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State of Illinois Coronavirus Response Site
An Illinois withholding exemption is the portion of your payments on which you do not withhold Illinois Income Tax. This amount is calculated based on the number of allowances claimed on
Form IL-W-4, Employee’s Illinois Withholding Allowance Certificate.
Booklet IL-700-T, Illinois Withholding Income Tax Tables, for the exact amount of tax to withhold based upon the amount of allowances claimed.
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