The GST Network (GSTN), the entity responsible for the information technology backbone of the goods and services tax (GST), opened its system on Monday for invoice uploading. It is not mandatory to start the uploading but “it´s live”, said Prakash Kumar, chief executive officer (CEO) of GSTN. This was earlier permitted but only foraselect few such as Suvidha providers, tax consultants and some officials. Kumar said invoices could be uploaded through Suvidha providers or by assessees themselves. For this purpose, GSTN had launched an Excel template on June 30, beside offline tools. Archit Gupta, CEO of ClearTax, one of the Suvidha providers, said taxpayers might find it difficult to locate the page where invoices have to be uploaded. “We also observed that only JSON files are supported. Businesses maintaining Excel sheets for invoices need to convert these to JSON format,” he said. Praveen Khandelwal, secretary general of the Confederation of All India Traders (CAIT