Complete Tax

The Illinois personal identification number (IL-PIN) is required for all Illinois taxpayers participating in online e-filing. Taxpayers are provided with their IL-PIN via their IL-1040 booklet or a postcard.

If you do not receive a booklet or a postcard you may use the IL-PIN inquiry system located on the Illinois Taxpayer Assistance Division website. You will need to provide your (and your spouse's) social security number, your name, and either your 9-digit ZIP code, drivers license number, Illinois identification number, or the adjusted gross income (AGI) from your previous year's return.

You may also call Taxpayer Assistance at 1-800-732-8866.