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What is the due date of the IL-1120?

Answer #62 -- ( Published 08/04/2005 10:28 AM | Updated 07/12/2017 10:38 AM )

What is the due date of the IL-1120?

For tax years beginning on or after January 1, 2016:

Original due date:

Determine the date your tax year ends. If your tax year ends on:

  • a date other than June 30, Form IL-1120 is due on or before the 15th day of the 4th month following the close of the tax year.
  • June 30, Form IL-1120 is due on or before the 15th day of the 3rd month following the close of the tax year.

Note: If you are a cooperative, Form IL-1120 is due on the 15th day of the 9th month following the close of the tax year regardless of when your tax year ends.

Automatic filing extension:

Determine the date your tax year ends. If your tax year ends on:

  • a date other than June 30, we grant you an automatic extension of time to file your annual return of six months.
  • June 30, we grant you an automatic extension of time to file your annual return of seven months.

See Illinois Income Tax Regulations, Section 100.5020 for more information.

Note: If you are a cooperative, we grant you an automatic extension of time to file your annual return of seven month regardless of when your tax year ends.

For tax years beginning before January 1, 2016:

See the instructions which correspond to the year of the return you are filing.

You are not required to file Form IL-505-B, Automatic Extension Payment, in order to obtain this automatic extension. However, if you expect tax to be due, you must use Form IL-505-B to pay any tentative tax due in order to avoid interest and penalty on tax not paid by the original due date of the return. An extension of time to file your Form IL-1120 does not extend the amount of time you have to pay your Illinois tax liability.

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