Michigan Denials of Request for Extensions — Supplemental Statements are documents issued by the Michigan Department of Treasury that state specific reasons for the denial of a taxpayer's request for an extension of time to file their state taxes. The three types of Michigan Denials of Request for Extensions — Supplemental Statements are: Insufficient Funds Denial, Unreasonable Extension Denial, and Late-Filed Extension Denial. An Insufficient Funds Denial is issued when the taxpayer has not provided sufficient funds to cover the amount of taxes due. An Unreasonable Extension Denial is issued when the taxpayer has requested an extension that is beyond what is allowed by law. A Late-Filed Extension Denial is issued when the taxpayer has not filed the request for an extension by the due date.