Individual
Individual Income (IL-1040-ES) Illinois: Individual - Individual estimated tax (Form IL-1040-ES) 3rd installment due
Employment
Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (W/Th/F) must deposit employment taxes
Sales & Use (ST-1)
Sales & Use (ST-1) Illinois: Business - Monthly filers required to file Form ST-1 for sales and use tax collected in August
Employment
Employment (Semi-weekly Employment Deposit) Business - Semi-weekly depositors (S/S/M/T) must deposit employment taxes
Employment
Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (S/S/M/T) must deposit employment taxes
Employment
Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (W/Th/F) must deposit employment taxes
Employment
Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (W/Th/F) must deposit employment taxes
Employment
Employment (Semi-weekly Employment Deposit) Business - Semi-weekly depositors (S/S/M/T) must deposit employment taxes
Employment
Employment (Semi-weekly Employment Deposit) Illinois: Business - Semi-weekly depositors (S/S/M/T) must deposit employment taxes
Individual
Individual Income (1041) Individual - Extended Income Tax Return for Trusts and Estates (Form 1041) due