A Notice of Valuation can create an immediate, expensive-sounding question: should I appeal my property taxes? The useful first question is narrower: does the county’s assessed value appear to be supported by recent sales of homes genuinely comparable to yours?
That distinction matters. A home may have a higher assessed value than last year, or a value that feels out of step with a neighbor’s, without the public record providing a strong basis to challenge it. Conversely, a number can look ordinary at a glance but sit above the evidence from similar, nearby recorded sales. The answer should come from the records, not from a sales pitch.
Should I appeal my property taxes, or just verify the assessment?
For Maricopa County homeowners, the assessment is a county opinion of value for a defined valuation process. It is not automatically your home’s current listing price, the amount you paid years ago, or the value shown on a real estate website. Those figures can be useful context, but they are not interchangeable.
The most reliable starting point is to compare the assessment with a disciplined set of recorded local sales. That means looking at homes that are similar in the ways likely to affect value and that sold close enough in time to reflect the market the county was measuring.
A credible assessment check may reach one of four conclusions: the assessed value appears higher than comparable-sale evidence supports, it is generally in line with the evidence, it appears lower, or there simply is not enough suitable public data to support a conclusion. The last result is not a failure. It is an honest limit on what the available records can show.
Tools that treat every homeowner as a prospective appeal customer have little reason to tell someone that the evidence is thin or that the assessment looks supported. Homeowners deserve that answer anyway.
What makes a sale genuinely comparable?
The word “comparable” does a great deal of work. A sale across town, a home with a substantially different size, or a transaction from several years ago may be real data, but it may not be useful evidence for evaluating your assessment.
A disciplined comparison begins with the same property classification. A detached single-family house should not be casually compared with a townhouse, condominium, manufactured home, or a property with materially different characteristics. The goal is not to collect the largest possible number of sales. It is to identify the sales that answer the right question.
Living area also matters. A 1,400-square-foot home and a 2,500-square-foot home can be in the same subdivision yet occupy different parts of the market. Keeping living area within 15% helps prevent large size differences from driving the comparison.
Time matters just as much. Sales from the prior 24 months are generally more relevant than stale transactions, particularly in communities where prices have moved quickly. A distant sale may be tempting when nearby evidence is limited, but widening the search can make a result look more certain than it is.
Subdivision is another useful guardrail. Neighborhood boundaries can capture differences in construction era, lot patterns, homeowner association features, school-area perceptions, and buyer demand that a ZIP code cannot. Five or more qualifying sales within the same subdivision provide a more meaningful evidence base than a handful of loosely similar homes scattered across a city.
LevyRight applies those rules openly: same classification, living area within 15%, sales within the prior 24 months, and at least five qualifying sales in the homeowner’s subdivision. We could widen the search when the data are sparse. We don’t. A broader pool is not automatically a better comparison.
Why a neighbor’s value may not settle the question
Comparing your notice with a neighbor’s is understandable. You can see the house, know the street, and may assume the homes are nearly identical. But assessments can differ for legitimate record-based reasons, including living area, lot size, construction details, additions, property classification, or recorded characteristics that are not obvious from the curb.
There is also a more basic issue: two properties can have similar assessed values while both are out of line with local sales, or different assessed values while each is reasonably supported by its own property record. A single neighbor is a data point, not a market analysis.
The same caution applies to a recent sale on your block. One transaction can be unusual because of condition, timing, concessions, remodeling, family circumstances, or other facts not visible in a simple sale record. Multiple closely matched sales reduce the chance that one atypical transaction controls the picture.
Read the result as evidence, not a promise
A good assessment analysis should show its work. At a minimum, homeowners should be able to understand the public-record inputs, the sales window, the location boundary, the size range, and the number of sales used. If a tool cannot explain why a sale was included, excluded, or treated as comparable, its conclusion is harder to evaluate.
It is also worth separating an assessment check from a prediction. Public records can indicate whether an assessed value appears supported by a defined body of local comparable-sales evidence. They cannot account for every interior condition issue, every correction that may be needed in a property record, or every fact that may be relevant in an individual situation. They also cannot guarantee a particular outcome or savings.
That is why restrained language is more useful than a confident-sounding promise. “Higher than supported” means the defined comparison produced evidence worth understanding. “In line” means the available comparable sales generally support the assessment. “Insufficient data” means the records did not meet the threshold for a dependable conclusion. None of those labels substitutes for the homeowner’s judgment.
Common reasons an assessment check can mislead
The most common problem is using sales that are convenient rather than comparable. An online estimate may pull from a broad radius, use a generic price-per-square-foot calculation, or rely on records that do not reflect the characteristics of the home being evaluated.
Another problem is assuming every increase is an error. Market movement, construction changes, and updated county records can all affect an assessment. The direction of change alone does not establish whether the new number is supported.
Finally, do not confuse a lack of evidence with evidence of a problem. In a newer subdivision with few recorded resales, a rural area with highly varied homes, or a neighborhood with unusual property types, there may not be five closely matched sales inside the relevant boundary. A responsible analysis should say so rather than fill the gap with weaker comparisons.
A practical way to evaluate your notice
Start with the property details shown in the county record. Check basic facts such as classification, living area, and other visible characteristics. Small record differences can affect an assessment, and they can also distort a comparison if left unnoticed.
Then look for recent sales that meet consistent rules rather than choosing the lowest nearby prices. Ask whether the homes share the same classification, fall within a reasonable size range, sold within the relevant time frame, and are located in the same subdivision. Count the qualifying sales. If there are fewer than five, the responsible answer may be that the data do not support a reliable comparison.
Keep the source clear throughout. County assessment records and recorded sales are public records. They are stronger than a generic estimate because you can inspect the method used to compare them. They are not our opinion, and they should not be presented as certainty where the records are incomplete.
For homeowners who want a quick, private first look, an account-free assessment check can remove some of the friction. No address should need to become a lead to be useful. A result that says “not supported” or “not enough data” can be just as valuable as one that identifies a potential mismatch.
The most helpful next step is often the least dramatic one: verify the facts, insist on comparable evidence, and let the public record set the limits of the conclusion. That honesty is the whole point.
