Question: What is the 1099 filing address for Wisconsin?   Answer: Sign, date and mail your Form WT-7 (EMPLOYERS ANNUAL RECONCILIATION of Wisconsin Income Tax Withheld From Wages) along with your 1099 forms to:   Wisconsin Department of Revenue PO Box 8920 Madison WI 53708-8920   For more information refer to http://1099-efile.realtaxtools.com/state/Wisconsin/