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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.
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.
If you have additional inquiries, you may submit them to the Questions, Comments, or Request form.