Common-Law Marriage Affidavit: How to Prove an Informal Marriage

Disclaimer: This guide explains how a common-law marriage affidavit generally works in the United States. Common-law marriage law varies enormously from state to state, and only a minority of states still allow couples to form one. This article is general information, not legal advice. Confirm the rules in your state and consult a licensed attorney before relying on an affidavit for benefits, taxes, immigration, or any court matter.

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A common-law marriage affidavit, sometimes called a declaration of informal marriage or affidavit of common-law marriage, is a sworn, notarized statement in which two people declare that they are legally married under their state's common-law rules even though they never had a wedding ceremony or obtained a marriage license. It is used to prove a marriage that exists in fact but was never recorded through a formal license, so the couple can access the rights and benefits that come with being married.

What Is Common-Law Marriage?

Common-law marriage is a legally valid marriage created without a license or ceremony. When the requirements are met, the couple is just as married as a couple who had a courthouse wedding, with the same rights to inheritance, benefits, and property, and the same obligation to divorce in order to end it.

The most important thing to understand is that only a limited number of states still let couples newly form a common-law marriage. This is a small minority, the list has shrunk over the years, and it keeps changing. States that have commonly permitted it include:

• Texas (called an informal marriage)
• Colorado
• Utah
• Kansas
• Iowa
• Montana
• New Hampshire (recognized mainly for inheritance after death)
• Rhode Island
• Oklahoma
• The District of Columbia

Treat that list as a starting point only. Because the rules change and the details differ, you must verify your own state's current law before assuming a common-law marriage is available or valid where you live. Many states that do not allow couples to form a common-law marriage will still recognize one that was validly created in a state that does.

The Elements States Typically Require

The exact requirements vary by state, but most states that allow common-law marriage look for three core elements, all of which must usually be present at the same time:

1. Agreement to be married. Both partners presently agree that they are married to each other, not that they merely intend to marry someday.
2. Cohabitation. The couple lives together as spouses. (Length of time alone is rarely enough on its own.)
3. Holding yourselves out publicly as married. The couple presents to friends, family, and the community as a married couple.

| Element | What it generally means | Examples of evidence | | --- | --- | --- | | Agreement to be married | A present, mutual intent to be spouses now | The signed affidavit, statements to others | | Cohabitation | Living together as a couple | Shared lease or deed, shared address | | Holding out as married | Public representation as spouses | Using the same last name, calling each other husband/wife/spouse, joint bank accounts, joint tax returns, naming each other on insurance |

Some states are stricter than this and may add requirements such as legal capacity to marry (both partners of age, single, and competent). Again, verify the specifics where you live.

What a Common-Law Marriage Affidavit Is Used For

The affidavit is the practical tool you use to put a common-law marriage on the record so a third party will honor it. Common uses include:

• Employer and health insurance benefits to add a spouse to a group health plan.
• Social Security for spousal or survivor benefits.
• Taxes to file jointly as a married couple.
• Immigration as one piece of evidence of a bona fide marriage.
• Hospital and medical decisions so a partner can be treated as a spouse.
• Probate to claim inheritance or spousal rights after a partner dies.
• Divorce to establish that a marriage exists before it can be dissolved.

Ending a Common-Law Marriage

A crucial and often misunderstood point: there is no such thing as a common-law divorce. Once a valid common-law marriage exists, the couple is fully married, and the only way to end it is a formal, court-ordered divorce. Moving out or separating does not undo it, which is exactly why accuracy matters when you sign one of these affidavits.

What the Affidavit Includes

While formats differ, a common-law marriage affidavit generally contains:

• Full legal names, dates of birth, and contact details for both partners.
• A clear statement that the two partners agreed to be, and presently are, married to each other.
• The date the marriage began (when the agreement and cohabitation started).
• Confirmation of cohabitation, often with the shared address.
• A description of how the couple has publicly held themselves out as married.
• A statement that both partners had the legal capacity to marry.
• Signatures of both partners, and in many cases one or two witnesses.
• A notary acknowledgment, since the document is sworn under penalty of perjury.

✅ Tip: Attach supporting documents that back up each element, such as a joint lease, joint bank statements, or insurance records naming each other as spouse. The affidavit is stronger when the facts are corroborated.

✅ Tip: Use the actual date the marriage began, not the date you sign the affidavit. The start date can affect benefits, taxes, and inheritance.

Common Mistakes

• ❌ Assuming your state allows it. Most states do not let couples newly form a common-law marriage. Verify first.
• ❌ Confusing intent with agreement. Planning to marry later is not the same as presently being married, which is what most states require.
• ❌ Thinking cohabitation alone creates a marriage. Living together for years does not, by itself, make you common-law married in most states.
• ❌ Leaving out the start date or guessing at it.
• ❌ Filing only one partner's signature when the state or the third party expects both partners and sometimes witnesses.
• ❌ Skipping the notary. An unnotarized affidavit may be rejected.
• ❌ Assuming you can simply walk away. Ending a common-law marriage still requires a formal divorce.

Frequently Asked Questions

Q: Which states allow common-law marriage? A: Only a limited number do, and the list changes over time. States that have commonly permitted it include Texas, Colorado, Utah, Kansas, Iowa, Montana, New Hampshire (mainly for inheritance), Rhode Island, Oklahoma, and the District of Columbia. Always verify your own state's current law.

Q: How do you end a common-law marriage? A: The only way to end a valid common-law marriage is a formal, court-ordered divorce, exactly like a ceremonial marriage. Separating or moving out does not dissolve it.

Q: How long do you have to live together to be common-law married? A: There is usually no fixed number of years. Most states require an agreement to be married, cohabitation, and holding yourselves out as married, all at once; time alone is rarely enough.

Q: Do both partners have to sign the affidavit? A: In most cases yes, and many states or third parties also want one or two witnesses. The document is typically notarized because it is sworn under penalty of perjury.

Q: Will another state recognize my common-law marriage if I move? A: Often yes. Many states that do not allow couples to form a common-law marriage will still recognize one that was validly created in a state that does, but you should confirm how your new state treats it.

How discover.legal Helps

discover.legal helps you build a clear, notary-ready common-law marriage affidavit by guiding you through both partners' information, the agreement to be married, the start date, cohabitation, and how you have publicly held yourselves out as a married couple, then organizing it into a clean sworn statement you can sign and notarize. We are not a law firm and this is not legal advice, so before you rely on the affidavit, confirm that your state recognizes common-law marriage and that your situation meets its requirements.

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