Reading the result
Sales tax is destination-based in most states, meaning the rate that applies is the rate where the buyer takes delivery, not where the seller is located. That is why an online order and an in-store purchase from the same retailer can carry different tax.
| Situation | Which rate applies |
|---|---|
| In-store purchase | The combined rate at the store's location |
| Delivered or shipped order | In most states, the combined rate at the delivery address |
| Digital goods and services | Varies by state; many tax some digital products and not others |
| Groceries, medicine, clothing | Frequently exempt or taxed at a reduced rate, varying by state |
- Combined rates change frequently as local jurisdictions add or amend district taxes. Verify the current rate for the specific address before relying on it for filing or invoicing.
- Exemptions and reduced rates for categories such as food, prescription medicine and clothing are common and are not modelled here — this calculator applies one rate to the whole amount.
What sales tax is
Sales tax in the United States is levied at the point of sale on the final consumer, and it is imposed by states and by local jurisdictions rather than federally. The rate a shopper pays is therefore a combined rate: a state rate plus whatever the county, city or special district adds on top.
Combined rates vary widely. The Tax Foundation's midyear 2026 rankings put Louisiana highest at 10.13%, followed by Tennessee at 9.61%, Washington at 9.57%, Arkansas at 9.48% and Alabama at 9.46%. Four states levy no state or local general sales tax at all — Delaware, Montana, New Hampshire and Oregon — while Alaska has no statewide tax but does have local ones.
Sales tax differs from a value-added tax in where the tax is collected. Sales tax is collected once, from the final consumer; VAT is collected at each stage of production with credits for tax already paid. The arithmetic on a receipt looks the same, which is why this calculator serves both, but the systems are not equivalent.
How to use the sales tax calculator
- Choose whether the amount you are entering is the pre-tax price or a total that already includes tax.
- Enter the amount.
- Enter the combined sales tax rate that applies at the point of sale — state plus any local rates, not the state rate alone.
- Read the tax, the pre-tax price and the total. All three are shown whichever direction you calculate in.
The formula behind sales tax
Adding tax is a straight multiplication: the tax is the pre-tax price times the rate, and the total is the two added together.
Extracting tax from a tax-inclusive total is where mistakes happen. The total is the pre-tax price times one plus the rate, so recovering the pre-tax price means dividing by one plus the rate. Multiplying the total by the rate overstates the tax, because it applies the rate to the tax as well as to the price.
Common mistakes
- Multiplying a tax-inclusive total by the tax rate to find the tax. Divide by one plus the rate instead; at 7.25% the shortcut overstates the tax by about 7%.
- Using the state rate alone. The rate a shopper pays is the combined state and local rate, which can be several points higher.
- Applying the seller's local rate to a delivered order in a destination-based state.
- Applying one rate to a basket that mixes taxable and exempt items.
- Treating sales tax and VAT as interchangeable. The arithmetic on a single receipt matches, but the systems, registration duties and reclaim rules do not.
الأسئلة الشائعة
How do I calculate sales tax on a price?
Multiply the pre-tax price by the combined rate expressed as a decimal, then add it to the price. On a $100 item at a 7.25% combined rate the tax is $7.25 and the total is $107.25.
How do I work out the tax already included in a total?
Divide the total by one plus the rate to recover the pre-tax price, then subtract. A total of $107.25 at 7.25% gives $107.25 / 1.0725 = $100.00, so the tax is $7.25. Multiplying $107.25 by 0.0725 gives $7.78, which is wrong because it applies the rate to the tax as well.
Which US states have no sales tax?
Delaware, Montana, New Hampshire and Oregon levy no general state or local sales tax. Alaska has no statewide sales tax but many of its local governments do levy one, so a purchase there may still be taxed.
Which state has the highest sales tax?
On the Tax Foundation's midyear 2026 figures, Louisiana has the highest average combined state and local rate at 10.13%, followed by Tennessee at 9.61%, Washington at 9.57%, Arkansas at 9.48% and Alabama at 9.46%.
Is sales tax the same as VAT?
No. Sales tax is charged once, to the final consumer, at the point of sale. VAT is charged at every stage of production and distribution, with businesses reclaiming the tax they have paid on inputs. The tax shown on a consumer receipt is calculated the same way, but the underlying systems and compliance obligations differ.
المراجع
- Tax Foundation. State and Local Sales Tax Rates, Midyear 2026. taxfoundation.org — combined state and local averages, with Louisiana highest at 10.13% and four states levying no general sales tax.
- Tax Foundation. State and Local Sales Tax Rates, 2026. taxfoundation.org.
- Streamlined Sales Tax Governing Board. Streamlined Sales and Use Tax Agreement — sourcing rules for destination-based taxation. streamlinedsalestax.org.
- US Supreme Court. South Dakota v. Wayfair, Inc., 585 U.S. 162 (2018) — economic nexus and the obligation of remote sellers to collect sales tax.