Common-law marriage is the legal proposition that a couple who present themselves to the world as married, intend to be married, and live together as spouses, are married for all legal purposes even though no license was issued and no ceremony was performed. The doctrine originated in medieval canon law, was codified into English ecclesiastical practice, and traveled to the American colonies where it became a frontier necessity — clergy and clerks were scarce, settlements were remote, and couples could not be expected to delay union for an itinerant minister. By the late nineteenth century every American state recognized common-law marriage. By 2026 fewer than ten do, and the trajectory is unmistakably toward extinction.
The institution survives in some form in Colorado, Iowa, Kansas, Montana, New Hampshire (for inheritance only), Oklahoma (contested), Rhode Island, Texas, Utah (court-determined), and the District of Columbia. South Carolina abolished it for unions formed after July 2019. Pennsylvania abolished it for unions formed after January 2005. Alabama abolished it for unions formed after January 2017. Idaho, Georgia, and Ohio cut off new common-law marriages decades earlier while continuing to recognize existing ones. The pattern is one of slow legislative attrition: states close the door but honor what came before.
The doctrinal elements are deceptively simple. A common-law marriage requires capacity to marry (legal age, not currently married to someone else), present agreement to be married (not a future promise), cohabitation, and holding out to the community as spouses. The holding-out element is the heart of the doctrine and the part most often litigated. Filing joint tax returns, using a shared surname, introducing the partner as "my husband" or "my wife" in social contexts, listing each other as spouses on insurance, deeds, and emergency contacts — these are the indicia. Courts weigh them against contrary evidence: separate finances, separate addresses, statements of being unmarried, single filing status on tax returns.
The collective function of common-law marriage was to bring informal unions within the protective ambit of family law. Without the doctrine, a woman who lived with a man for forty years and bore his children would have, on his death, no inheritance rights, no Social Security survivor benefits, no community property claim, no standing in probate court. Common-law marriage corrected this by recognizing the substance of marital life rather than its paperwork. The doctrine was historically protective of women in particular, because women bore the larger share of the cost when informal unions ended in death or abandonment.
The movement to abolish common-law marriage has several drivers. Administratively, it produces uncertainty: courts must determine, often after one party has died, whether the relationship met the threshold. The evidentiary problems are severe — the people best positioned to testify about the relationship are the parties themselves, and one of them is usually dead, hostile, or seeking inheritance. The doctrine generates fraud, especially in inheritance and Social Security claims. It also generates inadvertent marriage, where two people who never intended to marry are held to have done so by their conduct, and then must obtain a formal divorce to separate. State legislatures have generally concluded that the costs in litigation and uncertainty outweigh the protective benefits, especially as cohabitation has become socially normalized and other doctrines (palimony, equitable distribution of cohabitant property, parentage presumptions independent of marriage) have filled some of the protective gap.
What survives in the abolitionist states is a residue of historical recognition. A couple who established a common-law marriage in Texas before moving to New York will be treated as married in New York under conflict-of-laws principles — the place-of-celebration rule. A Pennsylvania couple whose union began before 2005 remains married common-law. The decisions of forty years ago continue to produce probate disputes today, and will for decades yet.
The persistence of the doctrine in a handful of states is partly inertia and partly substantive. Colorado, Texas, and Iowa have not abolished common-law marriage because their legislatures have repeatedly declined to do so, often citing the protective function for low-income couples who never formalize. Texas is the most consequential jurisdiction because of its size and because it offers an alternative formal-but-informal procedure: a Declaration of Informal Marriage can be filed with the county clerk, creating documentary proof of common-law marriage without a ceremony.
The institution sits at the seam between status and contract. Marriage is a status — a legal classification with mandatory incidents — while contract is a creature of agreement. Common-law marriage is a status created by conduct rather than by paperwork, which makes it conceptually awkward in a system that increasingly demands clear administrative entry points. As the legal system has built clearer administrative pathways — civil marriage licenses with online application, domestic partnership registries, cohabitation contracts — the case for inferring marriage from conduct has weakened. The doctrine survives where it survives because the legislatures of those states have decided that the protective function is worth the administrative cost, or have not gotten around to deciding otherwise.