Statutory Liquidity Ratio (SLR). Statutory Liquidity Ratio (SLR) is a term used in the regulation of banking in India. It is the amount which a bank has to maintain in the form of cash, gold or approved securities. The quantum is specified as some percentage of the total demand and time liabilities ( i.e. the liabilities of the bank which are payable on demand anytime, and those liabilities which are accruing in one months time due to maturity) of a bank. This percentage is fixed by the Reserve Bank of India.