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Refund Alert: Enhanced identity theft prevention measures and security protocols will lengthen timeframes for refund issuance.

IL-1040-V and IL-1040-ES Alert: If paying by a paper check, make sure that the voucher (IL-1040-V and IL-1040-ES) sent with the payment shows the correct scan line. The voucher should display the full Social Security number. The scan line at the bottom of the voucher should not contain any asterisks or other symbols. The full Social Security number information in the scan line helps the payment be quickly applied to the correct account – avoiding errors and delays.

Note: Effective January 1, 2016, the Individual Income Tax exemption amount increased from $2,150 to $2,175. Booklet IL-700-T, Illinois Withholding Tax Tables for 2016, is now available on our website. Booklet IL-700-T provides formulas and tables for employers to calculate the amount of tax to withhold from employee paychecks.

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  • Substitute Forms Developers
    If you produce, or intend to produce, your own version of the official tax forms, you can find information here about our technical specifications, enrollment, and testing requirements.