Resources
Payroll Tax
EFTPS
Electronic Federal Tax Payment System
IL-941 or IL-501
Monthly Illinois Withholding Payments
Missouri-941
Monthly Missouri Withholding Payments
Illinois Unemployment
Missouri Unemployment
Sales Tax
Illinois
Missouri
Employee Tax
W-4
Federal Employee Withholding Form
MO-W-4
Missouri Employee Withholding Form
IL-W-4
Illinois Employee Withholding Form
I-9
Employment Eligibility Verification