Individual Income (1040A) Individual - Extended Individual Income Tax Return (Form 1040A) due

Pass-Through Income (IL-1065) Illinois: Business - Extended Partnership Replacement Tax Return (Form IL-1065) due

Employment (Monthly Employment Deposit) Business - Monthly depositors must deposit employment taxes for payments in previous month

Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (W/Th/F) must deposit employment taxes

Employment (Semi-weekly Employment Deposit) Business - Semi-weekly depositors (W/Th/F) must deposit employment taxes

Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (S/S/M/T) must deposit employment taxes

Employment (Semi-weekly Employment Deposit) Business - Semi-weekly depositors (S/S/M/T) must deposit employment taxes

Sales & Use (ST-1) Illinois: Business - Monthly filers required to file Form ST-1 for sales and use tax collected in September

Sales & Use (ST-1) Illinois: Business - Quarterly filers required to file Form ST-1 for sales and use tax collected in the 3rd quarter

Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (W/Th/F) must deposit employment taxes