Free Sales Tax Calculator

Sales tax sounds simple until you actually start trying to work backward.

You see something for $100. The store charges tax. Your receipt says $106.50. Okay, so where did the $6.50 come from? What if you only know the $106.50 total and want the original price? What if you know the original price and the final total but have no clue what tax rate they used?

Those are three different math problems. That is exactly why this calculator has three different modes. You do not need to memorize a formula first. You just need to ask: what numbers do I already know? Then choose the mode that matches.

One Purchase, Three Different Questions

Text equivalent: a $100 before-tax price plus a 6.5% sales tax rate produces $6.50 in tax, for a $106.50 after-tax total. If you know the before-tax price and the rate, use Find After-Tax Price. If you know the before-tax price and the after-tax total, use Find Tax Rate. If you know the after-tax total and the rate, use Find Before-Tax Price.

2026 State Sales Tax Rates

This table shows the statewide rate plus the population-weighted average local rate for each state as of January 1, 2026. The combined figure is useful for general comparisons, but it is NOT the exact sales tax rate for every city, county, ZIP code, address, or purchase.

Important: These are statewide rates and population-weighted local averages, not address-level tax quotes. Cities, counties, special districts, and individual products may have different rates or tax rules. Always confirm the actual rate for a transaction when accuracy matters.

Also note: Five states have no statewide general sales tax in the 2026 comparative data: Alaska, Delaware, Montana, New Hampshire, and Oregon. Alaska can still have local sales taxes.

How the Three Sales Tax Calculations Work

What Does "Before Tax" Mean?

The before-tax price is the price before sales tax is added. If the shelf price is $100, that is usually the number you're starting with. If the applicable sales-tax rate is 6.5%, the tax is $100 × 0.065 = $6.50. Now add the tax: $100 + $6.50 = $106.50.

So: before-tax price $100, sales tax $6.50, after-tax price $106.50. That is the basic sales-tax calculation.

What Does "After Tax" Mean?

After-tax price means the final amount after the sales tax has been added. You might also hear people call it the final price, total after tax, price including tax, or checkout total. If you are trying to figure out whether you have enough money for a purchase, this is usually the number you really care about.

A $1,500 laptop is not necessarily going to cost exactly $1,500 at checkout. If the applicable rate is 8%, then $1,500 × 0.08 = $120 tax, for a final total of $1,620. That $120 difference may matter when you are planning a larger purchase. If the purchase needs to fit inside your monthly spending plan, you can take the final amount into the Budget Calculator instead of budgeting from the shelf price alone.

How Do I Add Sales Tax to a Price?

This is the easiest direction. You know the original price and the sales-tax rate. Example: price $250, tax rate 7%. First convert 7% into decimal form: 7 ÷ 100 = 0.07. Then $250 × 0.07 = $17.50 tax. Add it: $250 + $17.50 = $267.50. You would pay approximately $267.50 under that simple tax scenario. That is what Find After-Tax Price does.

How Do I Find the Tax Rate From My Receipt?

Suppose your receipt shows a before-tax subtotal of $80 and a final total of $86. First find the amount of tax: $86 − $80 = $6. Now ask: what percentage of $80 is $6? $6 ÷ $80 = 0.075. Multiply by 100: 7.5%. So the calculated sales-tax rate is 7.5%. That is what the Find Tax Rate mode does automatically.

This can be useful when you're staring at a receipt thinking, "Okay, what rate did they actually charge me?" Just remember something important: the rate on a real receipt may combine more than one tax, including state sales tax, county tax, city tax, local-option tax, special-district tax, or another applicable local charge. So if your state says 6% and the receipt appears to show 7%, that does not automatically mean the store calculated it incorrectly. The state rate may only be one part of the total.

How Do I Remove Sales Tax From a Total?

This is where people usually get tripped up. Suppose you know the final total is $107 and the tax rate is 7%. You cannot simply calculate 7% of $107 and subtract it. Why? Because the 7% tax was not originally calculated from $107. It was calculated from the smaller original price.

The correct math is: $107 ÷ 1.07 = $100. So: before-tax price $100, sales tax $7, final total $107. That is why this calculator has Find Before-Tax Price. You give it the final total and the tax rate. It works backward.

Why Does Sales Tax Change From One Place to Another?

Because there may be more than one layer of sales tax. The 2026 comparative data shows 45 states with a statewide general sales tax, while local governments can add sales taxes in many states. Five states have no statewide general sales tax, although Alaska permits local sales taxes.

That means two people can buy the same $500 item in different places and pay different final totals. Imagine one location has a combined rate of 6%. Another has a combined rate of 9%. At 6%: $500 purchase, $30 tax, $530 total. At 9%: $500 purchase, $45 tax, $545 total. Same item, same shelf price, different tax rate. Difference at checkout: $15.

Now imagine the purchase is $20,000. A few percentage points start looking a lot bigger. This is why sales tax can matter when planning major purchases.

Why the Tax Rate Matters More on a Big Purchase

Purchase price: $10,000.

The purchase price never changed. Only the rate changed. Between 5% and 9%, the difference at checkout is $400. This is purely mathematical. It is not a claim that any particular 5%, 7%, or 9% rate applies to a specific location.

Why Doesn't the State Rate Always Match My Receipt?

Because the statewide percentage is not always the full story. Look at the state table on this page. It separates the state rate, average local rate, and average combined rate. The word average is important. If a state's average combined rate is 8.5%, that does not mean every address in that state charges exactly 8.5%. One city may be lower. Another may be higher. A particular county or special district may add another rate. And the type of product can matter too.

Use the state table for comparison and planning. Use the actual applicable local rate when you need an exact transaction amount.

Are Groceries, Clothing, and Medicine Always Taxed?

No. And this is where sales tax gets more complicated than simply multiplying every purchase by the same rate. States can define what is taxable differently. Depending on the jurisdiction and item, something may be fully taxable, taxed at a reduced rate, exempt, or treated under special rules. The 2026 state-tax comparison itself notes that states vary significantly in what their sales-tax base includes.

That is why this calculator does not try to decide whether your particular purchase is taxable. It calculates using the rate and taxable price you give it.

What Happens With Online Shopping?

A lot of people still remember when buying online sometimes seemed to mean avoiding sales tax. That is not a safe assumption anymore. In the 2018 South Dakota v. Wayfair decision, the U.S. Supreme Court rejected the old rule that physical presence was always necessary before a state could require certain remote sellers to collect sales tax.

Today, online sales-tax collection depends on state law, seller obligations, marketplace rules, transaction details, and where the purchase is being delivered. So do not assume "it's online, so there is no tax." If an online checkout displays an applicable tax amount, you can use this calculator to check the math.

What If the Seller Did Not Charge Sales Tax?

Depending on the state and transaction, a purchase that was not charged sales tax may still create a use-tax obligation. Sales tax and use tax are closely related concepts, but the rules vary by state. This calculator is designed to calculate the math of a tax rate. It does not determine whether you personally owe use tax or whether a specific purchase is legally taxable. For that, use the relevant state revenue agency's guidance.

Does Sales Tax Apply Before or After a Discount?

This is another question that sounds easier than it is. Imagine an item originally costs $200. Then the store gives you 25% off. The discounted price is $150. The tax calculation may then be based on the taxable sales price under the rules that apply to that transaction. But coupon, rebate, promotional, trade-in, and discount treatment can vary by jurisdiction and transaction type.

So this calculator should not make a legal taxability decision for the visitor. If you simply need to calculate the discount first, use the Discount Calculator. Then enter the applicable taxable amount into the Sales Tax Calculator.

Is Shipping Taxed?

It depends on the state, product, transaction, and how shipping or delivery charges are treated under the applicable rules. This calculator does not automatically assume shipping is taxable or exempt. Enter the taxable amount that applies to your situation.

Why Does a Few Percent Matter So Much on a Big Purchase?

Because sales tax is based on the taxable price. Let's compare. Purchase price: $30,000. At 6%: tax = $1,800, total = $31,800. At 8.5%: tax = $2,550, total = $32,550. Difference: $750.

Now the rate does not look like such a tiny detail anymore. This is why someone shopping for an expensive item may want to estimate the final amount instead of planning from the sticker price.

Why Does the State Table Show an "Average" Local Rate?

Because there can be many different local tax jurisdictions inside one state. Trying to represent every city and county with one number would be misleading. The published 2026 comparison uses population-weighted local averages to give people a general sense of how state and local rates compare.

Think of it like this: the state table is good for "about what does sales tax look like in this state?" It is not designed to answer "what exact rate applies to this specific street address today?" Those are different questions.

Five States Have No Statewide General Sales Tax

In the January 2026 comparative data, the five states without a statewide general sales tax are Alaska, Delaware, Montana, New Hampshire, and Oregon. Alaska is different from the others because local jurisdictions can impose local sales taxes. And even in a state without a general statewide sales tax, that does not mean every possible tax or fee disappears.

Again, use this calculator for the transaction math rather than assuming one state label tells you everything about a purchase.

Sales Tax Is Not the Same as Income Tax

Sales tax is generally connected to a purchase. Income tax is connected to income. Property tax is connected to property. These are different tax systems. So if someone tells you "my state has no income tax," that does not automatically mean "my state has no sales tax." And the opposite can also be true.

If your question is about federal income tax rather than a purchase, use the Income Tax Calculator. And if the math problem in front of you is actually about a restaurant tip rather than sales tax, the Tip Calculator handles that separate calculation.

What If My Receipt Doesn't Match the Calculator?

Start with the numbers. Check: did you enter the correct taxable subtotal? Did you enter the exact rate? Was part of the purchase exempt? Was there a discount? Were there multiple tax rates? Was shipping or another charge included? Did the location add local tax? Was the rate rounded differently? Is the receipt showing more than one tax line?

A few cents of difference can also come from how individual items and tax amounts are rounded. If the difference is meaningful, compare the receipt with the seller's explanation and the applicable state or local tax guidance. The calculator tells you whether the arithmetic works under the numbers you entered. It cannot determine whether the merchant applied every tax law correctly.

The Three Sales Tax Calculations Side by Side

What Should You Leave This Page Knowing?

You do not need to become a tax expert. Remember three things.

If you know price + rate, use Find After-Tax Price. If you know before-tax price + final total, use Find Tax Rate. If you know final total + rate, use Find Before-Tax Price.

Then remember: your state rate may not be the whole rate, your state average is not necessarily your exact local rate, not every product follows identical tax rules, and reverse sales tax requires division, not simply subtracting the percentage from the final total.

Once those four things make sense, sales-tax math gets a whole lot easier.

Real Questions People Ask About Sales Tax

Sources & Methodology

State-rate and population-weighted average local-rate figures are based on published January 1, 2026 comparative data. Actual city, county, special-district, address-level, and product-specific rates may differ. The 2026 comparison reports 45 statewide general sales taxes and local sales taxes in many states, with substantial local variation.

Sources

• Tax Foundation, State and Local Sales Tax Rates, 2026
• State revenue department resources for transaction-specific rates
• Streamlined Sales Tax resources where appropriate
• U.S. Supreme Court, South Dakota v. Wayfair, for the online-sales historical/legal context

Last reviewed: August 2026