Tax Percentage Calculator
Calculate a tax percentage
Work out what percentage a tax represents of a base amount: useful for checking the rate applied on an invoice or receipt. You only need the base and the tax amount.
Calculate a tax percentage
Result
Rate on the base
21%
- Tax share of the total
- 17.36%
- Total including tax
- €1,210.00
Formula version: 1.0.0
How to use the tax percentage calculator
- Enter the pre-tax base.
- Enter the tax amount.
- Review the rate on the base and the tax's share of the total.
Tax percentage formula
Rate = tax / base × 100 · Share of total = tax / (base + tax) × 100
The share of the total is always lower than the rate, because the total includes the tax itself.
Tax percentage example
An invoice with a €1,000 base and €210 of tax applies 21%; the tax is 17.36% of the €1,210 total.
Illustrative example with the data shown; not a guaranteed outcome.
Assumptions and limitations
- Both amounts in the same currency.
- Tax is calculated on the base, not the total.
Frequently asked questions
Why isn't 21% VAT 21% of the final price?
Because it's calculated on the base. Relative to the final price, 21% VAT is 17.36%.
Does it work for any tax?
Yes, for any tax calculated as a percentage of a base.
Related calculators
See taxes calculatorsIndicative result for information only; not financial or tax advice. Read the legal notice · How we calculate results
Spotted a possible error in this calculator? Let us know