Texas Property Tax Appeal Deadline May 15, 2026: Last 2 Weeks to Protest Your 2025 Assessment
If you own property in Texas and your 2025 assessed value looks too high, you have until May 15, 2026 to file a formal protest with your county appraisal district. After that date, the 2025 number is locked — and the next opportunity to challenge it is in 2027. Here is exactly what to do, with what evidence, and what happens if you miss the window.
Why the May 15 deadline is firm
Texas Property Tax Code §41.44 sets the deadline to file a formal protest at May 15 of the tax year, or 30 days after the date the appraisal district mails the notice of appraised value — whichever is later. For most homeowners, the May 15 cut-off is the binding date because notices are typically sent out in April.
The Texas system is unforgiving on this point. Unlike federal tax filings, where extensions and late submissions are common, the property tax protest deadline is a true forfeit. Miss it and the appraisal district has no administrative authority to reopen the case. The only avenues left are limited (court appeals based on procedural error, which require a lawyer) and rarely worth the legal fees.
Of property tax protests in Texas result in a reduction, according to NTU Foundation aggregated data. Average successful reductions in fast-growth Texas markets run 8–20% of the contested value.
The 4-step appeal process in Texas
Step 1: Confirm your appraisal notice was received and check the value
Your county appraisal district (CAD) — Harris, Travis, Dallas, Bexar, Tarrant, Collin, Williamson, Fort Bend, Denton, etc. — mails a Notice of Appraised Value typically in April. The notice shows the proposed market value, taxable value, and any exemptions applied. Check three things immediately:
- Is the address correct? Mass appraisal errors do happen — wrong square footage, wrong number of bathrooms, wrong year built, wrong neighborhood code.
- Are your exemptions applied? Homestead, over-65, disability, veteran, agricultural — every exemption you qualify for must be visible on the notice. If an exemption you previously applied is missing, that alone is grounds to protest.
- Is the value reasonable? Compare against recent sales of similar nearby homes. Texas appraisal models can lag actual market trends by 3–6 months and miss neighborhood-specific corrections.
Step 2: File your Notice of Protest (Form 50-132)
Every CAD accepts the formal protest using Texas Comptroller Form 50-132 (Notice of Protest), but most counties also accept online filing through their own portal. The protest must be filed by the deadline (May 15 or 30 days after the notice was mailed). Filing options:
- Online: Most large CADs (HCAD for Harris, TAD for Tarrant, DCAD for Dallas, TCAD for Travis, BCAD for Bexar) have online protest portals that confirm receipt instantly.
- Mail: Postmark by May 15 is sufficient. Use certified mail with return receipt.
- In person: Drop off at the CAD office. Get a date-stamped receipt.
- Through a property tax consultant or law firm: The firm files on your behalf; you sign an authorization (Form 50-162).
You don't need to provide all your evidence at the time of filing. Most counties accept the bare-minimum protest with reasons ("market value is too high" and "value is unequal compared to other properties") checked, and let you build your evidence package before the hearing.
Step 3: Build your evidence file
The strength of your protest lives or dies on evidence. The four most persuasive types in Texas:
- Comparable sales (comps): Recent sales of similar homes in your neighborhood, ideally within 6 months and within a tight value range. Pull from county records, MLS reports through a realtor friend, or your CAD's own data tools.
- Equity comparables (unequal appraisal): Other similar properties in your CAD assessed at lower values. This is a uniquely Texas-friendly argument and often wins reductions even when comp sales are weak.
- Property condition issues: Photos, inspection reports, contractor estimates for major repairs (roof, foundation, HVAC). Document any condition that lowers market value.
- Independent appraisal: A licensed appraiser's report typically costs $400–$700 but carries serious weight at the ARB hearing.
Step 4: The Appraisal Review Board (ARB) hearing
If informal negotiation with the CAD doesn't resolve your protest, your case goes to the Appraisal Review Board — a panel of citizen volunteers who hear protests. Most ARB hearings last 15–20 minutes per case. You present your evidence; the appraisal district staff presents theirs; the ARB makes a binding decision.
Many cases settle at the informal stage before reaching the ARB — the appraisal district staff often offers a reduction to clear the docket. If you accept the offer, you sign a settlement and the case closes. If you reject, you go to the ARB.
What happens if you miss May 15
Your 2025 assessment becomes final. You will pay your 2025 property tax bill on that locked value, period. Texas law gives no administrative remedy for late protests — the appraisal district cannot reopen the case voluntarily, and the courts will only intervene in narrow cases (clear error of law, fraud, or denial of due process).
The next chance to challenge: when the 2026 Notice of Appraised Value arrives (typically April 2026), with a deadline around May 15, 2027. For a homeowner over-assessed by 10% on a $400,000 property in a 2.5% rate Texas county, missing the 2025 deadline costs roughly $1,000 in unnecessary tax for that single year. Multiply that by the years of compounded over-assessment if the issue isn't corrected and the dollar amounts stack quickly.
Top Texas counties: where over-assessment is most common
Mass appraisal models perform worst in markets with rapid price changes — meaning the fastest-growing Texas counties tend to have the highest rates of over-assessment. The metropolitan counties below produced the highest volume of successful protests in recent years:
DIY protest vs licensed property tax consultant
You have three realistic paths once you've decided to protest:
Option 1: DIY (free)
Best for confident homeowners with strong evidence (recent sale, obvious comp gap, unfair condition). The CAD portals have improved a lot — Harris, Travis, Dallas, Bexar, and Collin all support fully online protests with evidence upload and informal settlement offers without leaving the browser. Time investment: 4–8 hours total over 2–3 weeks.
Option 2: Property tax consultant on contingency
The firm handles the full protest end-to-end. They charge a percentage of the first year's tax savings (typically 25–50%), and only get paid if they reduce your bill. No win, no fee. Best for people who don't want to manage the process, or have higher-value properties where a 10% reduction matters in real dollars.
Option 3: Full-service appeal company (Ownwell and similar)
Same contingency model as a traditional consultant, but with a tech-enabled platform that automates evidence gathering, integrates directly with CAD systems, and tracks the case status online. Faster initial review, transparent pricing, scaled to handle large volumes during the protest season.
Two weeks left. Free 60-second review.
Ownwell handles the full protest on contingency — you only pay if your bill drops. Texas-licensed, no win no fee, average homeowner saves $1,148/year.
Start your free Ownwell review →Quick action checklist for the next 14 days
- Today: Locate your 2025 Notice of Appraised Value. Confirm the value, exemptions, and property characteristics on it.
- This week: Pull 3–5 comparable sales from your neighborhood (any realtor will do this for you for free, hoping for future business).
- This week: Decide DIY vs licensed consultant. If consulting, sign authorization (Form 50-162) early so the firm has time to file.
- By May 14: File the Notice of Protest (Form 50-132) online or by mail. Don't wait until May 15 — system overloads happen.
- After filing: Build your evidence package. Most CADs offer informal settlements before the ARB hearing — take a reasonable offer when it comes.
Bottom line
The Texas property tax protest is one of the highest-leverage administrative actions a homeowner can take in any given year. Half the people who file get a reduction. The deadline is real, the process is well-defined, and the cost (zero out-of-pocket if using a contingency firm) is low. The single largest predictor of success is filing on time. After May 15, 2026, the door closes for the 2025 tax year.