Ask what sales tax is and the answer is a multiplication: price times rate. Ask why your receipt reads 8.875% in one borough and 7% a state over, why the online order that skipped tax in 2017 collects it now, and why groceries escape the register in most states but not all — and you're into a system where 45 states and thousands of local governments each set rates and argue about what counts as taxable. Here's the map.
Tax = price × rate; total = price + tax. A $250 purchase at NYC's 8.875% adds $22.19, for $272.19 at the register. Unlike a VAT, which taxes each stage of production, US sales tax applies once, at the final sale to the consumer, collected by the seller and forwarded to the state.
The rate itself is usually a stack: a state rate, plus a county rate, plus a city or special-district rate, all applied to the same base. That stack is why "the sales tax rate" is never one number in most of the country — it's the rate for a specific address. Run any price and rate through the sales tax calculator to see the total; the percentage calculator handles the reverse check when you're auditing a receipt.
Five states levy no state-level sales tax at all. Everywhere else spans a remarkable range. Per the Tax Foundation's 2026 averages, the top of the combined-rate table looks like this:
| State | State rate | Avg combined (2026) | Why it's high or zero |
|---|---|---|---|
| Louisiana | 4.45% | 10.11% | Highest combined average; home-rule parishes stack their own rates |
| Tennessee | 7.00% | 9.61% | Near-top state rate plus high local rates; no income tax on wages |
| Washington | 6.50% | 9.51% | No income tax; sales and property carry the load |
| California | 7.25% | ~9.0% | Highest state-level rate in the US; some cities exceed 10.25% |
| Delaware / Montana / New Hampshire / Oregon | 0% | 0% | No state or local sales tax |
| Alaska | 0% | ~1.8% | No state tax, but localities may levy their own |
Arkansas rounds out 2026's top five. Notice the pattern at the top: states that don't tax income tend to tax purchases harder. There's no free lunch — the revenue comes from somewhere, and in Tennessee and Washington it comes from the cash register.
Local add-ons. Thirty-eight states let counties, cities, and special districts — transit, stadium, fire — levy their own sales taxes on top of the state rate, producing thousands of distinct combinations. The spreads are real: a 2-point difference on a $1,000 appliance is $20 for crossing a county line. Combined averages weight local rates by where spending happens, so a specific address can sit above or below the state's average — the exact number is the rate at the sale's jurisdiction, which state revenue lookups give by address.
Blame — or thank — South Dakota v. Wayfair, the Supreme Court's 2018 decision. Before it, a state could generally force collection only from sellers with a physical presence there, which is why early e-commerce felt tax-free. Wayfair allowed states to impose economic nexus: once a remote seller crosses a threshold into the state — commonly $100,000 in annual sales or 200 transactions — the seller must collect even with no storefront. Two follow-on effects worth knowing:
Yes, probably, at least technically. Use tax is sales tax's shadow: when a seller doesn't collect, the buyer owes the equivalent rate directly to their own state, traditionally declared on the state income tax return. The rule predates the internet — it existed for catalog sales — and almost nobody paid it then either. It still applies to untaxed out-of-state purchases, and states audit businesses for it far more aggressively than individuals. Buying equipment for a business from a vendor that doesn't collect? Budget the use tax rather than hoping.
The rate is half the system; the base is the other half, and it moves more:
One more wrinkle: most states run sales-tax holidays, most famously back-to-school weekends in August exempting clothing, school supplies, and sometimes computers below price caps. During those windows the register applies the exempt rate automatically.
Enter a price and any state — or your own exact rate — and get the tax and total. Add tax backwards from a receipt total, too.
Sales Tax Calculator →Sales tax is a local decision wearing a national uniform: one multiplication at the register, but a rate that stacks state on county on city and a base that each state defines for itself. Compare rates by combined average — Louisiana's 10.11% tops 2026, four states sit at zero — expect tax on online orders unless the seller is small, and treat use tax as real if you buy for a business. The sales tax calculator does the register math, the income tax calculator covers the tax that comes out of pay instead of purchases, and the percentage calculator handles the rate-checking by hand.
By average combined state and local rate, Louisiana leads the country at 10.11 percent in 2026, followed by Tennessee at 9.61 and Washington at 9.51, per the Tax Foundation. California holds a different record: its 7.25 percent state-level rate is the highest state rate in the country, even though its combined average lands near 9 percent because local add-ons are modest.
Four states levy none at any level: Delaware, Montana, New Hampshire, and Oregon. Alaska has no statewide sales tax either, but it allows local sales taxes, so parts of Alaska charge 3 to 7 percent and the statewide average sits near 2 percent. No-sales-tax states usually make the money up elsewhere — income taxes, property taxes, or gross-receipts taxes on businesses.
Since the Supreme Court's 2018 South Dakota v. Wayfair ruling, a state can require out-of-state sellers to collect once they cross an economic nexus threshold — commonly 100,000 dollars in annual sales or 200 transactions into that state. Big retailers and marketplaces like Amazon, eBay, and Etsy collect everywhere. A small seller below the threshold in your state may legally not collect, which is where use tax officially becomes your responsibility.
Almost always after a store discount or coupon, because the taxable price is what you actually paid the seller. Mail-in rebates are the main exception — tax is usually charged on the pre-rebate amount, since the manufacturer, not the seller, refunds the difference. Shipping is its own patchwork: taxable in New York and Texas when the item is taxable, exempt in California when separately stated on the invoice.