Cash Reserve Ratio (CRR) requires scheduled commercial banks to maintain 4.75% of their total net demand and time liabilities as reserves with the RBI without interest to ensure liquidity and solvency. Statutory Liquidity Ratio (SLR) requires banks to maintain a minimum of 23% of their net demand and time liabilities as liquid assets such as cash, gold or approved government securities. Non-compliance with CRR and SLR requirements results in penal interest rates being charged to banks by the RBI. Together, CRR and SLR comprise the liquidity reserves that banks must maintain.