New Mexico: LLC Operating Agreement Requirements
The short answer
New Mexico does not require an operating agreement to form an LLC, but any operating agreement and its amendments must be written. Manager-management and authority to operate with one member must appear in the articles; otherwise contribution value drives member voting and economics, a majority generally amends the agreement, later admission requires all members' written consent, and an assignment transfers economic rights rather than member status.
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This is the general rule in New Mexico. Ezel applies current New Mexico law to your specific facts and answers with citations to the statutes.
| Governing law and document name | New Mexico Limited Liability Company Act; written 'operating agreement' (NMSA 1978 §§ 53-19-1, 53-19-2(O)) |
|---|---|
| Required or optional | Optional; filing articles forms the LLC, and Act defaults apply when neither the articles nor an operating agreement supplies a rule (NMSA 1978 §§ 53-19-7, 53-19-10, 53-19-17, 53-19-22-.23) |
| Permitted form and signatures | Written agreement, amended in writing. The LLC Act states no general signature, witness, acknowledgment, or notary formality; contribution promises have separate writing rules (NMSA 1978 §§ 53-19-2(O), 53-19-20-.21) |
| Adoption timing and effect | No express adoption window or deadline; the LLC forms when articles are filed or at their stated later time. Until written terms exist, the articles and Act supply the rules (NMSA 1978 §§ 53-19-2(O), 53-19-10) |
| Single member and assent | One person may own and operate the LLC, but the articles must state that it may carry on as a single-member LLC. No general deemed-assent rule; direct later admission follows the documents or all members' written consent (NMSA 1978 §§ 53-19-7, 53-19-8(E), 53-19-33(A), 53-19-36) |
| Management and authority defaults | Member-managed unless the articles vest management in managers; contribution-weighted majority decides. No general ordinary-/outside-course agency split; titled property may generally be transferred by any member, but a manager-managed LLC shifts that authority to managers (NMSA 1978 §§ 53-19-15, 53-19-17, 53-19-30) |
| Voting, economic, and transfer defaults | Votes, profits/losses, and interim distributions track contribution value; most member action uses a majority. Direct admission needs all members' written consent; assignment transfers distributions/returned capital only, and assignee membership generally needs unanimous consent (NMSA 1978 §§ 53-19-17, 53-19-22-.23, 53-19-32-.33, 53-19-36) |
| Nonwaivable rules and duties | Duty and liability rules in § 53-19-16 are defaults the documents may change. The Act separately requires company records and member inspection, bars insolvent distributions, imposes wrongful-distribution liability, and authorizes judicial dissolution for impracticability (NMSA 1978 §§ 53-19-16, 53-19-19, 53-19-26-.27, 53-19-40, 53-19-65) |
| Amendment, filing, and records | Agreement and amendments must be written; default amendment approval is contribution-weighted majority, while a greater-than-majority clause needs the same higher vote to amend. Agreement is not filed, but manager/single-member status belongs in articles; retain every current/prior agreement and amendment for member inspection (NMSA 1978 §§ 53-19-2(O), 53-19-8, 53-19-17(B)(1), (C), 53-19-19) |
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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)
Source links
Every statute quoted above, linked, with the date we checked it.
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