A new tax has been introduced to try and eliminate own practice from the car industry.
The rule is that if you sell the vehicle before 90 days of owning it you have to pay an extra 50,000 PKR withholding tax at the time of registration
To escape that tax car dealers and showrooms or any person that is selling their car on own will sell you the car and give you the invoice documents etc and tell you to register it after 3 months or 90 days so that you dont have to pay that extra tax.