✓ Verified June 2026
This guide covers New Mexico estate planning in plain English — the exact age, witness, and notarization rules, whether a handwritten will is valid, and how to make your will self-proving. All figures are from New Mexico law, verified as of June 2026.
In This New Mexico Guide:
New Mexico Will Requirements at a Glance
Here are the exact rules for making a valid will in New Mexico:
| Minimum age to make a will | 18 |
| Witnesses required | 2 |
| Notarization required | NO — notarization is not required for a New Mexico will to be valid. However, notarization is needed if you want to make the will self-proving under NMSA 45-2-504, which allows the will to be admitted to probate without requiring witness testimony in court. |
| Handwritten (holographic) will allowed | NO — New Mexico does not recognize holographic (handwritten, unwitnessed) wills. Section 45-2-503 of the New Mexico Uniform Probate Code is reserved (left blank), meaning the state deliberately chose not to adopt the UPC provision for holographic wills. All wills must meet the witnessed-will requirements of NMSA 45-2-502. |
| Self-proving affidavit available | YES — under NMSA 45-2-504, a will may be made self-proving at the time of execution or at any time afterward. The testator and the two witnesses must sign a sworn affidavit (or affirmation) before an officer authorized to administer oaths (typically a notary public), who then certifies the signatures under official seal. A self-proving will may be admitted to probate without requiring the witnesses to appear and testify in court. |
| Statutory will form | YES — New Mexico adopted the Uniform Statutory Will Act, found at NMSA Chapter 45, Article 2A (Sections 45-2A-1 through 45-2A-17). Section 45-2A-17 provides the official fill-in-the-blank statutory will form. It is a free, simplified form that lets you name a personal representative, a trustee, and a guardian for minor children. It works best for straightforward estates; it cannot be customized beyond its built-in options. The form is available through the New Mexico Legislature website and legal form providers. |
What a New Mexico Will Does (and Doesn’t Do)
A New Mexico will allows you to name a personal representative (executor) to manage your estate, name a guardian and conservator for minor children, direct how your probate assets are distributed, create a testamentary trust, make specific gifts of personal property (including through a separate written list under NMSA 45-2-513), and express funeral or burial wishes.
What a New Mexico will does NOT control: A New Mexico will does not control assets that pass outside of probate. These include life insurance proceeds or retirement accounts with named beneficiaries, property held in joint tenancy with right of survivorship, assets held in a living trust, payable-on-death (POD) or transfer-on-death (TOD) accounts, and community property with right of survivorship.
Those assets pass directly to the named beneficiary or surviving co-owner regardless of what the will says.
Oral wills in New Mexico: NO — New Mexico does not recognize oral (nuncupative) wills for the general public. A very narrow exception may apply to members of the armed forces on active duty who are in imminent peril of death, but for civilian estate planning purposes oral wills are not valid.
How to Update or Revoke a New Mexico Will
A New Mexico will may be amended by executing a codicil, which must meet the same formalities as the original will (in writing, signed by the testator, signed by two witnesses).
Under NMSA 45-2-507, a will or any part of it may be revoked by a subsequent will or codicil that expressly revokes the prior will, by a subsequent will that is wholly inconsistent with the prior will, or by a revocatory act (burning, tearing, canceling, obliterating,
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or destroying the will) performed by the testator or by another person in the testator’s conscious presence and at the testator’s direction with the intent to revoke.
Other New Mexico will-making rules: New Mexico is a community property state — all property acquired during marriage is presumed to be owned equally by both spouses. A surviving spouse is entitled to their one-half share of community property regardless of what the will says; the will can only dispose of the decedent’s half.
This also provides an important tax benefit: the surviving spouse may receive a full stepped-up basis on all community property (both halves) at the first spouse’s death. New Mexico has no state estate tax, no inheritance tax, and no gift tax.
Under NMSA 45-2-513, a testator may use a separate written statement or list (outside the will itself) to direct gifts of specific items of tangible personal property, as long as the writing is signed by the testator and describes the items and recipients with reasonable certainty.
Under NMSA 45-2-502, witnesses must each sign in the presence of both the testator and of each other, and each must have witnessed the testator’s signing — this is somewhat stricter than the UPC model, which allows acknowledgment of a prior signature.
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Understanding New Mexico Estate Planning
Getting started with New Mexico estate planning is the single best gift you can give your family. A valid New Mexico will lets you decide who inherits, name an executor, and name a guardian for your children — instead of leaving it to a default state formula.
When people look into New Mexico estate planning, the real answer comes down to the state’s execution rules: your age, the number of witnesses, and whether you make it self-proving. If any part of New Mexico estate planning is unclear, your state court’s self-help center can point you to the official forms and resources.
Official New Mexico Sources & Resources
- New Mexico Court Self-Help: https://selfrepresentation.nmcourts.gov/probate/
- New Mexico Wills Statute: https://law.justia.com/codes/new-mexico/chapter-45/article-2/part-5/
- Internal Revenue Service — Estate Tax: irs.gov
- Cornell Legal Information Institute: law.cornell.edu/wex
This New Mexico will guide was last verified against official sources in June 2026. Laws change — verify with your state court or a licensed attorney.
More New Mexico Wills & Probate Guides
- New Mexico Probate Process
- Dying Without a Will in New Mexico
- New Mexico Estate & Inheritance Tax
- New Mexico Small Estate Affidavit
- New Mexico Living Trust
- Probate Cost Calculator
- All 51 States
Disclaimer: This guide is informational only and is not legal or tax advice. Estate, probate, and tax laws change and vary by state and county. Verify current rules and dollar figures with your state’s court, statute, or a licensed attorney or tax professional before acting. For urgent matters like an active probate or a tax deadline, consult a licensed professional in your state right away.