Import or local buying & selling is normally liable for VAT other than special mentioned exempted items from Vat.(Ex. import or supply of perfumes,cigarates,liquor,etc....)
Wholesale & Retail companies have threshold to register for VAT commencing from 01 November 2016, as per new implement from goverment.
Liable threshold for wholesale & retail companies any consecutive period of 3 months (Quarterly) of Rs.12.5 Million from that companies supplies(Turnover)
you should know your items that import or buying local were exempted from vat otherwise you are liable for vat