Property tax math that keeps value, exemption, and rate in the right order.
Start with taxable value or calculate it from appraised value. Then convert the rate, see every step, and check the annual result.
Taxable value / 100 x rate per $100. If the rate is in mills, divide it by 10 first. If the question gives appraised value and an exemption, subtract the exemption before applying the rate.
If the question gives taxable value, use it directly. Do not subtract an exemption again.
Subtract an exemption only when the question starts with appraised value.
One mill is $1 per $1,000, which equals $0.10 per $100 of taxable value.
Keep the entered rate intact and round the final dollar result using standard rules.
Start with the value the question gives.
This choice prevents the most common mistake: subtracting an exemption twice.
Texas states tax rates per $100 of value. A mills mode is included for questions that use the per-$1,000 unit.
Texas rates are stated per $100 of value. Divide the taxable value by 100, then multiply by the rate. Dividing by 1,000 is the mills unit.
The question already gives taxable value, so do not subtract an exemption a second time.
Use the taxable value directly. The exemption has already been reflected in that number.
If the question requires the 10% residence-homestead appraisal cap, calculate that appraised value first. New improvements are added separately under Texas law.
A live Texas bill can have several taxing units with different rates and exemptions. Calculate each unit separately when their taxable values differ.
The calculator uses the full entered rate and rounds the final dollar amounts to the nearest cent. The monthly figure is the annual total divided by 12, not a payment schedule.
Email the cheat sheet and this calculation.
Get the formula, trap reminders, and your current breakdown in one printable study note.
Try five Texas property tax traps without the calculator.
A home has a $260,000 taxable value and a tax rate of $2.10 per $100 of value. What is the annual property tax?
Choose the right starting value.
The multiplication is easy once the value and rate units are identified correctly.
The question gives taxable value
Use it directly. Taxable value already reflects the exemption or other adjustment used to produce it.
The question gives appraised value and an exemption
Subtract the exemption first. The result is the taxable value to which the tax rate applies.
The rate is stated in mills
Divide the mill rate by 10 to get dollars per $100. For example, 21 mills equals $2.10 per $100 and a 2.10% effective rate.
Three property-tax setups to practice.
Each example keeps the rate denominator visible so the formula can be checked without guessing.
$260,000 taxable value at $2.10 per $100
The effective percentage rate is 2.10%. No exemption is subtracted again.
$300,000 appraised value, $140,000 exemption, example $1.00 rate
The $140,000 exemption is the current mandatory general school-district amount. The $1.00 rate is only an arithmetic example.
$260,000 taxable value at 21 mills
Twenty-one mills also means $21 per $1,000 and an effective rate of 2.10%.
Four details that protect the answer.
Do not subtract an exemption twice
Taxable value is the final base. Appraised value is reduced by an applicable exemption to reach that base.
Match the denominator to the rate
Divide by 100 for a rate per $100. A mill rate is per $1,000 and converts to the per-$100 rate by dividing by 10.
Apply the residence-homestead cap first
The capped appraised value is generally the lesser of market value or the prior appraised value plus 10% plus qualifying new improvements.
Calculate taxing units separately when needed
School, city, county, and special-district exemptions can differ. One combined rate is accurate only when it applies to the same taxable value.
Build the rest of your real estate math skill.
What is the property tax formula for a rate per $100?+
Divide taxable value by 100 and multiply by the rate. A taxable value of $260,000 at $2.10 per $100 produces $5,460 in annual tax.
How do I convert mills to a rate per $100?+
Divide mills by 10. Twenty-one mills equals $21 per $1,000, $2.10 per $100, and an effective percentage rate of 2.10%.
Should I subtract an exemption from taxable value?+
No. Taxable value already reflects the applicable exemption. Subtract an exemption only when you are starting with appraised value.
What is the Texas school-district homestead exemption in 2026?+
The mandatory general residence-homestead exemption for school districts is $140,000. Other exemptions and taxing-unit rules can create different taxable values, so use the amount stated in an exam question or by the relevant appraisal district.
Can this calculator reproduce a live Texas tax bill?+
It can calculate one taxing unit or any group of rates that shares the same taxable value. If exemptions differ by taxing unit, calculate each unit separately and add the results. Confirm live values and rates with the appraisal district and tax assessor-collector.