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Sales Tax Calculator

Add sales tax to a price, or take it back out of a total that already includes it. The sales tax calculator shows the net price, the tax, and the total side by side.

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Calculation

Before tax when adding, tax-inclusive when taking out

Sales tax
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How to use the Sales Tax Calculator

  1. Choose Add tax to a price or Take tax out of a total.
  2. Enter the Price and the Tax rate, and change the currency symbol if you like.
  3. Press Calculate. The tax amount appears first, with the net price and the total.

How it works

adding:   tax = net × rate,   gross = net × (1 + rate)
removing: net = gross ÷ (1 + rate),   tax = gross − net

The rate is a decimal: 8.25% is 0.0825. Removing tax divides; it is not the same as taking 8.25% off the total.

Examples

  • $80 at 8.25%: tax $6.60, total $86.60.
  • A $108.25 receipt at 8.25% tax: net price $100.00, tax $8.25.

A common mistake when removing tax

Taking 8.25% off $108.25 gives $99.32, not $100. The tax was calculated on the net price, so you have to divide by 1.0825 to reverse it. The Take tax out of a total tab does this for you.

Limitations

  • You enter the rate. Local rates change and some items are taxed differently.
  • Rounding is done once on the total. Stores that round per item can differ by a cent.

Sources and method review

The arithmetic applies one rate that you enter; it does not determine taxability or fetch current local rates. California's tax authority explains why sales and use tax can vary by location. That source is a California example, not a rule for every jurisdiction. Check your own tax authority and the taxable status of the goods or service before using a rate.

Technical content review: 27 October 2026. The documented method and assumptions were compared with the calculator code and the cited source. This is not a review by a licensed financial or tax adviser.

Frequently asked questions

How do I calculate sales tax?

Multiply the price by the tax rate as a decimal. $80 × 0.0825 = $6.60.

How do I find the price before tax?

Divide the total by 1 plus the rate. $108.25 ÷ 1.0825 = $100.

Does this work for VAT?

Yes. VAT and GST use the same math. Enter your country's rate.

Often used together with Sales Tax Calculator.