GST Network, the IT infrastructure backbone that powers the new indirect tax system, is geared to accept up to three billion invoices a month from 8.5 million tax payers from day one. The common portal(www.gst.gov.in) acts as an interface between different stakeholders in the GST ecosystem, namely taxpayers, tax departments, banks, the Reserve Bank of India, external service providers, among others. The portal becomes the touch point for taxpayer registration, invoice upload, tax payment, getting input tax credit, maintaining the cash ledger and liability register, generating MIS reports for taxpayers, tax officials and other stakeholders, and keeping track of status of returns. The system matches (or reconciles) the invoice data in a decentralised manner. The sales data uploaded by the seller (GSTR-1) get auto-populated by the GST system in the purchase register of the buyer (GSTR-2). The buyer has to accept, reject or modify the same based on invoice(s) in his possession. The a...