Tax is just 12,500 for filer and 65,000 for non-filer if car 1301-1600 cc is less than one year old. Since my car is more than one year old it would be 10% lesser or 11,250 (for two years old it will be 20% and so and no WHT after five years).
Here is transfer fee schedule/charges/tax for Islamabad transfers
http://islamabadexcise.gov.pk/