Mich. Comp. Laws § 211.210
Such local unit shall file its budget and statements provided for in the preceding section with the board on or before the third Monday in April of each year. Each local unit which has voted to increase the total tax rate limitation as provided in the last sentence of the first paragraph of section 6 of article 9 of the state constitution shall also file with the board a sworn statement showing the date on which the election was held, the number of votes cast for and the number of votes cast against such increase, the total tax rate limitation voted at such election, and the number of years for which such limitation was voted. If any local unit shall fail to file its budget and statements by such date, the board shall proceed with its duties and act on the basis of such information with respect to such local unit as it may derive from other sources.
MCL 211.210