Agencies
Services
News – Thursday, May 29, 2025
2024 Cook County Final Multiplier Announced
A final 2024 property tax equalization factor of 3.0355 for Cook County was announced today by the Illinois Department of Revenue.
The Department is required by law to calculate the factor, often called the multiplier, to achieve uniform property assessment throughout the state.
The Department determines the equalization factor for each county by comparing a three-year period the actual selling price of individual properties to the assessed value placed on those properties by the county assessor. If the median level of assessment for all property in the county varies from the 33 1/3 percent level required by law, an equalization factor is assigned to bring assessments to the legally mandated level.