Where can I enter my EU VAT Number?

With a valid EU VAT number you can checkout without paying the applicable 20% VAT, to do this you must enter your VAT number on stage 2 (Details) of the checkout process. 

Refer to the below screenshot:

1. Click the box beside 'VAT Registered? Tic...'
2. This will display two new boxes (Country and VAT Number)
3. Complete both boxes

Not all countries apply to this VAT process but you can check your country by looking through the available options under the 'Country' list.