Mich. Comp. Laws § 207.6
The several corporations, persons, copartnerships, companies and associations whose property is subject to assessment and taxation under the provisions of this act, and whose annual gross receipts exceed $1,000,000.00 shall annually between the first day of January and the thirty-first day of March in each year, and the several corporations, persons, copartnerships, companies and associations whose property is subject to assessment and taxation under the provisions of this act, and whose annual gross receipts do not exceed $1,000,000.00, shall annually between the first day of January and the fifteenth day of March in each year, under oath of the president, secretary, superintendent, or chief officer of such corporation, company or association, or of the person or persons owning such property, make and file with the state board of assessors an annual report, in such form as said board may provide, upon blanks to be furnished by said board setting forth specifically upon blanks so furnished by the board the information prescribed by said board to enable them to make the assessment required in this act.
MCL 207.6