A Notice of Valuation can make a homeowner wonder whether the county’s number reflects the home that actually exists, not a generic version of it. A useful property tax appeal evidence checklist begins there: with records that can be checked, sale dates that can be verified, and comparisons that hold up when someone asks why each property belongs in the analysis.
This is not about treating every assessment as a problem. Some assessments are supported by nearby sales. Some appear high relative to credible comparables. Others cannot be tested confidently because the available public record does not provide enough truly similar sales. That distinction matters. Weak evidence is not made stronger by putting it in a thicker stack of paper.
Start With the County Record for Your Home
Before comparing values, confirm that the basic facts in the county record are accurate. Assessment analysis depends on the details assigned to the parcel. If those details are wrong or incomplete, a comparison can point in the wrong direction before sale prices enter the picture.
Review the property classification, recorded living area, year built, lot characteristics, and any other core fields shown in the public record. A difference in living area is especially consequential. A home recorded as substantially larger than it is may be compared against a different segment of the market. Conversely, a home with unrecorded finished space can look artificially small beside nearby sales.
Keep a copy or clear record of what the public record shows. The point is not to build a narrative around every difference between homes. The point is to identify factual inputs that affect whether the comparison is fair.
Separate record errors from value disagreements
A factual discrepancy and a market-value disagreement are not the same thing. If a public record lists the wrong living area or property type, that is a record issue. If the record is accurate but the assessment appears out of step with recent relevant sales, that is a comparison issue.
Treating them separately keeps the evidence clear. It also avoids relying on broad statements such as “my home is worth less than the county says.” The useful question is narrower: do the public facts and qualifying sales support that conclusion?
Property Tax Appeal Evidence Checklist: Comparable Sales
Comparable sales are usually the center of a property tax appeal evidence checklist, but “nearby” alone is not enough. A sale across town, or even a few blocks away in a materially different community, may be less useful than a slightly older sale from the same subdivision.
For a disciplined review, collect the following for each candidate sale:
- The sale price and recorded sale date
- The subdivision or immediate community
- The property classification
- Recorded living area and year built
- Lot and basic property characteristics available in public records
- The reason the sale is comparable, or the reason it should be excluded
The last item is easy to overlook. Exclusions show the work. If a sale has a different classification, falls outside the relevant period, or is much larger or smaller, noting that fact is more credible than quietly using it anyway.
Use a defined sale window
Market conditions change. A sale from years earlier can describe a market that no longer exists, while a very recent sale may fall outside the valuation period relevant to the assessment being examined. Consistency matters more than finding the lowest number in the neighborhood.
LevyRight uses sales from the prior 24 months because a defined window limits cherry-picking while preserving a practical amount of local market evidence. A shorter window can leave too little data in a smaller subdivision. A much wider window can blend different market conditions into one conclusion.
Match living area closely
Square footage is not the whole story, but it is one of the strongest basic indicators of whether two homes belong in the same comparison set. A substantially larger home may sell for more for reasons that have little to do with the subject property’s assessed value.
A practical guardrail is to keep comparable living area within 15% of the home being examined. That does not make every selected sale identical. No two houses are identical. It does prevent the analysis from treating a 1,400-square-foot home and a 2,200-square-foot home as interchangeable simply because they share a ZIP code.
Stay in the subdivision when the data allows it
Subdivision-level evidence can matter in Maricopa County communities where nearby developments differ in age, construction, lot size, amenities, or buyer demand. The same city can contain several distinct markets.
A disciplined method looks for at least five comparable sales within the homeowner’s subdivision. That threshold is not a promise that five sales will always exist. It is a minimum evidence standard. If the record does not produce enough qualifying sales, expanding the search may produce more numbers, but not necessarily better evidence.
We could widen the search until a desired conclusion appears. We do not. Public records, not our opinion, should determine whether there is enough support to make a useful comparison.
Document Differences That Affect Comparability
Two properties can have similar living area and still differ in ways that matter. A pool, corner lot, major remodel, unusual location, or different construction era may influence a sale price. These factors should not become an excuse to dismiss every sale, but neither should they be ignored.
Use public records first. If a characteristic is documented there, note it consistently across the subject property and the candidate sales. If the available record does not reliably show a feature, avoid assigning a precise dollar adjustment based on guesswork.
Photos, listing descriptions, and personal observations can add context, but they are usually less dependable than recorded facts when they are incomplete, outdated, or selective. A listing may emphasize a renovated kitchen while saying little about deferred maintenance, an unusual floor plan, or a location next to a busy road. Context helps. It should not replace a clear comparison method.
Check the Assessment Against the Evidence Set
Once the property record is confirmed and the comparable sales are screened, compare the county assessment with the range suggested by the qualifying sales. Do not focus only on the single lowest sale. One transaction can be unusual for many reasons, including condition, timing, or circumstances that public records do not fully explain.
Look instead for a pattern. Are multiple similar homes in the same subdivision, sold within the defined period, pointing in a similar direction? Is the assessment generally in line with that evidence? Or does the available set conflict sharply enough with the assessed value to merit closer attention?
There are three honest outcomes: the assessment appears higher than the comparable-sale evidence, it appears in line with the evidence, or the data is insufficient to support a reliable conclusion. The third outcome is not a failure. It is a limit of the record, and saying so is more useful than manufacturing confidence.
Keep Your Evidence Organized and Reproducible
A homeowner reviewing an assessment should be able to explain each item without relying on a valuation slogan. Maintain a simple worksheet or folder showing the subject property’s public-record details, the selected sales, excluded sales, dates, source fields, and the comparison rules used.
Consistency is the test. If a sale is included because it is close in size and in the same subdivision, apply that standard to every candidate sale. If a sale is excluded because it is too old, do not bring it back only because its price is favorable. An evidence set becomes more credible when another person can follow the choices and reach the same understanding of the data.
This is also where privacy deserves attention. You do not need to hand over contact information just to see whether public records provide a meaningful comparison. A responsible assessment check can begin with an address, public parcel data, and a stated method – no sales pitch required.
When the Checklist Says “Not Enough Data”
Some homes are hard to compare. Newer subdivisions may have limited resales. Custom homes can vary too much from one property to the next. A property with unusual features may not have five nearby matches within a reasonable size range and time window.
That does not mean the assessment is necessarily correct or incorrect. It means the available comparable-sale evidence does not support a clean conclusion under the chosen rules. Expanding the search too far, relaxing size limits, or mixing classifications can create the appearance of precision without the substance.
A sound property tax appeal evidence checklist is valuable precisely because it can produce a restrained answer. When the data supports the assessment, it should say so. When it does not, it should show why. And when the evidence is thin, the honest result is to leave the conclusion open rather than force one.
