Illinois State Return Form - Sign into your efile.com account and check acceptance by the irs. This form is used by illinois. Web 26 rows illinois has a flat state income tax of 4.95% , which is administered by the illinois department of revenue. Check your irs tax refund status. We last updated the individual. Web illinois income tax forms & instructions. Use this form for payments that are due on april 15, 2024,. 2024 estimated income tax payments for individuals.
Use this form for payments that are due on april 15, 2024,. 2024 estimated income tax payments for individuals. Web 26 rows illinois has a flat state income tax of 4.95% , which is administered by the illinois department of revenue. Web illinois income tax forms & instructions. Check your irs tax refund status. Sign into your efile.com account and check acceptance by the irs. This form is used by illinois. We last updated the individual.