How to Calculate Homestead Exemption in Texas: A Worked Example

To calculate a homestead exemption in Texas, take your home’s appraised value, subtract the exemptions that apply to each taxing unit separately, multiply each result by that unit’s tax rate, and add the pieces together. The math isn’t hard, but it has to be done once per taxing jurisdiction because school districts, counties, cities, and special districts each offer different exemptions on the same property.

The Three Numbers You Need Before You Start

Pull your most recent appraisal notice from your county appraisal district. You need three things from it:

Your home’s appraised value (and, if the 10% cap is active, the lower capped value).
Every taxing unit that bills you — school district, county, city, and any special districts such as hospital or community college districts.
Each unit’s tax rate for the year.

Then find out which optional exemptions each of those units has adopted. That information lives on your appraisal district’s website or with a phone call to their office. Optional exemptions vary sharply between neighboring cities, so two similar homes a few miles apart can owe very different amounts.

Start With the Capped Appraised Value

Once your homestead exemption is in place, Tax Code Section 23.23 limits how much your taxable appraised value can rise each year to 10%, plus the value of any new improvements you’ve added. The cap takes effect on January 1 of the tax year after your first year of qualifying for the exemption, so the first year you’re taxed at full market value.¹

In practice, this means your appraisal notice may show two values: a market value and a lower “limited” or “capped” value. Use the capped value as your starting point. In a rising market, the gap between the two is where most of your annual savings actually come from.

Subtract the School District Exemption

Every homeowner with a valid homestead exemption gets $140,000 off appraised value for school district taxes.² It’s automatic statewide, applied without any local vote. If your capped value is $400,000, the school district taxes only $260,000.

Separately, there’s a $3,000 constitutional exemption off assessed value for county taxes, authorized under Article VIII, Section 1-a of the Texas Constitution.² It’s small, but it comes off the county line every year.

Add Any Optional Local Exemption

Any taxing unit — city, county, school district, or special district — may adopt an optional homestead exemption of up to 20% of the appraised value. If 20% works out to less than $5,000, the exemption is $5,000 anyway.³ Whether a unit offers this at all, and at what percentage, is up to its governing body.

When calculating, apply each unit’s optional exemption only against that unit’s tax. A 10% city exemption does nothing to your county or school district bill.

A Full Worked Example

Take a home with a market value of $450,000 and an active 10% cap limiting the appraised value to $400,000. Assume a school district rate of 1.05%, a county rate of 0.40% with no optional exemption, and a city rate of 0.55% with a 10% optional exemption.

School district:

$400,000 − $140,000 = $260,000 taxable
$260,000 × 1.05% = $2,730

County:

$400,000 − $3,000 = $397,000 taxable
$397,000 × 0.40% = $1,588

City:

$400,000 − $40,000 (10% of $400,000) = $360,000 taxable
$360,000 × 0.55% = $1,980

Total bill: $2,730 + $1,588 + $1,980 = $6,298. Without any homestead exemption or cap, that same home at $450,000 market value would owe $9,000 at those combined rates. The exemptions and cap took more than $2,700 off the bill in this example. Your actual savings depend on your local rates and which optional exemptions your taxing units have adopted.

If your home has special districts on top of these three lines, run the same subtraction-then-multiplication for each one and add it to the total.

Add Extra Amounts if You Qualify

Certain homeowners subtract more before multiplying.

Age 65 or Older, or Disabled

If you’re 65 or older or have a qualifying disability, you get an additional $10,000 off for school district taxes, bringing the school district subtraction to $150,000. Other taxing units can adopt an additional exemption for these homeowners of at least $3,000, and many set it higher.² Check with your appraisal district for the amounts in your county and city.

A surviving spouse can keep the age-65 exemption on the property if the spouse who qualified was 65 or older, the surviving spouse was at least 55 at the time of death, and the home remains the surviving spouse’s primary residence.²

Disabled Veterans

Veterans with a service-connected disability receive an exemption that scales with the VA disability rating:

10% to 29% disability: $5,000 off appraised value.
30% to 49% disability: $7,500 off.
50% to 69% disability: $10,000 off.
70% to 99% disability: $12,000 off.
100% disability or individual unemployability: total exemption from all property taxes on the homestead.⁴

A 100% disabled veteran owes no property tax on the homestead regardless of the home’s value, and the surviving spouse of a veteran who held a 100% exemption may qualify to continue it.

The School District Tax Ceiling Freezes the School Line

In the year a homeowner turns 65 or becomes disabled, the school district calculates that year’s school tax, and that amount becomes the ceiling. Even if rates or appraised values climb, the school district portion of the bill cannot exceed the ceiling from then on. Counties and cities may adopt a ceiling too, though not all do. Once a ceiling is in place, the school district line on your bill stops responding to rate hikes or appraisal increases — the arithmetic above still describes how it was set, but the frozen number is what you pay.

If you move within Texas, a proportional version of the ceiling can transfer to the new home.

What Your Home Has To Be for Any of This To Apply

The exemption covers a home you own as an individual (not through a corporation or business entity), use as your primary residence, and are not claiming an exemption on elsewhere for the same year.² It applies to up to 20 acres used for residential purposes. Houses, condominiums, and manufactured homes all qualify, including manufactured homes on leased land. Your Texas driver’s license or state ID must show the property’s address.

Since 2022, if you buy mid-year and the seller didn’t have a homestead exemption on the property that tax year, you can file immediately and get a prorated exemption for the rest of the year.³ In that first year the appraisal district can set your value at full market value; the 10% cap starts protecting you on January 1 of the following tax year.

Putting It All Together

The calculation for any Texas homeowner comes down to a repeating loop:

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Take the capped appraised value.

Subtract the exemptions that apply to that specific taxing unit (the $140,000 school exemption for the school district; the $3,000 constitutional exemption for the county; any optional local exemption; any age-65, disability, or disabled-veteran amount that unit recognizes).

Multiply by that unit’s tax rate.

Repeat for every taxing unit on the appraisal notice and add the results.

The numbers you plug in shift year to year as rates change and the capped value rises, but the structure of the calculation stays the same. Once you’ve run it for your own home, updating it next year is a matter of swapping in the new figures from the next appraisal notice.

1
State of Texas. Texas Code TAX 23.23
2
State of Texas. Texas Code Tax Code 11.13 – Residence Homestead
3
Texas Comptroller of Public Accounts. Property Tax Exemptions
4
Texas Comptroller of Public Accounts. Residence Homestead Exemption Application