Introduction
An invoice does not bring into existence an agreement but merely records the terms of a pre – existing agreement (oral or written). An invoice can be understood as a document that is meant to serve a particular purpose. The GST Law requires that an invoice – tax invoice or bill of supply – is issued on the occurrence of certain event, being a supply, within the prescribed timelines. Therefore, an invoice, among other documents is required to be issued for every form of supply such as sale, transfer, barter, exchange, license, rental, lease or disposal. This chapter provides an understanding of the various documents required to be issued under the GST law, timelines to issue such document and the contents of every such document.