HB 4186 amends the Michigan Business Tax Act to sharply increase the business income tax rate beginning January 1, 2025, from 4.95% to 30.0% for business activity occurring on and after that date. The bill keeps the existing structure of the tax base and its adjustments, including rules for apportionment, unitary business groups, related-party intangible expense add-backs, net operating loss treatment, and several deductions tied to book-tax differences, U.S. obligations, self-employment earnings, and charitable contributions to the Michigan Education Trust.
The bill also expands and clarifies special deductions and credits tied to affordable housing and certain certificated credits. It authorizes deductions for gains from sales of residential rental units to qualified affordable housing projects that agree to keep units rent-restricted for at least 15 years, and it provides a separate deduction for qualified affordable housing projects based on the share of rent-restricted units they own. It further revises election rules in section 500 so certain taxpayers with certificated credits may choose to file under the Michigan Business Tax rather than the individual income tax, and it adds or preserves special treatment for unitary business groups, flow-through entities, battery-related voucher agreements, and farmland development rights credits.
In practical terms, the bill would significantly increase the tax burden on businesses subject to the Michigan Business Tax after 2024 while preserving a number of targeted deductions and election provisions for specific taxpayers and industries. It would affect corporations, unitary business groups, pass-through entities making elections, and affordable housing projects, and it would require the Department of Treasury to administer new reporting, lien, and compliance rules for the housing-related deductions. The bill is also tie-barred to a package of related bills, meaning it does not take effect unless the other listed bills are enacted.
The overall sentiment in the recorded votes was favorable but not unanimous. The bill was reported from committee with a 10-0 vote, indicating strong support at that stage, but the House third-reading vote was 61-47, showing substantial opposition on the floor. The immediate-effect vote suggests supporters viewed the bill as urgent or necessary to implement the broader tax package quickly.
The main point of contention appears to be the large rate increase and the broader tax-policy shift it represents, especially for businesses subject to the Michigan Business Tax. At the same time, the bill contains multiple targeted carve-outs and incentives for affordable housing, battery manufacturing-related investment, and certain certificated-credit holders, which may have drawn support from affected industries and housing advocates but also likely raised concerns about complexity, fairness, and selective tax treatment.
HB 4186 would amend sections 201 and 500 of the Michigan Business Tax Act, changing the business income tax rate for tax years beginning on or after January 1, 2025 from 4.95% to 30.0% and revising related tax election and credit rules. It would preserve and refine existing apportionment, deduction, and unitary business group provisions while adding or clarifying special deductions for affordable housing transactions and project income, as well as rules for taxpayers claiming certain certificated credits. The bill would also affect how some taxpayers may elect between the Michigan Business Tax and the individual income tax, and it imposes new administrative requirements such as reporting, lien recording, and compliance tracking for housing-related deductions.
The bill appears to have had mixed but generally organized support: it advanced out of committee unanimously and then passed the House on third reading by a narrower margin. That pattern suggests broad support among committee members for the package, but meaningful disagreement on the floor over the tax increase and the bill’s policy design. The immediate-effect vote indicates supporters wanted the measure to take effect without delay, likely as part of a coordinated legislative package.
The most obvious point of contention is the dramatic increase in the business income tax rate to 30.0% beginning in 2025, which would be a major change for affected businesses and likely the central reason for opposition. Another area of concern is the bill’s complexity: it creates multiple special deductions, elections, and exceptions for affordable housing projects, unitary business groups, flow-through entities, battery-related voucher agreements, and farmland-related credits, which may raise fairness and administrative concerns. Supporters likely emphasize the housing incentives and targeted credit provisions, while opponents likely focus on the tax burden increase, the selective nature of the carve-outs, and the broader impact on business taxpayers.