E-Invoice Validator
Check a UBL or CII e-invoice against the EN 16931, Peppol and XRechnung business rules.
Invoice Tax Rate Calculator
Work out the rate from a net and a gross, or the effective rate on a mixed invoice.
Fill in any two and the third is worked out from them.
Quick Tool Overview
The Invoice Tax Rate Calculator finds the rate somebody actually applied from any two of the net, tax and gross, works out the effective rate across a mixed invoice, and flags a rate that matches no real one.
- What it does
- Finds the tax rate that was applied
- You give it
- Any two of net, tax and gross
- You get back
- The rate, and whether it is a real one
- Best for
- Checking a supplier’s invoice
About the Invoice Tax Rate Calculator
Two questions come up often enough to need a tool. The first is what rate somebody actually applied: you have a net figure and a gross figure on a supplier’s invoice and you want to know whether the 17.4% it implies is a rate anywhere, or a mistake. The second is what the effective rate across a whole invoice is, when it mixes rates.
The first is division. The second is more useful than it sounds: the effective rate is what a customer sees when they divide the tax by the net, and if it is not one of the rates on the invoice — which it will not be, on a mixed invoice — somebody will ask about it. Knowing the figure before they do is worth having.
It also matches the rate against the standard rates in use around the world, so an unrecognised rate is flagged as one rather than accepted quietly. A supplier charging 19% in a 20% country is charging the German rate by accident, and that is far more common than it should be.
Key features of the Invoice Tax Rate Calculator
From any two figures
Net and gross, net and tax, or gross and tax.
Matched against real rates
A 19% charge in a 20% country is Germany by accident.
Effective rate
What a customer sees on a mixed invoice, before they ask about it.
Three decimal places
Because some real rates are fractional.
Errors named
Rate on the gross, wrong country, or compounded rounding.
How to use the Invoice Tax Rate Calculator
-
1
Enter the net and the gross
Or the net and the tax — any two of the three.
-
2
Read the rate
To three decimal places, because some real rates are fractional.
-
3
Check the match
Against the standard rates actually in use, so an odd one is flagged.
-
4
For a mixed invoice, list the lines
Each with its own rate, to get the effective rate across the whole.
Frequently asked questions
Divide the tax by the net and multiply by 100. If you only have the gross, subtract the net first: (gross − net) ÷ net × 100.
The total tax divided by the total net, across an invoice that mixes rates. It will not equal any single rate on the document, which is exactly why customers query it.
Usually an error — the wrong country’s rate, a rate applied to the gross rather than the net, or a rounding mistake compounded across many lines. Occasionally it is a genuine reduced or special rate, which is worth confirming.
Yes. Switzerland charges 8.1%, Nigeria 7.5%, and India has a 0.25% rate on rough diamonds. A fractional rate is not automatically a mistake.
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