Pay Rock Island County, Illinois property taxes online using this service.


How is my property’s assessment determined?

For most non-farm property, the Township Assessor estimates the fair cash value and then develops an assessed value based on 33.33% of that fair cash value of the property as of January 1 of the assessment year, based on the three prior years of sales. The Supervisor of Assessments then equalizes all assessments to provide for uniform valuations in the County. Information about farm assessments can be obtained from the County Assessment Office.

When are taxes due?

Tax statements are mailed early May with Real Estate tax installments due in June, August, September and November. Mobile Home taxes are due in July.

What happens if I don’t pay my taxes on time?

Taxes not paid or postmarked by the due date are assessed 1.5% interest per month until paid or sold at the tax sale.