An Overview of Illinois State Personal Income Tax Extension Forms

- Updated February 21, 2022 - 8.00 AM by Admin, ExpressExtension

Does Illinois support tax extensions for personal tax returns?


Yes. The state of Illinois supports the automatic extension of time to file personal income tax Form IL -1040.

What Form does the state of Illinois require to apply for an extension?


There is no state-specific form to request an extension, as the state of Kansas automatically grants the extension for up to 6 months for individuals to file an income tax return with the state if you have a valid federal extension Form 4868.

When is the due date to file personal tax Form IL-1040 with Illinois?


Illinois personal tax return due date is extended to May 17.

The actual due date to file Illinois State individual tax extension Form is April 15 for calendar year filers (15th day of 4th month after the tax year ends).

How do I pay my balance due to the state of Illinois?


If you owe Illinois state taxes, you must pay the tax due by the regular due date. Otherwise, you will be charged with interests and penalties.

You may pay your tax due with a check, money order, credit card, E-Check, or ACH Debit or mailing the payment voucher.

  • MyTax Illinois (electronic payment is taken from your checking or savings account)
  • Credit Card (Visa, MasterCard, Discover, or American Express)

To make a payment with the state, use a Payment Voucher (IL-505-I) to make a payment.

Where to mail payment Form IL-505-I?


Mail the check with the payment voucher to the following address:

PO BOX 19005