How much custom duty i have to pay if a purchase an electronic equipment from ebay?
Go to fbr.gov.pk and see the customs tariff applicable on the item.
Well beside custom duty there is a things known as ITP or Import Trade Price.
for example these days Blankets ITP is $4.7/kg and the CD (custom Duty) is 30% including everything.
the other case is Baby Diaper the ITP is $2/kg and CD is 72% total.
Before importing, discuss it with custom agent on lumsum, as you need importer license and etc, and clearning agent do all this stuff.
If you are looking for regular business related to electronics, I can refer you a guy in Islamabad.
As a rough estimate, it will be 21% of CIF, that is the Cost of Goods + Freight Cost when landed in PK.