Mich. Comp. Laws § 45.624

Sec. 4. (1) A majority of the board of commissioners who approved a resolution under section 3 may revoke it by a subsequent resolution adopted before December 31. (2) Except as otherwise provided, revocation is effective October 1 of the next year. If a county revokes authorization within 5 years after it becomes a county juvenile agency under section 3, the revocation is not effective until the earlier of the following: (a) October 1 of the fifth year after the year in which the county became a county juvenile agency. (b) October 1 of the state fiscal year for which the state fails to appropriate the amount required to be distributed to the county under the social welfare act, 1939 PA 280, MCL 400.1 to 400.119b, and for which a loan has not been authorized for the deficiency under the emergency municipal loan act, 1980 PA 243, MCL 141.931 to 141.942, on terms acceptable to the county. (3) The county shall cease to be a county juvenile agency on the effective date of the resolution.