How to Calculate Sales Tax by State: Complete US Guide for 2026
To calculate sales tax in the US, multiply the taxable purchase price by the combined sales tax rate for the location where the sale is subject to tax. The combined rate can include state, county, city, and other local sales taxes. For example, a $100 taxable purchase with an 8% combined sales tax rate adds $8 in tax, making the total $108.
Sales tax is more complicated than simply looking up a state percentage. Rates can vary by location, the type of product or service being purchased, and whether the transaction is subject to special local taxes.
This guide explains how to calculate sales tax by state, how to find the correct rate, how to calculate tax from a tax-inclusive price, and how to use a sales tax calculator for a quick estimate.
Calculate Sales Tax Instantly
Use our sales tax calculator to calculate sales tax, find the total purchase price, or work backward from a tax-inclusive amount.
Open Sales Tax Calculator →How to Calculate Sales Tax
The basic sales tax calculation is simple:
Sales Tax = Taxable Price × Sales Tax Rate
Then calculate the final purchase price:
Total Price = Taxable Price + Sales Tax
For example, if an item costs $250 and the applicable combined sales tax rate is 7.5%:
| Calculation | Amount |
|---|---|
| Purchase price | $250.00 |
| Sales tax rate | 7.5% |
| Sales tax | $18.75 |
| Total price | $268.75 |
The calculation is:
$250 × 0.075 = $18.75
So the customer pays $268.75 in total.
What Is the US Sales Tax Rate?
There is no single sales tax rate for the entire United States.
Sales tax is primarily imposed at the state and local level. Some states have a statewide sales tax, while others do not impose a general statewide sales tax at all.
Local governments can also add their own taxes. As a result, two purchases made in different cities within the same state can have different combined sales tax rates.
This is why a state sales tax calculator should not be based only on the state name. The customer's exact location can matter.
State Sales Tax vs. Local Sales Tax
The rate shown on a receipt can represent several separate taxes combined into one total percentage.
A typical combined sales tax rate can include:
- State sales tax charged by the state government
- County sales tax imposed by a county or similar local authority
- City sales tax imposed by a municipality
- Special district taxes applied to certain locations or transactions
For example, imagine a location has the following rates:
| Tax Component | Rate |
|---|---|
| State sales tax | 5.00% |
| County sales tax | 1.50% |
| City sales tax | 1.00% |
| Combined sales tax | 7.50% |
A $400 taxable purchase at this location would therefore generate $30 in sales tax.
$400 × 7.5% = $30
The final price would be $430.
Sales Tax by State: Which States Have No Statewide Sales Tax?
One of the most common sales tax questions is which states do not have a general statewide sales tax.
Five states are generally recognized as having no statewide general sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon.
However, this does not mean that every purchase in these states is completely free of taxes or fees. Alaska, for example, allows local governments to impose sales taxes, while other states can impose different taxes on specific goods or transactions.
| State | General Statewide Sales Tax | Important Note |
|---|---|---|
| Alaska | None | Local sales taxes can apply |
| Delaware | None | No general state sales tax |
| Montana | None | Some local or resort taxes may apply |
| New Hampshire | None | No general statewide sales tax |
| Oregon | None | No general statewide sales tax |
Because local and special taxes can still exist, shoppers should check the actual location and transaction rather than assuming that a state with no general sales tax means every purchase has a 0% tax rate.
How to Calculate Sales Tax by State
To calculate sales tax accurately, follow these steps.
1. Find the Taxable Purchase Price
Start with the amount subject to sales tax.
If an item costs $800 and the entire purchase is taxable, the taxable amount is $800.
If only part of a transaction is taxable, calculate the tax using the taxable portion rather than the entire invoice.
2. Find the Correct Sales Tax Rate
Identify the applicable state and local sales tax rate for the transaction.
This may require the customer's ZIP code, city, county, or exact delivery location, particularly for online purchases.
3. Convert the Percentage to a Decimal
Divide the percentage by 100.
| Sales Tax Rate | Decimal |
|---|---|
| 4% | 0.04 |
| 5% | 0.05 |
| 6.5% | 0.065 |
| 7.25% | 0.0725 |
| 8.875% | 0.08875 |
4. Multiply the Price by the Rate
Multiply the taxable purchase price by the decimal sales tax rate.
For a $600 purchase at 8.25%:
$600 × 0.0825 = $49.50
5. Add the Tax to the Purchase Price
The final amount is:
$600 + $49.50 = $649.50
Therefore, the customer pays $49.50 in sales tax and $649.50 including tax.
How to Calculate Sales Tax on a $100 Purchase
A $100 purchase provides an easy way to understand how different sales tax rates affect the final price.
| Sales Tax Rate | Sales Tax on $100 | Total Price |
|---|---|---|
| 4% | $4.00 | $104.00 |
| 5% | $5.00 | $105.00 |
| 6% | $6.00 | $106.00 |
| 7% | $7.00 | $107.00 |
| 8% | $8.00 | $108.00 |
| 9% | $9.00 | $109.00 |
| 10% | $10.00 | $110.00 |
This makes the calculation easy to understand, but real purchases can be more complicated because the applicable rate may include multiple state and local components.
How Sales Tax Works for Online Purchases
Online sales tax can be more complicated than buying an item from a local store.
For many online purchases, the seller may need to collect sales tax based on the destination of the order. This is commonly referred to as destination-based sales tax.
The important point is that the tax rate may depend on where the buyer receives the product, not simply where the online business is located.
For example, an online customer ordering a $500 taxable item may see a different sales tax amount depending on the delivery address.
Why Your ZIP Code Can Change the Sales Tax
ZIP codes can help identify the general tax jurisdiction, but they do not always provide enough information to determine the exact applicable rate.
A single ZIP code can sometimes cover multiple tax jurisdictions. For business transactions, the exact address may therefore be more reliable than relying on a ZIP code alone.
This is one reason an online US sales tax calculator should be treated as an estimate unless the underlying rate data is current and location-specific.
How to Calculate Sales Tax Backwards
Sometimes the sales receipt gives the total price including sales tax, but the original price and tax amount are not shown separately.
In that situation, the calculation works differently.
The formula for finding the pre-tax price is:
Pre-Tax Price = Tax-Inclusive Price ÷ (1 + Sales Tax Rate)
For example, suppose a purchase costs $108 including 8% sales tax.
$108 ÷ 1.08 = $100
The original taxable price was $100.
The sales tax was therefore:
$108 − $100 = $8
This is commonly called reverse sales tax, backwards sales tax calculation, or a take-off-sales-tax calculation.
Calculate Sales Tax Backwards
Use our sales tax calculator to work backward from a tax-inclusive price and estimate the original price and sales tax amount.
Open Sales Tax Calculator →Reverse Sales Tax Example
Consider a purchase with a final price of $1,080, including 8% sales tax.
| Calculation | Amount |
|---|---|
| Price including tax | $1,080.00 |
| Sales tax rate | 8% |
| Price before tax | $1,000.00 |
| Sales tax | $80.00 |
The calculation is:
$1,080 ÷ 1.08 = $1,000
Then:
$1,080 − $1,000 = $80
This method is more accurate than simply subtracting 8% from $1,080. Sales tax is calculated as a percentage of the pre-tax price, not the final tax-inclusive price.
Sales Tax Calculation Examples by Purchase Price
The following examples show how the same sales tax rate affects different purchase amounts.
| Purchase Price | Sales Tax Rate | Sales Tax | Total |
|---|---|---|---|
| $50 | 7% | $3.50 | $53.50 |
| $100 | 7% | $7.00 | $107.00 |
| $250 | 7% | $17.50 | $267.50 |
| $500 | 7% | $35.00 | $535.00 |
| $1,000 | 7% | $70.00 | $1,070.00 |
Which Purchases Are Subject to Sales Tax?
Not every purchase is necessarily taxed at the standard sales tax rate.
Whether tax applies depends on the state, local jurisdiction, product or service, and specific exemption rules.
Common taxable purchases can include many physical goods such as:
- Clothing and accessories
- Furniture
- Electronics
- Appliances
- Household goods
- Vehicles and certain vehicle-related purchases
Some states also tax selected services, digital products, prepared food, lodging, or other transactions.
On the other hand, certain groceries, prescription medicines, medical products, nonprofit purchases, or business-related transactions may qualify for exemptions depending on state law.
Why the Product Matters
Two items purchased from the same store can sometimes receive different tax treatment.
For example, a state may apply its standard sales tax to one type of product while exempting or applying a reduced rate to another.
Always verify the applicable state rules when calculating tax for business, accounting, or compliance purposes.
Sales Tax Holidays and Special Tax Rates
Some states temporarily change sales tax treatment during specific periods.
These events are commonly known as sales tax holidays. Eligible products may receive a temporary exemption or reduced tax treatment during the specified period.
Special rates can also apply to certain categories of goods or services.
That means a standard state sales tax rate may not always produce the correct result for a specific purchase.
Sales Tax vs. Use Tax
Sales tax and use tax are closely related, but they are not exactly the same.
Sales tax is generally collected by a seller on a taxable sale.
Use tax can apply when taxable goods or services are purchased without the appropriate sales tax being collected and the item is then used in a state that imposes use tax.
This can become relevant for purchases made from out-of-state sellers or online retailers.
Consumers and businesses should follow their state's rules rather than assuming that no sales tax on a receipt means no tax obligation exists.
Is There a Federal Sales Tax in the United States?
The United States does not have a general federal retail sales tax like the nationwide VAT systems used in many other countries.
Retail sales taxes in the US are primarily imposed by states and local governments.
This is why searching for an IRS sales tax calculator can sometimes be confusing. The IRS does provide federal tax guidance and has rules involving sales tax in certain contexts, but ordinary retail sales tax is generally a state and local matter rather than a single federal sales tax.
For state and local sales tax calculations, the relevant state and local tax authorities are generally more appropriate sources for current rates and rules.
How to Calculate Sales Tax for a Business
Businesses that collect sales tax need to do more than calculate the tax on a single transaction.
They may need to identify the correct tax jurisdiction, determine whether the product is taxable, collect the appropriate amount, maintain transaction records, and remit the tax to the relevant authority.
For a simple taxable transaction, the calculation remains:
Taxable Sales Amount × Applicable Combined Rate = Sales Tax Collected
For example, if taxable sales total $25,000 and the applicable combined rate is 8.25%:
$25,000 × 0.0825 = $2,062.50
The business would collect $2,062.50 in sales tax on those taxable sales, assuming the entire amount is subject to that rate.
How to Find the Correct State Sales Tax Rate
For a quick consumer estimate, a sales tax calculator can provide a useful starting point.
For accurate business compliance, however, use current information from the relevant state and local tax authority.
When checking a rate, consider:
- The state where the transaction is taxable
- The city or county involved
- The delivery or transaction address
- The type of product or service
- Any applicable exemptions
- Temporary sales tax changes or holidays
- Special district taxes
Rates can change over time, so an old sales tax table should not be assumed to be accurate for a current transaction.
How to Calculate Sales Tax on a Large Purchase
Sales tax becomes especially important when buying an expensive item such as a vehicle, appliance, computer, or furniture set.
A small difference in the tax rate can make a noticeable difference in the final price.
For example, consider a $25,000 taxable purchase:
| Sales Tax Rate | Sales Tax | Total Price |
|---|---|---|
| 5% | $1,250 | $26,250 |
| 6% | $1,500 | $26,500 |
| 7% | $1,750 | $26,750 |
| 8% | $2,000 | $27,000 |
| 9% | $2,250 | $27,250 |
| 10% | $2,500 | $27,500 |
Before making a large purchase, checking the applicable local rate can therefore help avoid an unexpected difference between the advertised price and the amount actually paid.
How to Calculate Sales Tax From a Total Price
If the advertised or receipt price already includes sales tax, use a reverse sales tax calculation instead of multiplying the total by the tax rate.
The formula is:
Original Price = Total Price ÷ (1 + Tax Rate)
Then calculate the tax:
Sales Tax = Total Price − Original Price
For example, suppose the final price is $540 and the applicable tax rate is 8%.
$540 ÷ 1.08 = $500
The pre-tax price is $500 and the sales tax is $40.
$540 − $500 = $40
This method is useful when checking receipts, calculating the tax portion of a tax-inclusive price, or determining the original selling price from a final amount.
How to Calculate Sales Tax on a Discounted Item
Sales tax is generally calculated after applying a qualifying discount to the taxable selling price.
Suppose an item has a regular price of $800 and receives a $100 discount. The taxable selling price is $700, assuming the discount reduces the taxable amount under the applicable rules.
At a 7% sales tax rate:
$700 × 0.07 = $49
The final amount would be:
$700 + $49 = $749
Discounts, coupons, rebates, and promotional offers can have different tax treatment depending on the state and type of discount, so businesses should verify the applicable rules.
Sales Tax on Shipping and Delivery Charges
Shipping charges can also affect the taxable amount.
Some states include certain delivery or shipping charges in the taxable sales price, while others provide different treatment depending on the transaction.
For example, a $100 product with a $10 shipping charge may not have the same taxable amount in every state.
This is another reason why simply entering a product price into a sales tax rate calculator may not always produce the exact amount charged on a real transaction.
Common Sales Tax Calculation Mistakes
Most sales tax mistakes are not caused by difficult mathematics. They usually happen because the wrong rate or taxable amount is used.
Using Only the State Rate
A state may allow counties, cities, or special districts to impose additional sales taxes. Using only the statewide rate can therefore underestimate the final tax.
Using the Seller's Location Automatically
For many transactions, especially online sales, the relevant tax jurisdiction can depend on where the customer receives the goods. Do not automatically assume that the seller's location determines the rate.
Calculating Tax on the Tax-Inclusive Price
If the final amount already includes sales tax, multiplying that final amount by the tax rate will overstate the tax.
Use the reverse sales tax formula instead.
Ignoring Product-Specific Rules
Not every product or service receives the same tax treatment. Exemptions, reduced rates, and special rules can apply.
Using an Outdated Rate
Sales tax rates can change. Always verify the current rate when the calculation is being used for an actual transaction or business filing.
Sales Tax Calculator: What Information Do You Need?
A basic sales tax calculator normally needs just two main pieces of information:
- Purchase price
- Sales tax rate
For a more detailed estimate, you may also need the state, city, county, ZIP code, product type, and whether the displayed price already includes tax.
Once the correct inputs are available, the calculation takes only a few seconds.
Calculate Sales Tax by State
Enter your purchase amount and applicable sales tax rate to calculate the tax amount and final price, or work backward from a tax-inclusive total.
Open Sales Tax Calculator →When Should You Use a Sales Tax Calculator?
A sales tax calculator is useful whenever the tax is not already clearly shown in the advertised price.
Common situations include:
- Comparing prices between different states
- Estimating the final cost of an online purchase
- Checking a store receipt
- Calculating tax on a large purchase
- Working backward from a tax-inclusive price
- Estimating sales tax collected by a business
- Planning the total budget for a purchase
Sales Tax Calculation: Quick Reference
| What You Know | Formula to Use |
|---|---|
| Pre-tax price and tax rate | Sales Tax = Price × Tax Rate |
| Pre-tax price and tax rate | Total = Price × (1 + Tax Rate) |
| Tax-inclusive price and tax rate | Pre-Tax Price = Total ÷ (1 + Tax Rate) |
| Tax-inclusive price and tax rate | Sales Tax = Total − Pre-Tax Price |
Get an Accurate Sales Tax Estimate
The basic sales tax formula is easy. Finding the correct rate is usually the harder part.
For a quick estimate, enter the purchase price and applicable rate into our calculator. For business tax compliance, verify the current rules and rate with the appropriate state or local tax authority.
Remember that sales tax can vary by location and product. A calculator can perform the mathematics accurately, but the result is only as accurate as the rate and taxable amount entered.
Calculate Your Sales Tax
Quickly calculate sales tax, total purchase price, or the pre-tax amount from a tax-inclusive price.
Open Sales Tax Calculator →Additional Resources
For official information about federal tax matters involving sales tax, consult the IRS. For actual state and local sales tax rates, check the relevant state or local tax authority.