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W-4? If you are an employee, you must complete this form so your employer can withhold the correct amount of Illinois Income Tax from your pay. The amount withheld from your pay depends, in part, on the number of allowances you claim on this form.
2024 Withholding (Payroll) Tax Forms. Click here to file your IL-941 return or pay your IL-501 in MyTax Illinois. Click here for information about filing your W-2s and 1099s. Form.
You must file Form IL-W-4 when Illinois Income Tax is required to be withheld from compensation that you receive as an em-ployee. You should complete this form and give it to your employer on or before the date you start working for your employer. You may file a new Form IL-W-4 any time your withholding allowances increase.
Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. If too little is withheld, you will generally owe tax when you file your tax return and may owe a penalty. If too much is withheld, you will generally be due a refund.
For information and forms related to unemployment insurance tax, visit the Illinois Department of Employment Security’s website at ides.illinois.gov
Visit the Illinois Department of Revenue (IDOR) website and download the latest version of the IL-W-4 form from the Withholding Tax Forms portal. Review your current Form IL-W-4 for sections and details that are no longer up-to-date, such as your age, number of dependents, and additional allowances.
Form IL-W-4 and sign and date the certificate. Do not complete Lines 1 through 3. If you are a resident of Iowa, Kentucky, Michigan, or Wisconsin, or a military spouse, see Form W-5.