South Dakota: Corporate Bylaws Adoption and Amendment Requirements

Requirements one by one

S.D. Codified Laws § 47-1A-101 names the South Dakota Business Corporation Act
that governs the ordinary domestic corporation addressed here.

Initial bylaws are mandatory after incorporation

S.D. Codified Laws §§ 47-1A-205 to 47-1A-206 require the incorporators or board
to adopt initial bylaws and permit any management or affairs provision
consistent with law and the articles. Named initial directors organize at a
meeting called by a majority. If the articles name no initial directors, a
majority of the incorporators calls a meeting to elect directors and complete
organization or to elect a board that completes organization. The meeting may
occur inside or outside South Dakota, and the sections state no post-filing
deadline.

Every incorporator may instead sign written consent describing the action. For
board action, S.D. Codified Laws § 47-1A-821 requires every director to sign
and deliver a consent unless the articles or bylaws require a meeting. The
board acts when all unrevoked consents arrive, although the consent may state
an effective time and a director may revoke before completion.

Board and shareholders share later power

Under S.D. Codified Laws §§ 47-1A-1020 to 47-1A-1021, shareholders may amend or
repeal bylaws. The board may also act unless the articles or the higher-board-
vote section reserves power to shareholders, or shareholders expressly protect
a bylaw from board amendment, repeal, or reinstatement.

S.D. Codified Laws § 47-1A-825.1(4) separately bars a committee from adopting,
amending, or repealing bylaws.

A higher-board-vote bylaw follows special safeguards

S.D. Codified Laws § 47-1A-1021 follows the actor of origin for a bylaw that
raises the board's quorum or vote. A shareholder-originated version remains
shareholder-controlled unless it says otherwise; a board-originated version
may be changed by the board or shareholders.

A shareholder-adopted or amended version may specify the shareholder or board
vote needed for amendment or repeal. When the board changes such a bylaw, its
action must satisfy the current or proposed quorum and vote, whichever is
greater.

S.D. Codified Laws § 47-1A-207 separately permits temporary emergency bylaws
unless the articles provide otherwise. Shareholders may amend or repeal them,
and the emergency terms end when the catastrophic-event emergency ends.

Current bylaws are directly inspectable on written notice

S.D. Codified Laws § 47-1A-1601.1 requires the corporation to keep its current
bylaws or restated bylaws and all current amendments at its principal office.
Under S.D. Codified Laws § 47-1A-1602, a shareholder may inspect and copy them
there during regular business hours after at least five business days' written
notice. The text does not require the notice to be signed or impose the proper-
purpose conditions that apply to separate categories of records.

The surveyed Act states no general signature, certification, acknowledgment,
notarization, or Secretary of State filing requirement for ordinary bylaws.

A shareholder agreement has a ten-year default and market cutoff

S.D. Codified Laws § 47-1A-732 permits a qualifying shareholder agreement to
restrict or eliminate board authority, allocate voting power, or otherwise
govern the corporation even when inconsistent with another Act provision and
not contrary to public policy. S.D. Codified Laws § 47-1A-732.1 lets it appear
in the articles or bylaws with every current shareholder's approval, or in a
writing signed by every current shareholder and made known to the corporation.

The agreement defaults to unanimous amendment and a ten-year term unless it
says otherwise. Under S.D. Codified Laws § 47-1A-732.3, it ends when shares are
listed on a national securities exchange or regularly traded in the specified
securities market. The board may then remove the agreement and its references
from the articles or bylaws without shareholder action.

What trips people up

South Dakota's direct-inspection notice is written but not expressly signed.
The five-business-day signed-notice wording used in some Model Act states
should not be imported here.

A higher-board-quorum or higher-board-vote bylaw carries actor-of-origin and
same-or-greater-threshold safeguards. The ordinary shared-power rule is not the
complete amendment answer for that bylaw.

The shareholder-agreement override ends on exchange listing or regular market
trading even if its stated ten-year term has not expired.

Common questions

Must a South Dakota corporation adopt bylaws?

Yes. S.D. Codified Laws § 47-1A-206 directs the incorporators or board to adopt
initial bylaws.

Can shareholders stop the board from changing a bylaw?

Generally yes under § 47-1A-1020(2), and § 47-1A-1021 adds separate protection
for a higher-board-quorum or higher-board-vote bylaw.

Can the board adopt bylaws without a meeting?

Yes, unless the articles or bylaws require a meeting, but every director must
sign and deliver the consent required by § 47-1A-821.

Does a shareholder need a proper purpose to inspect current bylaws?

No. Current bylaws are directly inspectable under § 47-1A-1602 after five
business days' written notice.

Statutes and sources

• S.D. Codified Laws § 47-1A-101 — governing Act. Official
  text, accessed August
  21, 2026.
• S.D. Codified Laws §§ 47-1A-205 to -207 — organization, mandatory
  initial adoption, contents, and emergency bylaws. Organization,
  bylaws, and
  emergency bylaws,
  accessed August 21, 2026.
• S.D. Codified Laws §§ 47-1A-732 to -732.3 — unanimous governance
  agreement, ten-year default, public-market cutoff, and board deletion
  authority. Agreement effect,
  form and term, and
  market cutoff,
  accessed August 21, 2026.
• S.D. Codified Laws §§ 47-1A-821 and -825.1(4) — delivered unanimous
  board consent and committee limits. Board consent
  and committee limits,
  accessed August 21, 2026.
• S.D. Codified Laws §§ 47-1A-1020 to -1021 — shared amendment power and
  higher-board-quorum or higher-board-vote protection. General
  amendment and
  special bylaw,
  accessed August 21, 2026.
• S.D. Codified Laws §§ 47-1A-1601.1 to -1602 — principal-office retention
  and direct shareholder inspection. Records
  and inspection,
  accessed August 21, 2026.