McDonough County Property Tax Due Date

Illinois has one of the most distinctive property tax systems in the country: taxes are paid one year in arrears. This means the taxes you pay in 2025 are for the 2024 tax year. This delayed billing cycle can catch new homeowners off guard — when you purchase a home in Illinois, you will typically receive a credit at closing for the prior year's unpaid taxes. Property taxes in Illinois are administered at the county level. County assessors (or township assessors in some areas) set property values, the county board of review hears appeals, the county clerk calculates tax rates, and the county treasurer bills and collects. Tax rates vary significantly depending on the number of overlapping taxing districts — counties, municipalities, school districts, park districts, fire protection districts, and others — affecting your property.