Confidentiality is a protection guaranteed to all taxpayers by Michigan law, as stated in the Revenue Act, P.A. 122 of 1941, as amended, Section 28(1)(f).  The Michigan Department of Treasury cannot give a taxpayer's specific account information to anyone except the registered owner or a corporate officer of the business, unless form 151 POWER OF ATTORNEY AUTHORIZATION (POA) formerly form C-1029, is on file.
 

This means that employees of the Michigan Department of Treasury may not give a taxpayer's tax information to your family members (spouse, father, mother, etc), accountants, bookkeepers, attorneys, payroll services or anyone else without a POA signed by the owner or a corporate officer.