What Is Presumption of Correctness
Presumption of Correctness is the legal doctrine that places the initial burden on you, the property owner, to prove the assessor's valuation is wrong. In most U.S. jurisdictions, the assessor's assessment is legally presumed accurate unless you present credible evidence to rebut it. This shifts the weight of proof entirely to your side during an appeal.
Why It Matters in Appeals
This doctrine fundamentally shapes how property tax appeals work. At a board of review hearing or formal appeal, you cannot simply disagree with the assessed value. You must demonstrate through concrete evidence that the assessment exceeds market value. The assessor does not have to defend their methodology in the same way you must defend yours.
This is why Burden Of Proof rests with you as the appellant. The assessor starts from a position of legal advantage. Understanding this reality helps you prepare realistic expectations and build a stronger case.
How Assessors Establish Presumption
Assessors create presumption of correctness through documented methodology. They typically use one or more of three appraisal approaches: the sales comparison approach (using comparable sales), the cost approach (replacement cost minus depreciation), or the income approach (for rental properties). If the assessor can show they followed an accepted method, the presumption strengthens.
In many states, assessment ratios (the percentage of market value at which properties are assessed) support presumption. For example, if your state assesses at 100% of market value and the assessor claims comparable sales justify the valuation, that documented ratio creates a legal cushion. You must overcome this with better comparable sales data or evidence the assessment ratio was applied incorrectly.
Rebutting Presumption with Evidence
You overcome presumption of correctness with three primary types of evidence:
- Comparable Sales: Present recent arm's-length sales of similar properties in your market. Sales within the past 12 months carry more weight. The closer the comparable property matches yours in size, condition, location, and sale date, the stronger your case. Most jurisdictions require at least three solid comparables.
- Flawed Assessment Methodology: Show the assessor failed to apply the proper appraisal method, missed major property differences, or used outdated comparables. Document specific errors in their assessment card, property characteristics, or calculation.
- Independent Appraisal: Hire a certified appraiser to produce an appraisal report. A professional appraisal directly challenges the presumption by offering a competing valuation. This is expensive (typically $400-$1,000) but often decisive in contested appeals.
Timing and Jurisdictional Variations
Some jurisdictions weaken presumption of correctness after the initial assessment year. For example, in Illinois, the presumption becomes rebuttable with less stringent evidence after the first appeal. In other states like Indiana, presumption remains strong throughout the appeal process. Check your local taxing authority's rules, as presumption can be modified by statute in your county or state.
File your Appeal within the required deadline, typically 30 to 45 days of assessment notice. Missing this deadline often means you forfeit your right to challenge the presumption entirely.
Common Questions
- Does the assessor have to prove their valuation at a hearing? Not in the same way you do. They must show their assessment follows documented procedures, but the presumption of correctness means they start ahead. You bear the heavier burden of presenting convincing contrary evidence.
- What if I have only one comparable sale instead of three? One comparable is weaker, but not disqualifying. If that comparable is recent, highly similar, and shows a significantly lower value, it can rebut presumption, especially when combined with other evidence like a professional appraisal or documented assessment errors.
- Does exemption status affect presumption of correctness? Exemptions reduce assessed value before presumption applies. If you qualify for a homestead exemption or agricultural exemption, the assessor must grant it first. Presumption of correctness then applies to the remaining assessed value.