Mich. Comp. Laws § 500.4623

Sec. 4623. (1) A sponsored captive insurance company may discount its loss and loss adjustment expense reserves at the lesser of treasury rates or the captive insurance company's actual rate of return applied to the applicable payments projected through the use of the expected payment pattern associated with the reserves. (2) The commissioner may disallow the discounting of reserves if a sponsored captive insurance company violates a provision of this act.