Sales tax rates are published by your state's Department of Revenue and by individual counties or cities
You do not need to calculate sales tax yourself or guess at the rate. Every state that collects sales tax publishes its current rate online, and most allow you to search by zip code or county. The rate you pay depends on where the sale happens — the location of the store or the delivery address, depending on what you are buying. State websites are free and updated when rates change, which happens several times a year in most places.
The fastest way to find your rate is to go directly to your state's Department of Revenue website and use their tax rate lookup tool. If you know your county or city, you can also call the local tax assessor's office; they answer this question dozens of times a day and can tell you the rate in under a minute.
Key Takeaways
- Your state's Department of Revenue website has a searchable tool where you enter your zip code or county and get the current combined state and local rate.
- Sales tax rates change multiple times per year, so a rate you found six months ago may no longer be correct.
- The rate that applies is usually where the buyer receives the item, not where the seller is located.
- If you cannot find your rate online, your county tax assessor's office can tell you over the phone at no cost.
How to use your state's Department of Revenue website
Every state that has a sales tax maintains a public database of current rates. Go to your state's official website — search "[your state] Department of Revenue" — and look for a link labeled "Sales Tax Rate Lookup," "Tax Rate Search," or "Find Your Tax Rate." Most states let you enter either a zip code or a street address and instantly see the combined state and local rate for that location.
Some states organize their lookup by county first, then by city or district within that county. Others let you search by address directly. The result will show you the state rate, the local rate (if any), and the total you owe. Write down the rate or take a screenshot, because rates change and you may need proof of what the rate was on a specific date.
If the website does not have a search tool, it will have a PDF or table listing all counties and their rates. Download the document for your county and save it; you may need it for tax records or disputes with a seller.
What to do if you cannot find your rate online
If your state's website is down, unclear, or does not cover your location, call your county tax assessor's office or your city's finance department. These offices exist specifically to answer tax questions and have no reason to charge you. Tell them your street address or zip code and ask for the current combined sales tax rate. They can also tell you whether certain items are taxed differently in your area — groceries, clothing, and medicine are often exempt or taxed at a lower rate.
If you are buying something online and the seller is in a different state, the rate that applies is usually the rate where you live (where the item will be delivered), not where the seller is. Some online retailers calculate tax based on the delivery address automatically; others ask you to enter your location. If you are unsure, enter your own address and check the tax amount before you complete the purchase.
Understanding why rates vary by location
Sales tax is not a single number. Your state sets a base rate, and then counties, cities, and special districts can add their own local tax on top. A state might have a 5% rate, but your county adds 1% and your city adds 0.5%, bringing your total to 6.5%. The rate one town over might be 6.25% because that city has a different local rate. This is why you cannot use a neighbor's rate or a rate from last year — you need the rate for your specific location on the current date.
Some states also tax certain items differently. Groceries might be taxed at 0% or 2%, while clothing is taxed at the full rate. Medicine and medical equipment are often exempt. Your state's Department of Revenue website usually lists these exceptions, or the tax assessor can tell you when you call.
Keeping track of rates for tax records
If you run a business, manage a budget, or need to dispute a charge, save the rate information you find. Take a screenshot of the Department of Revenue lookup result, including the date and the rate shown. If you printed a PDF, note the date you downloaded it. If you called the tax assessor, write down the date, time, and the name of the person you spoke with, along with the rate they gave you.
Rates change several times a year in most states, so a receipt from March may have a different rate than one from September. If a seller charged you a rate that seems wrong, you can look up what the rate should have been on that date and contact them with proof. Most Department of Revenue websites let you search historical rates as well as current ones.
Sales tax rates for major states
The following table shows where to find rates in the largest states. These links may change, so if a link does not work, search "[state name] Department of Revenue sales tax rate lookup" in your browser.
| State | Where to Find Rates | How to Search |
|---|---|---|
| California | cdtfa.ca.gov | Enter zip code in the tax rate lookup tool |
| Texas | comptroller.texas.gov | Search by city or zip code |
| Florida | floridarevenue.gov | Enter county name or zip code |
| New York | tax.ny.gov | Search by county and city |
| Pennsylvania | revenue.pa.gov | Enter zip code or county |
Frequently Asked Questions
Do I need to know the sales tax rate before I buy something?
Not always. Most stores and online retailers calculate and display the tax before you pay, so you see the total cost. You might want to know the rate beforehand if you are budgeting, comparing prices across locations, or checking whether a seller charged you correctly after the fact.
What if I buy something online from out of state?
The rate that applies is usually the rate where the item is being delivered to you, not where the seller is located. Enter your own address when you check out, and the retailer should calculate tax based on your location. If they do not ask for a delivery address, contact them before you buy to confirm which rate they will use.
Are groceries and medicine taxed differently?
It depends on your state. Some states do not tax groceries or medicine at all. Others tax them at a lower rate than other items. Check your state's Department of Revenue website or call your tax assessor to find out what is exempt or reduced in your area.
Can sales tax rates change after I buy something?
Rates can change, but only for future purchases. The rate that applied on the date you bought something is the rate you owe on that purchase. If you bought something last month and the rate changed this month, you do not owe the new rate on the old purchase.
What if the seller charged me the wrong rate?
Look up what the correct rate should have been on the date of your purchase using your state's Department of Revenue website. If the seller overcharged you, contact them with the proof and ask for a refund of the difference. Most retailers will correct an honest mistake.