If your company is located in an EU membership country, we need your VAT number (example: DTU Wind Energy's VAT number is DK30060946) in order to avoid adding 25% of Danish tax to your invoice. Please notice that EU VAT has nothing to do with how much tax you pay in your own country. If you have no EU VAT number, although your company is located in an EU membership country, we have to add 25% of Danish tax to your invoice.