No state sets a minimum period of cohabitation for a common law marriage to exist, so the question of how long you have to live together for common law marriage has a short answer: there is no magic number. The “seven-year rule” is folklore. In the handful of states that still recognize common law marriage, what matters is that both partners agree they are married now, live together, and present themselves publicly as spouses. Meet those elements and the marriage can form in months. Miss them and you can share a home for decades without ever being married.
Where the Seven-Year Myth Comes From, and Why It’s Wrong
The belief that living together for seven years, or ten, or any other number automatically creates a marriage has no basis in any state’s law. Courts look at the totality of a couple’s circumstances. Longer cohabitation can strengthen a claim because it gives a couple more opportunity to build the record of a shared life, but duration by itself proves nothing.1Department of Labor. Common-Law Marriage Handbook
One narrow exception deserves a mention so you don’t mistake it for the general rule. New Hampshire’s statute treats two people who have cohabited, acknowledged each other as spouses, and been generally known as married for three years as legally married only after one of them dies, and only for inheritance purposes. It does not create a marriage the couple can rely on during both of their lifetimes.2New Hampshire General Court. New Hampshire Revised Statutes Section 457-39
What Actually Creates a Common Law Marriage
In jurisdictions that recognize common law marriage, three elements must exist at the same time, and both partners must have the legal capacity to marry. If any piece is missing, no marriage exists no matter how long the couple has been together.
A Present Agreement to Be Married
Both partners must agree, right now, that they are married. Planning to get married someday does not count, and an engagement does not count. This is the element courts examine most closely because it separates a committed relationship from a marriage. Direct evidence like a signed written statement is rare, so courts usually infer the agreement from the couple’s behavior.3LII / Legal Information Institute. Common Law Marriage
Holding Yourselves Out as Married
The couple must present themselves to the community as spouses. This is where most contested cases turn. Courts look at whether the couple shared a last name, introduced each other as husband or wife, filed joint tax returns, and listed each other as spouses on insurance, employment, and financial documents. Telling a few close friends is not enough; the broader community has to have understood the couple to be married.1Department of Labor. Common-Law Marriage Handbook
Living Together
Cohabitation is required, but no state sets a minimum duration for it. Simply sharing an address, without the agreement and the public reputation as spouses, does not create a marriage.3LII / Legal Information Institute. Common Law Marriage
Legal Capacity
Both people must be capable of marrying. In most recognizing states that means each is at least 18, mentally competent to consent, and not already married to someone else. An existing marriage that has not been ended by death, divorce, or annulment bars a new common law marriage from forming, exactly as it would bar a ceremonial one.1Department of Labor. Common-Law Marriage Handbook
States Where a Common Law Marriage Can Form
Only a small number of jurisdictions currently allow new common law marriages to be created. Each has its own statutes and case law defining the specifics, but the elements above are consistent across them. The states that fully recognize new common law marriages are:
- Colorado
- Iowa
- Kansas
- Montana
- Oklahoma
- Rhode Island
- Texas
- District of Columbia
Utah works differently. A couple that meets the typical criteria can petition a court or administrative body to formally recognize the relationship as a marriage, but without that order Utah does not treat the couple as married. The petition must be filed while the relationship is ongoing or within one year after one partner’s death.4Utah Legislature. Utah Code Section 30-1-4.5
Several states used to permit common law marriage and no longer do. Marriages formed before the cutoff generally remain valid. Pennsylvania, for example, still recognizes common law marriages formed on or before January 1, 2005.5Pennsylvania General Assembly. Pennsylvania Consolidated Statutes Title 23 Section 1103 Georgia, Ohio, Idaho, Alabama, and South Carolina have each ended the practice on different dates, with older marriages typically grandfathered in.
What Happens if You Move
Once a common law marriage is validly formed in a state that allows it, other states are generally expected to honor it, including states that do not permit new common law marriages within their own borders. That expectation comes from the Full Faith and Credit Clause of the U.S. Constitution.3LII / Legal Information Institute. Common Law Marriage A couple that satisfies the requirements in Colorado and then relocates to New York should still be treated as married in New York even though a New York couple could not form a common law marriage there.
Proving the Marriage Exists
Because time alone does not prove a common law marriage, and because there is no marriage certificate, whoever asserts the marriage carries the burden of proving it. This question usually surfaces during a divorce, an inheritance dispute, or a benefits claim, and the stakes are often significant.1Department of Labor. Common-Law Marriage Handbook
The strongest evidence tends to be documents in which the couple identified themselves as married in contexts where there would be no reason to lie:
- Joint tax returns filed as a married couple.
- Health insurance, life insurance, and retirement account records listing a spouse.
- Joint bank accounts, joint credit cards, and co-signed loans.
- Deeds, mortgages, and vehicle titles held jointly.
- Employment and HR records listing the partner as a spouse or emergency contact.
Testimony from friends, neighbors, and family who understood the couple to be married also carries weight, especially when witnesses can describe specific conduct like introductions and shared social life.1Department of Labor. Common-Law Marriage Handbook
A few states offer a way to skip the evidentiary fight entirely. In Texas, a couple can sign a Declaration of Informal Marriage with the county clerk. Once filed, the declaration is valid proof of marriage for all purposes and eliminates later disputes about whether the marriage existed.
Once It Exists, It’s a Real Marriage
A valid common law marriage carries the same legal weight as a ceremonial one. The IRS treats such couples as married for federal tax purposes, so they file jointly or as married filing separately, and that treatment continues even if the couple later moves to a state that does not recognize common law marriage.6Internal Revenue Service. Revenue Ruling 2013-17 The Social Security Administration recognizes these marriages for spousal and survivor benefits, though it asks for specific proof including signed statements from the spouses and from blood relatives who can speak to the marriage.7Social Security Administration. Code of Federal Regulations Section 404.726 – Evidence of Common-Law Marriage Federal employees can enroll a common law spouse in the Federal Employees Health Benefits program with the appropriate documentation.8Office of Personnel Management. Family Member Eligibility Fact Sheet – Common Law Spouse
Inheritance rights, the presumption of parentage for children born during the marriage, and priority in medical decision-making all follow the same way they would for a ceremonial marriage.
There is one consequence worth flagging because it surprises people. Since a common law marriage is a real marriage, the only way to end it is a formal divorce filed with a court. Separating, moving out, or living apart for years does nothing to dissolve the marriage. Attempting to marry someone else without a divorce creates a bigamous second marriage that can be declared void and, depending on the state, can bring criminal exposure.
If You Live Together in a State That Doesn’t Recognize It
In roughly 40 states, no amount of cohabitation creates marital rights. There is no automatic claim to a partner’s property on separation, no automatic inheritance if a partner dies without a will, and no built-in authority to make medical decisions. Courts may enforce implied agreements about finances or property in some situations, and unjust enrichment claims are sometimes viable when one partner contributed substantially to the other’s property, but these are less reliable than the protections marriage provides. A written cohabitation agreement is the practical tool for couples in those states.