Most Texas homeowners who protest their property taxes focus on one question: Is my home really worth what the appraisal district says it is? That's a reasonable place to start — but it's only half the picture. There's a second, independent ground for protest that is both legally powerful and widely underused: unequal appraisal.
Understanding how it works changes how you think about your property tax bill — and why protesting makes sense even in years when values are genuinely rising.
Unequal appraisal is a condition where your property is assessed at a higher ratio of value to market than comparable properties in your area. Texas law requires all property to be taxed equally and uniformly. If yours isn't — even if the absolute dollar value seems defensible — you have a legal right to force a reduction.
The Law Behind It: Texas Tax Code Section 42.26
The right to protest on unequal appraisal grounds comes directly from Texas Tax Code Section 42.26, which states that a property is appraised unequally if:
- The appraisal ratio of your property exceeds by more than 10% the median appraisal ratio of a reasonable and representative sample of comparable properties
- The appraisal ratio exceeds by more than 10% the median appraisal ratio of comparable properties within the same appraisal district
- The appraised value exceeds the median appraised value of a reasonable and representative sample of comparable properties after applying each property's appraisal ratio
In plain language: if your home is being taxed at a higher effective percentage of its real value than your neighbors' comparable homes, the law says that's not allowed — and you can make the district fix it.
Two Ways to Protest, One Deadline
It helps to understand that market value and unequal appraisal are two separate, independent legal arguments. You can raise both in the same protest. An experienced agent will analyze which argument produces the larger reduction and lead with that — or use both when they're independently strong.
Market value protest: You argue the appraised value exceeds what your property would sell for. Evidence is closed sales of comparable properties. Works best when recent sales clearly support a lower value.
Unequal appraisal protest: You argue that comparable properties in your area are taxed at a lower effective rate. Evidence is the CAD's own property records showing the appraised values and sales prices of similar homes. Works regardless of whether your absolute value is defensible.
Both arguments share the same protest deadline: May 15, 2026 (or 30 days after your notice date, whichever is later). You file once and raise both grounds in the same proceeding.
The Appraisal Ratio: What It Is and Why It Matters
The appraisal ratio is the key concept behind unequal appraisal. It's calculated as:
Appraisal Ratio = Appraised Value ÷ Sale Price (Market Value)
If your home is appraised at $550,000 and its actual market value is $500,000, your appraisal ratio is 1.10 — meaning you're being taxed on 110% of market value. If your neighbors' comparable homes have a median appraisal ratio of 0.95 (taxed at 95% of market value), there's a 15-point spread. Under Section 42.26, you're entitled to have your value reduced to bring your ratio in line with the median.
Why Unequal Appraisal Is Widespread in Texas
Mass appraisal — the method used by every Texas CAD to value hundreds of thousands of properties simultaneously — is inherently imprecise. Districts use statistical models that price properties based on characteristics (square footage, age, condition, location) and then apply adjustments. The models are sophisticated but imperfect.
The result: properties that look similar on paper often end up with meaningfully different appraisal ratios. Newer subdivisions with recent sales tend to be appraised more accurately. Older, more stable neighborhoods with fewer sales are often appraised using older data that may not reflect true market dynamics — pushing ratios up or down unpredictably.
Additionally, when markets move fast in one direction, the mass appraisal model tends to lag — some properties get caught by the model early, others later. This creates windows of significant inequality that the formal protest process exists to correct.
How the Evidence Is Built
The data for an unequal appraisal argument comes almost entirely from the appraisal district's own public records. Every CAD in Texas maintains a searchable database of every property's assessed value, characteristics, and recent sale history. This is public information.
The process works like this:
- Identify 5–10 comparable properties within reasonable proximity — similar square footage, age, condition, and lot characteristics
- Pull the CAD's appraised value for each comparable property
- Find sale prices for those comparables (from public deed records or MLS)
- Calculate each comparable's appraisal ratio (appraised value ÷ sale price)
- Find the median ratio across the comparable set
- Apply that median ratio to your property's market value to calculate the indicated value under Section 42.26
- Present this analysis at the informal hearing or ARB
When the math is solid and the comparables are well-chosen, this argument is difficult for a CAD reviewer to dismiss — they're looking at their own data showing the inequality.
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Who Benefits Most From Unequal Appraisal Arguments
While any homeowner can raise this argument, it tends to be most powerful in specific situations:
Established neighborhoods with mixed sale activity. When some homes in a neighborhood sell frequently and others rarely, the mass appraisal model has inconsistent data to work from. The result is often high variance in appraisal ratios — fertile ground for an inequality argument.
Fast-appreciating markets where the CAD is catching up. In markets where values rose sharply — Austin, Frisco, Flower Mound over the past several years — the CAD often over-corrects in subsequent years, pushing some properties well above their actual ratio. A comparable set of properties that were appraised earlier in the cycle will show lower ratios.
Properties with below-average sales frequency in their area. Homes that haven't sold recently are harder for the mass appraisal model to calibrate. Nearby recent sales may have skewed the model's estimate. A comparable set from the public record often reveals the discrepancy.
Any property in any market. Unequal appraisal exists in every CAD in Texas to some degree. It's a byproduct of mass appraisal. Even in markets where values are accurate in aggregate, individual properties are often outliers — and the law requires correction.
Unequal Appraisal vs. Market Value: Which Wins?
The short answer: whichever produces the lower value. In practice, a strong protest raises both arguments and lets the appraisal district choose which to resolve against. If your market value argument gets you to $490,000 but your unequal appraisal argument gets you to $462,000, the unequal appraisal number prevails — that's what you're entitled to under the law.
This is why the two arguments complement rather than compete. A market value case without an unequal appraisal analysis is leaving potential reductions on the table. And an unequal appraisal case is valuable even in years when you can't find comparable sales that support a lower market value — the argument stands on its own.
The Protest Deadline Is the Hard Constraint
None of this analysis matters if the protest isn't filed on time. The deadline — May 15, 2026, or 30 days from your notice date — is statutory. Once it passes, the value is locked for the year.
You don't need to have a completed unequal appraisal analysis before you file. The protest is filed first; the evidence is developed and presented during the informal hearing process that follows. The critical thing is getting on the docket before the deadline.
If you'd like to understand what your Notice of Appraised Value actually says before deciding whether to file, see our companion article: How to Read Your Texas Notice of Appraised Value →