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Add or Remove VAT from a Price Calculator

Calculate a VAT-inclusive price or extract the pre-VAT amount using a supplied percentage.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

Adding an entered 20% VAT rate to 100 gives 120 gross and 20 VAT. Removing that same rate from 120 gives 100 net and 20 VAT.

Add: gross = net × (1 + rate); remove: net = gross ÷ (1 + rate)

Worked example

Enter these known values and leave the other values blank.

Add or remove VAT
Add VAT
Known price
100 USD
Entered VAT rate
20 %
Price including VAT
120 USD
VAT added
20 USD

Assumptions and limitations

  • The rate is supplied by you. This tool does not determine the applicable jurisdiction, taxable base, exemptions, recoverability or invoice-rounding rules.
  • Add mode treats the known amount as VAT-exclusive; Remove mode treats it as VAT-inclusive. Use nonnegative amounts and rates.
  • One percentage applies to the entire amount. Mixed-rate baskets, special schemes and per-line invoice rounding are outside the model.

Common questions

Why is removing 20% VAT not the same as taking 20% off?

The rate was applied to the pre-VAT base. Divide the gross amount by 1.20 to recover that base; subtracting 20% of gross uses a different denominator.

Does the calculator choose a VAT rate for me?

No. Enter the rate that applies to the transaction after checking the relevant rules.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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