The rule
The VAT Executive Regulation blocks input tax on motor vehicles purchased, leased or rented that are available for personal use by anyone. A motor vehicle here means a road vehicle designed or adapted to carry no more than ten people including the driver. Trucks, forklifts and similar equipment are outside that definition, and vehicles used as licensed taxis, registered emergency vehicles and vehicles rented to customers in a rental business are not treated as available for personal use.
The test is availability, not actual use. A sedan that the sales manager takes home every evening is available for personal use even if she only drives to clients.