HB 4183 increases the motor fuel tax rate and expands the types of fuels subject to the tax under Michigan law. It directly affects motor fuel sellers (like gas stations) and consumers through higher costs for gasoline and other taxed fuels. The bill amends Section 8 of the 2000 Motor Fuel Tax Act (MCL 207.1008) to implement these changes, which became law immediately upon approval by the Governor on October 7, 2025.
HB 4951 creates a new tax on marijuana sales to fund state road infrastructure projects. It directly affects marijuana businesses (which pay the tax) and state transportation budgets (which receive the revenue). The key mechanism establishes a dedicated funding stream, redirecting tax revenue from cannabis sales toward repairing and maintaining roads, rather than general state funds. The bill became law immediately upon the Governor's approval on October 7, 2025.
HB 4287 modifies Michigan's individual income tax code to adjust deductions for retirement and pension benefits. It increases the maximum deductible amount for retirement income to $42,240 for single filers and $84,480 for joint filers, with annual adjustments based on the Consumer Price Index. This change directly affects Michigan taxpayers who receive retirement or pension benefits, allowing them to reduce their taxable income by a larger portion of those benefits while maintaining specific eligibility rules. The bill does not alter other tax provisions or include broadband-related funding as referenced in its title.
House Bill 4342 amends Michigan's state revenue sharing act, introducing a new condition for withholding state funds from local governments. Beginning October 1, 2025, the state treasurer would withhold all revenue sharing payments from any city, village, township, or county. This would occur if the local government enacts or enforces a law, ordinance, policy, or rule that violates the "local government sanctuary policy prohibition act" or the "county law enforcement protection act." Payments would be withheld for as long as the violating policy remains in effect. This bill is tied to the enactment of House Bills 4338 and 4339.
HB 4184 increases Michigan's excise tax on aviation fuel from 3.10 cents to 4.00 cents per gallon. It directly affects fuel sellers, airlines, and airport operators by changing how this tax revenue is distributed. The bill modifies Section 203 of the Aeronautics Code to require 35% of the tax revenue to fund the state aeronautics fund and 65% to fund qualified airports. It also retains the 1.5-cent refund for airlines operating interstate flights and the exemption for fuel used in leaded racing fuel production.
HB 4186 increases Michigan's business income tax rate from 4.95% to 30% for all business activity occurring on or after January 1, 2025. This rate change directly affects businesses operating within Michigan that are subject to the state's business tax, including those previously filing under the corporate income tax act. The bill amends sections 201 and 500 of the Michigan Business Tax Act (2007 PA 36) to implement this rate increase and adjust the tax base calculations for businesses. The change represents a significant policy shift in how Michigan taxes business income, effective in 2025.
