CalcQuick · Sales tax & VAT
Sales Tax and VAT Calculator: Add or Remove Tax
Choose whether your entered amount excludes or includes tax, then supply the rate that applies to your scenario. The calculator separates the amount before tax, the tax and the total.
Reviewed and updated:Illustrative inputs: replace rates and costs with your own assumptions.
One user-entered rate applied to the full amount. No tax rate lookup, exemptions, stacked taxes or local invoice rounding rules.
01
How to use this calculator
- Enter your values using the units shown.
- Review the result, which updates instantly.
- Check the formula and assumptions before using the number for a decision.
02
Formula and assumptions
Let r = tax percentage ÷ 100. Add tax: tax = net × r and gross = net × (1 + r). Remove included tax: net = gross ÷ (1 + r) and tax = gross − net.
03
Worked example
At an illustrative 10% rate, a net amount of 100 gives tax of 10 and a gross total of 110. Removing the same rate from a gross amount of 110 returns net 100 and tax 10.
CalcQuick
Sources and scope
These references support the formula or category guidance. CalcQuick remains responsible for the calculator implementation.
- Calculating prices inclusive and exclusive of VATHM Revenue & Customs
FAQ
Frequently asked questions
Why can’t I just subtract the tax percentage from the gross price?
The percentage applies to the amount before tax. Recover that base by dividing the gross price by one plus the rate, then subtract the base to find the tax.
Does the tool choose a tax rate for my location?
No. You enter the applicable rate. Language and currency affect labels and formatting, not the legal rate or whether a sale is taxable.
Will the result exactly match an invoice?
It may differ when an invoice rounds each line separately, combines taxes or applies special rules. This calculator applies one rate to the full amount and rounds only the displayed figures.