About this tool
Add sales tax (or VAT, GST) to a pre-tax price.
Formula
Tax = Price · Rate. Total = Price + Tax.
Worked example
$99.99 at 8.25% → Tax = $8.25. Total = $108.24.
Notes
For tax-inclusive prices, divide by (1 + rate) to back out the pre-tax amount. E.g. $108.25 / 1.0825 ≈ $99.99.