Mich. Comp. Laws § 141.656

Sec. 56. If an employee refuses to furnish a withholding certificate upon the request of his or her employer, the employer shall withhold a percentage of the employee's total compensation equal to the percentage rate of tax on resident individuals as set by ordinance to be levied under this ordinance, and report and pay the withholding on the basis of the best information in the possession of the employer.