What is the Reverse Tax Calculator?
The reverse tax calculator is a free online tool that helps you work out reverse tax quickly and accurately. It uses the standard formula Net = Gross x 100 / (100 + rate); Tax = Gross - Net and shows the result instantly as you type, along with a full breakdown so you can see exactly how the answer was reached.
How to use this calculator
- Enter the tax-inclusive amount.
- Enter the tax rate.
- See the pre-tax amount and tax portion.
Formula used
Net = Gross x 100 / (100 + rate); Tax = Gross - NetExplanation of each input
- Amount including tax โ the amount including tax used in the calculation.
- Tax rate (%) โ the tax rate used in the calculation.
Understanding your result
- Pre-tax amount โ the calculated pre-tax amount.
- Tax component โ the calculated tax component.
Step-by-step calculation
For the example values 1180 incl. 18%:
- Apply the formula:
Net = Gross x 100 / (100 + rate); Tax = Gross - Net - Substitute the values: 1180 x 100/118
- Result: Net 1000; tax 180
Worked example
| Inputs | 1180 incl. 18% |
|---|---|
| Working | 1180 x 100/118 |
| Result | Net 1000; tax 180 |
Benefits and practical uses
This calculator saves you time and reduces errors when you need reverse tax. It is useful for students, professionals and anyone who wants a fast, reliable answer without manual calculation. Results update instantly, work in your browser and can be copied or shared in one click.
Assumptions and limitations
- Single tax rate.
Frequently asked questions
What is reverse tax?
It extracts the base price and tax from a total that already includes tax - useful for invoices.
Disclaimer: This calculator gives an estimate and is not tax advice. Rates, slabs and eligibility conditions change and vary by individual.