Michigan Compiled Laws, Chapter 141. Municipal Financing § 141.613

(a) On a salary, bonus, wage, commission, and other compensation for services rendered as an employee for work done or services performed in the city. Income that the nonresident taxpayer receives as the result of disability and after exhausting all vacation pay, holiday pay, and sick pay is not compensation for services rendered as an employee for work done or services performed in the city. Vacation pay, holiday pay, sick pay and a bonus paid by the employer are considered to have the same tax situs as the work assignment or work location and are taxable on the same ratio as the normal earnings of the employee for work actually done or services actually performed.

(b) On a distributive share of the net profits of a nonresident owner of an unincorporated business, profession, enterprise, undertaking, or other activity, as a result of work done, services rendered, and other business activities conducted in the city.

(c) On capital gains less capital losses from sales of, and on the net profits from rentals of, real and tangible personal property, if the capital gains arise from property located in the city.