This document summarizes the Sales Tax Act of 1990 in Pakistan. It provides an overview of key chapters and sections of the act, including its scope and payment procedures, registration requirements, bookkeeping and invoicing, returns, appointments of tax officers and their powers, offences and penalties. The act establishes the legal framework for sales tax administration in Pakistan, covering topics such as tax rates, exemptions, collection of tax dues, and offences against tax evasion. It assigns powers and authorities to various tax administration directorates to investigate, audit and enforce the act.