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Sales Tax Calculator: Calculate Sales Tax on Any Purchase

Add a sales tax rate to any purchase price

FinanceBy Numora finance teamReviewed by Numora compliance review board, Certified Public Accountant (CPA)Updated 

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Assumptions
€
%
Total with tax
$108.25

Total after sales tax

On a €100 purchase at 8.25% sales tax, you'll pay $8.25 in tax — for a total of $108.25.

Tax amount$8.25
Pre-tax price$100.00

U.S. sales tax varies by state, county, and city. Check the exact combined rate for the purchase location — online rates often default to billing address.

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⚡ The answer

A sales tax calculator adds a tax rate to a pre-tax price and returns the final amount you'll pay at checkout. The math is a single multiplication and addition, but the rate itself depends on your state, county, city, and in some cases the type of product being sold.

Quick takeaway

This sales tax calculator helps you quickly determine the total cost of a purchase, including the exact sales tax amount, by factoring in both the item's pre-tax price and the applicable sales tax rate. Sales tax rates in the U.S. are complex, varying significantly by state, county, and even city, with some states having no sales tax at all. For online purchases, the rate is typically based on your shipping address. This tool is ideal for budgeting, comparing prices across different locations, or simply verifying the tax on a receipt, ensuring you understand the full financial impact of your purchases.

What is a sales tax?

Use this sales tax calculator to compute the tax amount and the total after-tax price for any purchase. Enter the pre-tax price and your local sales tax rate — we calculate the dollar tax, the after-tax total, and the reverse calculation (back out the pre-tax amount from a tax-inclusive total). Sales tax rates vary by state, county, and city — check your local tax authority for the exact combined rate, since US sales tax is a state and local tax not a federal one.

The formula

Total = Price × (1 + TaxRate ÷ 100)
  • Total — amount paid at checkout
  • Price — pre-tax price of the item(s)
  • TaxRate — combined sales tax rate as a percentage

Source: Standard Sales Tax Calculation Formula.

Worked examples

1A $100 item in New York City

Inputs
price: 100taxRate: 8.875
Walkthrough

At NYC's 8.875% combined rate, a $100 item costs $108.88 at checkout — $8.88 of which is tax. The state takes $4, the city and transit district take the rest.

2A $1,000 purchase in Oregon

Inputs
price: 1000taxRate: 0
Walkthrough

Oregon has no state or local sales tax, so a $1,000 item costs exactly $1,000. This is one reason residents of bordering states make larger purchases in Oregon — though technically you owe use tax to your home state on cross-border buys.

3A $500 appliance in a 8% combined tax area

Inputs
price: 500taxRate: 8
Walkthrough

For a $500 appliance with an 8% combined sales tax rate (e.g., 6.5% state + 1.5% local), the tax amount would be $40.00, making the total purchase price $540.00.

How to use this calculator

  1. Pre-tax price (default: 100)
  2. Sales tax rate (default: 8.25)
  3. Read the result. Use the worked examples below to sanity-check against a known scenario.

Common mistakes and edge cases

Using your state's base rate and forgetting the local addition. New York State is 4%; New York City's combined rate is 8.875%. The gap is $4.88 on a $100 purchase.

Assuming all items taxed at the same rate. Most states tax prepared food, clothing, and medicine differently from general merchandise. An online cart mixing categories may apply different rates per line.

Applying sales tax to the price after a percentage discount. The order matters: tax is almost always calculated on the post-discount price, not the original sticker. If the calculator shows a different number than the receipt, check which base the retailer used.

Frequently asked questions

Why do online retailers charge different tax on the same item?
They charge based on the shipping address, which may fall in a different city, county, or state than the billing address. Retailers also vary in how aggressively they collect — smaller sellers below nexus thresholds aren't required to.
Is sales tax ever applied before a discount?
Almost never. Standard practice is: item price minus discounts = taxable amount. Coupons from the retailer reduce the taxable amount; manufacturer coupons sometimes don't, depending on state.
What's the highest combined sales tax rate in the US?
Combined rates above 10% exist in several cities — Chicago (10.25%), Seattle (10.35%), and parts of Alabama (up to 13.5%). The calculator accepts up to 30% to cover international and edge cases.
How do I find my local sales tax rate?
Most state departments of revenue or taxation provide online lookup tools where you can enter a ZIP code or address to find the exact combined state and local sales tax rate for that location.
What is a 'sales tax holiday'?
A sales tax holiday is a temporary period, usually a few days, during which certain designated items (like school supplies, clothing, or hurricane preparedness items) can be purchased without paying sales tax. These are enacted by individual states.
Are services subject to sales tax?
Generally, sales tax applies to tangible goods, but some states do tax specific services, such as landscaping, car repairs, or digital streaming services. The rules vary significantly by state.
What is the difference between sales tax and VAT?
Sales tax is collected once at the point of sale from the end consumer. Value Added Tax (VAT), common in Europe, is collected at each stage of production and distribution, with businesses typically reclaiming the VAT they paid on inputs, ultimately passing the cost to the final consumer.
Do I pay sales tax on digital goods?
Many states now impose sales tax on digital goods and services, such as e-books, streaming subscriptions, software downloads, and online games. The taxability depends on the specific state's laws.

Sales Tax glossary

Combined rate
State rate plus county, city, and special district rates. The total percentage a retailer must collect.
Use tax
A tax some states charge when you buy something out-of-state and bring it home. Similar rate to sales tax, but the buyer owes it rather than the seller.
Nexus
A business's obligation to collect sales tax in a state, triggered by physical presence or by exceeding a sales threshold (typically $100,000 or 200 transactions).
Sales Tax Holiday
A temporary period during which certain items are exempt from sales tax, often for back-to-school supplies or hurricane preparedness items.
Exemptions
Specific goods or services that are not subject to sales tax, such as most groceries, prescription medications, or certain clothing items in some states.
Origin-based vs. Destination-based Sales Tax
Origin-based states charge sales tax based on the seller's location, while destination-based states charge based on the buyer's (shipping) location. Most states are destination-based for online sales.

How we built this calculator

Methodology

Sales tax in the United States is layered. States set a base rate (0% to about 7%), counties often add 0.25–2%, and cities may add another 1–4%. Your effective rate is the sum. Five states charge no state sales tax at all: Alaska, Delaware, Montana, New Hampshire, and Oregon — though Alaska allows local sales tax.

This calculator was written by Numora finance team and reviewed by Numora compliance review board, Certified Public Accountant (CPA) before publication. Both names link to full bios with verifiable credentials.

Formula source
Standard Sales Tax Calculation Formula
Last reviewed
2026-04-24
Reviewer
Numora compliance review board, Certified Public Accountant (CPA)
Calculation runs
Client-side only
NF
WRITTEN BY
Numora finance team
NC
REVIEWED AND APPROVED BY
Numora compliance review board, Certified Public Accountant (CPA)
In this review:
  • Verified the formula matches Standard Sales Tax Calculation Formula (v1.0).
  • Confirmed the rounding rule applied by the engine: Standard commercial rounding to the nearest cent (two decimal places).
  • Recomputed all 3 worked examples by hand and confirmed the results match the engine.
  • Confirmed all 5 cited sources resolve to current pages on the issuing institution.
  • Validated all 2 test cases pass within the declared tolerance.

Reviewed on 2026-04-24 · Next review: 2027-04-24

See editorial policy

Sources & references

Every numeric assumption traces to a primary source.

  1. Tax Foundation — State and Local Sales Tax Rates (annual)USA
  2. Streamlined Sales Tax Governing BoardUSA
  3. IRS Publication 17: Your Federal Income Tax (Sales Tax Deduction)USA
  4. California Department of Tax and Fee Administration (CDTFA)USA
  5. Wikipedia: Sales Tax in the United StatesINT
  6. Numora Editorial Policy. numora.net/editorial-policy