Skip to content
Oakclause

Common Law Marriage in New Mexico

New Mexico does not allow common law marriages to be formed in the state, but it recognizes one validly formed in another state.

Last checked . General information, not legal advice.

New Mexico at a glance

New common law marriages allowed
No
Requirements
Not available; ceremony required
Under N.M. Stat. 40-1-3, as summarized by the SSA, the civil contract of marriage must be solemnized in a ceremony.

Sources

Last checked

The rules in New Mexico

Can a couple form a common law marriage in New Mexico today?

No. New common law marriages allowed in New Mexico: no.

What are the requirements for a common law marriage in New Mexico?

Requirements in New Mexico: Not available; ceremony required. Under N.M. Stat. 40-1-3, as summarized by the SSA, the civil contract of marriage must be solemnized in a ceremony.

Where do the New Mexico common law marriage laws come from?

The rules above come from N.M. Stat. 40-1-3 and N.M. Stat. 40-1-4. Each source is linked on this page. We last checked them in October 2026.

Good to know

New Mexico recognizes marriages valid where they were contracted, including common law marriages from states that allow them.

What this means in practice

Living together for a long time does not by itself create a marriage. Where common law marriage is allowed, the key question is usually whether both partners agreed to be married and acted that way in public, for example by using the same last name, filing joint tax returns or calling each other husband or wife.

A valid common law marriage can only be ended by divorce or death, just like a licensed marriage. There is no informal way to undo it by moving out. The question of whether a marriage existed often comes up later, in a divorce, an inheritance dispute or a claim for spousal benefits.

Couples who want clear proof of their status can sign a written declaration or affidavit of marriage where state law provides for one, or simply obtain a marriage license. Couples who live together and do not want to be married can sign a cohabitation agreement that sets out how property and expenses are handled.

General information, not legal advice. Laws change, and cities can add their own rules, so check the current statute before you rely on it.