The right evidence for a property tax protest can move your tax appraised value down, and a few specific documents do most of the heavy lifting.
- Closed comparable sales from the 12 months before January 1 are the single most persuasive piece of evidence in most residential cases.
- Written contractor repair estimates for real condition problems show a value the county’s mass appraisal model never saw.
- Market changes and unequal appraisal give you two independent arguments, and a strong file can lean on both.
- Record errors and exemption questions are handled directly with your appraisal district, not through a protest.
Gather the right proof before the deadline, because the appraisal district will not lower your number on its own.
When your Notice of Appraised Value lands in the mailbox each spring, the figure printed on it is a starting point, not a verdict. The county sets it with a mass appraisal model that values thousands of homes at once, so it rarely reflects the condition or recent sales history of your specific property. That gap is where the right evidence for a property tax protest earns its keep. The strongest cases rest on a short list of concrete items, and Texas A&M’s Texas Real Estate Research Center points out that only closed sales, not asking prices, qualify as valid comparables at a hearing. If you want a plain-English overview first, property tax help for Texas homeowners is a good place to start.
What Counts as Evidence for a Property Tax Protest?
Evidence for a property tax protest is any credible, objective information showing that your home’s tax appraised value is higher than what your property is worth. A protest challenges that value and nothing else, so keep your file focused on value. The Texas Comptroller notes that the appraisal review board (ARB) bases its decision on the facts you and the district present, and that the district carries the burden of proving its number is correct.
One timing rule shapes everything. Texas law appraises property as of January 1 of the tax year, so your evidence has to describe your home as it stood on that date. A repair estimate or a comparable sale needs to match that as-of date, and changes after January 1 will not help this year’s case. It also helps to understand tax appraised value versus market value, since that distinction is the heart of most residential protests.
Which Comparable Sales Actually Lower Your Tax Appraised Value?
Comparable sales are the backbone of most protests, and they are the clearest evidence to lower appraisal value a homeowner can bring. The idea is simple: if homes genuinely similar to yours sold for less than your tax appraised value in the year before January 1, your number is likely too high. The execution is where cases are won or lost, because raw sale prices rarely tell the full story.
Texas is a non-disclosure state, so closed sale prices are not published in public records. That makes reliable data harder to come by and rules out estimates from general real estate websites, which appraisal review boards do not treat as credible. Always work from actual closed sales, not homes currently listed. Active or pending listings are not evidence, because a home that has not closed has not established a real price.
Then come the adjustments. Appraisal districts weigh more than 40 characteristics when valuing a home, and each one gets adjusted up or down. If a nearby home sold for less but has fewer bedrooms, a smaller lot, or no garage, you have to account for those differences before the comparison means anything. This is why comparing your value to a neighbor’s without proper adjustments can backfire. Strong property tax protest evidence uses adjusted comps, and a short, well-built set beats a long pile of loose lookalikes.
How Do Condition Issues and Repair Estimates Strengthen Your Case?
Mass appraisal models assume your home is in average condition for its neighborhood. When it is not, documented condition problems become some of the most useful appraisal appeal evidence in Texas you can present. A cracked foundation or an aging roof reduce what a buyer would pay, yet the county’s model cannot see them unless you show it.
You show it through written repair estimates from licensed contractors. An estimate that puts a real dollar figure on a needed roof replacement or foundation repair turns a vague complaint into a concrete number the board can partially subtract. Because your value is set as of January 1, the condition you document has to have existed before that date. Keep recent closing documents handy too, since a purchase price can be strong evidence of what your home is worth.
One clarification on what does not belong here. Interior upgrades like a remodeled kitchen do not lower your tax appraised value but will actually increase it, so their absence is not a point in your favor. And a repair you made after January 1 describes a different home than the one being valued. Focus your condition evidence on real, pre-January 1 problems backed by a written contractor estimate. See how these pieces fit together in our walkthrough of the full protest evidence and hearing process.
Can Market Changes and Unequal Appraisal Help?
Market movement is real evidence when it shows up in closed sales. If your local market softened in the year before January 1, the closings from that window reflect it, and those sold homes become your proof. Appraisal districts often lean on older data and can be slow to reflect a cooling market, so a flat or even slightly lower number can still sit above what the market now supports.
You also have a second, independent argument called unequal appraisal. Here the question is not what your home would sell for, but whether similar properties are being appraised at a lower level than yours. If comparable homes in your neighborhood carry lower tax appraised values after proper adjustments, that inequity is grounds for relief on its own. Building it correctly still takes the same adjustment discipline as a sales case. The strongest files often present both angles, and our notes on common appraisal mistakes to avoid can keep either from falling apart on a technicality.
What Evidence for a Property Tax Protest Belongs in Your File?
A clean file is easy to build once you know which items actually support a lower tax appraised value. Here is the evidence to lower appraisal value that belongs in a residential protest:
- Closed comparable sales from the 12 months before January 1, properly adjusted for differences from your home
- Written repair estimates from licensed contractors for condition problems that existed before January 1
- Recent closing documents or a purchase price that reflect what you paid
- Adjusted values of similar neighborhood properties to support an unequal-appraisal argument
Just as important is knowing what is not protest evidence, because a few common items are handled somewhere else entirely:
- Record errors such as wrong square footage, an incorrect bedroom count, or a mislabeled feature are corrected directly with the appraisal district rather than through a protest
- Exemption questions, including a homestead application or a five-year homestead verification request under SB 1801, go directly to the CAD and are separate from the value protest. Respond promptly to any verification letter so your exemption stays active.
- Your current tax bill and any change in local tax rates, which are set by taxing entities and cannot be protested
Routing those items correctly matters. Fixing an error or applying an exemption with the CAD does not lower your value at a hearing, but it makes sure next spring’s protest argues against accurate baseline data. Before you file, review your appraisal notice carefully to see which lane each issue belongs in, and confirm you are inside the protest filing deadline of May 15 or 30 days after your notice is mailed, whichever is later.
Does Strong Evidence Guarantee a Lower Tax Bill?
Strong evidence gives you the best shot at a fair value, but it is worth being honest about how a reduction flows through to your bill. For most homeowners, a reduction in tax appraised value flows directly into a lower tax bill, because their taxable value tracks their tax appraised value closely. That is the common case.
There is a narrower group where the math works differently. For long-tenured homestead owners whose tax appraised value has climbed faster than the 10% homestead cap allows, the cap may already hold taxable value below the tax appraised value. There, a reduction lowers the baseline without necessarily changing the current year’s bill, but it is still valuable, because every future year’s cap is calculated from that lower starting point. You can see exactly how the 10% homestead cap works in our guide. This is why annual protesting is worthwhile no matter what your notice says, since keeping your baseline low compounds over time.
One honest note about outcomes: no company can legally promise or guarantee a specific reduction, and any firm that quotes you a savings figure before reviewing your property is a red flag. The only way to know whether your value is fair is to take it through the full process. That is where licensed, local property tax professionals earn their place. They know which adjusted comps a specific appraisal district finds credible and can carry a case from the informal meeting through a formal ARB hearing.
Because the whole process runs online, working with licensed professionals does not require a single in-person meeting. A model with a modest upfront fee plus a share of savings tends to be the best value, because it commits a professional to fully protest every property every year rather than cherry-picking only the cases that look easy to bill. Our overview of the best way to protest lays out the tradeoffs.
Frequently Asked Questions
A few questions come up again and again once homeowners start gathering materials.
Is a purchase price good evidence for a property tax protest?
Yes, a recent closing can be strong evidence, especially if you paid less than your tax appraised value. Your settlement statement documents an actual arm’s-length transaction, which is exactly the kind of real closed-sale data appraisal review boards respect. Keep it with your file and pair it with adjusted neighborhood comps for a fuller picture.
Can I use online home value estimates as appraisal appeal evidence in Texas?
Automated estimates from consumer real estate sites are not accepted as appraisal appeal evidence in Texas, because Texas is a non-disclosure state and those figures are not verified closed prices. Appraisal review boards want actual sold-home data with proper adjustments. Reliable, adjusted comparable sales are the substitute that holds up.
What if the appraisal district has the wrong square footage for my home?
A factual record error is corrected directly with the appraisal district, not through a protest. Contact your CAD to fix the square footage, bedroom count, or any other characteristic that is wrong. Once the record is accurate, that clean data supports a stronger property tax protest evidence package the following year.
Do the new homestead exemptions change what evidence I need?
No. The exemption and the protest are separate levers. Voters raised the school district homestead exemption to $140,000 retroactive to January 1, 2025, which lowers your taxable value, while your protest still challenges the tax appraised value itself. You gather the same comps and estimates regardless, and the two savings stack.
Ready to Put Your Evidence to Work?
The value on your notice is only as accurate as the data behind it, and the appraisal district will not reduce it for you. Gathering adjusted closed sales, documenting real condition issues, and filing on time is how you make the case for a fair number, year after year. If you would rather hand that work to a team that does it every day, our licensed professionals at Home Tax Shield review every property with real market data and human judgment, working entirely online through the full process. Contact us to get started and let our team build the evidence for you, and explore more strategies to lower your property taxes along the way.