Federal Payments Use this site to pay your federal payroll taxes
https://www.eftps.com/eftps/

WI Department of Revenue Use this site to pay WI witholding and sales tax
https://prd.wamsidp.wisconsin.gov/nidp/idff/sso?id=DORLogin&sid=0

IL Tax Net Use this site to file and pay IL witholding and IL unemployment if you have an IL unemployment number
https://taxnet.ides.state.il.us/Login/Login.aspx

IL Witholding Use this site to pay your IL witholding online
https://www.revenue.state.il.us/app/stii/