New Mexico
Legal Separation in New Mexico: How NMSA 40-4-3 Works (2026)
Independently fact-checked against primary sources (last audited October 8, 2026). · 3 primary sources cited on this page. How we verify our legal content
New Mexico allows a court-ordered separation without a divorce under NMSA 40-4-3. Spouses who have permanently separated can ask the district court to divide property, decide custody of children or award alimony, "without asking for or obtaining in the proceedings, a dissolution of marriage."
Information last verified on 2026-10-08. This article has not been reviewed by a licensed lawyer.
Jurisdiction scope: This article covers separation proceedings under New Mexico law, mainly NMSA 40-4-3, with the related sections 40-2-4, 40-2-9, 40-3-8, 40-4-1, 40-4-4, 40-4-5, 40-4-20, 45-2-407, 45-2-802 and 45-2-804. It does not cover how alimony or child support amounts are set, custody standards, New Mexico case law, or other states' law. For divorce, see New Mexico divorce laws.
Does New Mexico have legal separation?
Yes, through NMSA 40-4-3, although the section does not use the words "legal separation." It provides:
"Whenever the husband and wife have permanently separated and no longer live or cohabit together as husband and wife, either may institute proceedings in the district court for a division of property, disposition of children or alimony, without asking for or obtaining in the proceedings, a dissolution of marriage."
None of the sections of Article 4 of Chapter 40, 40-4-1 through 40-4-20, is titled legal separation. Other statutes do use the term for this proceeding: NMSA 40-3-8(D) refers to "legal separation under Section 40-4-3," and 40-4-20 and the parentage statute, 40-11A-204, refer to a "decree of separation."
The compiler's annotation to 40-4-3 states: "New Mexico recognizes court-sanctioned separations. Although this section does not expressly state that the court can grant a legal separation, the outcome is the same."
Who can file and on what basis
Either spouse may file. The condition in 40-4-3 is that the spouses "have permanently separated and no longer live or cohabit together as husband and wife."
The section does not require a fault ground such as adultery or cruelty. The case is brought without asking for a divorce.
Residency and where to file
Section 40-4-3 does not itself state a residency period. The six-month residence and domicile rule in NMSA 40-4-5 is written for dissolution of marriage. This page does not state a residency rule for a separation case; a lawyer licensed in New Mexico can confirm how jurisdiction works for one.
Under NMSA 40-4-4, the case may be filed in the county where either spouse resides. The same section gives the court power over the spouses' property statewide: "the court shall have jurisdiction of all property of the parties, wherever located or situated in the state."
What the court can order in a separation case
| Order | Statute |
|---|---|
| Division of property | 40-4-3 |
| Disposition of children | 40-4-3 |
| Alimony | 40-4-3 |
| Jurisdiction over all the parties' property located in New Mexico | 40-4-4 |
| Quasi-community property treated as community property if both spouses are New Mexico domiciliaries | 40-3-8(D) |
Community and quasi-community property. New Mexico is a community property state: "Property acquired during marriage by either husband or wife, or both, is presumed to be community property" (NMSA 40-3-12(A)). Under 40-3-8(D), "quasi-community property shall be treated as community property, if both parties are domiciliaries of New Mexico at the time of the dissolution or legal separation proceeding."
Property the decree does not divide. NMSA 40-4-20(A) provides that "The failure to divide or distribute property on the entry of a decree of dissolution of marriage or of separation shall not affect the property rights of either the husband or wife." Either spouse may later sue to divide it.
Alimony and children. Section 40-4-3 lets the court decide alimony and the disposition of children. For how support and custody are decided, see New Mexico alimony laws, New Mexico child custody laws and New Mexico child support laws.
You stay married after a separation decree
A 40-4-3 case is brought without a dissolution of marriage, so the spouses remain married. The probate code says the same thing for inheritance: under NMSA 45-2-802(A), "A decree of separation that does not terminate the status of spouse is not a divorce for purposes of this section."
That is not the whole rule. Under 45-2-802(B)(3), a spouse who was "a party to a valid proceeding concluded by an order purporting to terminate all marital property rights" is not a surviving spouse for intestacy and related purposes. Section 45-2-804 treats such a proceeding like a divorce for revoking will gifts and beneficiary designations to the spouse, and under 45-2-407(D), unless it provides otherwise, a complete property settlement made in anticipation of separation renounces inheritance and will benefits between the spouses. Spouses with a separation decree or settlement can review their wills and beneficiary designations with a lawyer licensed in New Mexico.
Separation agreements
Spouses can also put separation terms in a contract. NMSA 40-2-4 sets the form:
"All contracts for marriage settlements and contracts for separation, must be in writing, and executed and acknowledged or proved in like manner as a grant of land is required to be executed and acknowledged or proved."
Under NMSA 40-2-9, the spouses' mutual consent is sufficient consideration for an agreement to separate under 40-2-8. Because these contracts fix rights to property and support, a lawyer licensed in New Mexico can explain their effect before either spouse signs.
Moving from separation to divorce
None of the Article 4 sections sets a procedure for converting a separation decree into a divorce. A spouse who wants to end the marriage petitions for dissolution. Under NMSA 40-4-1, "a district court may decree a dissolution of marriage on any of the following grounds: A. incompatibility; B. cruel and inhuman treatment; C. adultery; or D. abandonment."
Divorce residency, procedure and timing are covered on the New Mexico divorce laws page.
Official court resources
The New Mexico Courts self-representation divorce page, the official self-help starting point for family cases, does not discuss legal separation or list a separation form set.
Disclaimer: This article provides general legal information about separation proceedings under New Mexico law, mainly NMSA 40-4-3. It is not legal advice. The information was verified on 2026-10-08, and the law can change. For advice about your situation, consult a lawyer licensed in New Mexico or the New Mexico Courts self-representation resources.
Related
- Legal separation laws in every state
- New Mexico divorce laws
- New Mexico alimony laws
- New Mexico child custody laws
- New Mexico child support laws
Last updated: 2026-10-08.
Frequently Asked Questions
Can you get a legal separation in New Mexico?
Yes. NMSA 40-4-3 lets either spouse, once permanently separated, ask the district court for a division of property, disposition of children or alimony without seeking a dissolution of marriage.
Do you need a reason to get legally separated in New Mexico?
Section 40-4-3 requires that the spouses have permanently separated and no longer live or cohabit together as husband and wife. It does not require a fault ground.
How is property divided in a New Mexico legal separation?
The court can divide property under NMSA 40-4-3. New Mexico presumes property acquired during marriage is community property (40-3-12(A)), and 40-3-8(D) treats quasi-community property as community property when both spouses are New Mexico domiciliaries.
Are you still married after a legal separation in New Mexico?
Yes. A 40-4-3 case is brought without a dissolution of marriage, and NMSA 45-2-802(A) says a separation decree that does not end spouse status is not a divorce for inheritance purposes. But under 45-2-802(B)(3) and 45-2-804, a proceeding concluded by an order purporting to terminate all marital property rights can remove inheritance rights and revoke will gifts to the spouse.
Does a New Mexico separation agreement have to be notarized?
NMSA 40-2-4 requires a separation contract to be in writing and executed and acknowledged or proved in the same way as a grant of land.
Updates
Independently fact-checked against the cited primary sources
The Law Behind This Article
This article rests on the statutory provisions below, held in our own legal record and retrieved from the official source. Tap a section to read the operative text.
New Mexico Statutes Annotated 1978, Chapter 40
§ 40-4-3Proceeding for division of property, disposition of children or alimony without the dissolution of marriage.In force
Whenever the husband and wife have permanently separated and no longer live or cohabit together as husband and wife, either may institute proceedings in the district court for a division of property, disposition of children or alimony, without asking for or obtaining in the proceedings, a dissolution of marriage.
Official text (excerpt) · last checked 2026-07-30 · Read the full text in our law library · Verify at nmonesource.com
§ 40-4-4Venue; jurisdiction over propertyIn force
Any proceeding for the dissolution of marriage, division of property, disposition of children or alimony, as provided for in this chapter, may be instituted in the county where either of the parties resides. In such proceedings, the court shall have jurisdiction of all property of the parties, wherever located or situated in the state.
Official text (excerpt) · last checked 2026-07-30 · Read the full text in our law library · Verify at nmonesource.com
§ 40-4-7Proceedings; spousal support; support of children; division of property.In forcecited in 3 of our articles
A. In any proceeding for the dissolution of marriage, division of property, disposition of children or spousal support, the court may make and enforce by attachment or otherwise an order to restrain the use or disposition of the property of either party or for the control of the children or to provide for the support of either party during the pendency of the proceeding, as in its discretion may seem just and proper. The court may make an order, relative to the expenses of the proceeding, as will ensure either party an efficient preparation and presentation of his case. B. On final hearing, the court: (1) may allow either party such a reasonable portion of the spouse's property or such a reasonable sum of money to be paid by either spouse either in a single sum or in installments, as spousal support as under the circumstances of the case may seem just and proper, including a court award of: (a) rehabilitative spousal support that provides the receiving spouse with education, training, work experience or other forms of rehabilitation that increases the receiving spouse's ability to earn income and become self-supporting.
Official text (excerpt) · last checked 2026-09-07 · Read the full text in our law library · Verify at nmonesource.com
Cited in 104 court opinions in our collectionLatest citing opinion in our collection: 2025
Opinions citing this section in our collection:
- Rhinehart v. Nowlin (New Mexico Court of Appeals 1990, 111 N.M. 319)“…custody, maintenance and education of minor children. See NMSA 1978, § 40-4-7(B), (C) (Repl.Pamp.1989). Specifically,…”
- D'Avignon v. Graham (New Mexico Court of Appeals 1991, 113 N.M. 129)“…tion as to modification. See Spingola v. Spingola; see also NMSA 1978, § 40-4-7 (Repl.Pamp.1989). This discretion inclu…”
- Muse v. Muse (New Mexico Court of Appeals 2008, 145 N.M. 451)“…n an unconstitutional delegation of judicial authority. See NMSA 1978, § 40-4-7(A) (1997) (authorizing the court to “ma…”
Identified automatically from the court opinions citing this section — not a ranking of which case controls.
Also relied on in: New Mexico Spousal Support (Alimony) Laws: How It Works (2026)
§ 40-4-20Failure to divide or distribute property on the entry of a decree of dissolution of marriage or separation; distribution of spousal or child support and determination of paternity when death occurs during proceedings for dissolution of marriage, separation, annulment of marriage or paternity.In force
A. The failure to divide or distribute property on the entry of a decree of dissolution of marriage or of separation shall not affect the property rights of either the husband or wife, and either may subsequently institute and prosecute a suit for division and distribution or with reference to any other matter pertaining thereto that could have been litigated in the original proceeding for dissolution of marriage or separation. B. Upon the filing and service of a petition for dissolution of marriage, separation, annulment, division of property or debts, spousal support, child support or determination of paternity pursuant to the provisions of Chapter 40, Article 4 or 11 [repealed] NMSA 1978, if a party to the action dies during the pendency of the action, but prior to the entry of a decree granting dissolution of marriage, separation, annulment or determination of paternity, the proceedings for the determination, division and distribution of marital property rights and debts, distribution of spousal or child support or determination of paternity shall not abate. The court shall conclude the proceedings as if both parties had survived.
Official text (excerpt) · last checked 2026-07-30 · Read the full text in our law library · Verify at nmonesource.com
§ 40-2-4[Execution of marriage settlement and separation contracts.]In force
All contracts for marriage settlements and contracts for separation, must be in writing, and executed and acknowledged or proved in like manner as a grant of land is required to be executed and acknowledged or proved.
Official text (excerpt) · last checked 2026-07-30 · Read the full text in our law library · Verify at nmonesource.com
Search our full record of US law — 2.1 million sections, every state + federal →
Sources and References
- NMSA 1978, Chapter 40 (Domestic Affairs), official compilation incl. 40-2-4, 40-2-9, 40-3-8, 40-3-12, 40-4-1, 40-4-3, 40-4-4, 40-4-5, 40-4-20, 40-11A-204 and compiler annotations(www.nmonesource.com).gov
- NMSA 1978, Chapter 45 (Uniform Probate Code), sections 45-2-407, 45-2-802 and 45-2-804(www.nmonesource.com).gov
- New Mexico Courts Self-Representation: Divorce(selfrepresentation.nmcourts.gov).gov