The RBI could also suggest large NBFCs be required maintain a cash reserve ratio. The Reserve Bank of India is likely to propose stricter regulatory norms for shadow banks in a bid to strengthen solvency and sustainability of a sector that has been showing signs of stress in recent years, two sources said. RBI began trying to move towards tighter norms for the sector after Infrastructure Leasing & Financial Services, the largest NBFC, went bankrupt in 2018, and Dewan Housing Finance Corp and Altico Capital defaulted on payments in 2019. The RBI is expected to set out its proposals in a discussion paper next week and recommend that bigger non-banking finance companies (NBFCs), or shadow banks, maintain a statutory liquidity ratio (SLR), the sources said.