Public sector banks alone may need a whopping Rs 93,000 crore of this amount, the report said, adding banks need an additional core capital of Rs 2.5 trillion under Basel-III guidelines.
"Banks may need up to Rs 1 trillion over and above their Basel-III capital requirements to manage the concentration risks arising out of their exposure to highly levered, large stressed corporates," India Ratings said in a report today.
The report, however, said if corporates are able to reduce borrowing costs by 100 bps, the shortfall may come down to Rs 76,000 crore from the estimated Rs 1 trillion.
"While our analysis indicates a potential haircut on a blended basis at around 23-24 per cent, banks may also consider a senior-subordinated structure for the current exposure," the report said.
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Of this Rs 1.80 trillion fresh growth capital, the government said it would provide Rs 70,000 crore over a period of four years out of which they will be getting Rs 25,000 crore in FY16 and a similar amount in FY17. The banks would have to raise the balance amount from the markets, the ministry had said.
The agency said the access to equity will be a critical input to its rating of additional tier-1 bonds, as the instruments carry loss triggers linked to the bank's common equity tier-1 ratio.