Mich. Comp. Laws § 208.1411

Sec. 411. A taxpayer whose gross receipts allocated or apportioned to this state are greater than $350,000.00 but less than $700,000.00, may claim a credit against the tax imposed under this act equal to the tax liability after the credit under section 417 multiplied by a fraction the numerator of which is the difference between the person's allocated or apportioned gross receipts and $700,000.00 and the denominator of which is $350,000.00.