Final answer:
To determine the overall state income tax for the unitary group, calculate the apportioned income and apply the tax rates of each state. If the entities were non-unitary, calculate the state income tax for each corporation individually.
Step-by-step explanation:
a. To determine the overall state income tax for the unitary group, we need to calculate the apportioned income and apply the tax rates of each state.
First, we need to calculate the apportionment factor for each corporation. The apportionment factor is calculated by dividing the sales, payroll, and property of each corporation by the total sales, payroll, and property of the unitary group.
Then, we multiply the apportionment factors by the taxable income of each corporation and apply the respective tax rates of State A and State B. Finally, we add the state income taxes of True Corporation and Trumaine Corporation to determine the overall state income tax for the unitary group.
b. If True Corporation and Trumaine Corporation were non-unitary, we would calculate the state income tax for each corporation individually. We would multiply the taxable income of each corporation by the respective tax rates of State A and State B to determine the aggregate state income tax for the entities.
c. Dear Trumaine's board of directors, I have analyzed the state income tax implications for True Corporation and Trumaine Corporation. Based on the information provided, the overall state income tax for the unitary group is determined by calculating the apportioned income and applying the tax rates of each state. If the entities were non-unitary, the state income tax would be calculated for each corporation individually. Please let me know if you need any further assistance.