Own Luxury Homes®
Property Tax Appeal Evidence: What Actually Wins
91.8% of TX winners used comparable sales (Comptroller). Evidence-based appeals: 60–90% win rate; no documentation: only 12%. Gold standard: 3–5 comparable sales, 6–12 months, same area, similar size. Zestimates/AVMs: REJECTED by all review boards — use documented actual sales. Clerical errors: 15–20% of wins; often corrected without formal hearing. Condition: dated photos + written licensed contractor estimates. Uniformity: your assessment ratio vs neighbors’ ratios. 5-doc package wins most hearings. Own Luxury Homes® 12-Point Agent Integrity Audit™ — CMA data for tax appeals.
Property Tax Appeal Evidence: What Actually Wins in 2026 — and What Gets Thrown Out
The difference between a property tax appeal that wins and one that gets dismissed in 10 minutes is almost entirely the quality and organization of your evidence. Review boards see hundreds of appeals. They award reductions to homeowners who show up with data. They dismiss appeals from homeowners who show up with complaints. This guide tells you exactly what evidence wins, how to find it, how to format it, and what to leave out of your appeal package.
Evidence Type 1: Comparable Sales (The Gold Standard)
What Qualifies as a Comparable and How to Find It
A "comparable" (or "comp") is a property similar enough to yours that a review board will accept its sale price as evidence of your property’s market value. What makes a good comp: Location: same neighborhood, subdivision, or ZIP code preferred; within ½ to 1 mile maximum in most cases. Size: within 10–15% of your square footage. Type: same property type (single-family, condo, townhome). Recency: sold within the last 6–12 months (boards give more weight to more recent sales). Condition: similar condition to your property (adjust mentally for obvious differences). Age: ideally within 10–15 years of your home’s age. Where to find comp data: County assessor website: most counties publish recent sales online. Zillow and Redfin "Sold" filter: filter by sold date, neighborhood, and home size; verify each sale against county records before using. Real estate agent: a local agent can pull precise MLS data in minutes including exact sale price, sale date, condition at sale, and any concessions — the same data used for listing CMAs is exactly what wins appeals. The OLH connection: a CMA from a licensed agent for your property is one of the most powerful appeal packages you can bring. It shows you used professional data sources and followed the same methodology the assessor is supposed to use.
Evidence Type 2: Property Condition Documentation
How to Document Condition Issues That Reduce Value
Mass appraisals assume average condition for a home of your age and type. If your home has specific issues that would cause a buyer to pay less: document them systematically. What counts as condition evidence: Photographs: dated, high-resolution photos of specific defects (roof deterioration, foundation cracking, water damage, deferred exterior maintenance). Contractor estimates: written estimates from licensed contractors stating the issue and the cost to remedy. These are typically accepted as professional documentation. Home inspection reports: if you had a recent inspection that documented deficiencies: include the relevant sections. Repair history: if you’ve documented attempting repairs that were unsuccessful or incomplete: include invoices. What does NOT count: general statements that the home "needs work." Subjective opinions without documentation. Estimates from unlicensed contractors. The calculation: if your board accepts your condition evidence, they typically reduce the assessed value by the documented repair cost or a portion of it. A $20,000 roof replacement estimate might produce a $15,000–20,000 reduction in assessed value, saving you $150–$300/year depending on your tax rate.
Evidence Type 3: Assessment Errors (The Easiest Win)
Clerical and Data Errors That Require Immediate Correction
This is the fastest path to a reduction. 15–20% of successful appeals nationally stem from factual errors. Common errors in Property Record Cards: Wrong square footage: if the county has your home at 2,500 sqft and it’s actually 2,200 sqft: a correction is legally required. Wrong bedroom or bathroom count: if the county lists 4 beds and you have 3: document and correct. Non-existent improvements: if the county is taxing you for a pool, garage, or addition that does not exist: photograph and document the absence. Finished vs unfinished spaces: if your basement is unfinished but recorded as finished: photos and correction produce an immediate adjustment. Land area errors: if your lot size is wrong: survey documents correct this. Double assessment: rare but documented — property appearing twice in the tax roll. Documentation for error corrections: your home’s original blueprints or building permit; your closing disclosure or appraisal from purchase; a licensed appraiser’s floor plan; for pool/improvement absence: dated photographs. Most counties will correct documented factual errors without requiring a formal appeal — report them directly to the assessor’s office first.
Evidence Type 4: Uniformity (Unequal Assessment)
Proving You’re Assessed Higher Than Your Neighbors
Even if your assessed value is close to market value, you can appeal on uniformity grounds if similar properties in your area are assessed at a lower percentage of their market value. The argument: "My home is assessed at 95% of its market value. These five comparable properties sold within the last year and were assessed at 78–85% of their sale prices. I am carrying a disproportionate tax burden." How to calculate uniformity: take each comparable sale; divide the assessed value by the sale price to get the assessment ratio; average the ratios for your comparables; compare to your own ratio. If your ratio is significantly higher: this is a valid uniformity appeal in most states. States that explicitly allow uniformity appeals: Texas, Illinois, New York, New Jersey, Pennsylvania, and most states with formal assessment equity standards. The key: present the uniformity argument in table format with each comparable’s address, assessed value, sale price, and ratio.
What Evidence Gets Rejected: Common Mistakes
| What You Might Bring | Whether It Works | What to Use Instead | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Zillow Zestimate or Redfin estimate | ❌ Rejected — AVMs not accepted by any board | Actual documented sales transactions from county records or MLS | |||||||
| "I think my taxes are too high" | ❌ Dismissed immediately | Specific dollar difference between assessed value and documented market value | |||||||
| Comps from a different ZIP code or city | ⚠️ Risky — may be rejected if not sufficiently similar | Prioritize same subdivision/neighborhood; explain why broader area was necessary if unavoidable | |||||||
| Sales from 2+ years ago | ⚠️ Weak evidence — boards prefer last 12 months | Focus on 6–12 month sales; note market direction if older sales support your case | |||||||
| Contractor verbal estimate | ❌ Not accepted — must be in writing | Written, signed estimate on contractor letterhead from licensed contractor | |||||||
| Neighbor’s tax bill (not sale price) | ❌ Not direct evidence of market value | Neighbor’s sale price + assessed value to calculate their ratio for uniformity argument | |||||||
| General claim of "market decline" | ⚠️ Too vague — needs specific documentation | Specific comparable sales showing lower values in your market segment | |||||||
| One additional note: never mention what you paid for the home if it was significantly above market value. Your purchase price is not evidence of current market value unless it was a recent arm's-length transaction. | |||||||||
The Winning Evidence Package: What to Bring to Your Hearing
The 5-Document Package That Wins Most Appeals
Document 1: Your current assessment notice (shows what you’re appealing and the amount). Document 2: Your Property Record Card (shows what the county has on file; highlight any errors). Document 3: Comparable sales analysis (3–5 comps in a clean table: address, sale date, sale price, sqft, beds/baths, $/sqft, and the adjustments you’re making for differences). Document 4: Condition documentation if applicable (photos + contractor estimates for specific defects). Document 5: Your proposed value (a clear statement: "Based on the evidence presented, the market value of my property is $X, not the assessed value of $Y. I am requesting an adjustment to $X."). Presentation tips: Print 3 copies (one for you, one for the board, one for the assessor). Use a simple table format for comps — not a wall of text. Be prepared to explain each comparable briefly. Stay factual. Do not argue about tax rates or the fairness of the system. The only argument the board can act on is the market value of your specific property.
“The evidence I pull for homeowners preparing tax appeals: "I’m going to give you exactly what I give buyers when we’re writing an offer on your property. The last three comparable sales within a quarter mile: addresses, dates, prices, and $/sqft. The same data that tells us your home is worth $445,000 tells the review board it’s worth $445,000 and shouldn’t be assessed at $480,000. That’s the entire argument in one table. The appeal board is going to look at those comps and do exactly the same math I did. They’re not going to dispute that three homes sold for $441,000, $453,000, and $460,000. That’s public record. They’re going to ask: "What’s different about this home vs those comps?" Have your answer ready. If your home is in better condition: they might not reduce as much. If it’s in worse condition: bring your contractor estimates. But the comps are the case. The rest is just explaining the adjustments."”
— Ryan Brown, Principal Broker & CEO, Own Luxury Homes®
What evidence do I need for a property tax appeal?
The three types that win: (1) Comparable sales — 3–5 recent sales (6–12 months) of similar properties showing lower market value than your assessment; must be actual documented transactions, not Zestimates or AVMs. (2) Property condition documentation — dated photos + written contractor estimates for defects reducing market value. (3) Assessment errors — documented discrepancies in your Property Record Card (wrong square footage, bedroom count, improvements). Present in a clean, organized package: table format for comps, highlighted errors on the Record Card, photos with dates for condition issues. 91.8% of Texas winners used comparable sales as primary evidence.
Own Luxury Homes® — CMA data that powers property tax appeal evidence packages. 12-Point Agent Integrity Audit™. Get comparable sales data from a verified specialist ›
"The introduction Own Luxury Homes® makes is to a specialist with documented closing history in your specific market — not the county, not the metro, the submarket you're actually selling or buying in. That's the standard we verify before your name goes anywhere."
— Ryan Brown, Principal Broker & CEO, Own Luxury Homes® (FL License BK3626873)