Reverse Tax Calculator
Calculate the pre-tax amount (gross) from a total amount including tax, based on a given tax rate. Useful for VAT, sales tax, or GST.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator finds the pre-tax amount when you know the total (including tax) and the tax rate.
- Enter Total Amount – The full price including tax (e.g.,
120.00). - Enter Tax Rate (%) – The percentage tax applied (e.g.,
20for 20%). - Click "Calculate Pre-Tax Amount" – The result shows the original price before tax and the tax portion.
What you get:
- Pre-Tax Amount – The price excluding tax.
- Tax Amount – How much tax was included.
- Formula Explanation – Shows the calculation steps.
Tip: Use any currency – the calculator works with any positive number. Tax rate must be 0 or higher.
Previous Results
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Frequently Asked Questions
It calculates the original price before tax from the total price including tax, given the tax rate.
Enter the total amount including tax and the tax rate percentage, then click 'Calculate Pre-Tax Amount'.
Yes, it is completely free to use with no limitations.
