Sales Tax Calculator
Add sales tax to a net price, or extract the net amount and tax from a tax-inclusive total.
How to use it
- Enter the amount Either before or after tax.
- Enter the tax rate Your local sales tax or VAT percentage.
- Read the breakdown See the net, the tax and the gross total.
Examples
| 100 + 8% | 108 total |
|---|---|
| 108 incl. 8% | 100 net |
About this tool
Sales tax, VAT and GST all work the same way mathematically, and this calculator handles them in both directions. Enter a price before tax to see the tax and final total, or start from a tax-inclusive total to recover the original net amount.
That reverse calculation is handy for receipts and invoices where only the gross figure is shown but you need the net price and the tax separately. Enter any rate and the breakdown updates instantly in your browser.
Frequently asked questions
Can it work backwards from a total?
Yes. Tick the "already includes tax" option and it extracts the original net price and the tax portion from a gross figure.
Does it handle VAT and GST?
Yes — any percentage-based sales tax, VAT or GST works. Just enter your local rate.
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Updated June 13, 2026