The government may have to arrange Rs 3.50 trillion of this requirement, the panel on 'Governance of boards of banks' headed by former Axis Bank chairman PJ Nayak said.
"The capital needs of public sector banks, burgeoning because of loan loss provisions, could begin to affect the fiscal health unless an overhaul of bank governance can lead to the better management of public sector banks and thereby to lower capital needs," it said.
The key constituent will be the amount of provision cover to be done on restructured assets.
If the central bank decides to be prudent and goes ahead with its plan of insisting on a 70 per cent provision cover without any forbearance, and other standard assumptions like assets growing at 16 per cent per annum and 30 per cent of restructured assets turning bad every year, the requirement will be the highest.
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In this scenario, where the RBI is most liberal and lowers the provision cover to 50 per cent and throws in more on the forbearance front, the requirement goes down to Rs 2.10 trillion, but the panel makes its displeasure known at adapting this approach, saying this is the "least prudent" way of operating.
The past RBI governor D Subbarao had in July 2013 said all the banks would require Rs 5 trillion in capital as they adopt the Basel-III framework.
The Reserve Bank introduced the Basel III capital regulations for banks effective April 1 this year, one -year later than previously envisaged. The capital requirements will be phased over a period, up to March 31, 2019.