Laws.com Legal Forms Guide Form IL - 1040 is the individual income tax return for Illinois residents. Both residents and non-residents file their state income tax using this form, which can be found on the website of the Illinois Department of Revenue. Here are the steps for completing the form: 1. If you are not filing on a calendar year basis, provide the ending month and year of your fiscal year. 2. Enter your social security number, as well as your spouse's if filing jointly. 3. In Section B, provide your name and address, as well as your spouse's first and last name if different and filing jointly. 4. On line C, indicate your filing status by checking the appropriate . 5. On line D, check the if you are a member of a same-sex civil union. 6. On lines one through four, document your income as instructed. 7. On lines five through ten, calculate and document your base income as directed. 8. On lines 10a through 10d, note all applicable exemptions being claimed. 9. Residents calculate their net income on line 11, while non-residents and part-year residents do so on line 12. 10. Residents calculate their tax on line 13, while non-residents and part-year residents do so on lines 14 and 15. 11. Calculate your tax after the application of non-refundable credits on lines 16 through 20. Transfer the value on line 21 to the second page on line 22. 12. Calculate other taxes on lines 22 through 24, if applicable. 13. Apply payments already made and refundable credits on lines 25 through 29. Overpayments should be entered on line 30, while underpayments should be entered on line 31. 14. If you have underpaid, complete lines 32 through 34. If you have overpaid or are due a refund, complete lines 35 through 39. To watch more videos, please visit laws.com.
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Video instructions and help with filling out and completing What Form 2350 Individuals
