Wisconsin: LLC Operating Agreement Requirements
The short answer
Wisconsin does not require an ordinary domestic LLC to adopt a written operating agreement; the current law recognizes oral, implied, record-form, and combined agreements, including one-person terms. Preformation terms can become the agreement when the LLC forms, the LLC is bound without assenting, and anyone who becomes a member is deemed to assent. Unless a written agreement creates manager management, the LLC is member-managed; contribution value or tax partnership capital accounts drive the principal voting and distribution defaults, while duties, information rights, liability floors, amendment rules, and transfer limits remain subject to Chapter 183's detailed boundaries.
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This is the general rule in Wisconsin. Ezel applies current Wisconsin law to your specific facts and answers with citations to the statutes.
| Governing law and document name | Wisconsin Uniform Limited Liability Company Law, ch. 183; 'operating agreement' (§§ 183.0101–.0102). Pre-2023 opt-out LLCs may remain under 2019 law (§ 183.0110) |
|---|---|
| Required or optional | Optional; agreement governs covered matters, and Chapter 183 governs what it does not address (§ 183.0105(1)–(2)) |
| Permitted form and signatures | Oral, implied, in a record, or combined; includes sole member. Manager management and specified duty/liability changes require a written agreement; no general witness/notary rule (§§ 183.0102(13), .0105(4), .0407(1)) |
| Adoption timing and effect | Initial members may agree before formation that terms become the agreement when the LLC forms; no separate post-formation adoption deadline (§§ 183.0106(3), .0401(1)–(2)) |
| Single member and assent | Sole-member terms valid; LLC bound without manifested assent; anyone becoming a member is deemed to assent (§§ 183.0102(13), .0106) |
| Management and authority defaults | Member-managed unless written agreement says manager-managed. Management votes follow contribution value/tax capital accounts; membership alone creates no agency, and filed authority statements govern outsiders (§§ 183.0301–.0302, .0407) |
| Voting, economic, and transfer defaults | Member votes and distributions track contribution value or tax partnership capital accounts; ordinary matters need a majority of transferable interests; later admission unanimous; transfer gives distributions, not governance (§§ 183.0401, .0404, .0407, .0502) |
| Nonwaivable rules and duties | Loyalty, care, and related remedies cannot be eliminated except through specified written tailoring; good faith remains, liability floors apply, and information/action rights cannot be unreasonably restricted (§§ 183.0105, .0409–.0410) |
| Amendment, filing, and records | Agreement sets method; member-managed default is all members, and written agreement may require outsider approval. Agreement is private; retain written versions. Agreement controls internally, filed record for outsider reliance (§§ 183.0105–.0107, .01075, .0407(2)(e)) |
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Requirements one by one
The agreement is optional and can take several forms
Section 183.0102 recognizes an agreement that is oral, implied, in a tangible or electronic record,
or any combination of those forms. It includes terms adopted by a sole member. Chapter 183 imposes
no general signature, witness, acknowledgment, or notary condition for the agreement itself.
Form still matters for particular choices. Manager management must appear in a written operating
agreement under § 183.0407. Section 183.0105 likewise reserves several duty and good-faith
variations for written tailoring.
Preformation terms become effective when the LLC forms
Section 183.0106 permits intended initial members to agree before formation that their terms will
become the operating agreement when the LLC forms. One intended member can do the same alone. The
statute states no separate deadline for adopting or replacing terms after formation.
The LLC is bound whether or not it manifested assent. A person who becomes a member is deemed to
assent. Section 183.0401 separately permits one-member formation and makes post-formation admission
unanimous by default.
Written terms are required to leave member management
An LLC is member-managed unless a written agreement says that it is managed by managers or that
management is vested in managers (§ 183.0407). In member management, rights are proportional to
recorded contribution value or, for an LLC taxed as a partnership, each member's partnership capital
account. Ordinary differences are decided by a majority of transferable interests.
Manager management uses a different decision rule: one manager decides, or multiple managers decide
by manager majority, and managers have equal management rights.
Neither structure gives a member third-party agency merely from membership. Section 183.0301 rejects
agency by status, while § 183.0302 provides an optional filed statement-of-authority route for outsider-
facing grants and limits.
Contribution value or tax capital accounts also drive distributions
Section 183.0404 uses the same two-part measure for pre-dissolution distributions: contribution value
in the LLC records, or partnership capital accounts for an LLC taxed as a partnership. A person has no
right to an interim distribution until the company decides to make one.
This is not necessarily the same as a generic ownership percentage in a form. A written agreement can
replace the fallback formula within § 183.0105's limits.
A transferable interest carries distributions, not membership
Section 183.0502 gives the transferee the transferred distributions. If the transferee does not become
a member, the transferor keeps the remaining member rights, duties, and obligations. The transfer alone
does not dissociate the member or dissolve the LLC.
The agreement's transfer restriction can make a transfer ineffective when the intended transferee knows
or has notice of it. Admission remains a separate step and defaults to all-member approval under § 183.0401.
Wisconsin preserves a detailed floor under contract terms
Section 183.0105 does not permit the agreement to eliminate loyalty or care duties or remedies, except
for the section's specified written-agreement tailoring. Good faith and fair dealing cannot be eliminated;
a written agreement may set performance standards only if they are not manifestly unreasonable.
The agreement also cannot exonerate willful unfair dealing involving a material conflict, specified
criminal conduct, or an improper-profit transaction. Required information cannot be varied, information
rights cannot be unreasonably restricted, and a member's right to maintain an action cannot be unreasonably
restricted. Section 183.0409 supplies the underlying duties, and § 183.0410 supplies the information rules.
The agreement is private, but written versions are company records
The agreement controls its amendment method. A member-managed LLC defaults to all-member consent, and
a written agreement may require a nonparty's approval or satisfaction of a condition. The agreement is
not filed merely because it governs the LLC; § 183.01075 requires the LLC to retain all written agreements,
amendments, and restatements at its principal office.
If an effective filed record conflicts with the agreement, § 183.0107 makes the agreement control for
members, dissociated members, transferees, and managers. The filed record controls for other persons to
the extent they reasonably rely on it.
What trips people up
- An oral or implied agreement can govern generally, but it cannot create manager-managed status.
- “Majority” does not necessarily mean one vote per person or a form's negotiated percentage. The
statutory measure uses contribution value or tax partnership capital accounts. - A Wisconsin LLC formed before 2023 that timely filed a statement of nonapplicability may still be
governed by the 2019 version of Chapter 183 rather than the current uniform law (§ 183.0110).
Common questions
Does a new member have to sign the existing agreement?
No general signature is required. Section 183.0106 deems a person who becomes a member to assent to
the agreement, although the agreement or a separate transaction may impose its own signed-record rule.
Does every member automatically have authority to bind the LLC?
No. Section 183.0301 says membership alone does not create agency power. Actual authority and an optional
filed statement of authority are separate questions.
Must a manager also be a member?
No. Section 183.0407(3)(e) says a manager need not be a member.
Statutes and sources
- Wis. Stat. §§ 183.0101–.0102, .0105–.0107 — names the current law; defines agreement forms;
governs scope, limits, assent, preformation terms, amendments, and filed-record conflicts.
Official § 183.0102,
official § 183.0105,
official § 183.0106, and
official § 183.0107
(accessed July 26, 2026). - Wis. Stat. §§ 183.01075, .0110 — requires written agreement records and states the 2023 transition
and old-law opt-out. Official § 183.01075
and official § 183.0110
(accessed July 26, 2026). - Wis. Stat. §§ 183.0301–.0302, .0304 — rejects agency by member status, provides the statement-of-
authority route, and supplies the liability shield. Official § 183.0301,
official § 183.0302, and
official § 183.0304
(accessed July 26, 2026). - Wis. Stat. §§ 183.0401, .0404, .0407 — governs membership, admission, distributions, management,
voting, and member-managed amendment. Official § 183.0401,
official § 183.0404, and
official § 183.0407
(accessed July 26, 2026). - Wis. Stat. §§ 183.0409–.0410 — supplies duties, good faith and fair dealing, and information rights.
Official § 183.0409 and
official § 183.0410
(accessed July 26, 2026). - Wis. Stat. § 183.0502 — governs transferable interests and transfer restrictions.
Official § 183.0502
(accessed July 26, 2026).
Source links
Every statute quoted above, linked, with the date we checked it.
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