A common law marriage is a legally recognized marriage formed without a license or ceremony, available in roughly ten U.S. jurisdictions. Couples who qualify get the same legal rights and obligations as any other married couple: property division on divorce, spousal benefits, inheritance, tax filing status. The single most important point is that living together, by itself, never creates one. A common law marriage requires deliberate action by both partners, and time alone is not enough.
The Seven-Year Cohabitation Myth
No jurisdiction in the United States has ever required a set number of years of cohabitation to establish a common law marriage. The belief that seven years of living together automatically makes you married is false. No one has traced where the idea came from, but it persists widely enough to affect real decisions.
Some couples assume they are married when they are not, and discover the mistake only when a partner dies or the relationship ends and there are no spousal protections. Others avoid living together out of a fear of stumbling into a marriage by accident. Neither concern reflects the law. Years of cohabitation can serve as evidence of the elements that do matter, but the calendar alone triggers nothing.
The Four Requirements
The specifics vary by jurisdiction, but four elements appear consistently: legal capacity, a present mutual agreement to be married, cohabitation, and a public reputation as spouses. Missing any one of them defeats the claim.
Legal Capacity
Both partners must be legally able to marry. That means both are of legal age (eighteen in most places), mentally competent to understand what marriage means, and not currently married to someone else. A new marriage attempted while one partner is still legally married to another person is bigamous and typically void from the start.
A Present Agreement to Be Married
Both partners must share a present, mutual intent to be married to each other right now. An agreement to marry someday, a general understanding that the relationship is serious, or a trial-run living arrangement does not count. The agreement does not have to be written. Courts accept oral agreements and can infer intent from surrounding circumstances, but the intent has to point at an immediate and permanent commitment.
Cohabitation
The couple has to live together in a shared home. No jurisdiction sets a minimum duration, but the arrangement needs to look like a committed domestic partnership rather than a convenience. Keeping separate residences in different cities weakens the claim. Cohabitation does not need to be perfectly continuous, but it should reflect an ongoing shared life.
Holding Out as Married
This is usually the element that decides disputed cases. The couple must present themselves to the outside world as married. Telling close friends and family is a start, and calling each other “husband” or “wife” in private is not enough on its own. Courts look for a genuine reputation in the broader community: whether neighbors, coworkers, banks, and doctors know the two as a married couple. This public dimension is what separates a common law marriage from a private romantic relationship, and it is where most weak claims collapse.
Where Common Law Marriage Still Exists
The number of jurisdictions that permit new common law marriages has been shrinking for decades. As of 2026, roughly ten allow couples to form one, with recognition coming through case law in several of them rather than a specific statute. A few have unusual rules worth knowing about.
One jurisdiction only recognizes common law marriage for inheritance purposes after a partner dies, and requires at least three years of cohabitation and public reputation as spouses before the death. Another requires couples to petition a court or administrative body to validate the relationship. If the couple separates or a partner dies, that petition has to be filed within one year.
At least six states abolished common law marriage sometime after the 1960s but still honor unions validly formed before their cutoff dates. Those cutoffs range from the late 1950s to as recently as 2019. A union entered before the abolition date in one of these states may still be legally valid, though proving it decades later is difficult, especially after the other partner has died.
How to Prove a Common Law Marriage
Because there is no marriage certificate, proving the marriage depends on a documentary record that shows the couple lived and operated as spouses. A consistent paper trail is what carries the case.
Federal income tax returns filed as “married filing jointly” carry real weight because they are a sworn statement to the IRS about marital status. Joint bank accounts, shared credit lines, and co-signed loans show financial integration. Insurance policies listing a partner as a spouse for health, life, or auto coverage create third-party records that usually require some verification before spousal benefits are extended.
Property documents matter too. A mortgage, deed, or lease listing both partners as a married couple shows the marriage was presented publicly in a significant transaction. A shared last name on government identification, voter registration, or employment records reinforces the public identity. Testimony from friends, family, and community members who understood the couple to be married fills in the rest.
Affidavits of Marriage
A sworn affidavit formalizes the claim in writing. A personal affidavit from one or both partners typically states the date and location where they agreed to become spouses, addresses any prior marriages and how they ended, and describes the couple’s shared life. Separate affidavits from friends, family, or coworkers can corroborate the claim by describing how long the couple has lived together, confirming their reputation in the community, and noting any public announcements of the union. These become especially important when a partner has died and the survivor is trying to establish the marriage for benefits or inheritance.
Federal Recognition
Federal agencies generally respect a common law marriage that was validly formed under the law of the jurisdiction where the couple lives or where the marriage began. That recognition covers taxes, Social Security, and immigration.
Taxes
The IRS treats a valid common law marriage the same as a ceremonial one. Couples in a recognized common law marriage can file jointly even after moving to a jurisdiction that no longer permits new common law unions. The IRS looks to the law of the state where the couple currently lives or where the common law marriage was established to determine validity.
Social Security
A common law spouse can claim Social Security benefits, including survivor benefits. The Social Security Administration wants specific documentation. If both spouses are alive, the preferred evidence is signed statements from both partners plus statements from two blood relatives. If one spouse has died, the SSA asks for a signed statement from the survivor on Form SSA-754 and statements from blood relatives of the deceased on Form SSA-753. The agency may also request corroborating documents like mortgage receipts, insurance policies, or bank records.
Immigration
U.S. Citizenship and Immigration Services recognizes common law marriages for visa petitions and green card sponsorship if the marriage is valid under the law of the jurisdiction where it was formed. USCIS treats this as a fact-specific determination and may request affidavits from the couple and third parties, tax returns, joint utility bills, mortgage documents, and other evidence that the couple lives together, holds themselves out as married, and intends to be married.
Moving to a State That Doesn’t Allow It
A common law marriage validly formed in one jurisdiction generally has to be recognized everywhere else in the country. The Full Faith and Credit Clause of the U.S. Constitution requires each state to respect the public acts, records, and judicial proceedings of every other state, and courts have applied that principle broadly to marriages. The Respect for Marriage Act, signed into federal law in 2022, reinforces the point by requiring all states to recognize any marriage that was valid where it was performed, including marriages between same-sex couples.
Practical friction still happens. A hospital in a non-recognizing jurisdiction may not immediately accept a claim of common law marriage in an emergency. A benefits administrator may not know how to handle an enrollment form without a marriage certificate. These are not legal rejections of the marriage, but they are real problems that a certificate would avoid.
You Can’t Just Walk Away From One
Once a common law marriage is legally established, it is as permanent as a ceremonial one. There is no such thing as a “common law divorce.” The only way to end it is through a formal court proceeding for divorce or dissolution, and that proceeding works exactly like any other divorce: the court divides marital property and debts, decides whether either spouse is entitled to alimony, and issues custody and support orders if there are children.
Skipping the formal divorce creates real problems. Remarrying without first dissolving the common law marriage is bigamy, which can void the new marriage entirely. The unresolved marriage can also surface in probate, with a former common law spouse making claims against an estate years later. If there is any real possibility a past relationship met the requirements, a formal divorce is the only clean way to close it.
Inheritance Is Where This Gets Expensive
The absence of a marriage certificate causes the most damage at death. When a common law spouse dies without a will, the surviving partner has to prove the marriage existed before receiving any inheritance rights. The burden falls entirely on the survivor, and they have to establish all of the required elements at a time when they are grieving and the person who could most easily confirm the agreement is gone.
In recognizing jurisdictions, a proven common law spouse generally has the same intestate inheritance rights as any other surviving spouse. “Proven” carries a lot of weight in that sentence. If the couple never built documentation, if family members of the deceased dispute the relationship, or if the couple lived in a state that does not recognize common law marriage, the survivor can end up with nothing. Establishing the marriage typically requires a court action before the estate can be distributed.
Even couples who are confident in their status should put a few basic documents in place. A will naming the partner as a beneficiary eliminates the need to prove marital status in probate. A healthcare proxy or medical power of attorney gives the partner clear authority to make medical decisions and sidesteps a hospital that questions the marriage. A durable power of attorney for finances lets the partner manage accounts and property if the other becomes incapacitated. These cost far less than a probate fight, and they work regardless of whether the jurisdiction recognizes common law marriage at all.