Base Rate
The Base Rate was the minimum lending rate set by commercial banks in India, below which they were not permitted to extend credit (with certain exceptions), introduced by the RBI in July 2010 and subsequently replaced by the MCLR system in April 2016.
Before the Base Rate, Indian banks used the Prime Lending Rate (PLR) system, under which loans were often disbursed at sub-PLR rates through negotiated discounts, making the PLR largely meaningless as a reference rate. The Base Rate regime, effective July 2010, mandated that all loan rates be at or above the Base Rate, with exceptions only for DRI (Differential Rate of Interest) scheme loans, staff loans, and loans against banks' own deposits. This created a transparent floor that consumers and regulators could monitor.
The Base Rate was calculated by including the cost of deposits, the negative carry on CRR and SLR, unallocated overhead costs, and a profit margin. Unlike MCLR, the calculation used average rather than marginal cost of funds, which meant that even as fresh deposits were priced lower during rate-cut cycles, the large stock of higher-rate legacy deposits kept the average cost elevated. This structural inertia was the primary reason transmission of rate cuts was slow under the Base Rate regime.
The RBI studied data showing that between 2013 and 2016, despite multiple repo rate cuts, base rates barely moved at many banks. A notable pattern emerged where public-sector banks were slower to cut than private banks, partly because their deposit base had a higher proportion of retail fixed deposits locked into longer tenors at historically higher rates. This asymmetry — faster response to rate hikes than cuts — drew regulatory attention and ultimately led to the MCLR framework.
Although the Base Rate has been superseded by MCLR for new loans, some legacy institutional and corporate loans originated before April 2016 remain linked to the Base Rate. Banks still publish their Base Rates, and these loans reset based on the bank's current Base Rate at the contractual reset date. Borrowers in this category may compare their effective rate against MCLR or external benchmark-linked equivalents to determine whether switching is beneficial.
The Base Rate episode offers a broader lesson about benchmark design in financial markets. A rate benchmark is only effective if it genuinely reflects current funding costs and if banks face competitive pressure to pass on changes. The progressive shift from PLR to Base Rate to MCLR and then to external benchmark-linked rates represents India's iterative effort to achieve better monetary policy transmission — a process that mirrors reforms seen in advanced economies after the LIBOR manipulation scandals prompted moves toward risk-free rate benchmarks.