Illinois State Taxes and Income Tax 2026

The document is the Illinois Department of Revenue Form IL-8453, which serves as an electronic filing declaration for individual income tax returns (IL-1040 or IL-1040-X). It outlines the steps for taxpayers to provide their information, complete tax return details, and authorize direct deposit or electronic funds withdrawal. The form must be signed by the taxpayer and the electronic return originator (ERO), and it includes instructions on how to handle required documents and submissions.

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Click ‘Get Form’ to open the Illinois Individual Income Tax Electronic Filing Declaration in the editor.
Begin by providing taxpayer information. Enter your first name, middle initial, last name, and spouse's details if applicable. Include your mailing address, city, state, ZIP code, and Social Security numbers.
Complete the tax return information by selecting either IL-1040 or IL-1040-X. Fill in net income, tax amount, Illinois income tax withheld, overpayment, total amount due, and your filing status.
If you wish to set up direct deposit for refunds or electronic funds withdrawal for payments, provide routing and account numbers along with the type of account.
Sign the declaration section after ensuring all previous steps are completed accurately. If filing jointly, both spouses must sign.
Finally, attach any required documents such as W-2 forms or 1099 forms as specified in the instructions.

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