Sales tax is a percentage of the purchase price added at the point of sale, and the rate depends on where you buy, not where you live

Sales tax is not one national rate. It is set by states, and within states by counties and cities, so the same item costs different amounts in different places. When you buy something, the seller adds the tax to your bill based on the tax rate where the sale happens — the store's location, or the location you have it shipped to if you order online.

The tax you pay funds state and local services: roads, schools, police, libraries. It is separate from income tax and FICA (the payroll taxes taken from your paycheck). You do not file sales tax on your personal tax return. Businesses that collect it send it to the state or local tax authority on a schedule — usually monthly or quarterly.

Understanding how sales tax is calculated matters because it changes what you actually pay, and it affects how much you budget for purchases. It also matters if you sell things yourself, because you may need to collect and send in sales tax even if you do not think of yourself as running a business.

Key Takeaways

  • Sales tax rates vary by state and by county or city within that state, ranging from zero percent in some states to over 10 percent in some cities.
  • To calculate sales tax, multiply the purchase price by the tax rate as a decimal — for example, a $100 item in a 7 percent tax area costs $107.
  • Sales tax applies to most goods but often does not explore to groceries, prescription medications, or services like haircuts, depending on state law.
  • Online purchases are taxed based on where the item is shipped to, not where you live or where the seller is located.
  • If you sell items — whether at a garage sale, online marketplace, or small business — you may be required to collect and remit sales tax to your state.

The basic math: how to calculate what you owe

Sales tax calculation is straightforward multiplication. Take the price of the item before tax, multiply it by the tax rate expressed as a decimal, and add the result to the original price.

If you buy a shirt for $50 in a place with 8 percent sales tax, the math is: $50 × 0.08 = $4. Your total is $50 + $4 = $54. If you buy the same shirt in a place with 6 percent tax, it is $50 × 0.06 = $3, for a total of $53. The difference is $1 per $50 spent — small on one item, but it adds up across a year of purchases.

Most stores show you the tax separately on the receipt so you can see the breakdown. Online retailers often show the tax at checkout before you confirm the order. If you are budgeting for a purchase and only know the sticker price, add the local tax rate to get the real cost you will pay.

Where to find the sales tax rate for your location

Sales tax rates are public information, but they are not always straightforward to find because they change by location and sometimes by item type. Your state's Department of Revenue or Department of Taxation website lists state rates and usually links to county and city rates as well.

A faster route is to search "[your city] sales tax rate" or "[your county] sales tax rate" online. Tax software like TurboTax and H&R Block also have rate finders. If you are buying online, the retailer's website will calculate the tax for your shipping address at checkout, so you do not have to look it up yourself.

Rates change occasionally — usually once or twice a year — so if you are planning a large purchase, check the current rate rather than relying on what you remember from last year. Some states raise rates temporarily to fund specific projects, then lower them again.

What is and is not taxed

Most states exempt certain items from sales tax, and the rules vary significantly. Groceries — food you cook at home — are not taxed in most states, but prepared food and restaurant meals are. Prescription medications are typically exempt, but over-the-counter drugs and vitamins often are not. Clothing is taxed in most states, but some states exempt it or exempt items below a certain price.

Services are usually not subject to sales tax. A haircut, a doctor visit, a plumber's labor, or a lawyer's information are generally not taxed, even though the products used in those services might be. However, some states tax specific services like dry cleaning, car repairs, or pest control.

The safest approach is to assume an item will be taxed unless you know otherwise. If you are buying something and the tax seems wrong, ask the cashier or check your receipt. If you are selling items and unsure whether they are taxable, contact your state's Department of Revenue — they have staff who answer these questions.

How online purchases are taxed

Online sales tax is based on where the item is shipped, not where you live or where the seller is based. If you order something from a company in California and have it shipped to your home in Texas, you pay Texas sales tax (or no tax, if Texas does not tax that item). If you have it shipped to a friend in New York, you pay New York tax.

Large online retailers like Amazon, Walmart, and Target collect sales tax on all orders because they have warehouses and operations in most states. Smaller sellers on marketplaces like eBay or Etsy may not collect tax automatically — in those cases, you are technically responsible for reporting the purchase on your state tax return, though enforcement is rare for individual purchases.

If you are buying from a seller outside the United States, sales tax does not explore, but you may owe federal import duties or your state may charge a use tax (a tax on items brought into the state from out of state). This is uncommon for small personal purchases but matters if you are importing goods regularly.

Sales tax if you are selling items

If you sell things — whether at a garage sale, through an online marketplace, or as a business — you may need to collect and send sales tax to your state. The rules depend on what you are selling, how much you sell, and whether you are doing it occasionally or regularly.

Garage sales and one-time sales of personal items are usually not taxed. If you sell used clothing or furniture once, you do not need to collect tax. But if you sell items regularly — even on a part-time basis through Facebook Marketplace, eBay, or Etsy — your state may require you to register for a sales tax permit and collect tax on each sale.

The threshold varies by state. Some states require registration if you make any sales at all; others have a minimum dollar amount or number of transactions. Marketplaces like Amazon and eBay provide forms (1099-K) if you sell above a certain threshold, which signals to the IRS that you have income. Contact your state's Department of Revenue to find out whether you need a permit. Many states have online registration that takes 15 minutes.

Sales tax versus use tax: what is the difference

Use tax is a tax on items you buy outside your state and bring into your state, or buy online from a seller who does not collect sales tax. It is meant to prevent people from avoiding sales tax by shopping across state lines. The rate is usually the same as your state's sales tax rate.

In practice, use tax is rarely enforced for individual purchases. You are supposed to report it on your state income tax return, but most people do not, and states do not pursue individuals for small amounts. However, if you buy a car out of state or import goods as a business, use tax can be significant and is actively enforced.

The key difference: sales tax is collected by the seller at the point of sale. Use tax is your responsibility to report and pay if the seller did not collect it. For most personal shoppers, this distinction does not matter because large retailers collect sales tax anyway.

Frequently Asked Questions

Do I pay sales tax on everything I buy?

No. Most states exempt groceries, prescription medications, and services. Some states also exempt clothing or items below a certain price. Prepared food, restaurant meals, and most non-prescription items are usually taxed. Check your state's Department of Revenue website for a full list of what is and is not taxed in your area.

Why is the total on my receipt different from what I calculated?

You may have calculated tax on only part of your purchase. If you bought both taxable and non-taxable items, tax applies only to the taxable ones. Also, some stores round tax to the nearest cent, which can add or subtract a penny from your calculation. Check your receipt to see which items were taxed.

If I buy something online from out of state, do I owe sales tax?

Yes, if the item is shipped to your state. You pay the sales tax rate of the state where it is delivered. If the seller does not collect it, you are technically responsible for reporting use tax on your state return, though this is rarely enforced for individual purchases.

Can I get sales tax back if I return something?

Yes. When you return an item, the store refunds both the price and the tax. The refund appears as a credit on your receipt or back to your payment method. Keep your receipt to prove you returned the item.

What happens if a business does not collect sales tax?

The business owes the tax to the state, not you. If you discover a seller is not collecting tax when they should be, you can report it to your state's Department of Revenue. As a buyer, you are not liable for the seller's failure to collect.