Follow the steps to fill out the IL IL-425 accurately and efficiently.

1. Press the ‘Get Form’ button to access the IL IL-425 form online and open it in your preferred editor.
2. In the first section, identify yourself by entering your full name and Social Security number in the provided fields. If applicable, input your spouse’s name and Social Security number as well.
3. Complete your mailing address, including your city, state, and ZIP code. Additionally, provide a daytime phone number where you can be reached.
4. In the second section, respond to whether you have filed a tax return with the Illinois Department of Revenue for the current tax year by selecting 'Yes' or 'No'. If your answer concerns a prior tax year, indicate that year in the designated field.
5. For the third section, attach the required identity verification documents. Choose one document from each of the two categories specified: Category 1 should include a photo ID, and Category 2 should provide proof of your address matching the tax return.
6. If you would like to add any additional notes, you may use the optional space provided. Otherwise, proceed to submit the form.
7. Finally, save your changes, then download, print, or share the form as needed. Ensure you send it to the Illinois Department of Revenue, Anti-Fraud Unit, at the provided mailing address.

Complete your IL IL-425 form online today to ensure your identity verification is processed promptly.