The basic formula for Texas sales tax

To calculate sales tax in Texas, multiply the pre-tax price by the current tax rate, then add that amount to the original price. The formula is: Pre-tax price × Tax rate = Sales tax amount. Then add the sales tax to the pre-tax price to get your total.

Texas has a state sales tax rate of 6.25 percent. However, most purchases are also subject to local sales tax — city and county taxes that stack on top of the state rate. Your total tax rate depends on where you make the purchase, not where you live. A store in Austin charges a different rate than a store in Houston, even though both are in Texas.

The combined rate in most Texas cities ranges from 8.25 percent to 8.875 percent, though some areas go higher. You can find your exact local rate by entering your ZIP code into the Texas Comptroller's tax rate lookup tool at comptroller.texas.gov.

Key Takeaways

  • Texas state sales tax is 6.25 percent, but your actual rate includes local taxes and typically falls between 8.25 and 8.875 percent depending on your city and county.
  • To calculate the tax amount, multiply the pre-tax price by your combined tax rate as a decimal (for example, 8.25 percent becomes 0.0825).
  • The Texas Comptroller's website has a ZIP code lookup tool that shows the exact combined rate for any Texas address.
  • Some items are tax-exempt in Texas, including groceries, prescription medications, and certain medical equipment, so the tax formula does not apply to everything you buy.

Working through a real calculation step by step

Say you buy a pair of shoes for $50 in Dallas, where the combined sales tax rate is 8.25 percent. First, convert the percentage to a decimal: 8.25 percent becomes 0.0825. Then multiply: $50 × 0.0825 = $4.13. That $4.13 is your sales tax. Your total cost is $50 + $4.13 = $54.13.

If you are buying multiple items, add up all the pre-tax prices first, then apply the tax to the total. A $30 shirt and $50 shoes come to $80 before tax. At 8.25 percent, the tax is $80 × 0.0825 = $6.60. Your total is $80 + $6.60 = $86.60.

Most store registers calculate this automatically and show the tax separately on your receipt. The math matters most when you are budgeting before you shop, comparing prices online, or checking whether a receipt is correct.

Finding your exact local tax rate

Your combined rate depends on the location of the store, not your home address. If you live in one city and shop in another, you pay the tax rate where the store is located. This matters most for people who shop near city or county borders.

The Texas Comptroller maintains a searchable database at comptroller.texas.gov/taxes/sales/rates. Enter your ZIP code or city name and you will see the state rate, the local rate, and the combined total. Rates change occasionally when cities or counties adjust their local taxes, so checking before a large purchase is worth the time.

You can also call the Texas Comptroller's office at 1-800-252-5555 to ask about the rate for a specific address. Local city and county tax assessor offices also have this information.

Items that are not subject to sales tax in Texas

Not everything you buy in Texas is taxed. Groceries — food you cook at home — are not subject to sales tax. This includes bread, milk, vegetables, meat, and canned goods. Restaurant meals and prepared foods are taxed, even if you take them home.

Prescription medications are tax-exempt when filled by a licensed pharmacist with a valid prescription. Over-the-counter medicines like aspirin or cold medicine are taxed. Medical equipment prescribed by a doctor — such as wheelchairs, oxygen equipment, or diabetic supplies — is usually exempt, though the rules vary by item.

Clothing and shoes are taxed in Texas, unlike some other states. School supplies, office supplies, and tools are all taxed. If you are unsure whether a specific item is taxed, ask the cashier or check the Texas Comptroller's website for a list of tax-exempt items.

Calculating tax on online and out-of-state purchases

When you order online from a Texas retailer and have it shipped to a Texas address, sales tax is calculated based on the destination ZIP code — where you receive the item. The retailer collects the tax at checkout.

Purchases from out-of-state retailers follow different rules. Many large online retailers now collect Texas sales tax automatically. Some smaller retailers do not. If tax was not collected at purchase, Texas law requires you to pay use tax — which is the same rate as sales tax — when you file your state tax return. In practice, most individuals do not report use tax, but it is technically owed.

For business purchases, the rules are stricter. Businesses must track and report use tax on out-of-state purchases. If you are buying for a business, keep receipts and consult a tax professional about your reporting obligations.

Common mistakes when calculating sales tax

The most common error is using the wrong tax rate. People often remember the state rate of 6.25 percent and forget to add local taxes. Always look up your specific location's combined rate before calculating.

Another mistake is applying tax to items that are exempt. Groceries are the biggest category — many people assume all food is taxed and budget incorrectly. Check your receipt after shopping; if you bought groceries and see tax charged, ask the cashier to correct it.

A third error happens with multi-item purchases: calculating tax on each item separately instead of on the total. This usually makes only a small difference due to rounding, but it is mathematically incorrect. Add all pre-tax prices first, then apply tax once.

Frequently Asked Questions

What is the difference between sales tax and use tax in Texas?

Sales tax is collected by the retailer when you buy something in Texas. Use tax is owed on items you buy from out-of-state sellers who do not collect Texas tax. The rate is the same; the difference is who collects it and when. Most people encounter use tax only on business purchases or high-value items.

Do I pay sales tax if I buy something online from a Texas store?

Yes. If the retailer is based in Texas or has a physical presence in Texas, they must collect sales tax based on your delivery address. The tax is calculated at checkout and added to your total. Out-of-state retailers may or may not collect tax depending on their policies and size.

Can I use a tax-exempt certificate to avoid paying sales tax?

Only if you are making a business or resale purchase. Nonprofits, government agencies, and businesses buying for resale can provide a tax-exempt certificate to retailers. Individual shoppers cannot use this certificate for personal purchases, even if they have a business license.

What if the sales tax on my receipt does not match my calculation?

Small differences of a few cents are usually due to rounding — the register rounds to the nearest cent. If the difference is larger or the tax rate seems wrong, ask the cashier to check the rate for your location. Keep your receipt and contact the store if you believe you were overcharged.

Does Texas charge sales tax on services?

Most services are not subject to sales tax in Texas. Haircuts, repairs, consulting, and labor are generally tax-free. However, some services bundled with products — like installation or delivery — may be taxed. Ask the business whether a specific service is taxed before you pay.