4578: Schedule of Partners (2025)
Michigan · Michigan Treasury · Used for tax years 2025
Form 4578 is the 2025 Michigan Business Tax Schedule of Partners. It reports each partner’s name, tax identification number, ownership percentage, and share of business income, along with total ownership and income shares.
What you'll need
Have the following information ready to complete the schedule:
- Taxpayer name and Federal Employer Identification Number (FEIN) or TR number. For a unitary business group, enter the designated member’s name.
- For a unitary business group, the name and FEIN or TR number of the member reporting on this form.
- Each partner’s name. For an individual, use last name, first name, and middle initial.
- Each partner’s FEIN, TR number, or Social Security number.
- Each partner’s ownership percentage and share of business income.
How to file
Enter the taxpayer information and complete the Partner Identification table. Total the ownership percentages from column C on line 2 and the shares of business income from column D on line 3.
If you need more space, submit additional Forms 4578. Identify the taxpayer and complete Partner Identification on each additional form.
The supplied form text does not provide a mailing address or e-file directions.
Common mistakes
- Do not let the total ownership percentage in column C exceed 100%.
- Do not let the total in column D exceed the partnership’s business income.
- Do not overlook the credit limits: the partnership is not eligible for the Small Business Alternative Credit if any partner’s column D share is over $180,000 after loss adjustment. It is not eligible for the Start-Up Business Credit if any partner’s column D share is over $135,000.
- If you submit additional Forms 4578, remember to identify the taxpayer and complete Partner Identification on each one.
Questions people ask
What identification number do I enter for a partner?
Enter the partner’s FEIN, TR number, or Social Security number in column B.
What if I need more room to list partners?
Submit additional Forms 4578. Identify the taxpayer and complete Partner Identification on each additional form.
How does a partner’s income share affect the Small Business Alternative Credit?
The partnership is not eligible if any partner’s share of business income in column D is over $180,000 after loss adjustment.
How does a partner’s income share affect the Start-Up Business Credit?
The partnership is not eligible if any partner’s share of business income in column D is over $135,000.