You grab a $100 item, hand over a hundred-dollar bill, and you're short. In the U.S., the number on the shelf almost never includes tax — a quirk that surprises visitors and locals alike. Here's how sales tax actually works, where the money goes, and why your neighbor two towns over pays a different rate.
Need the total fast? The sales tax calculator does it instantly.
What sales tax is
Sales tax is a consumption tax collected by the retailer at the point of sale and passed to the government. It's a major funding source for states and localities — which is exactly why the rate depends so heavily on where you buy.
How rates stack: state + county + city
Your 'combined' rate is built from layers:
| Layer | Set by | Typical range |
|---|---|---|
| State | State legislature | 0%–7.25% |
| County | County government | 0%–3% |
| City/district | Local government | 0%–3%+ |
That's why a city address and a county-only address a few miles apart can pay noticeably different totals on the same product.
What's taxable — and what's often exempt
Most tangible goods are taxable, but exemptions are common and vary by state:
- Groceries: exempt or reduced-rate in many states
- Prescription drugs: usually exempt
- Clothing: exempt in a few states, taxed in most
- Digital goods & services: increasingly taxed
Online and out-of-state purchases
For years, online shopping felt tax-free. That changed with the 2018 Supreme Court decision in South Dakota v. Wayfair, which let states require sellers to collect tax based on the buyer's location once they cross a sales threshold — even with no local storefront. Today most large online retailers collect sales tax automatically.
Use tax: the part people forget
If you buy something untaxed (say, from a small out-of-state seller) and use it in your state, you may technically owe use tax at the same rate. It's widely overlooked by individuals but routinely audited for businesses.
Frequently asked questions
Get an instant estimate with the sales tax calculator.
Why is the total higher than the price tag?
U.S. retailers usually display pre-tax prices. Sales tax is added at checkout, so the total is the sticker price plus your combined local rate.
What's the highest sales tax in the US?
Combined state-and-local rates exceed 10% in parts of several states. Five states have no statewide sales tax at all.
Do I owe sales tax on online purchases?
Usually yes. Since the 2018 Wayfair decision, states can require online sellers to collect sales tax based on your location even without a physical store nearby.