How Sales Tax & VAT Work (with Examples)
Sales tax (or VAT) is added on top of a price, but rules differ by country on whether the displayed price already includes it. Knowing how to add and remove it avoids surprises at checkout and in bookkeeping.
Tax-exclusive vs tax-inclusive
In the US, prices are usually shown without sales tax, which is added at the till. In much of Europe, the shelf price already includes VAT. Same maths, different starting point.
Adding and removing tax
To add tax: multiply the net price by (1 + rate). A $50 item at 8% becomes $50 × 1.08 = $54. To back the tax out of a gross price: divide by (1 + rate). A €120 total at 20% VAT is €120 ÷ 1.20 = €100 net, so €20 is tax.
The Sales Tax Calculator does both directions instantly.
Tax vs discounts vs tips
Order matters: discounts usually apply before tax, and tips are typically figured on the pre-tax amount. The Discount Calculator and Tip Calculator pair with the sales-tax tool to get a true final price.
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Last updated: July 6, 2026