The Rollback Rate is an annual statewide rate set annually for each property class by the Iowa Department of Revenue. In effect, the rate of growth in value for a given property class may be limited by the rate of growth in the value of another property class. Somewhat similar to two people tied together in a three-legged race, neither property class can get too far ahead of the other one.
How is taxable value calculated?
Taxable Value for most properties is calculated by multiplying the Rollback Rate for the correct property class by the equalized 100% Actual Value. Taxable Value for gas and electric utility property is calculated by the Iowa Department of Revenue.