Sales tax is a percentage added to the price of goods or services at the point of sale

The amount you owe depends on two things: the price of what you are buying, and the sales tax rate where you are buying it. The rate varies by state and sometimes by county or city. To find what you owe, multiply the pre-tax price by the tax rate as a decimal, then add that amount to the original price.

Most states charge between 4 and 10 percent. Some states charge no sales tax at all. If you live in one state but buy something in another, you pay the tax rate of the state where the purchase happens — not where you live. Online purchases follow the same rule: you pay the tax rate of the state the seller ships from, or in some cases the state where you live.

You do not need to file anything or report sales tax you paid on personal purchases. Sales tax is collected by the seller and sent to the state. If you own a business, the rules are different — you collect sales tax from customers and remit it to your state on a schedule they set.

Key Takeaways

  • Sales tax rate varies by state, county, and sometimes city, so the same item costs different amounts in different places.
  • To calculate the tax you owe, multiply the item price by the tax rate as a decimal and add the result to the original price.
  • You pay the sales tax rate of the location where the purchase happens, not where you live.
  • The seller collects and remits sales tax to the state — you do not file or report it on your personal tax return.
  • Some items are exempt from sales tax in certain states, such as groceries, prescription medications, or clothing.

Finding your state and local sales tax rate

Start by identifying which state's rate applies. If you are shopping in a physical store, use the rate where that store is located. If you are ordering online, check the seller's website or contact them to confirm which state's rate they charge.

The easiest way to find your rate is to search "[your state] sales tax rate" in any search engine. Each state's Department of Revenue or Department of Taxation publishes the current statewide rate on their website. If your city or county adds a local tax on top of the state rate, that information is also on the state website, usually in a table organized by county or city.

Some states have no sales tax at all: Alaska, Delaware, Montana, New Hampshire, and Oregon. If you live in one of these states but buy something in a state that does charge sales tax, you pay that state's rate at checkout.

The formula for calculating sales tax

The math is straightforward. Take the price before tax, multiply it by the tax rate expressed as a decimal, and add the result to the original price.

Here is the formula:

Price before tax × (Tax rate ÷ 100) = Tax amount

Price before tax + Tax amount = Total price

Example: You buy a shirt for $40 in a state with a 7 percent sales tax rate. Multiply $40 by 0.07 (which is 7 percent as a decimal). That equals $2.80 in tax. Add $2.80 to $40 to get $42.80 total.

If your state or county has multiple tax rates stacked together — for instance, 5 percent state plus 2 percent county — add them first. In that case, the combined rate is 7 percent, and you use 0.07 in the formula.

Items that may be exempt from sales tax

Some purchases are not subject to sales tax, but the rules vary widely by state. The most common exemptions are groceries, prescription medications, and medical equipment. A few states exempt clothing. Some states do not tax services, while others tax certain services but not others.

If you are unsure whether a specific item is taxable in your state, check your state's Department of Revenue website or ask the cashier at checkout. The seller is responsible for charging the correct tax, so if you think you were charged incorrectly, you can ask them to explain why.

Exemptions do not appear on your tax return. The seller straightforward does not charge tax at the register. You do not need to claim anything or provide documentation to receive an exemption — the seller applies it automatically when you buy an exempt item.

Sales tax on online and mail orders

Online retailers are required to charge sales tax based on where the item ships to. If you order from a company that has a physical location in your state, they charge your state's rate. If they do not have a location in your state, they may or may not charge tax depending on their business structure and the state's rules.

When you check out online, the tax should appear as a separate line item before you complete the purchase. The total price shown at the end includes tax. If no tax appears and you live in a state that has sales tax, contact the seller to ask why.

You do not report online purchases separately on your tax return. The sales tax you pay is final — there is nothing to claim or deduct later.

What happens if you overpay or underpay sales tax

If a seller charged you too much sales tax, you can ask them for a refund. Keep your receipt and contact their customer service. Most retailers will issue a refund if you catch the error within a reasonable time.

If you underpaid — for instance, the seller forgot to charge tax — you are not responsible for tracking them down and paying it. The seller is responsible for collecting the correct amount. If the state audits the seller later, the seller owes the tax plus penalties, not you.

On your personal tax return, you do not report or deduct sales tax you paid on purchases. Sales tax is a point-of-sale transaction between you and the seller. The only exception is if you own a business — in that case, you may be able to deduct sales tax paid on business purchases, but that is a separate calculation handled on your business tax return.

Sales tax on specific types of purchases

Most tangible goods — clothing, electronics, furniture, groceries — are subject to sales tax unless your state has a specific exemption. Services are taxed differently depending on the state. Some states tax haircuts, repairs, and consulting; others do not.

Vehicles, fuel, and alcohol often have their own tax rates separate from general sales tax. Some states charge a higher tax on alcohol or fuel. Vehicle purchases may be subject to both sales tax and a separate registration or title fee. Check your state's Department of Revenue website for rates on these categories.

If you are buying something unusual and are not sure whether tax applies, ask the seller before you buy. They should be able to tell you whether the item is taxable in your state.

Frequently Asked Questions

Do I pay sales tax on items I buy online from out-of-state sellers?

Yes, if the seller ships to your state. You pay the sales tax rate of the state where the item is shipped to, which is usually your state. The seller is responsible for charging the correct rate at checkout. If they do not charge tax and your state has a sales tax, contact them to ask why.

Can I deduct sales tax on my personal tax return?

No. Sales tax you pay on personal purchases is not deductible on your individual tax return. If you own a business, you may be able to deduct sales tax paid on business purchases, but that is handled separately on your business return, not your personal return.

What if the sales tax rate changed between when I bought something and when I got my receipt?

You pay the rate that was in effect on the date of purchase. The tax amount shown on your receipt is correct. Rates do change occasionally, but the seller charges based on the rate on that day.

How do I know if groceries are taxed in my state?

Search "[your state] grocery sales tax" or visit your state's Department of Revenue website. Most states exempt unprepared groceries but tax prepared foods, hot foods, and restaurant meals. The rules vary, so check your specific state.

Am I responsible for paying sales tax if the seller forgot to charge it?

No. The seller is responsible for collecting and remitting the correct sales tax. If they made a mistake, that is between them and the state. You are not liable for tax the seller failed to charge.