Illinois Tax Due Dates

2024 TAX CALENDAR

Complete 2024 Illinois Tax Calendar with all important state and federal tax filing deadlines at a glance.

January
16 4th quarter estimate due
16 Federal and State payroll tax deposits due for monthly depositors
16 C and S Corporations due for year ended October 31
22 Form ST-1 due (sales tax)
31 Form UI-3/40 due (payroll)
31 1099s due to recipients
31 Form 940 due (payroll)
31 Forms 941 and IL-941 due (payroll)
31 W-2 due to recipients
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February
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended November 30
20 Form ST-1 due (sales tax)
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March
15 Federal and State payroll tax deposits due for monthly depositors
15 SEP IRA Contribution due
15 S Corporations due for year ended December 31
20 Form ST-1 due (sales tax)
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April
15 TAX DAY
15 IRA contributions due (for prior year)
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended January 31
15 1st quarter estimate due
15 Partnerships and individual returns due
15 C Corporations due for year ended December 31
22 Form ST-1 due (sales tax)
30 Form UI-3/40 due (payroll)
30 Form 941 and IL-941 due (payroll)
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May
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended February 28
20 Form ST-1 due (sales tax)
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June
17 Federal and State payroll tax deposits due for monthly depositors
17 C and S Corporations due for year ended March 31
17 2nd quarter estimate due
20 Form ST-1 due (sales tax)
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July
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended April 30
22 Form ST-1 due (sales tax)
31 Form UI-3/40 due (payroll)
31 Forms 941 and IL-941 due (payroll)
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August
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended May 31
20 Form ST-1 due (sales tax)
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September
16 Federal and State payroll tax deposits due for monthly depositors
16 C and S Corporations due for year ended June 30
16 3rd quarter estimate due
16 SEP IRA contribution due (if tax return extended)
16 Extended due date for C and S corporations
20 Form ST-1 due (sales tax)
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October
16 Federal and State payroll tax deposits due for monthly depositors
16 C and S Corporations due for year ended July 31
16 Extended due date for partnerships and individuals
21 Form ST-1 due (sales tax)
31 Form UI-3/40 due (payroll)
31 Forms 941 and IL-941 due (payroll)
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November
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended August 30
20 Form ST-1 due (sales tax)
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December
16 Federal and State payroll tax deposits due for monthly depositors
16 C and S Corporations due for year ended September 30
20 Form ST-1 due (sales tax)
31 Required Minimum Distribution (RMD)