Calculate Texas sales tax
You may be checking an invoice, checkout screen, or sales tax return because the charged rate does not match the rate you expected. The open record shows the purchase amount and combined rate, but it may not identify each taxing jurisdiction.
The common mistaken assumption is that a ZIP code determines the local rate. Jurisdiction boundaries can differ, creating a risk of collecting or reporting the wrong amount.
Your next decision is whether the entered rate is correct for the transaction location.
Use this calculator to estimate the amount due on a taxable purchase. Enter the verified rate for the transaction location.
- Purchase amount: $________
- State rate: 6.25%
- Local rate: ________%
- Combined rate: ________%
- Estimated sales tax: $________
- Total including tax: $________
The local rate is the part to verify with the Texas Comptroller of Public Accounts, the state agency that administers Texas sales and use tax, before using the result.
What does the result mean?
The estimate separates the purchase amount, sales tax, and total due. The state component is 6.25%.
Applicable local components can add up to 2%, producing a combined rate from 6.25% to 8.25%. The local amount depends on which city, county, transit authority, or special-purpose district applies to the transaction.
This estimate assumes the full entered amount is taxable and that one combined rate applies. It does not determine whether an item, service, purchaser, or sales-tax holiday qualifies for different treatment.
The methodology explains the calculation.
This sales tax calculator uses the tax rate you enter. Compare current tax rates before relying on the tax estimate, and keep the verified sales tax record with the transaction documentation.
Verify the applicable local taxing units and combined rate before treating the estimate as the amount to collect or report.
How is Texas sales tax calculated?
In plain terms, apply the combined rate to the taxable amount. The formula is taxable amount × combined sales tax rate, with the percentage converted to a decimal.
The total is taxable amount + sales tax. Round the result to the nearest cent for this estimate.
The rates and limitations were checked on August 11, 2026, against the Texas Comptroller’s seller guidance and city sales and use tax resources. This calculator is independent, is not a filing system, and does not provide personalized accounting or legal advice.
A worked example shows the method.
Use the taxable-amount field and verified combined-rate field, then confirm the result against current Comptroller guidance.
What is a worked sales tax example?
Example: A $240 taxable sale at an 8.25% combined rate produces $19.80 in sales tax: $240 × 0.0825 = $19.80. The customer’s total is $240 + $19.80 = $259.80.
For contrast, the same taxable sale at the 6.25% state-only rate produces $15.00 in tax and a $255.00 total. The $4.80 difference comes from local charges.
This contrasting case applies only when no local sales-tax component is due.
Verify the address, transaction sourcing, and applicable local taxing units with the Comptroller before collecting tax.
Frequently asked questions
How accurate is this calculator? The estimate is accurate for the amount and rate entered, but the filing calculation can change when the transaction has a different tax classification or is sourced to different local taxing units.
Does the calculator find local rates by ZIP code? No. Jurisdiction boundaries do not necessarily follow ZIP codes.
Use the Comptroller’s address-based Sales Tax Rate Locator.
Are entries private? This page does not claim storage or processing protections beyond those stated in the site’s privacy policy. Avoid entering customer-identifying information.
What should a business do next? Confirm that the sale is taxable, verify the applicable rate and sourcing rule with the Comptroller, then compare the result with the sales tax return or checkout record before filing.