What is the due date of Form IL-1065?

In general, Form IL-1065, Partnership Replacement Tax Return, is due on or before the 15th day of the 4th month following the close of the taxable year. We grant you an automatic six-month extension of time to file your partnership tax return. 

See our Partnership web page for more information. 

If you have additional inquiries, you may submit them to the Questions, Comments, or Request form.