Illinois automatic extension 2026

1. Click ‘Get Form’ to open the Illinois Automatic Extension (IL-505-I) in the editor.
2. Begin by entering your Social Security number and your spouse’s Social Security number in the designated fields.
3. Fill in your first name, middle initial, last name, and your spouse's details as required.
4. In the Tax Payment Worksheet section, calculate your total expected income tax and any other taxes you will report on Form IL-1040. Enter this amount on Line 1.
5. Complete Lines 2 through 5 by entering amounts for withholding, estimated payments, previous payments, and allowable credits respectively.
6. Subtract Line 6 from Line 1 to determine your tentative tax due. Enter this amount on Line 7.
7. Review all entries for accuracy before submitting. If paying by check or money order, ensure it is made payable to the Illinois Department of Revenue and mail it to the provided address.

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