New Mexico: Revocable Trust Amendment Requirements
The short answer
New Mexico generally lets the settlor amend unless the trust expressly says it is irrevocable, but that default does not cover a trust created under an instrument executed before July 1, 2003. The settlor may substantially comply with the trust's method or, unless it is expressly exclusive, use a qualifying later will or codicil or another method manifesting clear and convincing evidence of intent. Will-level capacity, property-based co-settlor authority, express agent authority, court-approved conservator or fallback guardian action, prompt notice to other settlors, and a trustee no-knowledge safe harbor also apply.
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This is the general rule in New Mexico. Ask about your specific facts and see which parts of current New Mexico law apply, with citations to the statutes.
| Governing law and revocability presumption | NMSA 1978 §§ 46A-6-601–602; revocable unless expressly irrevocable. Default excludes trusts under instruments executed before July 1, 2003 |
|---|---|
| Who may amend or restate | Settlor; expressly authorized agent; court-approved conservator or, if none appointed, guardian. Restatement is comprehensive amendment |
| Trust method and exclusivity | Substantial compliance with trust method; alternatives remain unless the method is expressly made exclusive (§ 46A-6-602(C)) |
| Alternative statutory method | If method absent/nonexclusive: later will/codicil expressly referring to trust or specifically devising affected property, or any other clear-and-convincing-intent method |
| Signature, witnesses, notary, and delivery | Trust method controls. Ordinary NM witnessed will: writing, testator/directed signature, and at least two witnesses (§ 45-2-502). Other-method branch adds no universal signature, notary, or delivery rule |
| Capacity standard | Same capacity as making a will (§ 46A-6-601); no separate amendment-only cognitive formula |
| Multiple settlors and contributed property | Community property: both spouses jointly amend. Other property: each settlor controls contributed portion. Trustee promptly notifies other settlors when fewer than all act (§ 46A-6-602(B)) |
| Agent, guardian, conservator, and court authority | Agent authority must be express in trust or POA. Conservator, or guardian if none appointed, needs approval of supervising court (§ 46A-6-602(E)–(F)) |
| Effective time, notice, and trustee protection | No universal effective-on-signing, delivery, or acceptance rule stated. Prompt co-settlor notice; trustee without knowledge is protected (§ 46A-6-602(B), (G)) |
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Requirements one by one
Governing law and revocability presumption
NMSA 1978 § 46A-6-602(A) permits the settlor to amend unless the trust terms
expressly provide that the trust is irrevocable. That default does not apply to
a trust created under an instrument executed before July 1, 2003. The
instrument's date and terms therefore come first.
Who may amend or restate
The settlor ordinarily holds the power. Section 46A-6-602 also recognizes an
agent with the required express authority and a court-supervised conservator or
fallback guardian acting through the statutory approval route. Trustee or
beneficiary status alone does not appear in the section as amendment authority.
New Mexico states no separate complete-restatement procedure. Replacing all
operative terms is a comprehensive amendment subject to the same authority,
method, capacity, and co-settlor rules.
Trust method and exclusivity
The settlor may substantially comply with a method supplied by the trust. If
the trust provides no method, or if its method is not expressly made exclusive,
the alternatives in § 46A-6-602(C)(2) remain available.
A stated method does not close the statutory routes by itself. Express
exclusivity is the dividing line in subsection C.
Alternative statutory method
One alternative is a later will or codicil that expressly refers to the trust or
specifically devises property that otherwise would have passed under the trust.
The other is any method manifesting clear and convincing evidence of the
settlor's intent.
The two will connections are alternatives. The other-method branch does not
itself require a signed writing, delivery, or trustee acceptance.
Signature, witnesses, notary, and delivery
Section 46A-6-602 does not impose one universal signature, witness, notary,
acknowledgment, or delivery ceremony across every amendment route. A method in
the trust may supply those requirements, and substantial compliance with that
method is the instrument-based route.
An ordinary New Mexico witnessed will used under the later-will route follows
NMSA 1978 § 45-2-502. It must be in writing, signed by the testator or a directed
signer in the testator's conscious presence, and signed by at least two people
in the presence of the testator and each other after witnessing the signing.
That will rule is not a universal witness requirement for every trust amendment.
Capacity standard
NMSA 1978 § 46A-6-601 makes the capacity required to amend a revocable trust the
same as the capacity required to make a will. It states no separate
amendment-only cognitive formula.
Multiple settlors and contributed property
Both spouses must act jointly to amend community property in a multi-settlor
trust. For property other than community property, each settlor may amend the
portion attributable to that settlor's contribution.
When fewer than all settlors act, § 46A-6-602(B)(3) requires the trustee to
promptly notify the other settlors. The statute does not turn that targeted
notice into a general lifetime beneficiary-notice requirement.
Agent, guardian, conservator, and court authority
An agent may exercise amendment power only to the extent expressly authorized
by the trust terms or the power of attorney. New Mexico therefore permits
either document to supply the express authority stated in § 46A-6-602(E).
A conservator may act only with approval from the court supervising the
conservatorship. If no conservator has been appointed, a guardian may use the
same approval route through the court supervising the guardianship. Appointment
alone does not complete an amendment.
Effective time, notice, and trustee protection
New Mexico does not declare every amendment effective merely upon signature or
make trustee delivery or acceptance a universal condition. The selected trust
method or available statutory alternative determines what must be completed.
Notice and trustee protection are separate. The trustee must promptly notify
other settlors when fewer than all amend, and § 46A-6-602(G) protects a trustee
who does not know of the amendment from liability for distributions and other
actions taken on the assumption that the old terms remained in force.
What trips people up
- Treating a stated method as automatically exclusive. The statutory
alternatives close only when the trust expressly makes its method exclusive. - Requiring both will connections. A later will or codicil may expressly
refer to the trust or specifically devise the affected property. - Looking only at the power of attorney. Express agent authority may come
from the trust terms or the power under § 46A-6-602(E). - Skipping the fiduciary hierarchy. A guardian enters the statutory route
only if no conservator has been appointed, and court approval is still needed.
Common questions
Must a New Mexico trust amendment be signed, witnessed, or notarized?
Not under one universal Trust Code ceremony. The trust's method may require
those acts. An ordinary later will follows § 45-2-502's writing, signature, and
two-witness rules, but those will formalities do not govern every amendment
route.
Does the amendment have to be delivered to or accepted by the trustee?
Section 46A-6-602 does not state a universal delivery or acceptance requirement.
The trust's own method may require a trustee-facing act, and the trustee's
knowledge matters to the statutory liability safe harbor.
Can one settlor amend the entire joint trust?
Not automatically. Community property requires both spouses' joint action;
other property follows each settlor's contributed portion. The trust and the
property classification must be reviewed together.
Can a guardian amend the trust?
Only if no conservator has been appointed and the court supervising the
guardianship approves the exercise under § 46A-6-602(F).
Statutes and sources
- NMSA 1978 §§ 46A-6-601 and 46A-6-602 — capacity, revocability and the
pre-2003 boundary, methods and exclusivity, later will and intent routes,
co-settlors, agent and fiduciary authority, notice, and trustee protection.
Official New Mexico Compilation Commission Chapter 46A
(accessed 2026-08-10). - NMSA 1978 § 45-2-502 — ordinary witnessed-will writing, signature, and
presence requirements. Official New Mexico Compilation Commission Chapter
45 (accessed
2026-08-10).
Source links
Every statute quoted above, linked, with the date we checked it.
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