When you print a copy of your Wisconsin return, the printout will contain a sheet titled "Homestead Credit Notes and Attachments Checklist." This checklist will help determine exactly what supporting documents you need to send with your Schedule H Wisconsin homestead credit form.
In addition, as noted on page 2 of Schedule H, you will need to attach proof of your property taxes (homeowner) or rent certificate (renter) in order to prevent delay of your refund.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.