To find your Illinois income tax payment frequency, login to your account on MyTax Illinois:
- From the My Accounts page, choose your withholding income tax account.
- From the Withholding account page, under “I want to…” choose “Make an IL-501 Payment.”
- On the Payment Schedule page, choose any period in the year that you want to know your payment frequency.
- On the WIT Payment Schedule page, your Payment frequency will be shown in the center of the page.