouse’s share generally receives the adjustment. A step-up in basis resets an inherited asset’s tax basis to its fair market value on the owner’s death, potentially reducing future capital gains when the surviving spouse or other heirs eventually sell the asset.

In a common-law state, only the deceased spouse’s share receives the stepped-up basis. So if you and your spouse made a stock purchase worth $200,000 and it was worth $800,000 when your spouse passed, only their $400,000 receives the step-up to fair market value. Your half retains its original basis. If you later sold the stock for $800,000, you would owe capital gains tax on the appreciation attributable to your half of the investment.

The step-up in basis in a community property state typically applies to both halves of an asset’s value. Let’s say you buy a home for $300,000, and when your spouse dies, it’s worth $900,000. Because you’re in a community property state, the entire home’s basis increases to $900,000. Rather than potentially triggering a taxable gain when you sell the home, the sale may generate little or no taxable gain.

Property ownership affects more than taxes. It can determine who has the legal right to transfer or sell property during life, what happens to it at death, and whether your estate plan works as intended. That’s why it’s important to coordinate wills, trusts, beneficiary designations, and property titles rather than treating each as a separate decision.

Modern careers often take families across state lines, creating new complications in ownership. Moving doesn’t automatically transform every asset into community property or separate property, however. Attorneys and judges presiding over divorces often look at when the property was acquired, where the couple lived when the property was acquired, the source of the purchase funds, and whether ownership has changed over time.

Some community property states, including California, recognize quasi-community property. This generally refers to property acquired while living in a common-law state that would have been community property had the couple lived in the community property state at the time. For example, wages earned, retirement savings accumulated, or a home purchased while living in a common-law state may be treated as quasi-community property if you later divorce after moving to one of these states.

When you relocate, review your estate plan. A plan drafted in one state may still be legally valid after a move, but it may no longer produce the intended tax or inheritance results. Check that your will, trusts, beneficiary designations, and property titles still work together under your new state’s laws.

Most married couples don’t think about marital property until a major life event forces the issue. But whether your state follows community property or common-law rules can affect taxes, inheritance, divorce, and estate planning long before that day arrives.

You don’t have to memorize the laws of every state, but you should know which system governs your property. And if you move across state lines or experience another major life change, review your estate plan to make sure it still reflects your wishes—and takes advantage of the rules where you live.