Texas property tax is calculated by multiplying your property’s taxable value by the combined local tax rate, but the real story is in the details.
- Your county appraisal district determines your property’s market value each January 1, using sales data, property characteristics, and standardized appraisal methods.
- Exemptions like the $140,000 homestead exemption (retroactive to 2025) reduce your taxable value before any tax rate is applied.
- The average effective property tax rate in Texas is among the highest nationally, and rates vary widely by county based on local budget needs.
- Understanding your Texas property tax assessed value puts you in the best position to claim every exemption and challenge an unfair appraisal.
Texas homeowners pay some of the highest property taxes in the nation, with annual collections exceeding $81 billion across more than 4,600 local taxing units. Because Texas has no state income tax, local governments lean heavily on property tax revenue to fund schools, roads, and emergency services. That makes understanding how your tax bill is calculated essential for every homeowner.
Your Texas property tax assessed value is the foundation of your entire tax bill. If that number is wrong, everything else is too. This guide walks you through the full calculation process, updated to reflect the major legislative changes that took effect in 2025.
How Is Your Texas Property Tax Assessed Value Determined?
Your Texas property tax assessed value starts with the county appraisal district (CAD). Every year, the CAD estimates the market value of all taxable property in its jurisdiction as of January 1. Texas law (Tax Code Section 23.01) requires that all taxable property be appraised at 100% of fair market value, meaning the appraiser’s goal is to determine the price your property would sell for in a normal open-market transaction.
Appraisers catalog details like your property’s square footage, lot size, year built, number of bedrooms and bathrooms, condition, and any improvements. They then apply standardized valuation methods to assign your market value. The CAD does not set your tax rate. Your tax rate is set separately by local taxing entities, and while you can challenge your appraised value through the protest process, you cannot protest your tax rate.
What Are the Three Methods Used to Value Your Property?
Appraisal districts rely on three established approaches to determine market value.
The sales comparison approach is the most common for residential properties. Appraisers compare recent sales of similar properties, then adjust for differences. This process involves evaluating roughly 40 different data points per property, which is why simply comparing your value to a neighbor’s without understanding these adjustments can be misleading.
The cost approach estimates what it would take to rebuild your property at current construction costs, minus depreciation. Land value is calculated separately and added. This works best for newer or unique properties with limited comparable sales.
The income approach is used primarily for rental and commercial properties, estimating value based on income potential. Most residential homeowners will not encounter this method directly.
Your Texas property tax assessed value should reflect real-world market conditions, and if your tax appraised value does not seem accurate, you have the right to challenge it.
What Determines Your Property Tax Rate in Texas?
Your property tax rate is the combined rate from every local taxing unit with jurisdiction over your property. According to the Texas Comptroller, more than 4,600 local taxing units across the state levy property taxes, including county governments, cities, school districts, and special purpose districts like hospital and water districts.
School district taxes typically make up the largest portion of your total bill, often accounting for half or more of the combined rate. City and county taxes cover law enforcement, fire protection, roads, and general operations. Tax rates are expressed per $100 of property value. The sum of all applicable rates becomes your total property tax rate.
Effective tax rates vary significantly by county. Harris County (Houston) has an effective rate of approximately 1.46%, while less populated counties may fall well below 1%. The statewide average is around 1.31%, compared to the national average of 0.89%. Under Texas law, if a taxing unit proposes a rate that would increase its revenue by more than 3.5% (excluding new property), it must receive voter approval.
How Is Your Texas Property Tax Bill Actually Calculated?
Here is the formula that determines your property tax bill:
Market Value − Exemptions = Taxable Value
Taxable Value × Tax Rate = Property Tax Owed
Say your home’s appraised market value is $400,000 and you have a homestead exemption. For the school district portion:
$400,000 − $140,000 (homestead exemption) = $260,000 (taxable value for school taxes)
If the school district rate is $1.00 per $100, your school tax would be $2,600. Add county ($0.40), city ($0.50), and special district ($0.15) rates applied to the full $400,000 (if those entities don’t offer additional homestead exemptions), and that adds $4,200, bringing your estimated annual total to $6,800.
Some cities and counties voluntarily offer their own homestead exemptions, which can lower your taxable value for those entities as well. Check with your local appraisal district to see which optional exemptions apply.
Which Exemptions Can Lower Your Texas Property Tax Assessed Value?
Texas offers several exemptions that directly reduce the taxable value of your property. These were significantly expanded by constitutional amendments passed by voters in November 2025, retroactive to January 1, 2025. Here are the most common:
- Residence Homestead Exemption: Reduces your taxable value by $140,000 for school district taxes on your primary residence, increased from $100,000. Some cities and counties also offer optional homestead exemptions of up to 20% of your property’s value.
- Over-65 or Disabled Homeowner Exemption: Provides an additional $60,000 reduction for school district taxes, creating a combined $200,000 exemption for qualifying homeowners. This exemption also locks in a tax ceiling, meaning your school tax amount cannot increase above the level set in the year you first qualified. You may claim one, but not both.
- Disabled Veteran Exemption: Offers partial exemptions from $5,000 to $12,000 depending on your VA disability rating. Veterans rated at 100% disabled receive a complete exemption from all property taxes on their homestead.
- Surviving Spouse Exemptions: Surviving spouses of military members killed in action, first responders killed in the line of duty, or 100% disabled veterans may qualify for full exemptions on their homestead.
Every unclaimed exemption is money left on the table. Texas does not have a deadline for filing a homestead exemption. You can apply as soon as you purchase your home and occupy it as your primary residence.
How Does the 10% Homestead Cap Protect You?
One of the most powerful protections for homeowners is the 10% homestead cap on appraised value increases. If you have a homestead exemption in place, your property’s appraised value cannot increase by more than 10% per year, plus the value of any new improvements.
For example, if your appraised value last year was $350,000 and the CAD determines this year’s market value is $420,000, the cap limits your appraised value to $385,000 ($350,000 + 10%). The difference is often called “cap loss” and represents built-in savings that accumulate over time.
This cap is especially valuable in rapidly appreciating markets. However, it only limits how quickly your appraised value can rise. If your market value plateaus, your appraised value will continue climbing at up to 10% annually until it catches up. For homeowners without a homestead exemption, such as those with investment properties, there is no cap.
What Happens After Your Texas Property Tax Assessed Value Is Set?
Each spring, the chief appraiser sends Notices of Appraised Value to property owners whose values have changed. For residences, notices are typically mailed by April 1. This is not a tax bill. It shows your proposed market value, prior year’s value, exemptions on file, and protest instructions.
If you believe your tax appraised value is too high or unequal compared to similar properties, you have the right to file a formal protest with the Appraisal Review Board (ARB). The deadline to file is May 15 or 30 days after the notice was mailed, whichever is later.
Why Protesting Your Tax Appraised Value Matters Every Year
Filing a property tax protest is one of the most direct ways to ensure you are paying a fair amount. When your tax appraised value is reduced, that lower number becomes the baseline for the next year’s appraisal. Over time, this creates compounding benefits, especially when combined with the 10% homestead cap. That is why experienced property tax professionals recommend protesting annually, even in years when your value does not appear dramatically high. The only way to confirm your tax appraised value is fair is to take it through the full protest process.
It is also worth noting that no company or individual can legally guarantee a specific dollar amount of savings on your property taxes. Be cautious of any service that promises a particular outcome. What matters most is that your property receives a thorough, complete protest handled by qualified local professionals who understand the appraisal process in your specific county. A fee structure that includes an upfront commitment ensures your property is fully represented through every stage, rather than being set aside when results are uncertain.
Your actual tax bill arrives in October, with payment due by January 31, long after the protest window for that year’s values has closed. That is why reviewing your notice in the spring and acting quickly is so important.
Frequently Asked Questions About Texas Property Tax Calculations
Here are answers to some of the most common questions Texas homeowners ask about how their property taxes are calculated.
Can I protest my tax rate, or only my appraised value?
You can only protest your appraised value. Tax rates are set by local taxing entities through their own budgeting process. If a taxing unit proposes a rate increase exceeding 3.5%, it must go to a voter election.
How often is my property reappraised in Texas?
Texas law requires reappraisal at least once every three years, but most counties reappraise all residential properties annually as of January 1. Review your notice each spring.
What if the appraisal district has wrong information about my property?
If the CAD has incorrect details like wrong square footage or bedroom counts, you do not need to file a formal protest. Contact your appraisal district directly to submit a correction form. Fixing data errors may also lower your appraised value.
Do I need to reapply for my homestead exemption every year?
No. Once approved, it stays in effect as long as you own and occupy the property. However, deed changes like adding a spouse, a divorce, or transferring into an LLC or trust may remove the exemption and require reapplication.
Take Control of Your Property Tax Bill Today
Your Texas property tax assessed value is the starting point for every dollar you pay in property taxes. Understanding how that value is determined, claiming every exemption you qualify for, and reviewing your appraisal notice each spring ensures you pay a fair amount and nothing more.
If navigating the appraisal process and annual protests feels overwhelming, Home Tax Shield’s licensed, local professionals handle everything for homeowners across Texas. With an average tenure of 18 to 22 years, their team takes your property through the full protest process from research and filing through every stage of the hearing, so you know with certainty whether your tax appraised value is fair. Get started today and let the experts go to work for you.