This document discusses sales tax in Pakistan. It defines sales tax and notes that it is charged on locally produced and imported goods with some exemptions. It outlines who must register and pay sales tax, including manufacturers, retailers above a certain threshold of sales, importers, wholesalers, and others required by law. It also discusses sales tax invoices, input and output tax, tax rates schedules, and provides an example calculation of net tax owed. Finally, it briefly discusses provincial sales tax on services in Punjab and Pakistan's Income Support Levy Act.