VAT & Sales Tax Calculator
Add tax to a net price or extract tax from a gross price — works in both directions.
Formula
gross = net × (1 + rate) · net = gross / (1 + rate)
Tips
- To remove 20% tax you divide by 1.2 — you do not subtract 20%. Subtracting gives the wrong answer.
- Switch the mode selector to work backwards from a receipt total.
Frequently asked questions
Why can I not just subtract the tax percentage?
The tax was calculated on the net amount, not the gross. Subtracting 20% of the gross removes too much. Dividing by 1.20 reverses the original operation correctly.