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A Sale Ratio Study is the primary tool in conducting the equalization process. The Sales Ratio Study provides the Median Level of Assessments for the current year (2011) based on the 3 previous year's worth of VALID sales (2010, 2009, 2008). This is a statistical analysis, excluding INVALID sales, encompassing a wide geographic area, such as an entire county, township or neighborhood. A Sales Ratio Study is used to calculate the ratio of the assessment to the sale. In Illinois, this ratio is to be 33.333% of the market value of the property.
The compiled sales ratios from year to year give the IL Department of Revenue an indication of the overall market trend as compared to the existing assessments in a jurisdiction. If the sale study ratios are predominately below 33.333% the assessments must be increased; if above 33.333% the assessments must be decreased. The State advises each County of the results of this annual study. In turn, the County compiles sales studies for each Township and advises the Township Assessor of the overall increase or decreased of the Townships assessments on order to determine the current year's equalization factor. Rockford Township's 2011 Equalization factor is .9501 which equates to a 4.99% reduction. View other Township Equalization Factors.
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