Open a lease. For more information on how to do so, see section 4.6. or 6.1.
Go to the lease card (see image below).
Click the tab called "Areas & costs" (see image below). Within the tab called "Areas & costs" you will, among other things, find the heading "Include VAT". Note that you will have to scroll the lease card to find the heading "Include VAT".
Specify that the lease you are working with should include VAT by selecting "Yes" below the heading "Include VAT" (see image below).