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Under MCL 208.1201(3), the tax base of a unitary business group for the Business Income factor of the MBT is the sum of the business income of each group member minus any income and related deductions arising from inter-group transactions. This total is then adjusted by the additions and subtractions outlined in MCL 208.1201(2) to arrive at the unitary group's business income tax base. After the tax base is allocated or apportioned according to MCL 208.1301, the tax base is adjusted by available business loss as outlined in MCL 208.1201(4).
The modified gross receipts tax base is defined as gross receipts minus purchases from other firms under MCL 208.1203(3). Within a unitary business group, each member must calculate gross receipts minus purchases from other firms. These individual calculations are then summed. Finally, modified gross receipts from inter-group transactions are removed. This produces the unitary business group tax base.
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