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The official studies are done by the Illinois Department of Revenue. These are done by the county and by township when enough data is available. The Supervisor of Assessments Office also does studies to compare to the Department’s as well as more detailed studies of townships and property classes.
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A mathematical number (multiplier or factor) is applied to a type of property (residential, commercial, etc); a township; or the county as a whole. They are used by local assessors and the State of Illinois for the purpose of improving assessment equity (equality) and/or reaching the State required assessment level of thirty-three and one-third percentage of market value.
Illinois Department of Revenue classes explains that multipliers are used to put assessments at the same level between counties (state multipliers and county multipliers) and between townships (township multipliers). Illinois law states that assessments are to be at one-third of the property's market value.
If the school rate is $3 per 100 of assessed value the difference would be as follows:
Since both properties should be valued at $50,000 based on both being worth $150,000, the $35,000 property needs to be increased by a multiplier/equalization factor of 1.42857.
$35,000 × 1.42857 = $50,000 × $3 divided by 100 = $1,500 paid to the school.
This adjustment results in both properties paying their "fair share" of the tax based on their market values.
Statistical studies called sales ratio studies.
The Illinois Department of Revenue requires forms (Real Estate Transfer Declarations) to be filed with the County Recorder's Office when sales of property take place. These forms contain information on the sale and must be signed by the buyers and sellers of the property.
When the sales are determined by the Department of Revenue to be "arm's length" (advertised in the open market with neither party forced to buy or sell), they are compared to the assessment applied by the local assessor from the year prior, resulting in a sales ratio. The Department then adjusts the results of the ratios by adjustments assessors and multipliers have made to prior year assessments.
These adjustments are made because State law defines one-third of market value assessments as being based on one-third of market value for the three prior years.
State law requires that the sales ratio studies for 2016 be based on sales from 2015, 2014, and 2013. These sales are compared to local assessor's assessments for 2014, 2013, and 2012 respectively, and must be adjusted by the Department's study results of increases and decreases for prior years.
If the local assessor has not reassessed individual properties to the required level and the County Assessor and Board of Review do not apply equalization factors to adjust the county to the state required level – the State Department of Revenue will issue required factors to the County Clerk who must apply them at their level prior to extending (calculating) taxes.
Taxes are increased or decreased by:
Simplified example - if taxing district does not request an increase or decrease in the amount of dollars from the prior year.
Calculate Tax Rate
2015/Pay 2016 2016 Factor 2016/Pay 2017DistrictEqualized Assessed Value 74,000,000 × 1.10 = 81,400,000District Levy ($'s Asked For) 90,000 90,000Tax Rate = Levy/Value .00121622 .00110565
District Levy ($'s Asked For) 90,000 90,000
Tax Rate = Levy/Value .00121622 .00110565
When Equalized Assessed Value goes up and Levy (money asked for by the District stays the same) the Tax Rate goes down accordingly and the taxpayer does not see an increase in taxes.
How Individual Taxpayer would be affected.
Individual Assessed Value 50,000 × 1.10 = 55,000 × ×Tax Rate .00121622 .00110565Tax Bill $60.81 $60.81
Tax Bill $60.81 $60.81
Increases in costs to provide services and State mandated legislation to taxing districts are two reasons tax bills may increase as districts normally must increase their levy amount to cover their increased costs. Even if no equalization factor is applied, the recouping of increased costs to the taxing district will increase the taxes an individual pays.
Simplified example - if the assessment does not change but the taxing district requests an increase in dollars
2015/Pay 2016 2016 Factor 2016/Pay 2017DistrictEqualized Assessed Value 74,000,000 None (1.000) 74,000,000District Levy 90,000 100,000Tax Rate = Levy/Value .00121622 .00135135
District Levy 90,000 100,000
Tax Rate = Levy/Value .00121622 .00135135
When the Equalized Assessed Value stays the same but the Levy (money asked for by the district) goes up, the rate increase, and the individual taxpayer pays more even though his assessment does not change.
Equalized Assessed Value 50,000 50,000 × ×Tax Rate .00121622 .00135135Tax Bill $60.81 $67.57
Tax Bill $60.81 $67.57
If a factor is applied by a township assessor to a neighborhood, property type, etc., it is considered an individual change and the taxpayer will receive a notice and the change is published in the newspaper.
If an equalization factor for a property class or township is applied by the County Assessor or Board of Review the multipliers/factors by law are published in the heading of the newspaper listing of assessment changes for the township when the assessment year's changes are published.
If equalization factors are issued by the Department of Revenue, they are published in local newspapers.
No. Farm Land assessments are based on economic value as established by the State Farmland Assessments Committee and certified to the counties by the Illinois Department of Revenue. Land soil types are increased or decreased by state factors of no more than 10% change per year. Farm homes and home sites are assessed just like any other residential property and are subject to the same equalization factors and multipliers.
Please contact the Supervisor of Assessments Office at 815-434-8233.