Updated August 17, 2026. This guide provides general appraisal information and is not legal, tax or accounting advice.
Read the assessment record first
Check the parcel identification, land size, building size, style, age, condition, finished areas, outbuildings and exemptions. A factual record error can be important even before market value is debated.
Ask the assessor how the equalization rate or residential assessment ratio affects comparison between assessed value and full market value in that jurisdiction.
Match evidence to the valuation date
Sales used in an assessment challenge should be relevant to the municipality's valuation date and the property type. A sale occurring much later may reflect a different market.
The strongest evidence explains similarities and differences rather than presenting a list of nearby transactions without analysis.
Know when an appraisal may help
Independent appraisal evidence may be useful for a high-value home, unusual acreage, waterfront property, major condition issue, mixed residential utility or a case where the financial stakes justify the cost.
For a straightforward difference, public records and a focused comparable-sales presentation may be enough. The local filing rules and deadlines control.
Keep the process factual
Assessment review is more effective when the argument is organized around property facts, market evidence and the required valuation standard. Photographs, repair estimates and surveys can support relevant claims.
Legal advice and filing strategy should come from the appropriate professional. An appraiser should not guarantee an assessment reduction.
Planning checklist
- Obtain the current assessment record
- Verify the applicable valuation date
- Check square footage, land and improvement data
- Review the local equalization information
- Collect relevant sales and property photographs
- Confirm grievance deadlines and required forms
- Evaluate whether appraisal cost is justified by the tax impact
Describe the property, intended use and required effective date before scheduling so the scope can be matched to the assignment.
Request an AppraisalFrequently asked questions
Is assessed value always equal to market value?
Not necessarily. Local assessment practices and equalization factors can affect how the assessment relates to full market value.
Can an appraiser guarantee a reduction?
No. The appraiser can provide an independent value opinion and supporting analysis; the assessor, board or court decides the outcome.
Does a recent purchase price settle the issue?
A recent arm's-length sale can be important, but the circumstances, property changes and applicable valuation date still need analysis.
Should deferred maintenance be documented?
Yes. Material condition issues should be supported with clear photographs, access and, where useful, contractor or engineering information.