Common law marriage in California cannot be created by living together, no matter how long you have been a couple or how publicly you present yourselves as spouses. California requires a marriage license and a solemnization ceremony, full stop. The state will, however, recognize a common law marriage you validly formed in another state before moving here, and it offers a separate protection called the putative spouse doctrine for people who genuinely believed they were legally married when they weren’t.
California Doesn’t Create Common Law Marriages
California defines marriage as a civil contract between two consenting people, but consent alone doesn’t make you married. You also need a marriage license issued by a county clerk and a ceremony performed by an authorized officiant.1California Legislative Information. California Family Code Section 300 Skip either step and no marriage exists.
This is where people get into trouble. Shared bank accounts don’t do it. Using the same last name doesn’t do it. Filing joint tax returns, raising children together, calling each other husband and wife for thirty years—none of it creates a marriage under California law. Longevity and public reputation are not substitutes for the license and the ceremony. If you want to be legally married in California, you have to actually get married.
Common Law Marriages Formed in Other States
If you established a common law marriage in a state that allows them, California will treat you as legally married. The U.S. Constitution’s Full Faith and Credit Clause generally requires states to honor marital relationships formed under other states’ laws, and California follows that principle.
The word that does the work is “validly.” You have to have actually met every element the other state requires—typically some combination of mutual present intent to be married, cohabitation, and holding yourselves out publicly as spouses. Simply having lived in a state that allows common law marriage isn’t enough. The rules differ, and the details matter.
Only a handful of states currently allow new common law marriages to form, including Colorado, Iowa, Kansas, Montana, Oklahoma, Rhode Island, Texas, and the District of Columbia.2National Conference of State Legislatures. Common Law Marriage by State A few others recognize them only under narrower circumstances or only if formed before a cutoff date. If you think you may have formed one, check that state’s specific requirements at the time you believe the marriage began.
Proving It in California
The burden of proving an out-of-state common law marriage falls on you, and it usually comes up at the worst possible moment: a breakup, a death, a dispute over property or benefits. California courts will look at whether you satisfied the originating state’s requirements, so build your paper trail before you need it.
Useful evidence includes joint tax returns filed as married, deeds and titles listing you as spouses, insurance policies and beneficiary designations, affidavits from people who knew you as a married couple, and any written statements showing mutual intent. Couples who relied on an informal understanding and never created documentation are the ones who struggle most in court.
If You Thought You Were Married: The Putative Spouse Doctrine
California protects people who believed in good faith that they were legally married, even when the marriage turns out to be invalid. Under Family Code Section 2251, when a court finds a marriage void or voidable and determines that one or both parties genuinely believed it was valid, the court must declare that person a putative spouse.3California Legislative Information. California Family Code Section 2251
This isn’t a back door to common law marriage. The doctrine applies when a couple went through what looked like a real wedding—license, officiant, vows—but something made it legally defective. The license was never properly filed. The officiant lacked authority. One spouse’s prior marriage had never been dissolved. The common thread is that the person believed a formal marriage existed, not that cohabitation created one.
What a Putative Spouse Can Claim
The designation unlocks most of the rights a legal spouse would have, which is where it carries real financial weight.
Property. Assets acquired during the relationship that would have been community property in a valid marriage are classified as quasi-marital property and divided under the same rules, generally 50/50. That includes income earned during the relationship, real estate, and retirement contributions.3California Legislative Information. California Family Code Section 2251
Support. A court can order spousal support to a putative spouse during or after a nullity proceeding, calculated the same way as support in a divorce.4California Legislative Information. California Family Code Section 2254
Wrongful death. California’s wrongful death statute specifically allows a putative spouse to bring a claim when their partner dies due to someone else’s negligence. The surviving partner must show both financial dependency on the deceased and a good faith belief in the marriage.
Children. Under Family Code Section 7611, a person is presumed to be the parent of a child born during an attempted marriage performed in apparent compliance with the law, even if the marriage is later declared invalid.5California Legislative Information. California Family Code Section 7611 The presumption can only be overcome by clear and convincing evidence, so children of a putative marriage generally have the same parentage, custody, support, and inheritance rights as children of a valid marriage.
Good faith is judged objectively: would a reasonable person in the same situation have believed the marriage was valid? Someone who knew their partner was still married to another person wouldn’t qualify. Someone with no reason to suspect a problem with the license or officiant likely would.
If You’re Just Unmarried: Marvin Claims and Cohabitation Agreements
If you and your partner never married and never thought you had, the putative spouse doctrine doesn’t apply. You still have options, but they’re narrower.
The California Supreme Court’s 1976 decision in Marvin v. Marvin held that unmarried partners can enforce agreements about sharing property and providing financial support, whether those agreements are written or implied from conduct.6Justia. Marvin v Marvin Family law community property rules don’t apply to unmarried couples, but ordinary contract law does. These are sometimes called Marvin claims.
In practice, they’re much harder to win than divorces. You have to prove the usual contract elements: that an agreement existed, that both parties gave something of value, and that one party broke the deal. The agreement cannot rest solely on a sexual relationship; there has to be other consideration, such as domestic services, career sacrifices, or financial contributions.
A written cohabitation agreement is the most reliable protection by a wide margin. Without one, you’re asking a court to find an implied agreement based on years of behavior, which is expensive litigation with uncertain results. If you plan to stay unmarried in California, putting your financial arrangement in writing is one of the most practical things you can do.
Federal Recognition Still Follows the Originating State
Moving to California does not undo a valid out-of-state common law marriage for federal purposes. Several federal agencies will continue to treat you as married.
The IRS recognizes common law marriages that are valid under the laws of the state where the marriage was created, so you can file federal returns as Married Filing Jointly or Married Filing Separately regardless of what California does.7Internal Revenue Service. Publication 501, Dependents, Standard Deduction, and Filing Information
The Social Security Administration recognizes valid common law marriages for spousal and survivor benefits. The SSA looks at whether the couple had mutual consent, intended the marriage to be permanent, cohabited, and held themselves out as married, consistent with the originating state’s requirements.8Social Security Administration. Common-Law Marriage – General The union must have been intended as permanent, endable only by death, divorce, or annulment.
USCIS will recognize a common law marriage for visa petitions and green card applications if the marriage was valid where it was formed, both spouses were legally free to marry at the time, and the marriage is consistent with U.S. public policy. USCIS notes that complications can arise when the couple’s current state doesn’t recognize the marriage, which is exactly the situation California residents may face.9USCIS. Policy Manual Volume 6, Part B, Chapter 6 – Spouses
Protecting Yourself Without a California Marriage
The biggest risk isn’t that the law is complicated. It’s that people assume protections exist when they don’t. Without a valid marriage, a putative spouse finding, or a written agreement, you have no automatic right to your partner’s property, no claim to support, no standing to make medical decisions, and no inheritance rights if your partner dies without a will. California’s intestate succession laws recognize only legal spouses and blood relatives.
If you moved here from a state that allows common law marriage, gather your documentation now, while memories and records are fresh. If you’re in a long-term relationship with no plans to marry, a cohabitation agreement plus basic estate planning—a will, powers of attorney, and healthcare directives—can fill most of the gaps that the absence of marital status creates.