Michigan Compiled Laws, Chapter 205. Taxation § 205.233

Sec. 33. (1) A tax is imposed upon every generation-skipping transfer in which the original transferor is a resident of this state at the date of the transfer made by the original transferor. The tax is equal to the maximum allowable federal credit under the internal revenue code for state generation-skipping transfer taxes paid to the states. This tax shall be reduced by the amount of all generation-skipping taxes paid to states other than this state, which amount shall not exceed an amount equal to the proportional share of that maximum allowable federal credit that the gross value of all transferred real and tangible personal property subject to generation-skipping transfer taxes located in states other than this state bears to the gross value of all transferred property subject to generation-skipping taxes wherever located.

(2) A tax is imposed upon every generation-skipping transfer in which the original transferor is not a resident of this state at the date of the transfer by the original transferor but in which the property transferred includes real or tangible personal property located in this state. The tax is an amount equal to the proportional share of the maximum allowable federal credit under the internal revenue code for state generation-skipping transfer taxes paid to the states that the gross value of all transferred real and tangible personal property subject to generation-skipping transfer taxes located in this state bears to the gross value of all transferred property subject to generation-skipping transfer taxes wherever located.