1 check for the car papers if the current owner have the vehicle in his own name and have original file with him, the registration BOOK will be stamped with RED FILE RETURN mark. If the vehicle is with open transfer letter, make sure you hold some amount and pay only after vehicle is transferred.
2 check for tax payment receipt if it is upto date or pending payment.
3 obtain transfer letter, copy of cnic of owner & seller ( if different)
4 obtain delivery letter with date & time of delivery
5 obtain receipt of sale with date & time when sale is completed (if balance amount is paid after transfer)
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Transfer the vehicle in your name as soon deal is finalized. It is crime to drive a vehicle which is not yours or does not belong to a family member.