Mich. Comp. Laws § 141.617
At the election of an unincorporated business, profession or other activity, the entity, on behalf of the owners, may compute and pay the tax due with respect to each owner's share of the net profit of the activity after giving effect to exemptions to which each owner is entitled. This election is available to all unincorporated business entities having 2 or more owners regardless of the residence of the owners. The tax thus paid by the entity shall constitute all tax due with respect to each owner's distributive share of the net profits of the unincorporated business, profession or other activity.
If the unincorporated business, profession or other activity elects under this section to file a return and pay the tax on behalf of its owners, the election and filing are deemed to meet the requirements of this ordinance for the filing of a return for each owner who has no other income subject to the tax. However, a return is required from any such owner having taxable income other than his distributive share of the net profits of the entity. In such case the entire income subject to the tax shall be included in the return and credit taken thereon for the tax paid in his behalf by the unincorporated activity.
If the unincorporated business, profession or other activity elects to pay the tax on behalf of the owners, then the unincorporated business, profession or other activity assumes the status of a taxpayer and is liable to interest and penalty if payment is not made by the due date, in accordance with the calendar or fiscal year used by the unincorporated business, profession or other activity.
MCL 141.617