Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.440a

Sec. 440a. (1) Beginning August 3, 1987, an insurer that is subject to the worker's disability compensation act of 1969, 1969 PA 317, MCL 418.101 to 418.941, may credit against the tax imposed by section 476a  1 an amount equal to the amount paid during that tax year by the insurer under section 352 of the worker's disability compensation act of 1969, 1969 PA 317, MCL 418.352, as certified by the director of the bureau of worker's disability compensation under section 391 of the worker's disability compensation act of 1969, 1969 PA 317, MCL 418.391.

(2) The credit under this section shall be claimed in the manner prescribed by the revenue commissioner.

(3) A taxpayer claiming a credit under this section shall claim a portion of the credit allowed by this section equal to the payments made during a calendar quarter pursuant to section 352 of the worker's disability compensation act of 1969, 1969 PA 317, MCL 418.352, against the quarterly payments required under section 443.  2 The state treasurer shall refund a credit in excess of a quarterly payment to the taxpayer on a quarterly basis within 60 days after receipt of a properly completed quarterly filing as required by this act. A subsequent increase or decrease in the amount claimed for payments made by the insurer or self-insurer shall be reflected in the amount of the credit taken for the calendar quarter in which the amount of the adjustment is finalized.

(4) Except as otherwise provided in this subsection, the state treasurer shall refund, without interest, a credit under this section that is in excess of the insurer's tax liability for the calendar year to the insurer within 60 days after receipt of a properly completed annual tax return as required by this act. The state treasurer shall only make a refund to an insurer whose tax liability or fee amount under this act is greater than its tax liability under the former single business tax act, 1975 PA 228,  3 or the Michigan business tax act, 2007 PA 36, MCL 208.1101 to 208.1601.

(5) This section shall be applied retroactively to August 3, 1987.