2023 IL-505-I Automatic Extension Payment for Individuals Filing Form IL-1040-2026

1. Click ‘Get Form’ to open it in the editor.
2. Begin by entering your Social Security number and your spouse’s Social Security number, if applicable, in the designated fields.
3. Fill in your first and last name along with your spouse's name, ensuring all names match those on your federal return.
4. Complete the Tax Payment Worksheet on the back of the form. Start with Line 1 by entering the total amount of individual income tax you expect to owe.
5. Continue filling out Lines 2 through 6, detailing any withholding, estimated payments, and credits to calculate your tentative tax due on Line 7.
6. If Line 7 shows a tentative tax due of $1 or more, ensure you include this amount with your payment. If less than $1, do not file this form.
7. Finally, review all entries for accuracy before submitting. Print and mail the completed form along with your payment to the Illinois Department of Revenue.

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