Form Il 1120 St Instructions - Small business corporation replacement tax return. For tax years ending on or. Like the federal form 1040, states each provide a core tax return form on which most. For tax years ending on or. Due on or before the 15th day of the 3rd month following.
For tax years ending on or. Small business corporation replacement tax return. Like the federal form 1040, states each provide a core tax return form on which most. Due on or before the 15th day of the 3rd month following. For tax years ending on or.