Sales Tax Calculator
Calculate sales tax quickly with our Sales Tax Calculator. Enter the price and tax rate to see the tax amount and final price. Perfect for shopping, budgeting, business accounting, or understanding the true cost of purchases. The calculator works both ways - add tax to a pre-tax price or remove tax from a total to find the original price. All calculations happen instantly in your browser with no data storage.
How it works: Enter the price and tax rate to calculate sales tax. Choose "Add Sales Tax" to find the final price, or "Remove Sales Tax" to find the pre-tax price from a total that includes tax.
What Is a Sales Tax Calculator?
A sales tax calculator computes the tax amount and final price when you know the pre-tax price and the applicable rate — or reverses the math to strip tax out of a tax-inclusive total. Sales tax in the US is administered at the state and local level, so rates vary from 0% (Oregon, Montana, New Hampshire, Delaware, Alaska) to over 10% in some cities when state and local rates combine.
Retailers, freelancers collecting sales tax, and consumers comparing prices across state lines all use a sales tax calculator to avoid manual arithmetic errors on checkout totals, invoices, and price quotes.
How to Use This Sales Tax Calculator
- Enter the pre-tax price of the item or service.
- Enter the sales tax rate as a percentage (e.g., 8.5 for 8.5%).
- Click Calculate to see the tax amount and final price.
- To reverse-calculate, toggle to Remove Tax mode, enter the tax-inclusive price, and get the pre-tax amount.
Look up your combined state + local rate on your state's department of revenue website or use the rate shown on your last receipt for the same purchase location.
Worked Example: $349 Electronics Purchase at 9.25%
Ryan buys a Bluetooth speaker listed at $349.00 in Nashville, TN, where the combined state + local rate is 9.25%.
- Tax amount: $349.00 × 0.0925 = $32.28
- Final price: $349.00 + $32.28 = $381.28
Reverse example: If Ryan sees a receipt total of $381.28 and wants to know the pre-tax price: $381.28 ÷ 1.0925 = $349.00. The formula is always: Pre-tax price = Tax-inclusive price ÷ (1 + tax rate).
Comparing across states: the same $349 speaker in Portland, OR (0% sales tax) costs exactly $349.00. Ryan pays $32.28 more just for buying it in Tennessee.
Sales Tax Rates by State
| State | State Base Rate | Avg. Combined Rate | Notes |
|---|---|---|---|
| California | 7.25% | 8.68% | Highest state base rate |
| Tennessee | 7.00% | 9.55% | Highest combined average |
| Texas | 6.25% | 8.20% | No state income tax |
| New York | 4.00% | 8.52% | NYC adds 4.5% local |
| Florida | 6.00% | 7.01% | No state income tax |
| Colorado | 2.90% | 7.77% | Lowest state base rate |
| Oregon / Montana / NH / DE | 0.00% | 0.00% | No sales tax |
Sales Tax Key Concepts
Origin vs. destination sourcing: For in-person purchases, you pay the rate where the sale occurs. For online purchases, most states now require sellers to collect tax based on the buyer's shipping address (destination sourcing) following the 2018 South Dakota v. Wayfair Supreme Court ruling.
Nexus: A seller must collect sales tax in a state where they have nexus — a physical presence (store, warehouse, employees) or economic nexus (exceeding sales thresholds, typically $100,000 or 200 transactions in a state per year).
Exempt items: Most states exempt groceries, prescription drugs, and some clothing from sales tax entirely. A few states tax digital downloads and SaaS products at different rates. Always confirm your state's exemption rules for the specific product category.
Tips for Sellers and Shoppers
- Shoppers: When comparing prices across retailers, always add estimated sales tax before deciding. A lower sticker price in a high-tax state may cost more out-of-pocket than a higher price in a low-tax state.
- Freelancers and service businesses: Check if your state taxes services — most don't, but states like Hawaii, New Mexico, and South Dakota broadly tax most services.
- E-commerce sellers: Use a tax compliance tool (TaxJar, Avalara) once you hit economic nexus thresholds in multiple states. Manual rate lookups don't scale.
- Big-ticket purchases: On a $30,000 car, a 1% difference in tax rate equals $300. Worth checking if your state taxes vehicle purchases separately from general merchandise.
- Tax-free weekends: Many states offer annual sales tax holidays on back-to-school items, hurricane preparedness supplies, or Energy Star appliances. Plan large purchases around these windows.
Frequently Asked Questions About Sales Tax
How do I calculate sales tax on a price?
Multiply the pre-tax price by the tax rate as a decimal: Tax = Price × Rate. For a $200 item at 8%: $200 × 0.08 = $16 tax, $216 total.
How do I remove sales tax from a total?
Divide the tax-inclusive price by (1 + tax rate): Pre-tax = Total ÷ 1.08 for an 8% rate. Example: $216 ÷ 1.08 = $200 pre-tax.
Which states have no sales tax?
Oregon, Montana, New Hampshire, Delaware, and Alaska have no statewide sales tax. Alaska allows local sales taxes, so some municipalities do charge tax.
Are online purchases subject to sales tax?
Yes, in most cases. Since the 2018 Wayfair decision, large online sellers must collect sales tax based on the buyer's state. Smaller sellers below economic nexus thresholds may not collect, but buyers technically owe use tax on those purchases.
Is sales tax the same as VAT?
No. Sales tax is collected only at the final point of sale to the consumer. VAT (used in Europe and most countries) is collected at each stage of the supply chain and is included in the listed price, so European prices are always tax-inclusive.
What's the difference between state and combined sales tax rates?
The state rate is set by state law. The combined rate adds county and city taxes on top. Always use the combined rate for accurate calculations — in cities like Chicago or Los Angeles, local additions can add 2–3% to the state base rate.
Related Calculators
- Discount Calculator — find the price after a percent-off sale
- Tip Calculator — split a restaurant bill with tax
- VAT Calculator — add or remove VAT for international purchases
- Income Tax Calculator — estimate federal income tax owed