Sales Tax Calculator
Find the total price after tax, the tax amount, or the pre-tax price. Enter your own local combined tax rate — there's no built-in default, since sales tax varies by state, county, and city.
Calculator verified • Last updated: August 2026
Price & Tax Rate
Applies one flat rate to the whole amount — it doesn't split a mixed cart with different rates per item (e.g., taxable goods mixed with tax-exempt groceries).
Don't know your rate offhand? Your state's Department of Revenue publishes current combined rates by ZIP code — or check a recent receipt from a local purchase.
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Quick Reference — Common Local Rates
| Rate | Tax Amount | Total Price |
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How to Calculate Sales Tax
Multiply the pre-tax price by the tax rate to get the tax amount, then add that to the price for your total cost.
Total Price: what you actually pay at checkout.
Price: the pre-tax, listed price.
r: the sales tax rate as a decimal (7% = 0.07).
For a 50-dollar item at a 7% combined rate: 50 × 1.07 = 53.50 dollars total, meaning 3.50 dollars in tax. For a bigger purchase, say a 1,200-dollar television at a 6.5% rate: 1,200 × 1.065 = 1,278 dollars total, 78 dollars of which is tax.
Why This Calculator Has No Default Tax Rate
Unlike VAT or a national consumption tax, US sales tax isn't set at the federal level at all — it's a patchwork of state, county, and city rates that can differ between two addresses just a few blocks apart, and a handful of states charge no state-level sales tax whatsoever. A single default rate would be wrong for the overwhelming majority of users, so this calculator asks for your own combined local rate instead of guessing at one. If you don't know it offhand, your state's Department of Revenue website publishes current rates by ZIP code, and any recent local receipt shows the exact rate that was applied to that purchase.
Origin-Based vs. Destination-Based Sales Tax
Most states use destination-based sourcing, meaning the tax rate applied is based on where the buyer takes possession of the item — relevant for online orders shipped across county or city lines within the same state, where the rate can change based on the delivery address rather than the seller's location. A smaller number of states use origin-based sourcing instead, applying the seller's local rate regardless of where the buyer is. Which system applies affects which combined rate is the correct one to use for a given purchase.
A Brief History of US Sales Tax
Sales tax in the United States is a state-level invention, not a federal one — there is no general federal sales tax. Mississippi adopted the first statewide sales tax in 1930, during the Great Depression, as a way to replace revenue lost when property tax collections collapsed; many other states followed over the following decade. Since then, most states have layered additional county and city sales taxes on top of the state rate, which is why a combined local rate — not a single statewide number — is what actually applies at checkout in most places.
Common Sales Tax Mistakes
Assuming a nearby city or a past purchase's rate still applies is a frequent error — rates can and do change, and even neighboring cities within the same county can have different combined rates due to local voter-approved add-ons (transit, school, or infrastructure measures). Forgetting that some categories are exempt or taxed at a reduced rate in many states — groceries and prescription medication are common examples — can also throw off a manual estimate for a mixed shopping cart. Online purchases are not automatically tax-free either; most states now require sales tax collection on online orders shipped to an address within the state.
Sales Tax Terms You Should Know
Sales Tax — a consumption tax collected by the seller at the point of sale and remitted to the state or local government.
Use Tax — a companion tax owed by the buyer directly (typically self-reported) when a purchase was made without sales tax being collected, such as certain out-of-state or online orders.
Nexus — the legal connection (a physical presence, or in many states now a sales-volume threshold) that requires a seller to collect a given state's sales tax.
Tax-Exempt — a category of goods, services, or buyers not subject to sales tax, such as groceries, prescription drugs, or registered nonprofit organizations in many states.
Rates and exemptions shown or referenced here are for general educational purposes only and are not tax advice. Sales tax rates and rules vary by state, county, and city, and can change during the year — verify your exact current combined rate with your state's Department of Revenue before relying on it for a real transaction or filing.
Frequently Asked Questions
Why doesn't this calculator have a default tax rate?
Sales tax in the US is set at the state level and often layered with additional city and county rates, so the combined rate varies block by block, not just state by state. There is no single national rate to default to — enter the combined local rate for your area.
Where can I find my exact local sales tax rate?
Your state's Department of Revenue (or equivalent taxing authority) publishes current combined state, county, and city sales tax rates by address or ZIP code. A recent receipt from a local purchase also shows the exact rate that was applied.
Does sales tax apply to services as well as goods?
It depends on the state. Most US states tax tangible goods broadly, but taxation of services is inconsistent — some states tax very few services, others tax many. Check your state's specific rules if you're calculating tax on a service rather than a physical product.
Can sales tax rates change during the year?
Yes. State legislatures and local governments can adjust rates, and voter-approved local measures (transit, school, or infrastructure taxes) can add or remove a percentage point at various points in the year. Always verify the current rate rather than relying on a rate you used previously.
Can I work backward from a receipt total to find the pre-tax price?
Yes — switch to the "Find Pre-Tax Price" tab above and enter your receipt's total instead of a pre-tax price. The calculator divides by (1 plus your tax rate) to recover the original pre-tax price and the exact tax amount within that total.