How to File Illinois State Taxes
- 1). Obtain a Form IL-1040. You can download the form as a .pdf document from the Illinois Department of Revenue website, or pick up a paper copy from your local library.
- 2). Fill out the form completely and accurately. The form will include your personal contact information, earning history for the previous year, and any exemptions or deductions for which you qualify. Most public libraries offer assistance on filling out the forms if you find them confusing, or you can hire an accountant to do it for you.
- 3). Sign and date the forms in the appropriate spot.
- 4). Mail the forms to the Illinois Department of Revenue. If you owe the state a tax payment, send the form and the check to Illinois Department of Revenue, Springfield, Illinois 62726. If you do not owe the state a tax payment, send the form to Illinois Department of Revenue, PO Box 1040, Galesburg, IL 61402.
- 5). Mail the forms and your check, if applicable, at least one week before April 15th to ensure it reaches the state tax department on time.
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