The calculation can be complex. You must file Form IL-1040 and include as Illinois income any compensation you received from an employer in these states.Disability benefits are not subject to Illinois state income taxes. Illinois State Disability Insurance (SDI) Rates. Use the following pages to complete your Illinois State and Federal income tax withholding, or W-4 information. MOPD can assist you in completing an online application with the State of Illinois's Benefit Access Program. Illinois ABLE helps people with disabilities save for qualified disability expenses without risking loss of their benefits from assistance programs. Apply online for tax years 2019 through 2023. If you have a disability rights-related complaint, please complete and submit the form below. Unemployment compensation is taxed in Illinois as part of your adjusted gross income, whether you're a resident or were employed in the state.