The difference between a common law marriage and a legal marriage is how the marriage comes into existence, not what it’s worth once it exists. A ceremonial (legal) marriage requires a government-issued license and an officiated ceremony. A common law marriage arises from a couple’s genuine agreement to be married, their life together, and their public reputation as spouses. Once either is validly established, the legal rights and obligations are identical. The real differences show up at the front end (how you get married) and the back end (how you prove it later).
How Each Marriage Is Created
A ceremonial marriage follows a set government process. Both partners apply for a marriage license at a local office, usually the county clerk, present ID and proof of age, pay a fee, and after any waiting period, hold a ceremony with a legally authorized officiant and witnesses. The signed license goes back to the issuing office, and the government produces a marriage certificate. That certificate is the proof.
A common law marriage skips the license and ceremony entirely. It’s created by what the couple does and intends. Three elements must all be present:
- A genuine agreement between both partners to be married to each other — not dating, not engaged, not just living together.
- A public reputation as spouses: introducing each other as husband or wife, sharing a last name, filing joint tax returns, listing each other as spouses on insurance and other forms.
- Cohabitation as a married couple would live.
One myth deserves a direct answer. Living together for seven years — or any number of years — does not create a common law marriage on its own. A couple could share a home for thirty years and never be common law married if they never agreed to be married and never held themselves out that way. Intent and reputation are what matter, not a calendar.
Where Common Law Marriage Is Available
Only a small number of U.S. jurisdictions currently allow couples to form a new common law marriage:
- Colorado
- Iowa
- Kansas
- Montana
- Oklahoma
- Rhode Island
- Texas
- Utah
- The District of Columbia
New Hampshire is a partial exception. Under state law, couples who have lived together and been generally known as married for at least three years are deemed legally married only when one partner dies, which effectively limits recognition to inheritance and estate situations.1New Hampshire General Court. New Hampshire Revised Statutes Title XLIII Chapter 457 Section 457-39
Several other states used to recognize common law marriage and later abolished it. South Carolina ended the practice in 2019 through a state supreme court decision. Abolition generally applies only to new common law marriages going forward; if a couple validly established one before the change, that marriage is typically still recognized.
The Rights Are the Same Once Established
The “common law” label sometimes leaves people thinking they have some lesser form of marriage. They don’t. A validly established common law marriage carries the same legal weight as a ceremonial one.2Department of Labor. Common-Law Marriage Handbook Common law spouses have the same rights to:
- Marital property division if the marriage ends in divorce, under the same rules as any other divorce.
- Inheritance, including intestate inheritance when a partner dies without a will.
- Making medical decisions for an incapacitated spouse who has no advance directive, in most states.
- Spousal benefits, including health insurance, pension survivor benefits, and workers’ compensation death benefits.
Children born during a common law marriage are treated the same as children born during a ceremonial one. The birth mother’s spouse is legally presumed to be the child’s parent, which simplifies birth certificates, custody, and everything downstream. Child support obligations are identical regardless of how the parents married.
Taxes, Social Security, and Immigration
If your common law marriage is valid, you are married in the eyes of the IRS. You must file federal taxes as either married filing jointly or married filing separately. Filing as single is incorrect and can trigger penalties or an audit. The IRS has held this position since 1958 and reaffirmed it in 2013, and the recognition follows the couple even into a state that doesn’t allow new common law marriages.3Internal Revenue Service. Revenue Ruling 2013-17
Social Security recognizes common law marriages for spousal and survivor benefits. When you apply on that basis, the agency will typically ask for signed statements from both spouses (or the surviving spouse) and from two blood relatives confirming the marriage; if those aren’t available, other convincing evidence can be considered.4Social Security Administration. Code of Federal Regulations 404.726 – Evidence of Common-Law Marriage
USCIS recognizes a common law marriage as a basis for a spousal visa or naturalization if the marriage was valid where it was formed, and expects documentation such as joint tax returns, shared leases or mortgages, joint bills, and third-party affidavits.5USCIS Policy Manual. Chapter 6 – Spouses
What Happens If You Move
A common law marriage that was validly formed doesn’t dissolve at a state line. Under the Full Faith and Credit Clause, other states generally must honor a marriage that was legal where it was created. Federal agencies apply the same principle: the IRS treats the couple as married based on the law of the state where the marriage was established,3Internal Revenue Service. Revenue Ruling 2013-17 and USCIS does the same for immigration petitions.6USCIS Policy Manual. Chapter 2 – Marriage and Marital Union for Naturalization
The catch is practical, not legal. A court or agency in a non-recognizing state may be less familiar with common law marriage claims and will scrutinize the evidence more closely. Keeping strong documentation from the start helps.
Proving It Later Is the Big Practical Difference
A ceremonial marriage produces a single government-issued certificate. Hand it to a hospital, an insurer, a lender, or a court, and the question is settled.
A common law marriage produces no such document. If the marriage is ever challenged, during a divorce, an inheritance fight, a benefits claim, or an immigration case, the person asserting the marriage has to build a record from circumstantial evidence. Useful proof includes:
- Joint bank or credit accounts
- Deeds or leases in both names
- Federal tax returns filed as married
- Insurance policies naming the partner as a spouse
- Statements from friends, family, or neighbors who understood you to be married
Some couples sign a written affidavit of marriage: a sworn statement declaring that they agreed to be married, when, and where they live. It isn’t a marriage certificate, but it is strong evidence if questions arise later. A few states, including Texas, offer a formal registration process for informal marriages that creates an official record; if it’s available in your state, use it. The paper-trail gap tends to surface at the worst moment — a death, an incapacity, a breakup — so building documentation early is worth the small effort now.
Ending a Common Law Marriage
You cannot end a common law marriage by moving out or agreeing you’re done. Because it is a real marriage, it requires a formal divorce through the court system. There is no such thing as a common law divorce.2Department of Labor. Common-Law Marriage Handbook
The divorce process is the same as for any other marriage: property division, spousal support, and child custody are handled under the same legal standards. Common law spouses can seek alimony on the same basis as ceremonially married ones. If one partner disputes that a valid marriage ever existed, the court first has to decide that question before it can divide anything.
Anyone in a common law marriage who wants to remarry must obtain a divorce decree first. Marrying someone else while a prior common law marriage is undissolved is bigamy, a criminal offense in every state, and the second marriage is legally void.
Living Together Without a Common Law Marriage
One boundary worth spelling out: in most states, simply living together creates no marital rights at all, no matter how long it lasts. If you cohabit in a state that doesn’t recognize common law marriage, or in a recognizing state without meeting all three elements, neither partner automatically has rights to the other’s property, inheritance, insurance benefits, or medical decision-making. Some jurisdictions allow “palimony” claims based on an agreement between partners, but recognition is limited and the burden is heavy. If protections matter to you, the safer path is either a ceremonial marriage or, in a recognizing state, making sure all three elements of a common law marriage are clearly and documentably in place.