Assessor -- Market Value, Tax Levies & Assessed Values


What is Market Value? Market value of a property is an estimate of the price that it would sell for on the open market on January First of the year of assessment. This is sometimes referred to as the "arms length transaction" or "willing buyer/willing seller" concept.

How does the Assessor Estimate Market Value? To estimate the market value of your property, the Assessor generally uses three approaches. The first approach is to find properties that are comparable to yours which have sold recently. Local conditions peculiar to your property are taken into consideration. The assessor also uses sales ratio studies to determine the general level of assessment in a community, in order to adjust for local conditions. This method is generally referred to as the MARKET APPROACH and usually considered the most important in determining the value of residential property. The second approach is the COST APPROACH and is an estimate of how many dollars at current labor and material prices it would take to replace your property with one similar to it. In the event improvement is not new appropriate amounts for depreciation and obsolescence would be deducted from replacement value. Value of the land then would be added to arrive to the total estimate of value. The INCOME APPROACH is the third method used if your property produces income such as an apartment of office building. In that case, your property could be valued according to its ability to produce income under prudent management; in other words, what another investor would give for a property in order to gain its income. The income approach is the most complex of the three approaches because of the research, information and analysis, necessary for an accurate estimate of value. This method requires thorough knowledge of local and national financial conditions, as well as any developmental trends in the area of the subject properly being appraised since errors or inaccurate information can seriously affect the final estimate of value.

Why Values Change State law requires that all real property be reassessed every two years. The current law requires the reassessment to occur in odd numbered years. Changes in market value as indicated by research, sales ratio studies and analysis of local conditions as well as economic trends both in and outside the construction industry are used in determining your assessment.   If you disagree with the assessor's estimate of value, please consider these two questions before proceeding, as outlined below: 1. What is the actual market value of my property? 2. How does the value compare to the similar properties in the neighborhood? If you have any questions about the assessment of your property, feel free to come in and discuss it with the assessor. You may file a written protest with the Board of Review, which is composed of five members from various areas of the assessing jurisdiction. The Board operates independently of the assessor's office, and has the power to confirm or to adjust either upward or downward any assessment. If you are not satisfied with the decision of the Board of Review you may file an appeal to the "Property Assessment Appeal Board" or district court within twenty days after adjournment of said Board, or twenty days after May 31st whichever is latest.

Tax Levies and Assessed Values There are a number of different taxing districts in a jurisdiction, each with a different levy. Each year the County Auditor determines for that district a levy that will yield enough money to pay for schools, police and fire protection, road maintenance and other services budgeted for in that area. The tax levy is applied to each $1,000 of a properties taxable value. The value determined by the assessor is the assessed value and is the value indicated on the assessment roll. The taxable value is the value determined by the auditor after application of state ordered "rollback" percentages for the various classes of property.


  • January 1 - Effective date of current assessment
  • April 2 - 25 Taxpayers may request informal review of assessments by assessor office personnel
  • April 2- 30  Protest of assessment period for filing with the local Board of Review
  • May 1 through adjournment - Board of Review meets each year
  • October 16 through October 25 inclusive - Protest period for filing with Board of Review on those properties affected by changes in value as a result of the Director of Revenue and Finance Equalization Orders (odd numbered years)
  • January 1 through December 31 - Period for filing for Homestead Credit and Military Exemption.  One time filing is provided, by statute, unless the property owner is (1) filing for a Military or Homestead Credit the first time; (2) has purchased a new or used home and is occupying the property as a homestead as of July 1st; or (3) owner was using as a homestead but did not previously file.


 If the home qualifies and the property owner files on or before July 1, the exemption will go into effect for the current assessment year. If the property owner files after July 1, the exemption will go into effect the year following the sign up. Filing is required on the following, if provisions have been made for exemptions as required:





Recreational Lake

Impoundment Structures

Forest Cover

Native Prairies


Open Prairies

Disabled Veterans Homestead Credit

River and Stream Banks


Family Farm Credit

Forest Reservations

Pollution Control

Fruit Tree Reservations - 8 years

Wildlife Habitat


Urban Revitalization

Industrial Partial 427B


Things To Remember Assessed value and taxable value are not synonymous terms.

  • Property is assessed as of January First.
  • Property is reassessed every two years.

Taxes are levied on a value determined by the auditor by applying a "roll back" percentage to the assessed value and deducting any applicable exemptions or credits. The "roll back" percentages vary each year.

On values determined as of January First, one does not stand to pay taxes until eighteen months later. The "roll back" is the percentage of actual value that is determined by the Director of Revenue each year on classes of property where the total value increase STATEWIDE, exceeds four percent for each class of property. The percentages so determined by the Director of Revenue are certified to and applied by the local county auditor to all property in each class affected throughout the State. Percentages determined by the Director of Revenue are the same for all the assessing jurisdictions in the State.

Increases in assessed value of individual parcels of property as determined by the assessor, may exceed four percent within a jurisdiction. Agricultural property, except agricultural dwellings, is assessed on the basis of productivity and net earning capacity using a five year crop average and capitalized at the rate set by the Legislature. The rate is currently seven percent. Tentative and final equalization orders are issued by the Director of Revenue in odd numbered years on or about August 15th, and October 1st respectively. The orders are sent to the various county auditors who apply them to the classes of property affected, if any.

Assessors and members of the Board of Review are appointed to their terms of office. Assessors, in addition to completing the required 150 hours of Continuing Education, must be approved by a majority vote of the Conference Board in order to be reappointed. If you desire further information, have questions concerning PROPERTY VALUES or other information relating thereto, it should be addressed to the assessor's office in the respective jurisdiction and not the Board of Supervisors or Treasurer. The assessors of Iowa hope the information contained herein will be of value to the property owner and has clarified some of these problems and issues relating to assessment and the applicable laws.


*This information was prepared by the Public Relations Committee of the Iowa State Association of Assessors