Corporate Shareholder Agreement Governance-Override Requirements in Michigan

At a glance

Requirements one by one

Section 488 supplies the corporation-binding override route

Michigan defines a domestic corporation as one formed under the Business Corporation Act or a qualifying pre-1973 Michigan corporation. A compliant Section 488 agreement is effective among the shareholders and corporation even though it is inconsistent with the Act (Mich. Comp. Laws §§ 450.1106(1), 450.1488(1)).

Its subject menu covers eliminating or restricting the board, distributions subject to the cross-referenced creditor protections, director and officer selection or removal, divided or weighted voting, property and service arrangements, transferred management and deadlock authority, contingent dissolution, assessable shares and their enforcement consequences, and other governance not contrary to public policy (Mich. Comp. Laws § 450.1488(1)).

Adoption is unanimous; amendment may use another agreed rule

The agreement may be in the articles or bylaws if all shareholders at the time approve it. Alternatively, every current shareholder signs a written agreement that is made known to the corporation. Amendment likewise defaults to all shareholders at the time, but the agreement may provide otherwise (Mich. Comp. Laws § 450.1488(2)).

Michigan states no fixed term or renewal rule in Section 488. If no shares have issued, incorporators or subscribers may act as shareholders when the agreement is made (Mich. Comp. Laws § 450.1488(9)).

Failure to satisfy the unanimity requirement does not automatically invalidate an agreement that is otherwise valid. It does mean the agreement lacks Section 488's qualifying corporation-binding status (Mich. Comp. Laws § 450.1488(1)-(2),(10)).

Notice omission preserves validity but exposes rescission

The agreement's existence must be conspicuously noted on issued certificates or the Mich. Comp. Laws § 450.1336(2) information statement for uncertificated shares. Existing certificates must be recalled and replaced. Missing notice does not invalidate the agreement or action taken under it (Mich. Comp. Laws § 450.1488(3)).

A purchaser lacking knowledge when ownership transfers may rescind. A compliant notation supplies knowledge; for uncertificated shares, the information statement also must be delivered by the transfer time. The action is due by the earlier of 90 days after discovery or two years after transfer (Mich. Comp. Laws § 450.1488(3)).

Public trading, shifted power, and dissolution have express consequences

The agreement ceases to be effective when shares are nationally exchange-listed or regularly traded in a market maintained by members of a national or affiliated securities association. After cessation, the board may remove an articles or bylaws agreement or reference without shareholder action (Mich. Comp. Laws § 450.1488(4)-(5)).

When the agreement limits board discretion or power, directors are relieved and the persons receiving the power assume the corresponding director-law liability. Those persons are also treated as directors for the cross-referenced indemnification and liability-limit rules. The agreement's existence, performance, partnership-like treatment, unincorporated-entity treatment, or failure to observe covered formalities is not by itself a ground for shareholder personal liability (Mich. Comp. Laws § 450.1488(6)-(7)).

A dissolution required by the agreement must be implemented through the statutory certificate of dissolution (Mich. Comp. Laws § 450.1488(8)).

What trips people up

Michigan expressly allows the agreement to make shares assessable, but the agreement must include both the assessment procedure and the consequences of a shareholder's failure to pay. That subject is part of Section 488's special menu, not a general license to impose an unstated assessment (Mich. Comp. Laws § 450.1488(1)(h)).

The public cutoff also has two branches. National-exchange listing and regular trading in the specified securities-association market each end the statutory effect (Mich. Comp. Laws § 450.1488(4)).

Common questions

Must the corporation sign the agreement?

Section 488 does not impose a corporation-signature requirement. The separate- writing route requires all current shareholders to sign and requires the writing to be made known to the corporation; the articles/bylaws route uses unanimous current-shareholder approval (Mich. Comp. Laws § 450.1488(2)(a)).

Can the agreement set a nonunanimous amendment rule?

Yes. Unanimity of current shareholders is the statutory amendment default, but the agreement may provide otherwise (Mich. Comp. Laws § 450.1488(2)(b)).

Is the agreement invalid if one current shareholder did not approve it?

It does not qualify for Section 488's special effect. Subsection (10), however, says failed unanimity does not invalidate an agreement that would otherwise be valid (Mich. Comp. Laws § 450.1488(10)).

Statutes and sources

• Mich. Comp. Laws §§ 450.1106(1) and 450.1109(2) — domestic-corporation and shareholder definitions. Official Michigan Business Corporation Act PDF, accessed August 27, 2026.
• Mich. Comp. Laws § 450.1336(2) — written statement for uncertificated shares and its Section 488 information cross-reference. Official Michigan Legislature text, accessed August 27, 2026.
• Mich. Comp. Laws § 450.1488(1) — corporation-binding effect, permitted subjects, creditor-protection cross-reference, assessable shares, and public- policy boundary. Official Michigan Legislature text, accessed August 27, 2026.
• Mich. Comp. Laws § 450.1488(2)-(3) — instruments, unanimity, signatures, corporate knowledge, amendment, certificate or statement notice, recall, purchaser rescission, and deadlines. Official Michigan Legislature text, accessed August 27, 2026.
• Mich. Comp. Laws § 450.1488(4)-(7) — public-trading cutoff, board cleanup, shifted-power liability and director treatment, and shareholder personal- liability protection. Official Michigan Legislature text, accessed August 27, 2026.
• Mich. Comp. Laws § 450.1488(8)-(10) — dissolution filing, incorporator or subscriber route, and effect of failed unanimity. Official Michigan Legislature text, accessed August 27, 2026.