State of illinois taxes 2026

1. Click ‘Get Form’ to open the Illinois Form IL-1040 in the editor.
2. Begin by entering your personal information in Step 1. Fill in your name, Social Security number, and mailing address. Ensure all details are accurate, as this is crucial for processing your tax return.
3. In Step 2, report your income. Start with your federal adjusted gross income from your federal Form 1040. Include any federally tax-exempt interest and other additions as required.
4. Proceed to Step 3 to calculate your base income. Subtract any allowable subtractions from your total income to determine your Illinois base income.
5. In Step 4, enter exemptions for yourself and any dependents. This will help reduce your taxable income.
6. Continue through Steps 5 to 13, carefully filling out each section regarding net income, tax calculations, payments, and refunds. Review each entry for accuracy before submission.

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