Mich. Comp. Laws § 123.1361: Debt payment.

Sec. 21.

(1) If a municipality does not adjust its debt millage rate to reflect reimbursement for the small taxpayer exemption loss under section 17(1)(a), the reimbursement under section 17(1)(a) shall be reduced by the excess debt taxes levied.

(2) A municipality shall use the amount received under section 17(4) for debt millage to pay debt. If a payment under section 17(4) for debt millage is not used to pay debt, the amount not used to pay debt shall be deducted from a subsequent payment under section 17(4), unless all debts have been repaid, in which case the amount received under section 17(4) for debt millage may be used by the municipality in any manner and shall not be deducted from a subsequent payment under section 17(4).