SLR or statutory liquidity ratio is the minimum percentage of deposits that a bank has to maintain in form of gold, cash or other approved securities.It is the ratio of liquid assets (cash and approved securities) to the demand and term liabilities / deposits.RBI is empowered to increase this ratio up to 40%.hat are CRR and SLR with respect to banks? CRR or cash reserve ratio is the minimum proportion / percentage of a bank's deposits to be held in the form of cash.