A value-added tax (VAT), sometimes known as a goods and services tax (GST) in some countries, is a sort of incremental tax. It's similar to sales tax and is frequently compared to it.
If you did not include your VAT number in your Account Details at the time of purchase, please do so in DataCamp's Account Settings > Subscription and email support@datacamp.com so that the Support Team can obtain a rectified invoice on your behalf.
