Common Law Marriage in Missouri: Is It Recognized? (2026)

Missouri does not recognize common law marriage formed within the state. RSMo section 451.040 has explicitly declared common-law marriages null and void under Missouri law since 1921. Missouri does, however, give full legal effect to a common law marriage that was validly formed in another state.

Information last verified on June 2, 2026.

Does Missouri recognize common law marriage?

Missouri does not allow couples to form a common law marriage within the state. RSMo section 451.040 states directly that common-law marriages shall be null and void. The Missouri Legislature first enacted this prohibition in 1921, making Missouri one of the earliest states to abolish common law marriage formation by statute. The prohibition has remained in force continuously since that time.

Because RSMo section 451.040 has been in effect since 1921, there is no grandfather cutoff date for Missouri-formed common law marriages in the same sense as states like Alabama (cutoff 2017) or Pennsylvania (cutoff 2005). Those states abolished common law marriage prospectively and preserved pre-cutoff unions. Missouri, by contrast, has not recognized the formation of common law marriages within the state for more than a century. Any couple who cohabited in Missouri and believed themselves to be common law married at any point during that period did not acquire marital status under Missouri law.

The formal marriage statute, RSMo section 451.020, requires a marriage license and solemnization as the exclusive pathway to a valid marriage in Missouri. Cohabitation for any length of time, public holding out as a married couple, or filing taxes jointly does not substitute for this requirement.

Why Missouri has not recognized common law marriage formation since 1921

Missouri's 1921 abolition statute reflected a legislative policy choice that the formalities of the licensing process under RSMo section 451.020 serve important public interests. Those interests include creating a clear and accessible public record of marital status, making the legal consequences of marriage explicit for both parties at the time they enter the relationship, and eliminating protracted litigation over whether a marriage was ever formed.

RSMo section 451.040 provides that common-law marriages shall be null and void. Missouri courts have consistently applied this provision to reject claims of a Missouri-formed common law marriage. Courts have declined to find a valid marriage even where parties cohabited for extended periods, filed joint tax returns, held joint property, and referred to each other publicly as husband and wife, because none of those facts can satisfy the statutory licensing requirement.

The length of the prohibition, more than a hundred years, also means that the legal landscape in Missouri has been clear and settled for a very long time. There is no realistic category of a pre-abolition Missouri common law marriage that might still be asserted today.

Does Missouri recognize a common law marriage from another state?

Yes. Missouri gives full legal effect to a common law marriage that was validly formed in a state that permits such marriages. This recognition flows from the Full Faith and Credit Clause of the United States Constitution, which requires each state to give credit to the public acts, records, and judicial proceedings of other states, and from the principle of comity, under which courts recognize legal relationships validly created in other jurisdictions.

In practice, a couple who formed a valid common law marriage in Colorado, Texas, Iowa, Kansas, or any other state that still allows common law marriage formation, and who then moved to Missouri, retains that marital status in Missouri. Missouri courts treat such a couple as legally married for purposes of divorce, property division, spousal maintenance, inheritance rights, intestate succession, and all other legal incidents of marriage.

To establish Missouri recognition, a party must demonstrate that the marriage satisfied the requirements of the state where it was formed. For instance, a couple asserting a Texas informal marriage under Tex. Fam. Code section 2.401 must show they agreed to be married, cohabited in Texas, and represented to others that they were married. The evidence required and the standard of proof are governed by the law of the originating state, though Missouri courts will evaluate the evidence under the originating state's standards.

How to prove a common law marriage formed in another state

A common law marriage creates no license or official certificate, so the party asserting its existence must prove it through other evidence. The burden of proof and the specific elements required depend on the law of the state where the marriage was allegedly formed, but courts examining such claims typically look at the same categories of evidence.

Types of evidence courts commonly consider include:

• Joint federal and state income tax returns filed with the couple identified as married or as husband and wife
• Joint bank accounts, joint credit accounts, or jointly titled real property such as a deed or mortgage
• Life insurance policies or retirement account beneficiary designations listing the partner as a spouse
• Statements on loan applications, government-benefit forms, or medical-record intake forms identifying the relationship as a marriage
• Testimony from family members, friends, neighbors, coworkers, or clergy who regarded the couple as married
• Written correspondence, cards, social media posts, or other documents in which the parties referred to each other as husband, wife, or spouse
• Use of a shared last name or documentation reflecting adoption of the other party's surname
• Birth certificates of children listing both parties as parents with the same last name

No single item is automatically conclusive. Courts assess the totality of the evidence against the requirements of the state where the marriage was allegedly formed to determine whether the parties genuinely agreed to be married and held themselves out publicly as a married couple.

The 7-year myth

A widespread misconception holds that living together for seven years automatically creates a common law marriage. This is false in every jurisdiction in the United States. No state, including the states that still allow common law marriage formation, sets a minimum number of years of cohabitation as a requirement or automatic trigger for marriage recognition.

States that permit common law marriage focus on the intent and conduct of the parties: a mutual present agreement to be married, cohabitation in the permitting state, and public representation of the relationship as a marriage. Duration of cohabitation may be relevant as circumstantial evidence of intent, but no fixed number of years establishes a marriage by itself.

In Missouri, this point is especially clear: the state has not permitted common law marriage formation since 1921. No period of cohabitation in Missouri, whether seven years or forty years, can create a legal marriage without a license. The seven-year figure has no basis in Missouri law or in the law of any other state.

How a common law marriage ends

A valid common law marriage, wherever it was formed, can only be terminated by a formal legal divorce. There is no such thing as a "common law divorce" and no informal mechanism to dissolve a valid marriage. Separating from a partner, dividing property informally, ceasing cohabitation, or simply no longer identifying as married does not end a legal marriage under Missouri law or under the law of any state.

This rule has significant practical consequences for Missouri residents. A person who entered a valid common law marriage in another state and then moved to Missouri, and who later "separated" from their partner without filing for divorce, remains legally married under Missouri law. If that person attempts to remarry in Missouri without first obtaining a divorce, the second marriage would be void or voidable because a valid prior marriage subsists.

Divorce proceedings in Missouri to dissolve a common law marriage formed in another state follow the same procedures as any other Missouri divorce. The court has jurisdiction over property located in Missouri, applies Missouri divorce law, and can issue orders regarding property division and maintenance under RSMo section 452.335.

For context on the financial aspects of dissolving a marriage in Missouri, see Missouri alimony laws and Missouri child support laws.

For a state-by-state comparison of which states recognize common law marriage, see Common law marriage by state.

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Disclaimer: This page provides general legal information about common law marriage recognition in Missouri and is not legal advice. Marriage and family law determinations are fact-specific and depend on individual circumstances, including the law of the state where any claimed common law marriage was formed. This information was verified as of June 2, 2026. Consult a licensed Missouri family law attorney for advice about your specific situation.

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Sources

• Missouri Revised Statutes section 451.040, Common-law marriages void. Missouri General Assembly. revisor.mo.gov
• Missouri Revised Statutes section 451.020, Marriage license required. Missouri General Assembly. revisor.mo.gov
• Missouri Revised Statutes section 452.335, Maintenance; award; factors. Missouri General Assembly. revisor.mo.gov
• U.S. Constitution, Article IV, section 1 (Full Faith and Credit Clause). Cornell Legal Information Institute. law.cornell.edu
• Texas Family Code section 2.401, Informal Marriage. Texas Legislature. statutes.capitol.texas.gov
• Common Law Marriage, Legal Information Institute. Cornell Law School. law.cornell.edu
• Colorado Revised Statutes section 14-2-109.5, Common law marriages. Colorado General Assembly. leg.colorado.gov

Last updated: June 2, 2026.