Which states have no sales tax?

Delaware, Montana, New Hampshire, and Oregon charge no state sales tax. Alaska has no state sales tax either, though some local jurisdictions there do levy their own.

Why does sales tax vary within the same state?

Most states allow counties and cities to add their own local sales tax on top of the state rate, so the combined rate can differ significantly between two cities in the same state.

Is sales tax charged on online purchases?

Generally yes — since a 2018 Supreme Court ruling (South Dakota v. Wayfair), most states require online retailers to collect sales tax based on the buyer's location, even if the seller has no physical presence there.

Sales Tax Calculator

Estimate sales tax on a purchase using average combined state and local rates.

Price before tax

State

Total price (with tax)$109

Sales tax amount$9

Combined tax rate used8.7%

Sales tax in the US isn't a single national rate — it's set at the state level, and many states also allow cities and counties to add local sales tax on top, so the effective rate can vary block by block. This calculator uses average combined state-plus-local rates to give you a quick estimate of what you'll actually pay at checkout, and flags the five states that charge no state sales tax at all.

Frequently asked questions

This calculator provides an estimate for general informational purposes only and is not tax or financial advice. Actual results may vary based on deductions, credits, benefits, and local tax rules. Consult a licensed tax professional or financial advisor for guidance specific to your situation.