The state of Wisconsin requires both a Withholding Tax ID and a State Unemployment Tax ID, both formats and links to apply are below. 
Withholding Tax ID
Agency Contact Info: Secretary of Revenue Department of Revenue Income, Sales, and Excise Tax Division P.O. Box 8902 Madison, WI  53708 (608) 266-2776
Format: 036-##########-##
Applied For: Not Accepted

Unemployment Tax ID
Agency Contact Info: Wisconsin Department of Workforce Development 201 East Washington Avenue P.O. Box 7942 Madison, WI  53707 608-261-6700 Note:  The agency will not verbally provide Taxpayer rate information to anyone but the Taxpayer.
Format: ######-000-#
Applied For: Not Accepted

After a new tax ID has been received, please send all documentation showing proof of the tax ID obtained to the Tax Department by submitting a Tax Ticket. Choose "Need to Add Tax Jurisdiction/Obtained Tax ID" from the ticket reason drop down. It's best practice to add new tax ID's before processing payment for employees within the jurisdiction. 

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