GST billing ERP is an Android application for managing Invoice and Billing operation mainly used for GST filling and Inventory. This application helps you to raise an invoice to record payment for the invoices and according to that providing receipts generated from this app. This application is mainly used for retailers where they can add products list with pricing and quantity which will maintain proper inventory of stock and sales reports can be generated. Similarly for purchase reports and can be generated. Various types of reports can be generated such as sales report, purchase report, product wise report, Profit and loss report. Data can be linked with dropbox account to GST filling also can be backup in memory devices.