GST Filing is the process by which buyers and suppliers file their GST returns to the IT Department of the Indian government. A GST return is essentially a document that contains details regarding the taxpayer's income that helps IT officials calculate their liability for a particular period. Registered GST dealers have to file GST returns for purchases, sales, Output GST, and Input Tax Credit. To complete the GST filing, dealers require compliant sales and purchase invoices. Read on to find out more about GST Filing, why it’s important and how to get it done.