Revocable Trust Amendment Requirements in New Mexico

At a glance

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).