SmartAsset's Illinois paycheck calculator shows your hourly and salary income after federal, state and local taxes. Use Gusto's salary paycheck calculator to determine withholdings and calculate take-home pay for your salaried employees in Illinois.Use Gusto's hourly paycheck calculator to determine withholdings and calculate take-home pay for your hourly employees in Illinois. This Illinois payroll calculator makes it easy for anyone to quickly run payroll in Illinois, or look up 2024 state tax rates. We'll cover how to do payroll in Illinois, with explanations of the most important taxes and labor laws that affect payroll. If you're wondering, "How do I figure out how much money I take home in Illinois?" we've got you covered. You must review Out of State Tax Withholding to determine which tax forms you need to complete. If both the worker and the employer agree to withhold federal income tax, employers can withhold.