Il 505 i 2026

1. Click ‘Get Form’ to open the 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. Complete the Tax Payment Worksheet on the back of the form. Start with Line 1, where you will enter the total amount of individual income tax you expect to owe.
4. Proceed to Line 2 and input any Illinois Income Tax withheld from your wages or other income for the tax year.
5. Continue filling out Lines 3 through 6, ensuring you accurately calculate your total tax payments and credits.
6. Finally, round your tentative tax due on Line 7 and ensure all information is correct before submitting your form along with payment.

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