Sales Tax & VAT Calculator
Add tax to a price, or extract the tax already included in a total.
Net (before tax)
$100.00
Tax
$8.00
Gross (with tax)
$108.00
Formula & methodology
Add: gross = net × (1 + rate). Remove: net = gross ÷ (1 + rate); tax = gross − net.
Worked example
- Add 8% to 100 → Tax 8, gross 108
- Remove 8% from 108 → Net 100, tax 8
Frequently asked questions
What is the difference between the two modes?
“Add tax” treats your input as the pre-tax price and adds tax on top. “Remove tax” treats your input as a tax-inclusive total and splits out the tax.
Does it work for VAT and GST?
Yes. VAT, GST, and sales tax are all percentage taxes, so the same math applies — just enter your local rate.
Privacy
All processing happens locally in your browser. Your data is never uploaded.
Disclaimer: This is a general calculator. Real invoices may involve rounding rules, multiple rates, or exemptions specific to your jurisdiction.