"Banks both public and private sector ones, are expected to issue non-equity capital bonds of Rs 2.5-3 trillion over the next three years till FY17," it said in a statement.
State-run banks would account for over two-thirds of these bond issuances, while private banks would account for the rest, it said.
Around 40 per cent of this amount would be in tier-II capital bonds, while the remaining 60 per cent would be in additional tier-I capital bonds, it said.
"Additional tier-I investors could incur a loss on the coupon if the common equity falls below 8 per cent, and even the principal could be at risk if common equity tier-I drops below 5.5 per cent," it said.
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So far, there has been no issuance of an additional tier- I instrument by any state-run bank, while Basel-III compliant tier-II bonds are subscribed to only by a government-run insurer, ICRA co-head (financial sector) ratings Vibha Batra said.
Batra added that if banks were unable to find takers for these subordinated bonds, they would have to bridge the gap by opting for a higher core tier-I equity capital.