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FAQ
  Michigan Business Tax
I1. How must a foreign insurer file for purposes of the retaliatory tax when the insurer's state of incorporation requires unitary filing?
 
Answer:
A foreign insurer must calculate its burden for purposes of the Michigan retaliatory tax according to the laws of its state of incorporation. If the insurer's state of incorporation requires filing on a unitary basis, the insurer should compute its retaliatory tax burden using this method.

The retaliatory tax is calculated by first computing the burden to the foreign insurer doing business in Michigan and then computing the burden that would be imposed upon a hypothetical Michigan insurer as if it was performing the identical business activity in the foreign state. When making this calculation it should be assumed that the hypothetical Michigan insurer would calculate its liability in the same manner required of the foreign insurer.