How to File for Child Custody in New Mexico: Forms and Service

To file for child custody in New Mexico, you submit a petition in the District Court for the county where you or your child lives, along with a jurisdiction affidavit and a proposed parenting plan, pay the filing fee (about $137) or request a waiver, and then formally serve the other parent. Most cases go through mediation before a judge holds a contested hearing. Here is what each step requires and the order things happen in.

First, Confirm New Mexico Has Jurisdiction

A New Mexico court can only make an initial custody decision if the state qualifies as your child’s “home state” under the Uniform Child-Custody Jurisdiction and Enforcement Act. Home state means the child has lived in New Mexico for at least six consecutive months immediately before you file.¹ For an infant younger than six months, the home state is wherever the child has lived since birth.

If a custody case is already open in another state, New Mexico must generally stay or dismiss its own case unless the other state gives up jurisdiction.²

There is a narrow emergency exception. If a child is physically in New Mexico and has been abandoned or is being subjected to or threatened with mistreatment or abuse (including threats against a sibling or parent), a New Mexico court can take temporary emergency jurisdiction even without meeting the six-month rule.³ Outside that emergency, the six-month residency threshold is the only standard route in.

Gather Your Information Before You Start

Missing details are the most common reason petitions get rejected or delayed. Before you touch a form, pull together:

Full legal names and current addresses for both parents.
Your child’s full legal name and date of birth.
A five-year residential history for the child: every address where the child has lived during the past five years, plus the names and current addresses of the adults who lived at each place. The UCCJEA requires this, and it is one of the most common reasons petitions bounce back for corrections.⁴
Any existing custody, child support, or protective orders involving the child from any jurisdiction.
Any pending proceedings that could affect custody, including domestic violence cases, termination of parental rights, or adoption matters.

If you’ve moved several times, sit down and reconstruct the timeline in writing before you open the form.

The Forms You Have to File

Official forms are available at any District Court clerk’s office and on the New Mexico Courts website. Three documents do most of the work.

Petition for Custody and Support. This is the formal request. It identifies both parents, the child, and the custody and support you’re asking the court to order.

Custody Jurisdiction Affidavit. Required under NMSA § 40-10A-209, this sworn statement lays out the child’s residential history, confirms whether any other custody proceedings are pending anywhere, and establishes that New Mexico has jurisdiction.⁴

Parenting Plan. New Mexico expects a written plan that spells out how parents will share time and make decisions. A workable plan covers the regular weekly schedule, holiday and school-vacation rotations, transportation logistics, and how the parents will handle disagreements about healthcare, education, and activities.⁵ Vague language about “splitting time fairly” won’t hold up. Be specific.

Fill out every section on every form. Blank fields and inconsistencies between documents give the clerk grounds to send you back.

Where to File and What It Costs

Take your originals and copies to the District Court clerk’s office in the county where you or your child lives. The clerk stamps in the filing date and assigns a case number. That number goes on every future document you file.

Filing a new domestic case costs $137 in the First Judicial District, and fees can vary slightly by district.⁶ If you can’t afford the fee, submit an Application for Free Process and Affidavit of Indigency (Form 4-222). It asks the court to waive the fee based on your income, employment, public assistance, assets, and monthly expenses.⁷

Serve the Other Parent

Filing the petition doesn’t notify the other parent. You have to formally deliver copies of the filed petition and a summons, which tells them they have 30 days to file a written response. New Mexico Rule 1-004 governs the process.⁸

Anyone 18 or older who is not a party to the case can serve the papers, which means you cannot hand them to the other parent yourself.⁸ Most people hire a private process server or arrange service through a sheriff’s deputy. After delivery, the server completes a sworn proof-of-service return and files it with the court. Until that return is on file, the court has no record that the other parent knows the case exists.

When You Cannot Locate the Other Parent

If you’ve made a genuine effort and still can’t find the other parent, ask the court for permission to serve by publication. You file a motion with an affidavit explaining why normal service isn’t possible. If the judge approves, you publish a notice in a newspaper of general circulation in the county where the case is pending, once a week for three consecutive weeks.⁸ Service is complete on the date of the last publication. The notice must include the case caption, the respondent’s name, your attorney’s contact information, and a warning that a default judgment may be entered if no response is filed.

What Happens Right After You File

The Temporary Domestic Order

The court issues a Temporary Domestic Order (TDO) when the petition is filed. It binds you the moment you file and binds the other parent once they are served. While the case is pending:

Neither parent may take the child out of New Mexico without a court order or the other parent’s written consent.
Neither parent may change the child’s school, doctor, dentist, childcare, religion, or recreational activities.
Both parents keep regular contact with the child by phone and in person.
Neither parent may run up unnecessary debts, sell or hide property, drain accounts, cancel insurance, or change life insurance beneficiaries.
Neither parent may force the other out of the family home without a court order.

Courts take TDO violations seriously.⁹

The 30-Day Response Window

The other parent has 30 calendar days after service to file a written response. The clock starts on the date of service, not the date stamped on the court’s copy of the petition.¹⁰ If no response is filed in that window, you can ask the court for a default judgment based on what you requested in the petition.

Mediation

If both parents participate, the court will likely refer you to mediation under Rule 1-125. Programs vary by district; the court can order parents to attend an information session, meet with a counselor, or take part in formal mediation.¹¹ If mediation produces an agreement, both parents sign a stipulated order for the judge to approve. If it doesn’t, the case moves to a contested hearing where each side presents evidence and testimony and the judge issues a binding custody order weighed against the child’s best interests under NMSA § 40-4-9.¹²

Financial Disclosures for the Support Piece

Custody filings in New Mexico almost always include child support, and both parents must exchange detailed financial information under Rule 1-123. Required disclosures include federal and state tax returns, W-2s, 1099s, pay stubs from the preceding four months, childcare cost documentation, and health insurance premium statements.¹³ The court applies the statutory guidelines under NMSA § 40-4-11.1 to arrive at a presumptive support figure; a judge who deviates must state the reasons on the record.¹⁴ Have your income documents ready when you file so you’re not scrambling later.

A Note on Custody Types

Your petition asks for a specific arrangement, so it helps to know the terms before you fill in the form. New Mexico recognizes legal custody (who makes major decisions about education, healthcare, and religion) and physical custody (where the child lives day to day). These can be split independently. Joint custody means both parents share custody, though not necessarily on an equal time or expense split; each parent gets significant, well-defined periods of responsibility.⁵ Sole custody puts all decision-making and primary physical responsibility with one parent. When custody is being established for the first time, New Mexico law presumes joint custody is in the child’s best interests.

If You Already Have a Custody Order

Filing for custody is a different process from modifying an existing order. If a New Mexico court has already issued a custody order in your case, you don’t start over with a new petition. You file a motion to modify in the same court, and you have to show a substantial and material change in circumstances before the judge will revisit what’s in place. Routine disagreements or minor scheduling conflicts don’t meet that standard.

1
Justia. New Mexico Statutes Section 40-10A-201 – Initial Child-Custody Jurisdiction
2
Justia. New Mexico Statutes Section 40-10A-206 – Simultaneous Proceedings
3
Justia. New Mexico Statutes Section 40-10A-204 – Temporary Emergency Jurisdiction
4
Justia. New Mexico Statutes Section 40-10A-209 – Information to Be Submitted to Court
5
Justia. New Mexico Statutes Section 40-4-9.1 – Joint Custody Standards for Determination Parenting Plan
6
First Judicial District. Fees, Costs and Filing
7
New Mexico Courts. Application for Free Process and Affidavit of Indigency
8
New Mexico Supreme Court. Rule 1-004 NMRA – Process
9
New Mexico Courts. Temporary Domestic Order
10
New Mexico Second Judicial District Court. Procedure for the Response to Petition for Dissolution of Marriage
11
New Mexico Courts. New Mexico Supreme Court Rule 1-125 – Domestic Relations Mediation Act Programs
12
Justia. New Mexico Statutes Section 40-4-9 – Standards for the Determination of Child Custody Hearing
13
New Mexico Courts. Notice of Compliance with Rule 1-123 NMRA
14
New Mexico Second Judicial District Court. Child Support Guidelines – Section 40-4-11.1