How US sales tax works
Unlike VAT, US sales tax is added at checkout, on top of the displayed price — a $50 item with an 8% sales tax rate rings up at $54.00, not $50.00. There's no single national sales tax rate; it's set by state, and often layered with additional county and city rates on top, so the effective rate varies a lot depending on where a purchase is made.
Calculating sales tax
Sales Tax = Price Before Tax × (Tax Rate ÷ 100) Total = Price Before Tax + Sales Tax Example: Price Before Tax $100.00, Tax Rate 8.25% Sales Tax = $100.00 × 0.0825 = $8.25 Total = $100.00 + $8.25 = $108.25 Frequently asked questions
How do I calculate sales tax on a purchase?
Multiply the price before tax by the sales tax rate as a decimal to get the sales tax amount, then add that to the price for the total. A $100.00 price at an 8.25% tax rate gives $8.25 in sales tax and a $108.25 total.
Is sales tax the same everywhere in the US?
No. There's no single national sales tax rate — it's set at the state level, and many states allow counties and cities to add their own rates on top, so the effective rate can vary significantly even within the same state.
What's the difference between this and the VAT Calculator?
The math is the same, but the tax works differently in practice. US sales tax is added at checkout, on top of the displayed price. VAT, used in the UK, EU, and elsewhere, is typically already included in the displayed price. Use the VAT Calculator for VAT-based pricing.