Rob Hartley

Founder, AppealDesk · February 28, 2026

Is My Property Over-Assessed? 5 Signs You're Overpaying

Updated March 2026

Every year, 60% of properties are over-assessed. That's not our opinion — it's from the National Taxpayers Union. Yet only 2% of homeowners appeal.

Here are the five clearest signs you're in that 60% and what to do about it.

Sign #1: Your Assessment Jumped More Than 10% in One Year

The Red Flag: Your assessed value increased by more than 10% from last year without major improvements.

Why It Happens: Counties often apply blanket percentage increases to entire neighborhoods. They assume if some houses sold for more, all houses are worth more. This lazy math ignores individual property differences.

Real Example: In Dallas County, entire subdivisions saw 15-20% increases in 2025 when only a handful of renovated homes actually sold. The non-renovated homes got swept up in the increase.

What to Do: Check your assessment history. If you see a sudden spike without adding a pool or major renovation, you're likely over-assessed. [Use our calculator to see what similar homes actually sold for →]

Sign #2: Your Neighbors Pay Significantly Less for Similar Homes

The Red Flag: Houses on your street with the same builder, square footage, and features are assessed 15%+ lower than yours.

Why It Happens:

• Some neighbors appeal regularly (and win)
• Assessment errors compound over time
• Counties miss previous reductions when applying new rates

How to Check: Most counties have online property search tools. Look up 3-4 neighbors with similar homes. Compare:

• Assessed values
• Square footage
• Year built
• Property features

If you're paying $2,000+ more per year than identical houses, you're over-assessed.

Quick Test: [Enter your address here] to instantly see what neighbors pay.

Sign #3: Recent Sales in Your Area Are Lower Than Your Assessment

The Red Flag: Homes similar to yours sold for less than your assessed value in the past 12 months.

The Math: If your home is assessed at $400,000 but similar homes sold for:

• 123 Oak Street: $365,000 (3 months ago)
• 456 Elm Avenue: $378,000 (5 months ago)
• 789 Maple Drive: $370,000 (6 months ago)

Average sale price: $371,000 Your assessment: $400,000 You're over-assessed by $29,000 (7.8%)

Critical Detail: Compare only truly similar homes:

• Within 0.5 miles
• ±20% of your square footage
• Same number of bedrooms/bathrooms
• Similar age (±10 years)

This is the #1 way to prove over-assessment, and it's exactly what appraisal boards look for.

Sign #4: Your Assessment-to-Market Value Ratio Exceeds Your Area's Median

The Red Flag: Your home is assessed at a higher percentage of market value than other properties in your area.

Understanding Ratios:

• Your assessment ÷ Market value = Your ratio
• If homes typically assess at 85% of market value but yours is at 95%, you're over-assessed

Example:

• Neighborhood median ratio: 0.85 (85%)
• Your ratio: 0.95 (95%)
• You're paying 11.7% more than you should

This is called "unequal appraisal" and it's grounds for appeal even if your assessment matches market value.

Sign #5: Your Property Has Issues Not Reflected in the Assessment

The Red Flag: Your assessment assumes perfect condition but your property has:

• Foundation problems
• Old roof needing replacement
• Outdated HVAC system
• Deferred maintenance
• Functional obsolescence (weird layout, no garage, etc.)

Why Counties Miss This: Mass appraisal = drive-by guessing. They see your neighborhood, not your specific issues.

Common Missed Conditions:

• Foundation repair needs ($15,000-30,000 = 5-10% value impact)
• 20+ year old roof ($8,000-15,000 = 3-5% value impact)
• Original 1970s kitchen/bathrooms (10-15% value impact)
• Busy street location (5-10% value impact)
• No garage when neighbors have them (5-8% value impact)

Document Everything: Photos, repair estimates, and contractor assessments prove condition issues.

Quick Self-Assessment Checklist

Count how many apply to your property:

□ Assessment increased >10% without improvements □ Similar neighbor homes assessed lower □ Recent comparable sales below your assessment □ Your assessment ratio exceeds area median □ Property has unreflected condition issues

Score:

• 1-2 signs: Possibly over-assessed. Worth investigating.
• 3-4 signs: Likely over-assessed. Strong appeal potential.
• 5 signs: Definitely over-assessed. Appeal immediately.

What Happens If You're Over-Assessed and Do Nothing?

Let's be clear about the cost of inaction:

$25,000 over-assessment = $625/year extra (at 2.5% tax rate)

Over 10 years, that's $6,250 in unnecessary taxes. Plus you can't get refunds for past years — only current and future savings.

Every year you wait is money permanently lost.

Your Next Step: Get the Exact Numbers

Knowing you're over-assessed is step one. Proving it requires:

1. Finding the right comparable sales
2. Calculating proper adjustments
3. Presenting evidence in the format boards accept

You can do this yourself (budget 10-20 hours) or let AppealDesk generate everything in 5 minutes.

The 5-Minute Fix

Here's what most homeowners don't realize: Filing an appeal is not complicated when you have the right evidence. The boards know what over-assessment looks like. They see it every day.

Your job is simply to show them:

• What similar homes sold for
• What your home is assessed at
• The difference

With proper documentation, 89% of appeals succeed. Without it, 88% fail.

The choice is yours: Spend weeks learning the process or spend $49 for a professional packet that wins.

State-Specific Over-Assessment Indicators

Texas

Watch for assessments above 100% of market value. Texas has no state income tax, so property taxes are aggressive.

California

Post-Prop 13 reassessments upon sale often overshoot. New owners are particularly vulnerable.

Illinois

Cook County's multipliers create systematic over-assessment. Check your township's ratio.

Florida

Non-homestead properties face aggressive increases. Save Our Homes cap doesn't protect investment properties.

Bottom Line

If even one of these signs applies to you, it's worth checking your assessment. If two or more apply, you're almost certainly overpaying.

The average successful appeal saves $1,847 per year. Forever.

Don't be part of the 98% who just pay whatever shows up. Be part of the 2% who know better.

Remember: Counties count on your inaction. Every year you wait is money you'll never get back.