Michigan: Corporate Bylaws Adoption and Amendment Requirements

Requirements one by one

Michigan requires initial bylaws but offers three adoption actors

Mich. Comp. Laws § 450.1101 names the governing statute the Business
Corporation Act. It supplies the ordinary domestic-corporation framework used
on this page.

Mich. Comp. Laws §§ 450.1223 and 450.1231 require initial bylaws and permit the
incorporators, shareholders, or board to adopt them. Before or after the articles
are filed, a majority of the incorporators select the board at a meeting or by
written instrument and may also adopt bylaws.

Once the articles are filed, any director may call the first board meeting on
at least three days' mailed notice to every director. A majority of directors is
the first-meeting quorum, and the board may adopt bylaws there. Under Mich. Comp.
Laws § 450.1525, unanimous written or electronic board consent may replace a
meeting unless the articles or bylaws prohibit it. The Act states no numeric
deadline for completing initial adoption.

The articles or bylaws can reserve and protect shareholder power

Section 450.1231 lets shareholders and the board amend or repeal bylaws or adopt
new bylaws. But the articles or bylaws may reserve new-bylaw power exclusively
to shareholders or state that all bylaws or a particular bylaw cannot be altered
or repealed by the board.

When the board amends bylaws, Mich. Comp. Laws §§ 450.1506, 450.1523, and
450.1525 supply important actor and vote distinctions. Section 450.1523(2)
requires at least a majority of all directors then in office, rather than merely
a majority present at a quorate meeting. Shareholder action ordinarily uses a
majority of votes cast under Mich. Comp. Laws § 450.1441 unless the articles or
another section of the Act requires more.

Content is broad, while special provisions remain actor-specific

Section 450.1231 permits any corporate-affairs regulation or management
provision consistent with law and the articles. Mich. Comp. Laws §§ 450.1123 and
450.1261(d) also recognize emergency bylaws as a corporate power, but the Act
does not supply a separate emergency-adoption vote or triggering procedure.

One content choice has a special actor rule. Under § 450.1506, classification
into two or three director classes must be placed in the articles or in a bylaw
adopted by shareholders or incorporators; an ordinary board-adopted bylaw is not
listed.

Shareholder access uses the general books-and-records route

Mich. Comp. Laws § 450.1485 requires corporate books, account records, and
shareholder, board, and executive-committee minutes, but it does not separately
list a current copy of the bylaws. Under Mich. Comp. Laws § 450.1487, a
shareholder of record seeking bylaws as other corporate books and records must
deliver a written demand that describes the proper shareholder-related purpose
and requested records with reasonable particularity; the records must be
directly connected to that purpose. If inspection is not permitted within five
business days after a compliant demand, the shareholder may seek a circuit-
court order.

The Act prescribes no general signature, certification, acknowledgment,
notarization, or administrator filing for ordinary bylaws themselves. A signed
board consent is evidence of the approval action, not a statutory execution
formality for the bylaw text.

What trips people up

Board amendment uses the serving-director denominator. Section 450.1523(2)
requires a majority of board members then in office even when the ordinary act
of a quorate board would need only a majority present.

A board committee does not inherit the board's amendment power. Mich. Comp.
Laws § 450.1528(1) expressly withholds authority to amend the bylaws.

The shareholder voting rule does not name bylaws as a source of a higher
general shareholder vote. Section 450.1441 allows a greater threshold when the
articles or another section of the Act requires it, so a corporation should not
assume that an ordinary board-adopted bylaw can raise the shareholder threshold.

Common questions

Does filing the articles itself create bylaws?

No. The articles create the corporation, while § 450.1231 separately requires
initial bylaws to be adopted by the incorporators, shareholders, or board.

Must Michigan bylaws be filed with the administrator?

The surveyed provisions impose no general public filing for ordinary bylaws.
They remain internal governance records unless a separate transaction-specific
statute requires a filing that refers to a bylaw.

Can a shareholder agreement that limits the board appear in the bylaws?

Yes, under Mich. Comp. Laws § 450.1488, if all then-current shareholders approve
the qualifying agreement. That special agreement ceases when the shares become
listed on a national securities exchange or regularly traded in a covered
market.

Statutes and sources

• Michigan Business Corporation Act, Mich. Comp. Laws §§ 450.1123, 450.1223,
  450.1231, 450.1261, 450.1441, 450.1485, 450.1487, 450.1488, 450.1506,
  450.1523, 450.1525, and 450.1528 — current official whole-Act text complete
  through PA 20 of 2026, rendered August 7 and accessed August 20, 2026.