"Assuming a 75 basis points decline in interest rate, annual interest income loss to banks (on lending operations) could be in the range of Rs 150-220 billion," it said in a study.
The draft guidelines issued by RBI earlier this month seems to follow upon the central bank's concern that despite a 0.75 per cent cut in the policy rate in the current fiscal, banks (on an average) lowered their base rates by just 0.25-0.30 per cent.
The RBI issued draft guidelines on computation of base rate based on marginal cost of funds methodology. The RBI proposes to implement the guidelines with effect from April 1, 2016, and banks have to present the roadmap to meet the guidelines within two months from the date of final circular.
"While the draft norms hold the potential to improve the efficiency of monetary policy transmission, banks would have to bear the cost in the form of lower net interest margins (NIMs) till the time their deposits get re-priced to lower levels (on a par with the marginal cost of funds) in a declining interest rate scenario," it said.
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It further said that a decline in banks' base rates could improve their competitive positioning, as in the current scenario banks are losing highly rated corporates to capital market sources (bonds and commercial paper).
As on June 30, banks' credit portfolio grew by a mere 8.5 per cent on annual basis while credit through bonds and commercial papers reported growth rates of 21 per cent and 59 per cent, respectively.