A common law marriage is a legally recognized marriage that forms without a license, ceremony, or government filing when a couple in a state that allows it agrees they are married, lives together, and holds themselves out to the public as spouses. Only a handful of states still allow new ones, but where it exists, a common law marriage carries the same legal weight as any other marriage — the same rights to property and inheritance, the same tax status, the same access to Social Security, and the same requirement of a formal divorce to end it.
What Makes a Common Law Marriage Valid
Every recognizing state looks for roughly the same three elements. No state sets a minimum number of years you must live together, and having children together is not part of the test.
A Present Agreement to Be Married
Both people must genuinely agree, between themselves, that they are married right now. Plans to marry someday do not count. Courts look for a present-tense agreement, shown through things like telling each other “we’re married,” signing documents as a married couple, or filing joint tax returns. The agreement does not have to be written, but an unwritten one is harder to prove if a partner later denies it existed.
Living Together
The couple must actually share a home in a way that resembles married life: a shared residence, joint household responsibilities, a life run together. A shared lease, utilities in both names, or a jointly owned home all help. Cohabitation by itself, no matter how long it lasts, does not create a marriage without the other two elements.
Holding Out as Married
The couple must present themselves publicly as spouses. That means introducing each other as husband, wife, or spouse, sharing a last name, wearing rings, listing each other as spouses on insurance or employment paperwork, and being known as married by the people around you. This public dimension is what separates a common law marriage from a private long-term relationship.
Legal Capacity
Both people also have to be legally able to marry. In most states that recognize common law marriage, that means each person is at least 18, mentally competent to consent, and not already married to someone else. An existing undissolved marriage makes any later marriage void. If the earlier marriage ends through divorce or death, some states let the couple’s common law marriage take effect from that point forward as long as they keep living together and holding out as married; others require a fresh agreement once the impediment is gone.
Which States Recognize It
You can currently form a new common law marriage in Colorado, Iowa, Kansas, Montana, Oklahoma, Rhode Island, and Texas, and in the District of Columbia. Utah also permits it, but requires a court or administrative order to validate the marriage, and the petition has to be filed during the relationship or within one year after it ends.
Several states stopped allowing new common law marriages after a cutoff date but still recognize ones formed before it: Georgia (January 1, 1997), Pennsylvania (January 1, 2005), Alabama (January 1, 2017), and South Carolina (July 24, 2019). Idaho, Ohio, Indiana, and Florida have older cutoffs going back decades. If your relationship began before the cutoff and met that state’s requirements at the time, the marriage remains valid.
New Hampshire is a category of its own. A couple who lived together and were generally known as married for at least three years are treated as legally married, but only after one of them dies. That effectively limits recognition to inheritance and estate matters rather than creating a marriage the couple can rely on while both are alive.
States not on any of these lists do not create common law marriages at all. Living together for years in, say, California or New York does not produce one no matter what evidence you gather.
Proving the Marriage Exists
Because no marriage certificate was ever issued, the person claiming the marriage has to prove it. This comes up in divorce, inheritance disputes, insurance claims, and benefit applications. Courts and agencies weigh the whole picture rather than any single document. Useful evidence includes:
- Joint tax returns filed as married
- Joint bank accounts, credit cards, or mortgages
- Deeds, leases, or titles listing both partners
- Insurance, retirement, or employment records naming your partner as a spouse
- A shared surname on driver’s licenses, passports, or other official documents
- Testimony from friends, family, or community members who understood you to be married
- Sworn affidavits from both partners or people who know you
One shared bank account will rarely do it. Several categories together — joint returns, shared property, years of introducing each other as spouses, corroborating testimony — start to look convincing. Couples who want to head off future disputes can sign a written agreement acknowledging the marriage. In Texas, they can also file a declaration of informal marriage with the county clerk, which creates a clean paper record.
Property, Debt, and Support
Once the marriage is established, property rights work the same as in a ceremonial marriage. In a community property state like Texas, most of what either spouse acquires during the marriage is owned equally, no matter whose name is on the title. In an equitable distribution state, courts split marital property based on fairness, weighing income, contributions, and the length of the marriage.
Debt tracks similar lines. In equitable distribution states, a debt one spouse takes on alone is generally that spouse’s problem, unless it was for a joint purpose or a family necessity, or the other spouse cosigned. Community property states sweep more debt into the shared column, so both spouses may be on the hook for obligations taken on during the marriage even when only one name is on the account.
If the relationship ends, either spouse can ask a court for alimony or spousal support based on the usual factors — length of the marriage, each spouse’s earning capacity, the standard of living during the marriage, whether one spouse gave up career opportunities for the household. The catch runs through everything in this section: none of it is available to a spouse who cannot first prove the marriage existed. That is the most common way a lack of documentation causes real financial harm, when the economically dependent partner walks away with nothing because they cannot show the marriage was real.
Taxes
The IRS treats a common law marriage as valid for federal tax purposes if it is valid under the laws of the state where it was formed, no matter where the couple lives now. If you are in a recognized common law marriage on December 31 of the tax year, the IRS considers you married for the entire year.1Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
That means you must file as Married Filing Jointly or Married Filing Separately. Filing as single is not an option. Filing jointly often produces a lower combined bill, but both married options are open. What is closed off is treating the marriage as if it doesn’t exist.1Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information Filing single when you are legally married under common law can lead to recalculated taxes, disallowed credits, interest, and accuracy-related penalties.
Social Security and Federal Benefits
A common law spouse qualifies for the same Social Security benefits as any other spouse, including spousal benefits during the worker’s lifetime and survivor benefits after death. The Social Security Administration decides whether a valid marriage exists using the law of the state where the couple lived when they claimed to have married, or, for survivor claims, where the worker was living at death.2Social Security Administration. Development of Common-Law (Non-Ceremonial) Marriages
The SSA runs its own documentation process. Both spouses (or the survivor) complete sworn Statements of Marital Relationship, and the agency also requires signed statements from blood relatives, plus corroborating records like mortgage or rent receipts, insurance policies, medical records, or bank records showing the couple lived as a married unit.3Social Security Administration. SSA Handbook 1717 – Evidence of Common-Law Marriage Federal benefits tied to marital status, including FMLA leave to care for a spouse and COBRA continuation coverage, apply the same way, provided you can show the marriage is valid under state law.
Health Insurance and Employer Benefits
Many employers in recognizing states let an employee add a common law spouse to a health plan, but they almost always want proof first. Typical requirements are a signed affidavit, joint tax returns, shared bank or mortgage documents, and any other evidence the state’s law calls for. Plans set their own verification standards, so it is worth checking with human resources before open enrollment rather than during it.
Inheritance and Children
A surviving common law spouse has the same inheritance rights as any other spouse. If your partner dies without a will, state intestacy law entitles you to a share of the estate, with the exact share depending on which other relatives survive. The hard part is proving the marriage when one of the two people who could confirm it is gone. Probate courts look for the same kinds of evidence used elsewhere: joint returns, shared accounts, insurance and employment records, testimony, a shared surname. Without strong evidence, a court can conclude no marriage existed, leaving the surviving partner with nothing.
This is why estate planning matters more, not less, for common law couples. A will naming your partner as a spouse, a trust, and up-to-date beneficiary designations on retirement accounts and life insurance policies protect your partner regardless of how a court later views the marriage.
Children born during a valid common law marriage carry the same legal presumption of paternity as children born in a ceremonial one. That presumption affects custody, child support, inheritance, and eligibility for benefits like Social Security survivor payments. If the marriage is later disputed or never firmly established, paternity may have to be proven separately through a voluntary acknowledgment or a court order.
If You Move to Another State
The general rule is that a marriage valid where it was formed is valid everywhere. A common law marriage created in Colorado is normally still a marriage after a move to a state that does not allow new common law marriages. Courts usually reach that result through longstanding choice-of-law principles, sometimes citing the Constitution’s Full Faith and Credit Clause as additional support.
A narrow public policy exception exists in a few courts, but it is rarely applied to common law marriages. The practical takeaway is to keep your documentation with you when you move, because you may end up proving the marriage in a state that has no framework for creating one.
How a Common Law Marriage Ends
This is where couples make the most expensive mistake. Because no license or ceremony created the marriage, people assume they can end it by moving out. They cannot. A common law marriage is a real marriage, and ending it requires a real divorce, filed with a court and processed through the legal system, with formal orders on property, debt, support, and any children.
Walking away without a divorce leaves both people legally married. Neither can legally marry anyone else without committing bigamy, and a former partner can surface years later to claim a share of assets acquired since the split. Court filing fees for a divorce petition generally run between $150 and $350, with waivers available for people who cannot afford them. That is a small price compared to staying technically married to someone you no longer live with.
The divorce itself works the same as any other. One spouse files, the other responds, and the court resolves the disputes. If one partner claims the marriage and the other denies it, the court first has to decide whether a valid common law marriage existed before it can divide anything. Having your evidence organized before that hearing is the difference between a straightforward divorce and a long, expensive fight over whether you were ever married at all.