Illinois Department of Revenue - State Sales Tax Filing

Are you required to file for Illinois Sales Tax? Claremont Management will file and facilitate your payment to the State of Illinois for JUST $37.50 PER LOCATION PER FILING!

Learn more →

2019 Tax Calendar

2018 Tax Calendar (archived) →

January
15 4th quarter estimate due
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended October 31
21 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
spacer
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)
28 1099s due to IRS
28 W-2 and W-3 due to IRS
spacer
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)
spacer
April
15 TAX DAY - IRS Deadline to file 2018 Income Tax Returns
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)
spacer
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)
spacer
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)
spacer
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)
spacer
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)
spacer
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)
spacer
October
15 Federal and State payroll tax deposits due for monthly depositors
15 C and S Corporations due for year ended July 31
15 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)
spacer
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)
spacer
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)