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Formal vs informal probate in New Mexico

New Mexico's Probate Code, based on the Uniform Probate Code, offers two ways to open an estate. Informal probate is a paperwork process for estates nobody is fighting over. Formal probate is a court case with notice and a hearing. Most families can use the first; disputes require the second.

Updated October 24, 2026 · Checked against the 2025 New Mexico Statutes

The short version

Informal probateFormal probate
What it isA verified application, granted without a hearingLitigation to decide whether there is a valid will, after notice and a hearing
Where it is filedThe county probate court or the district court (NMSA 45-3-301, 45-1-302.1)The district court; in Albuquerque, the Second Judicial District Court
Notice before the decisionOnly to people who have filed a demand for notice and to any existing personal representative (NMSA 45-3-306)Notice to interested persons of the hearing (NMSA 45-3-403)
Typical useEveryone agrees, and the original will (if any) is availableA will contest, a missing or questionable will, disputes over who should serve, or a need for a binding court order

In Bernalillo County, uncontested cases are usually opened at the Bernalillo County Probate Court.

How informal probate works

An informal case starts with an application to the probate or district court, which the applicant must verify as accurate and complete as far as the applicant knows and believes. Under NMSA 45-3-301 it must include, among other things:

A personal representative cannot be informally appointed until at least 120 hours (five days) after the death (NMSA 45-3-307).

No hearing is held and, apart from people who have filed a demand for notice and any existing personal representative, no advance notice is required. Within 30 days after an informal probate is granted, the applicant must send written information about it to the heirs and devisees, unless a personal representative will be giving them notice instead (NMSA 45-3-306).

How formal probate works

Under NMSA 45-3-401, a formal testacy proceeding is litigation to determine whether the decedent left a valid will. It can be started by a petition asking the court to:

The district court sets a time and place for the hearing, and notice must be given (NMSA 45-3-403). While a formal proceeding is pending, the probate court may not act on any informal application for the same decedent. A personal representative who was already appointed informally must stop making distributions once notified of the formal case, unless the petition asks to confirm that appointment (NMSA 45-3-401).

Because filing a petition to set aside an informal probate is itself enough to start a formal proceeding, an uncontested informal case can become a contested formal one at any point before it is resolved.

Supervised administration

For estates that need ongoing court control, New Mexico also allows supervised administration: a single proceeding in which the district court oversees the whole settlement of the estate until it approves distribution and discharges the personal representative (NMSA 45-3-501). A supervised personal representative answers to the court as well as to the heirs. It is the most protective option and also the slowest.

Letters: the document that lets someone act

To get the powers of a personal representative, a person must be appointed by the district court or probate court, qualify, and be issued letters. Administration of the estate begins when letters are issued (NMSA 45-3-103).

Letters are what banks, title companies, the post office and other institutions ask to see before they will deal with someone on the estate's behalf. Ask the court clerk for several certified copies.

What a personal representative must do

Formal or informal, the personal representative is a fiduciary held to the same standards of care that apply to trustees, and must settle and distribute the estate under the will (if any) and the Probate Code as quickly and efficiently as is consistent with the interests of the estate (NMSA 45-3-703). Key duties and deadlines:

A personal representative is entitled to reasonable compensation, which can be reviewed by the court. See probate costs.

Which path fits your situation

Informal probate usually fits when the family agrees, the original will is available or there clearly is no will, and the person with priority to serve is willing. Formal probate, or a lawyer's advice about it, is worth considering when:

Frequently asked questions

What is the difference between formal and informal probate in New Mexico?

Informal probate is granted on a verified application without a hearing and is meant for uncontested estates. Formal probate is a court proceeding in district court, with notice and a hearing, used when the will or the right to serve is disputed or a binding order is needed.

Can an informal probate become formal?

Yes. Any interested person can petition to set aside an informal probate, which starts a formal proceeding, and a personal representative must then stop making distributions unless the court orders otherwise.

What are letters testamentary or letters of administration?

Letters are the court document showing that a personal representative has been appointed and qualified. Under New Mexico law, administration of an estate begins when letters are issued.

How soon after a death can a personal representative be appointed in New Mexico?

An informal appointment requires at least 120 hours to have passed since the death.

Sources

  1. NMSA 45-3-301, informal probate or appointment: application and contents
  2. NMSA 45-1-302.1, concurrent jurisdiction of district and probate courts over informal probate
  3. NMSA 45-3-306, informal probate: notice requirements
  4. NMSA 45-3-307, informal appointment: 120-hour waiting period
  5. NMSA 45-3-401, formal testacy proceedings: nature and when commenced
  6. NMSA 45-3-403, formal testacy proceeding: hearing and notice
  7. NMSA 45-3-501, supervised administration
  8. NMSA 45-3-103, necessity of appointment and letters for administration
  9. NMSA 45-3-703, general duties of personal representative
  10. NMSA 45-3-705, duty to give information to heirs and devisees
  11. NMSA 45-3-706, duty to prepare an inventory
  12. NMSA 45-3-801, notice to creditors
  13. NMSA 45-3-1003, closing an estate by sworn statement
  14. NMSA 45-3-108, time limits for probate and appointment
  15. NMSA 45-3-719, compensation of personal representative
  16. Bernalillo County Probate Court, contact and forms
  17. Second Judicial District Court, Albuquerque