A common law spouse is entitled to the same legal rights as a ceremonially married spouse: property division at divorce, spousal support, inheritance, Social Security survivor and spousal benefits, joint federal tax filing, and in many cases employer-sponsored health and pension benefits. The catch is that only a handful of states still allow new common law marriages to form, and the person claiming the marriage has to prove it exists. Clear those two hurdles and the law treats your marriage identically to one that started with a license and a ceremony.
Property and Debt
Once a common law marriage is established, every asset and debt acquired during the marriage is treated exactly as it would be in a ceremonial marriage. If the relationship ends, how that property gets divided depends on whether your state follows community property rules or equitable distribution rules.
In community property states, assets and debts acquired during the marriage are generally considered jointly owned and get divided between the spouses. In equitable distribution states, which make up the majority, a court divides marital property in a way it considers fair. Fair does not necessarily mean 50/50. Earning capacity, length of the marriage, and each spouse’s contributions to the household all factor in.
Debt follows the same framework. In community property jurisdictions, both spouses can be held responsible for debts either one incurred during the marriage. In equitable distribution states, debt typically stays with the spouse whose name is on the obligation, though a court can allocate it differently as part of a divorce.
The real trap is for couples who separate informally without divorcing. Because a common law marriage does not require paperwork to start, some couples assume they can end it just by moving apart. They cannot, and in the meantime one partner may be racking up debts or selling assets the other has a legal claim to.
Spousal Support
A court can award spousal support when a common law marriage ends, using the same criteria it applies in any divorce: length of the relationship, each partner’s financial needs and earning capacity, the standard of living during the marriage, and whether one partner sacrificed career opportunities for the household.
The practical difficulty is the start date. There is no wedding on record, so the court must determine when the marriage actually began. That date directly affects how long the marriage lasted and how much support, if any, is appropriate. Documentation of when the couple started holding themselves out as married becomes central.
Inheritance
A surviving common law spouse has the same inheritance rights as any other surviving spouse. If your partner dies without a will, your state’s intestate succession laws determine your share. In most states a surviving spouse receives the largest portion of the estate, and if the deceased had no children, the spouse often inherits everything.
Even when a will exists, most states give a surviving spouse the right to claim an elective share, a minimum percentage of the estate regardless of what the will says. This protection extends to common law spouses whose marriage can be proven.
Inheritance is also where common law claims most often get fought. When a surviving partner shows up to claim a share, other heirs frequently challenge whether the marriage was real. The surviving partner then has to prove the marriage existed at a time when the one person who could most easily confirm it is gone.
Social Security Benefits
The Social Security Administration recognizes a common law marriage as long as it was valid under the law of the state where it was formed.1Social Security Administration. POMS GN 00305.060 – Common-Law Marriage – General A recognized common law spouse can receive survivor benefits, spousal retirement benefits, and lump-sum death benefits on the same terms as a ceremonially married spouse.
To verify the marriage, the SSA asks for signed statements. If both spouses are alive, each partner provides a signed statement along with statements from two blood relatives. If one spouse has died, the surviving spouse provides a statement along with statements from two blood relatives of the deceased. The SSA can also accept other convincing evidence if these preferred documents are not available.2Social Security Administration. Code of Federal Regulations 404.726
One point that surprises people: the SSA evaluates the marriage based on the laws of the state where it was formed, not where you live now. A valid common law marriage established in Kansas is still honored by the SSA after a move to a state that does not recognize common law marriage.3Social Security Administration. POMS GN 00305.075 – State Laws on Validity of Common-Law Non-Ceremonial Marriages
Federal Taxes
The IRS treats a valid common law marriage exactly like a ceremonial marriage for all federal tax purposes. If your common law marriage is recognized under state law, you can file a joint federal return. Federal regulations confirm that a marriage recognized by the state where it was entered is recognized for federal tax purposes regardless of where the couple later lives.4Federal Register. Definition of Terms Relating to Marital Status
Joint filing typically lowers the combined tax bill for couples where one partner earns significantly more than the other, because of the wider joint brackets. Common law spouses also qualify for the unlimited marital deduction for estate and gift tax purposes, which allows unlimited asset transfers to a spouse during life or at death without triggering federal estate or gift taxes.5Internal Revenue Service. Frequently Asked Questions on Estate Taxes
Filing status at the state level is separate. If you now live in a state that does not recognize common law marriage, state tax treatment may differ. Check your state’s rules before filing a joint state return.6Internal Revenue Service. Filing Status
Employer Health Insurance and Pensions
Whether your common law spouse can get on your employer’s health insurance or pension plan depends on the type of plan and the employer’s own policies. Federal employees enrolled in the Federal Employees Health Benefits Program can cover a common law spouse if the marriage is valid under the law of the state where it was established. The employing office decides what evidence is acceptable to prove the marriage.7U.S. Office of Personnel Management. Family Member Eligibility Fact Sheet – Spouse and Common Law Spouse
Federal rules require private-sector pension plans to provide survivor annuity benefits to the surviving spouse of a vested participant. The terms “spouse” and “marriage” include common law marriages recognized by state law. They exclude domestic partnerships and civil unions, even those carrying identical state-level rights.8Pension Benefit Guaranty Corporation. Domestic Partner Not Entitled to QPSA Benefit
Private employers who are not subject to those federal rules have more discretion. Some voluntarily extend benefits to common law spouses; others require a marriage certificate and will not accept alternative proof. If your employer’s benefits matter to you, ask HR what documentation they need and whether they recognize common law marriage at all.
Which States Allow Common Law Marriage
All of the entitlements above depend on having a valid marriage in the first place. The states that currently allow new common law marriages to form are Colorado, Iowa, Kansas, Montana, Oklahoma, Rhode Island, Texas, and the District of Columbia. Utah is sometimes listed, but it works differently: a court or administrative order must officially validate the relationship before the state treats it as a marriage. New Hampshire recognizes common law marriage only for inheritance purposes after one partner dies.3Social Security Administration. POMS GN 00305.075 – State Laws on Validity of Common-Law Non-Ceremonial Marriages
Several other states permitted common law marriage in the past but have since abolished it, including Alabama (2017), South Carolina (2019), and Pennsylvania (2005). A common law marriage validly formed in one of those states before the cutoff date may still be recognized.
Even in states that do not allow common law marriage to form, a union validly created in a recognizing state is generally honored. This flows from the constitutional requirement that states give full faith and credit to the acts of other states.1Social Security Administration. POMS GN 00305.060 – Common-Law Marriage – General A common law marriage established in Colorado continues to be a marriage after the couple moves to California.
What Makes the Marriage Valid
Elements vary by state, but most recognizing jurisdictions require all of the following at the same time:
- Mutual agreement to be married right now, not at some vague future date.
- Cohabitation as a married couple.
- Public representation as married, including using the same last name, referring to each other as spouses, holding joint accounts, or listing each other as a spouse on official forms.
- Legal capacity: both partners of legal age, mentally competent, and not already married to someone else.
A widespread myth is that living together for a specific number of years, often cited as seven, automatically creates a common law marriage. No state has ever used a time requirement. A couple could live together for decades and never form a common law marriage without the intent to be married and the public holding-out.
Simply cohabiting, without meeting these elements, creates no legal marriage no matter how long the relationship lasts. A registered domestic partnership is also different: it involves a formal registration process through a state or local government, while common law marriage forms through the couple’s conduct and intent. Federal agencies, including the IRS, the Social Security Administration, and the Pension Benefit Guaranty Corporation, recognize marriages (including valid common law marriages) but do not extend spousal benefits to domestic partnerships or civil unions that are not denominated as marriages under state law.8Pension Benefit Guaranty Corporation. Domestic Partner Not Entitled to QPSA Benefit
Proving the Marriage
None of the entitlements above matter if you cannot prove the marriage existed. The person claiming a common law marriage bears the burden of proof, and courts scrutinize these claims closely.9Department of Labor. Common-Law Marriage Handbook Most failed claims fail here. Couples who genuinely considered themselves married often have little documentation to show for it.
Evidence that strengthens a claim includes:
- Joint tax returns, which involve a sworn statement to a federal agency.
- Joint bank accounts, shared credit cards, or mortgages listing both partners.
- Insurance and beneficiary forms naming your partner as a spouse.
- Statements from friends, family, coworkers, or neighbors who observed the couple holding themselves out as married.
- Using the same last name, introducing each other as husband or wife, or signing documents as a married couple.
Texas offers a formal shortcut: couples can sign a declaration of informal marriage with the county clerk, which creates an official record of the marriage without a ceremony and carries legal weight equivalent to a marriage license. Not every recognizing state has this option, so most common law couples build their case from the evidence above.
If you believe you are in a common law marriage, the smartest move is to start creating a paper trail now, not after a crisis forces the question.
How a Common Law Marriage Ends
A common law marriage may form without paperwork, but it cannot end without it. You must go through a formal divorce to dissolve a valid common law marriage, just like any other married couple. Moving apart or agreeing to split up does not end the marriage in the eyes of the law.
The divorce covers the same issues as any other: property division, debt allocation, spousal support, and if there are children, custody and child support. If you move to a state that does not recognize new common law marriages, you still need a divorce there, because all states recognize common law marriages validly formed elsewhere.
Skipping the divorce creates real problems. As long as the marriage is legally intact, you remain responsible for each other’s debts in community property states, you cannot legally marry someone else, and any new relationship could technically constitute bigamy. People who drift apart without divorcing sometimes find out years later that their common law spouse has a legal claim to retirement accounts, property, or survivor benefits they assumed were theirs alone.
If You Do Not Qualify
If you live in a state that does not allow common law marriage, or you do not meet the requirements, you have no automatic right to property division, spousal support, or inheritance when the relationship ends. This is true regardless of how long you lived together or how intertwined your finances became. The law draws a hard line between married and unmarried couples.
An unmarried partner’s property rights are determined almost entirely by how assets are titled. If the house is in your partner’s name, it is your partner’s house, even if you helped pay the mortgage for 15 years. The same logic applies to bank accounts, vehicles, and retirement savings.
A written cohabitation agreement, sometimes called a living-together agreement, can spell out how property and support will be handled if the relationship ends. These agreements are generally enforceable when properly drafted and signed voluntarily, but they do not create the automatic protections that come with marriage, and they have no effect on federal benefits like Social Security, which require an actual marriage.
Some states recognize contractual claims between unmarried partners, sometimes informally called palimony, where one partner can seek support based on an express or implied agreement. These claims are difficult to win and are not available in every state. For most unmarried couples, a cohabitation agreement drafted with an attorney is the most reliable form of protection.