Per Wisconsin, "If your landlord won't sign your rent certificate, fill in the fields above line 1, as well as lines 1-8b, and attach canceled checks or money order receipts for each month to verify your rent. Any portion not verified will not be allowed."
For more information, please click this Wisconsin link: https://www.revenue.wi.gov/Pages/FAQS/pcs-homesteadreview.aspx
