The National Informatics Centre (NIC) has issued a list of GSTINs dated January 27, 2021, for whom e-invoicing shall be mandatory. There are 73308 GSTNs who are enlisted by the NIC for whom it is mandatory for the taxpayer to upload the invoice details and register supply transaction on the Government Invoice Registration Portal. ‘E-invoicing’ or ‘electronic invoicing’ is a system where the taxpayer will upload his invoice details and register his supply transaction on the Government Invoice Registration Portal (IRP) and get the Invoice Reference Number (IRN) generated by the IRP system. The taxpayer will first prepare and generate his invoice using his ERP/accounting system or manually and then upload these invoice details to IRP and get the unique reference number, known as IRN. It is noteworthy that the e-invoice does not mean preparation or generation of taxpayer’s invoice on the government portal. It is only intimating the government portal that invoice has been issued to the buyer, by registering that invoice on the government portal.