What Evidence Actually Supports a Property Tax Grievance
What evidence do I need to grieve my property assessment?
A property tax grievance is decided on evidence that your home's assessed value exceeds its actual market value — mainly comparable sales of similar nearby homes, a recent purchase price, an independent appraisal, or documentation of a factual error in the property's record. A grievance built only on the feeling that taxes are too high, without that kind of evidence, is a much harder case to make.
Comparable Sales Are the Core of Most Cases
The most commonly used evidence is a set of recent sales of homes genuinely comparable to yours — similar size, age, condition, and location, sold close enough in time to be relevant. The goal is showing what the market actually paid for homes like yours, and comparing that to what your assessment implies your home is worth.
A Recent Purchase Price
If the home was bought recently in an arm's-length sale — meaning a genuine market transaction, not a sale between relatives or as part of an estate — that purchase price can be relevant evidence of market value, though it's typically weighed alongside other evidence rather than treated as automatically controlling.
An Independent Appraisal
A professional appraisal, prepared specifically to address market value as of the relevant date, carries weight because it comes from someone qualified to value real estate and applies a recognized methodology. This is a more expensive route than pulling comparable sales yourself, and whether it's worth the cost usually depends on how much money is actually at stake in the assessment reduction being sought.
Errors in the Property Record
Every property has a record card on file with the assessor listing details like square footage, number of bedrooms and bathrooms, lot size, and condition. These records sometimes contain outdated or simply incorrect information — a renovation that was never removed from the record, a bathroom count that's wrong, square footage that doesn't match the actual structure. Correcting a factual error like this can be a straightforward basis for a grievance.
Photos and Condition Documentation
Photos documenting a condition problem — deferred maintenance, structural issues, storm damage — can support an argument that the property's condition doesn't match what the assessment assumes. This is generally supporting evidence rather than a full case on its own, and works best paired with comparable sales or an appraisal.
What Doesn't Move the Needle
A general belief that taxes are too high, comparisons to what a neighbor's bill is without underlying sales data, or complaints about the tax rate itself rather than the assessed value, generally don't support a grievance on their own. The process is specifically about whether the assessed value reflects market value — not about whether the overall tax burden feels fair.
When it is worth a call
- You're gathering comparable sales and want help identifying the most relevant ones
- You've found a factual error on your property record card
- You're weighing whether a paid appraisal is worth the cost for your situation
- You're preparing evidence for a SCAR hearing after an initial grievance
Common questions
- Do I need a professional appraisal to grieve my assessment?
- No, an appraisal isn't required — comparable sales data and documentation of any factual errors on the property record are often enough. An appraisal is an additional option, generally worth considering when more is at stake or the comparable sales are less clear-cut.
- How many comparable sales do I need?
- There's no fixed number required, but a single sale is a thinner case than several genuinely comparable properties. More relevant, well-matched comparables generally make for a stronger presentation.
- Can I use online estimated home values as evidence?
- Automated online valuation estimates are generally not treated as reliable evidence on their own — actual closed sales of comparable properties, or a professional appraisal, carry more weight.
- What if my property record has the wrong square footage?
- That's a factual correction worth raising directly, since assessments are often built in part on the recorded characteristics of the property. Documentation like a survey, floor plan, or the discrepancy itself can support the correction.
Talk it through with Mitch
Bring the situation, not a diagnosis. A short conversation usually makes the next step obvious.