Illinois withholding income tax payments are made on Form IL-501, Withholding Payment Coupon, and Illinois withholding is reported on Form IL-941, Illinois Withholding Income Tax Return. IMPORTANT: Make sure to use the correct version of Form IL-941 for the liability period you are filing.
If you have more than one job or your spouse works, your withholding usually will be more accurate if you claim all of your allowances on the Form IL-W-4 for the highest-paying job and claim zero on all of your other IL-W-4 forms.
How does Illinois's tax code compare? Illinois has a flat 4.95 percent individual income tax rate. Illinois has a 9.5 percent corporate income tax rate. Illinois also has a 6.25 percent state sales tax rate and an average combined state and local sales tax rate of 8.86 percent.
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.
Illinois employs a flat income tax system with a single rate of 4.95%, which can significantly impact your net income. While simpler than some other states' graduated systems, Illinois' tax code includes various deductions and credits that affect your paycheck.
Illinois withholding is reported on Form IL-941, Illinois Withholding Income Tax Return. All Form IL-941 returns are due quarterly by the last day of the month that follows the end of the quarter. You must file Form IL-941 even if no tax was withheld during the reporting period.
If you do not file a completed Form IL-W-4 with your employer, if you fail to sign the form or to include all necessary informa- tion, or if you alter the form, your employer must withhold Illinois Income Tax on the entire amount of your compensation, without allowing any exemptions.
The IL-W-4 form is fairly straightforward. The employee must enter their name, social security number, street address, city, state, and zip code. They must also indicate the number of allowances they want to claim or are legally allowed to claim.