Texas Property Tax Appeal Calculator
If your property's assessed value is higher than its current market value, you may be overpaying property taxes. Enter your county, assessed value, and an estimated market value below to see how much a successful appeal could save you each year.
Estimate your over-assessment
From your latest tax assessment notice
Recent sale of your home or comparable properties
Estimates are for planning purposes only. Actual savings depend on the outcome of your appeal, exemptions, and local levy decisions. Not legal or tax advice.
How property tax appeals work in Texas
In Texas, property owners protest their appraisal district's value by filing a Notice of Protest with the county Appraisal Review Board (ARB). Most protests are resolved at an informal hearing with an appraisal district representative; unresolved cases proceed to a formal ARB hearing.
Filing deadline
The deadline to file a Notice of Protest is May 15, or 30 days from the date the appraisal notice was mailed — whichever is later. File early to allow time to gather comparables before your hearing.
Documents typically needed
- Completed Notice of Protest form (available from your county appraisal district)
- Recent sales of comparable properties in the same neighborhood
- Independent appraisal or broker price opinion
- Documentation of any condition issues affecting market value (repair estimates, inspection reports)
Tips for a stronger appeal
- Texas uses January 1 market value — use sales from the prior calendar year as your comparables.
- Request a copy of the appraisal district's evidence package before your hearing so you know what comps they used.
- Informal hearings settle most protests; come prepared with 3–5 strong comps and a clear ask.
- Services like Ownwell file and argue the protest on your behalf, charging only if they win savings.
Texas property tax appeal — frequently asked questions
What is a property tax appeal in Texas?
A property tax appeal is a formal request to have your property's assessed value reviewed and potentially lowered. In Texas, assessments are used to calculate your annual property tax bill — if your assessed value is higher than your home's actual market value, you may be paying more than you should. Filing an appeal with the Appraisal Review Board (ARB) allows you to challenge the assessment using comparable sales and other evidence.
How do I know if I'm over-assessed in Texas?
Compare your assessed value (shown on your tax bill or assessment notice) to recent sale prices of similar homes in your neighborhood. If your assessed value is materially higher than what comparable homes have sold for, you may be over-assessed. The calculator above estimates your potential overpayment using your county's current effective tax rate.
How much can I save by appealing my property taxes in TX?
Savings depend on the size of the over-assessment and your county's tax rate. For example, if your property is assessed $50,000 above market value and your county's effective rate is 2%, a successful appeal could save approximately $1,000 per year. Use the calculator above to estimate your specific situation. Savings persist year over year as long as the lower assessment holds.
What is the deadline to appeal property taxes in Texas?
The deadline to file a Notice of Protest is May 15, or 30 days from the date the appraisal notice was mailed — whichever is later. File early to allow time to gather comparables before your hearing.
What documents do I need to appeal my property taxes in Texas?
The most important evidence is comparable recent sales (comps) of similar properties in your neighborhood. You will also need: Completed Notice of Protest form (available from your county appraisal district); Recent sales of comparable properties in the same neighborhood; Independent appraisal or broker price opinion; Documentation of any condition issues affecting market value (repair estimates, inspection reports). The stronger your comparables, the better your chances of a successful appeal.
Who hears property tax appeals in Texas?
In Texas, assessment appeals are heard by the Appraisal Review Board (ARB). You can represent yourself or hire a property tax attorney or a third-party appeal service. If you disagree with the board's decision, further appeal to the state tax court is typically available.
What happens after a successful property tax appeal in Texas?
If your appeal succeeds, your assessed value is reduced to the approved amount. Your annual tax bill is then recalculated using the new lower assessed value and the applicable tax rate. The reduction generally applies to the tax year in which you filed; future years are not automatically adjusted, but the lower assessment often carries forward unless the assessor revalues your property.
Can I use a service to appeal my property taxes instead of doing it myself?
Yes. Third-party appeal services like Ownwell handle the research, paperwork, and hearing on your behalf. They typically charge a percentage of the first year's savings — if they don't save you money, you pay nothing. This can be a practical option if you don't have time to pull comparables and prepare a case yourself.
Related tools
Estimates are for planning purposes only. Actual appeal outcomes and tax savings depend on comparable sales evidence, the board's decision, exemptions, and local levy rates. This is not legal or tax advice. Methodology.