Il State Income Tax Form - Web illinois income tax forms. If you live in the state of illinois or earn income within the state, it’s likely you will have to pay illinois income. Web 26 rows illinois has a flat state income tax of 4.95%, which is administered by the illinois department of revenue. 2024 estimated income tax payments for individuals. Use this form for payments that are due on april 15, 2024,. We last updated the individual.
Use this form for payments that are due on april 15, 2024,. Web illinois income tax forms. Web 26 rows illinois has a flat state income tax of 4.95%, which is administered by the illinois department of revenue. 2024 estimated income tax payments for individuals. We last updated the individual. If you live in the state of illinois or earn income within the state, it’s likely you will have to pay illinois income.