Value-Added Tax, or VAT, is a type of tax mandated by certain countries. The VAT Registration Number is a unique identifier of a business operating in one of those countries, used for the purposes of managing the payment of those taxes.
Currently, VAT is charged only on Alexa subscriptions in the European Union (EU). If you have an EU VAT registration number, you can provide it to us by entering it during checkout, or updating your Payment Information anytime in the Account Management section.
For more information, please see our FAQ, Are taxes charged on Alexa subscriptions?