LLC Operating Agreement Requirements in New Mexico

At a glance

Requirements one by one

Governing law and document name

NMSA 1978 § 53-19-1 names Chapter 53, Article 19 the Limited Liability Company Act. NMSA 1978 § 53-19-2(O) defines the internal governance document as an “operating agreement.”

Required or optional

An operating agreement is optional. NMSA 1978 § 53-19-7 forms the LLC by filing articles, and § 53-19-10(A) makes the filed articles—not an agreement—the event that creates the separate legal entity. Sections such as NMSA 1978 § 53-19-22 and § 53-19-23 expressly supply defaults when neither the articles nor an operating agreement provides a rule.

Permitted form and signatures

NMSA 1978 § 53-19-2(O) defines an operating agreement as a written agreement and includes only amendments made in writing. Article 19 states no general signature, witness, acknowledgment, or notarization formality for the agreement itself. A contribution promise is a separate writing issue: NMSA 1978 § 53-19-20(A) and § 53-19-21(A) address written promises to contribute property, services, or money.

Adoption timing and effect

The Act states no agreement-adoption deadline or express preformation-effect rule. NMSA 1978 § 53-19-10(A) instead fixes formation when the articles are filed or at their stated later date or time. Until written agreement terms supply a different rule, the articles and statutory defaults control.

Single member and assent

NMSA 1978 § 53-19-7 permits one person to own and operate the LLC, but NMSA 1978 § 53-19-8(E) requires the articles to state that the company may carry on as a single-member LLC. Article 19 does not separately declare that the LLC, a manager, or a later member is bound without assent or signature.

For a later direct member, NMSA 1978 § 53-19-36(A)-(B) follows the articles or agreement and otherwise requires all members' written consent; admission cannot be effective before formation. For an assignee, NMSA 1978 § 53-19-33(A) defaults to unanimous consent evidenced as the documents specify or, if they are silent, by a dated instrument signed by the other members.

Management and authority defaults

NMSA 1978 § 53-19-15(A) defaults to member management. Manager management must be stated in the articles under NMSA 1978 §§ 53-19-2(L) and 53-19-8(D). NMSA 1978 § 53-19-15(B) then lets the articles or agreement allocate manager selection, duties, and powers; the private agreement alone is not the statutory switch.

Internal decisions use the contribution-weighted majority rules in NMSA 1978 § 53-19-17(A) and § 53-19-17(B)(4), rather than an ordinary-course versus outside-course split. For titled company property, NMSA 1978 § 53-19-30(A) gives any member transfer authority in the default structure unless the documents provide otherwise. NMSA 1978 § 53-19-30(E) shifts that authority to managers—and away from a member acting solely as a member—when the articles establish manager management.

Voting, economic, and transfer defaults

NMSA 1978 § 53-19-17(A) weights votes by current contribution value. NMSA 1978 § 53-19-17(B)(1) generally uses a majority of that voting power for amendments, substantially all asset dispositions, mergers, and other member-approved action.

NMSA 1978 § 53-19-22 allocates profits and losses by contribution value when the documents are silent. NMSA 1978 § 53-19-23 uses the value of contributions not returned for interim distributions.

NMSA 1978 § 53-19-32(A)(1)-(5) makes an assignment economic only until the assignee becomes a member: the assignee receives distributions and returned capital, while the assignor generally retains member powers. Member admission then follows the unanimous-consent rule in § 53-19-33(A) or the documents' chosen route.

Nonwaivable rules and duties

NMSA 1978 § 53-19-65(A)-(B) favors freedom of contract while preserving supplementary principles of law and equity. The conduct rules in NMSA 1978 § 53-19-16(B) and § 53-19-16(D)—including the gross-negligence/willful-misconduct liability standard and the duty to account for specified benefits—begin with “unless otherwise provided” in the articles or operating agreement, so they are defaults rather than fixed Article 19 floors.

Other sections state rules without that agreement override. NMSA 1978 § 53-19-19(A)(4) requires retention of every current and prior agreement and amendment, while § 53-19-19(B) permits member inspection. NMSA 1978 § 53-19-26(A) bars a distribution that fails either solvency test, while § 53-19-27(A) imposes the specified liability on a member or manager who approves an excessive distribution. NMSA 1978 § 53-19-40 permits a member to seek judicial dissolution when carrying on the business in conformity with the articles or agreement is not reasonably practicable.

Amendment, filing, and records

NMSA 1978 § 53-19-2(O) makes amendment a written act. Under NMSA 1978 § 53-19-17(B)(1), the default vote is a contribution-weighted majority. Section 53-19-17(C) protects a greater-than-majority voting provision by requiring that same higher vote to amend it.

The agreement is not the public formation filing. NMSA 1978 § 53-19-8(D)-(F) instead puts manager status, single-member authority, and any optional public internal-affairs terms in the articles. NMSA 1978 § 53-19-19(A)(4) requires the LLC to keep every current and prior operating agreement and amendment at its principal place of business, and subsection (B) gives members a reasonable business-hours inspection and copying right.

What trips people up

A written agreement cannot privately create manager-managed status by itself. The articles must say management is vested in a manager.

Single-member status also belongs in the articles. New Mexico requires an articles statement that the LLC may carry on with one member.

The amendment default is majority approval. It is not the unanimity fallback used by many newer LLC acts. A higher voting threshold protects itself under § 53-19-17(C).

Internal management and outsider authority are different questions. Section 53-19-15 allocates management, while § 53-19-30 supplies a narrower statutory rule for instruments transferring titled company property.

Common questions

Can a New Mexico LLC use an oral operating agreement? No. NMSA 1978 § 53-19-2(O) defines the agreement as written and requires written amendments.

Does transferring an interest make the buyer a member? No. NMSA 1978 § 53-19-32 gives an assignee economic rights first. Membership generally requires unanimous consent under § 53-19-33 unless the articles or agreement provide another route.

Must old versions be retained? Yes. NMSA 1978 § 53-19-19(A)(4) requires a copy of every current and prior operating agreement and every amendment.

Statutes and sources

• NMSA 1978 §§ 53-19-1 and 53-19-2(L), (O) — Act name, manager definition, and written-agreement requirement. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 §§ 53-19-7, 53-19-8(D)-(F), and 53-19-10(A) — formation, single-member and manager statements, and legal-entity timing. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 §§ 53-19-15 to 53-19-17 — management, customizable conduct rules, contribution-weighted voting, majority action, and protected higher thresholds. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 § 53-19-19 — retained agreements, amendments, records, and inspection. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 §§ 53-19-20 to 53-19-23 — contribution promises and contribution-value economic defaults. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 §§ 53-19-26 and 53-19-27 — distribution limits and liability. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 § 53-19-30 — authority to transfer titled company property. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 §§ 53-19-32, 53-19-33, and 53-19-36 — assignments and member admission. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 § 53-19-40 — judicial dissolution for impracticability. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)
• NMSA 1978 § 53-19-65(A)-(B) — freedom of contract and supplementary law and equity. https://nmonesource.com/nmos/nmsa/en/4400/1/document.do (accessed 2026-07-26)