The Statutory Liquidity Ratio (SLR) is the percentage of the deposits that banks must maintain in the form of liquid cash, gold or other securities. The current SLR rate is 18%. Cash Reserve Ratio (CRR) is the minimum amount of cash as a percentage of their total deposits which banks must maintain as a reserve with the RBI. The current CRR requirement is 4.5%. The purpose of the above two instruments is to manage banks' liquidity.