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Property tax basics

What Is Overassessment on Your Property Tax Notice?

FairAppeal Editorial Team · August 21, 2026 · 2 min read

Overassessment is a printed value above what the home would sell for, or above the uniform level on similar parcels. The stake is extra tax every year.

Overassessment is a printed value above what the home would sell for, or above the uniform level used on similar parcels. The stake is extra tax every year the high figure stays on the roll. A property tax appeal, when one is filed, is a later request that the printed number come down.

What does overassessment mean on a property tax notice?

The IAAO glossary treats assessment level as the relationship between assessed value and market value. Overassessment is that relationship running high: the printed number sits above a fair sale, or above the fraction the county applies to comparable homes. Uniformity is the neighbor test. Market is the sale-price test. Either miss can show up as extra millage math.

Example: the house would sell for $200,000, but the roll says $250,000. Ten mills on the extra $50,000 is $500 of extra tax that year. That gap is an example of the stake, not a case file.

Look up if you are overpaying.

How does overassessment raise a property tax bill?

Millage multiplies whatever number was printed. A high print produces a high bill until the next roll is written. The property tax glossary and the assessed value page keep that parent number in view. FairAppeal reviews your property and decides whether to file, and you pay only if Fair Appeal's work actually lowers the tax.

Frequently asked questions

What is overassessment?
Overassessment is a printed value above what the home would sell for, or above the uniform level used on similar parcels. The extra dollars repeat each year the high figure stays on the roll. A property tax appeal is a later request that the print come down.
How does overassessment affect a property tax bill?
Overassessment raises a property tax bill because millage multiplies the printed number. If the roll is $50,000 above a $200,000 sale-price idea, ten mills on that extra slice is $500 more tax for the year. The high print is what costs money.
Is overassessment the same as a high millage rate?
Overassessment is not a high millage rate. Overassessment is a value problem: the print sits too high. Millage is the local rate applied to whatever value was printed. A property tax appeal is aimed at the value, not at rewriting the district's mills.