In the U.S. and non-EEA countries
For customers based in the US and outside the EEA, the price is in US$ and does not include Value-added tax (VAT) or a sales tax, but it might be added during the checkout process depending on the customer’s postal code.
In the EU
For customers based in the EU, the EEA regulation requires that we collect Value-added tax (VAT) if a VAT number is not provided along with authorization for a charge. VAT will be based on your physical location or the location of your payment provider. Unless required by your country, VAT will not be calculated or displayed prior to processing a charge. Kahoot! will not issue refunds or credits on VAT charged if a proper VAT number was missing at the time of purchase.
You can learn more about this here.