Sales tax and VAT calculator

How to use it

1. Choose “Add tax to a net price” or “Remove tax from a gross price”.
2. Pick a country’s standard rate from the list, or type any rate.
3. Enter the amount.
4. Read the net amount, the tax and the gross amount.

Adding tax, and taking it back out

Adding is the easy direction: 100 at 20% is 120. Removing it is where people slip. The tax inside a 120 gross price at 20% is not 20% of 120 — it is 120 ÷ 1.20 = 100 net, so 20 of tax. Taking 20% off the gross would give 96, which is 4 short and is a real invoice error rather than a rounding one.

These rates are a starting point, not advice

The presets are standard rates as at September 2026. Reduced, zero and sector-specific rates exist nearly everywhere and depend on what you are selling; rates change by legislation, sometimes mid-year; and where you owe tax at all depends on where you and your customer are and on whether you are registered. The rate field accepts anything, which is the honest way to use this page. Confirm with your tax authority or your accountant before invoicing on a number from here.

Sellstamp’s own VAT handling is a different thing entirely: it charges tax only where a merchant has declared a scheme, at the rate for the country the buyer declared, and it does not read this page.