Illinois property tax rate calculator
Note: You must include your Property Index Number on Schedule ICR, Illinois Credits, if you are claiming a property tax credit. You may get this number from your property tax bill, your assessment notice, your mortgage lender (if your property taxes are escrowed), or from the county assessor's office in which the property is located. How to Calculate Property Taxes in Illinois. In a fiscal year 2009 report on the nation's state and local tax collection rankings, the website TaxFoundation.org ranked Illinois as ninth in the country for amount of property tax. Property owners in the state, the report found, paid an average of $1,782 annually, Illinois lottery winnings each time a single payment is over $1,000 for both Illinois residents and nonresidents, and other gambling winnings paid to an Illinois resident if the winnings are subject to federal income tax withholding requirements.