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What is an Illinois withholding exemption?
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 and other Payee's Illinois Withholding Allowance Certificate and Instructions.
See 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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