IL IL-1040 Information
You must file if you are an Illinois resident, you were required to file a federal income tax return, or you were not required to file a federal income tax return, but your Illinois base income from Line 9 is greater than your Illinois exemption allowance, an Illinois resident who worked in Iowa, Kentucky, Michigan, or Wisconsin, a retired Illinois resident who filed a federal return, an Iowa, Kentucky, Michigan, or Wisconsin resident who worked in Illinois, an Illinois resident who was claimed as a dependent on your parents’ or another person’s return, the surviving spouse or representative of a deceased taxpayer,
Link to official form info: Illinois IL-1040
Link to official form info for IL-1040
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- Upcoming Due Dates in the Next Year:*
- Thursday Apr 15, 2027
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* Due dates are based on the filing requirements for this form and may vary depending on your tax year.
10 Illinois Tax Filings & Forms:
IL-1040 - Individual Income Tax Return IL 1040/Sch.NR - Nonresident and Part-Year Resident Computation of Illinois Tax IL-1120 - Corporation Income and Replacement Tax Return IL-1120-ST - Small Business Corporation Replacement Tax Return IL-1065 - Partnership Replacement Tax Return IL-941 - Withholding Income Tax Return IL-501 - Department of Revenue Payment Coupon IU-3/40 - Employer's Contribution and Wage Report IL-941 - Withholding Income Tax Return ST-1 - Sales and Use Tax and E911 Surcharge ReturnAre we missing a Illinois tax form?
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