Michigan's top marginal state income tax rate is 4.25%. State tax is progressive here, so most filers pay an effective rate well below the top figure — the calculator applies a blended approximation rather than modeling the full bracket schedule.
Taxable value growth is capped until the property transfers. Statewide median household income is $69,000, which is the default loaded above.
Remember that a state with no income tax is not automatically cheaper overall. Michigan has an effective property tax rate of 1.31% and average homeowners insurance of $1,600 a year — states without wage income tax typically recover revenue through property or sales taxes.