Mich. Const. art. VII, § 2

Any county may frame, adopt, amend or repeal a county charter in a manner and with powers and limitations to be provided by general law, which shall among other things provide for the election of a charter commission. The law may permit the organization of county government in form different from that set forth in this constitution and shall limit the rate of ad valorem property taxation for county purposes, and restrict the powers of charter counties to borrow money and contract debts. Each charter county is hereby granted power to levy other taxes for county purposes subject to limitations and prohibitions set forth in this constitution or law. Subject to law, a county charter may authorize the county through its regularly constituted authority to adopt resolutions and ordinances relating to its concerns.

The board of supervisors by a majority vote of its members may, and upon petition of five percent of the electors shall, place upon the ballot the question of electing a commission to frame a charter.

No county charter shall be adopted, amended or repealed until approved by a majority of electors voting on the question.