Il 1040 Form - 2021 estimated income tax payments for individuals. Use this form for payments that are due on april 15, 2021,. We last updated the individual. Web download and print the official forms for filing your individual income tax return in illinois. This form is used by illinois residents who file an individual income tax.
Use this form for payments that are due on april 15, 2021,. We last updated the individual. This form is used by illinois residents who file an individual income tax. 2021 estimated income tax payments for individuals. Web download and print the official forms for filing your individual income tax return in illinois.