Texas Property Tax Protest Calculator

How this calculator works

Texas has the third-highest effective property-tax rate in the United States. The combination of no state income tax and aggressive county-level mass appraisal means a typical Texas homeowner pays roughly 1.8% of property value annually in property tax, and combined nominal rates on owner-occupied homestead property frequently land at 2.5% before exemptions. That makes the annual right to protest the appraised value — established by Texas Tax Code Chapter 41 — one of the few owner-side levers available every year.

The calculator scores your protest under the framework Texas appraisal districts and Appraisal Review Boards actually use: a three-tier process (informal staff conference, formal ARB hearing, judicial appeal) with empirically-derived success rates and typical reductions, weighted by the strength of your evidence. The four headline outputs:

1. Protest strength score (0-1). Counts three evidence signals: comparable-sale data, a recent arm's-length purchase, and a reasonable claimed reduction (in the 0-30% band). A protest with all three signals scores 1.0; a bare assertion of overvaluation scores 0.
2. Success probability by path. Each path has an empirical typical success rate (informal ≈ 40%, formal ARB ≈ 30%, judicial ≈ 45%), scaled by your strength score.
3. Expected reduction and tax savings. Typical reduction by path (informal 8%, ARB 10%, judicial 15%) times the success probability, then converted to dollars at your combined tax rate.
4. Filing deadline (Tax Code § 41.44). The LATER of May 15 of the tax year, OR 30 days after the appraisal district mailed your Notice of Appraised Value.

The three-tier protest process under Chapter 41

Tax Code Chapter 41 — Local Review — establishes a structured escalation path. Every Texas appraisal district runs on this framework, with minor procedural variation by county.

Tier 1: Informal staff conference

After you file the notice of protest (Comptroller Form 50-132 or your county's equivalent), the appraisal district will typically schedule an informal conference with a staff appraiser before the formal ARB hearing. The conference is 15-30 minutes — in person, by phone, or via the county's online portal depending on the district. You present comparable-sale data, condition photos, recent purchase price if applicable, and any other evidence you have; the staff appraiser reviews and often makes a settlement offer on the spot.

Empirically, about 35-50% of informal conferences produce some reduction, typically 5-15% of the contested value. Most Texas homeowner protests end here — the informal offer captures most of the realistic upside, and escalating to the formal ARB hearing rarely improves the outcome by enough to justify the additional time and effort.

Tier 2: Formal Appraisal Review Board hearing

If the informal offer is unsatisfactory (or none is made), the protest proceeds to a formal ARB hearing under Tax Code § 41.45. Three ARB members hear evidence from both sides — you and your evidence on one side, the appraisal-district staff representative and the mass-appraisal model on the other — and vote. The hearing is structured but informal; you do not need an attorney, though property-tax consultants and law firms specialize in ARB representation.

Empirically, about 25-40% of formal-hearing protests succeed (a smaller pool because many resolve informally first), with average reductions of 8-12% when granted. The ARB issues a written order within a few weeks of the hearing.

Under Tax Code § 41.43, the owner has the burden of proof to establish the property's value by a preponderance of the evidence. There is a burden-shift mechanic under § 41.43(a) if the appraisal district fails to supply requested information timely — exploit this if the district was slow to respond to your information request.

Tier 3: Judicial appeal (or § 41A binding arbitration)

From an unfavorable ARB order, the owner has two options:

• Judicial appeal under § 41.71. File a petition in district court within 60 days of the ARB order. Review is de novo — the trial court considers the value question fresh, not under a deferential record-review standard, which is unusually favorable to the owner. Practically, judicial appeals are expensive: filing fees, expert appraiser fees of $1,500-$5,000, and attorney fees if not contingency. Most judicial appeals settle before trial — appraisal districts have limited litigation budgets. When a settlement or judgment issues, reductions of 10-25% are common.
• Binding arbitration under § 41A. For residential properties at or below $5,000,000, an alternative to judicial appeal. Arbitrators are appointed from a Comptroller-maintained roster; decisions are final. Cheaper than litigation (single arbitration deposit of $400-$1,550 depending on property value) but with no appellate path. The 60-day window from the ARB order applies.

Evidence is what wins protests

The strength score the calculator computes is a proxy for what staff appraisers and ARBs actually weight. Three signals:

Comparable sales (1 point). Three to five comparable nearby properties, with arm's-length sale prices within the past 12-18 months, adjusted per square foot for size, age, condition, and any major features (pool, view, recent renovations). Per-square-foot normalization is the standard adjustment method. If you have no comps, this point is zero.

Recent purchase price (1 point). If you bought the property within the past 1-2 years at an arm's-length transaction, that price is near-dispositive evidence of market value at the time of sale. Bring the HUD-1 / Closing Disclosure to the hearing. Gift, inheritance, foreclosure deed-in-lieu, family transfer, or distress sale does not count — only arm's-length open-market purchases.

Reasonable claimed reduction (1 point). Your claim must be in the 0-30% band. Claims of 5-15% reductions are routinely granted on adequate evidence; claims of 20-30% are granted when the evidence is strong; claims above 30% are routinely rejected absent extraordinary evidence (catastrophic damage, comparable-sale data well below the contested figure). The calculator flags out-of-band claims and zeroes this signal.

The success-probability formula is path's typical success rate × (0.5 + strengthScore × 0.5). The 0.5 floor reflects empirical reality: even a zero-evidence protest produces some outcome variability — appraisal-district staff occasionally grant small reductions to clear the docket. A fully-evidenced protest (strength 1.0) gets the path's typical headline rate; a zero-evidence protest gets half of it.

Worked example A — informal conference with comparable sales

A Texas homeowner receives a NOAV showing $500,000 appraised value for the 2026 tax year. The owner believes the property is actually worth about $450,000 (a 10% claimed reduction) and has assembled three comparable nearby sales averaging $455,000. No recent purchase. The owner plans to file an informal protest.

The calculator returns:

• Protest strength score: 0.67 (comparable sales: yes; recent purchase: no; reasonable claim: yes)
• Success probability: ≈ 33% (informal typical 40% × strength multiplier 0.83)
• Expected reduction: ≈ 2.7% of appraised value — about $13,333
• Reduced appraised value: ≈ $486,667
• Annual tax savings: ≈ $333 (at a 2.5% combined rate)
• Filing deadline: May 15, 2026 (NOAV mailed April 1; May 15 controls because it is later than NOAV+30 = May 1)

The strategic read: this is a routine informal protest with adequate but not overwhelming evidence. The expected reduction is modest because the owner's only evidence is comparable-sale data — strong but not dispositive. If the staff appraiser offers the full $13K reduction (or more), take it. If the offer is materially below your claim, the next move is escalating to the formal ARB hearing — but the formal-tier success rate is lower (≈ 30%), so the escalation gamble only pays off if your evidence is meaningfully stronger than what the staff appraiser already saw.

Worked example B — informal conference with a recent purchase

Same property, same $500K appraised, but the owner bought the property six months ago at $445,000 in an arm's-length open-market transaction, and has comparable-sale data confirming the $445K figure. The claimed reduction is now 11%.

The calculator returns:

• Protest strength score: 1.0 (all three signals present)
• Success probability: 40% (full informal typical rate, no strength penalty)
• Expected reduction: 3.2% — $16,000
• Reduced appraised value: $484,000
• Annual tax savings: $400

The recent purchase price is near-dispositive at the informal tier. Appraisal-district staff will rarely contest a recent arm's-length purchase price — bringing the HUD-1 / Closing Disclosure to the conference typically produces an immediate settlement. The expected reduction here is on the lower end because the typical informal reduction is 8% (the calculator uses empirical averages, not best-case scenarios). In practice, an owner with a recent-purchase claim at 11% often realizes a reduction closer to the full claimed amount.

Worked example C — formal ARB hearing with weak evidence

Same $500K appraised, $450K argued (10% claim), but the owner has no comparable sales and no recent purchase — just the gut sense that the appraisal is too high. The owner escalates to the formal ARB hearing.

The calculator returns:

• Protest strength score: 0.33 (only the reasonable-claim signal)
• Success probability: 20% (ARB typical 30% × strength multiplier 0.67)
• Expected reduction: 2.0% — $10,000
• Reduced appraised value: $490,000
• Annual tax savings: $250

The weak-evidence formal-hearing path produces a modest expected outcome. The ARB will hear the protest, the owner will make the case, and the panel will weigh the owner's testimony against the appraisal district's mass-appraisal model — without comparable-sale data on the owner's side, the model almost always carries the day. The lesson: do not escalate to the formal hearing without assembling at least one substantive evidence pillar (comps or a recent purchase). The expected outcome of a weak-evidence ARB protest is barely different from accepting the appraised value as filed.

Worked example D — judicial appeal with a very high claim

A Texas commercial property owner receives a NOAV showing $800,000 appraised value and believes the property is worth $500,000 (a 37.5% claimed reduction). The owner has strong comparable-sale data ($600K average) and a recent purchase price of $550K — but the 37.5% claim is outside the reasonable 0-30% band, so the calculator treats this as a strength penalty.

After exhausting the informal and ARB paths, the owner files a judicial appeal under § 41.71.

The calculator returns:

• Protest strength score: 0.67 (comps + recent purchase, but the claim is out of band, so reasonable-claim=0)
• Success probability: 37.5% (judicial typical 45% × strength multiplier 0.83)
• Expected reduction: 5.6% — $45,000
• Reduced appraised value: $755,000
• Annual tax savings: $1,125

The strategic read: the owner's claimed reduction is too aggressive for the band. Either the property is genuinely worth significantly less than $500K (in which case the evidence should reflect that — get a formal appraisal, not just comps), or the claim should be narrowed to the 20-25% range where the evidence will actually carry. Judicial appeals on out-of-band claims often settle around 10-20% reductions even when the trial court would not have gone that far — appraisal districts negotiate to clear the docket. Expert appraiser fees of $1,500-$5,000 and attorney fees compress the net benefit, so judicial appeals only make economic sense for high-value properties or principle disputes.

Equity-and-uniformity under § 41.43(b)(3)

A distinct and often-underused protest ground: even if the appraisal is at market value, you may prevail by showing that comparable properties on the appraisal roll are valued lower per square foot or per acre than your property. Tax Code § 41.43(b)(3) requires the owner to show the appraised value of the subject property exceeds the median appraised value of a representative sample of comparable properties, after appropriate adjustments.

The ground is especially powerful in jurisdictions with inconsistent mass-appraisal models or where adjacent neighborhoods are appraised under different methodologies. To pursue the claim:

1. Pull the appraised values of five to ten comparable properties from the appraisal district website.
2. Normalize each to a per-square-foot or per-acre figure.
3. Compute the median.
4. If your per-square-foot appraised value exceeds the comparable median by more than ≈ 10%, you have a viable § 41.43(b)(3) claim.

Equity-and-uniformity arguments are often more persuasive at the ARB than pure value arguments, because they expose a defect in the district's own mass-appraisal model rather than asking the ARB to second-guess the model's output.

Property-tax-protest service companies

Texas has a robust ecosystem of tax-protest service companies that file protests on behalf of owners on a contingency-fee basis. Typical fees: 25-50% of first-year tax savings, sometimes plus a flat "sign-up" fee. Larger firms — O'Connor & Associates, Five Stone Tax Advisers, Texas Protax, ProTax Consultants — handle thousands of properties annually and automate the protest filing, evidence assembly, and informal-conference negotiation.

The economics work for owners with a meaningful contested value (≈ $400K+ appraised, where a 5-10% reduction times the take-rate translates to several hundred dollars net to the owner). At lower values the contingency take and any sign-up fee compress the net benefit close to zero.

Two cautions: (1) Some firms file every account they sign on a near-template basis with minimal evidence, which produces below-average outcomes. Ask about the firm's protest-by-protest evidence workup process. (2) Read the contract — some firms auto-renew the contingency engagement annually and charge a flat sign-up fee even when no reduction is achieved.

For a self-represented owner with comparable-sale data and a recent purchase price, the DIY informal-conference path typically produces 70-90% of the reduction a service company would have achieved — at zero fee.

Common mistakes

The empirical pattern across appraisal-district outcomes:

• Missing the May 15 / NOAV+30 deadline. Forfeits the protest for the tax year. There is no informal cure mechanism.
• Vague claims without comparables. "My neighbor pays less" is not evidence; "my neighbor's appraised value per square foot is 18% lower than mine, here are the appraisal-district screenshots" is.
• Claims above 30%. Routinely rejected absent extraordinary evidence. Narrow the claim to the band where the evidence actually carries.
• Filing only an emotional protest. "The appraiser was rude" or "the notice was confusing" is not a Tax Code § 41.41 ground. Map your protest to one of the statutory grounds.
• Skipping the informal conference. Most protests resolve there, faster and with less effort than the formal ARB hearing.

What this calculator does not do

This is a planning tool. It does not:

• Replace a licensed Texas property-tax consultant, attorney, or CPA. The protest process involves substantive judgment — which evidence to lead with, when to settle informally, when to escalate. Consult a qualified Texas professional for your specific case.
• Forecast county-by-county variation. Empirical success rates and typical reductions vary across the 254 Texas appraisal districts; the figures here are pooled medians from major-county data and should be treated as estimates.
• Compute the binding-arbitration ($400-$1,550 deposit) vs judicial-appeal (filing fees + expert appraiser + attorney) cost comparison. Each owner's situation differs; the appropriate path is a function of the contested dollar value, available evidence, and the owner's risk tolerance.
• Account for special-purpose property categories (agricultural-use appraisal under Chapter 23, special-use timber appraisal, dealer's heavy equipment inventory under Chapter 23) that have their own protest mechanics.

How this page is maintained

The substantive framework (Tax Code Chapter 41 — § 41.41 through § 41.71, plus § 41A binding arbitration) has been stable for years. Legislative refinements typically tweak procedural details (electronic filing, hearing format, ARB training) rather than the underlying tiered structure. We monitor each Texas legislative session and any Texas Supreme Court property-tax opinion that materially shifts the framework, and refresh this page within the quarter after any statutory change.

Tools, not advice. The calculator's empirical success rates and typical reductions are pooled estimates — your individual outcome will vary with county, evidence quality, and the specific ARB or staff appraiser assigned. Consult a licensed Texas property-tax professional, CPA, or attorney before acting on any specific protest decision.

Last reviewed: 2026-05-16 against Texas Tax Code Chapter 41 — § 41.41, § 41.43, § 41.44, § 41.45, § 41.71; Tax Code § 41A; Texas Comptroller property-tax assistance.