Skip to main content
Sign Up For Updates

Who must file Form IL-990-T and when is its due date?

You must file Form IL-990-T, Exempt Organization Income and Replacement Tax Return, if you are an organization exempt from federal income tax by reason of Section 501(a) of the Internal Revenue Code (IRC) and earn or receive unrelated business taxable income as determined under IRC Section 512, and

  • have net income as outlined under the Illinois Income Tax Act (IITA) or
  • are a resident or qualified to do business in the state of Illinois and are required to file federal Form 990-T, Exempt Organization Business Income Tax Return, (regardless of net income or loss).

In general, Form IL-990-T is due on or before the 15th day of the 5th month following the close of the taxable year. If you are an employee trust as described in IRC Section 401(a), you must file Form IL-990-T on or before the 15th day of the 4th month following the close of the taxable year.

If you are taxed as a:

  • Trust, we grant you an automatic six-month extension of time to file your tax return.
  • Corporation, we grant you an automatic seven-month extension of time to file your tax return.

See our Exempt Organization web page for more information.

If you have additional inquiries, you may submit them on the Questions, Comments, or Requests form.