GST portal scaled up to handle 3 lakh taxpayers concurrently The Goods and Services Tax Network (GSTN) portal will now be able to handle double the taxpayer traffic for return filing than it used to after the GST infra was upgraded to handle up to three lakh users at a time. “The GSTN Portal now successfully handles almost double the taxpayer traffic for return filing immediately after lockdown. It has been made possible as the GST infra has been upgraded to handle up to three lakh concurrent logged-in users at a time,” according to an official statement.