Gross NPA level stood at Rs 4.5 lakh crore or 6 per cent as on December 31.
"As most banks are yet to fully recognise NPAs, it is likely that NPA addition will remain high in Q4 FY16 as well. While the second half of FY16 should not be taken as the base for predicting the future performance of banks, significant NPA recognition in H2, FY16 could take up the gross NPAs to 6.2-6.8 per cent by March 31," rating agency's group-Head (financial sector ratings) Vibha Batra said in a report.
The profitability of banks could therefore remain low (return of equity of less than 10 per cent) in FY17 as well.
In the rating agency's estimate, 70-80 per cent slippages in the third quarter were from standard assets, which points to inherent weakness in standard accounts.
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As a result banks' total stressed advances increased from 10.8 per cent in September 2015 to 11.6 per cent in December.
The report said around 15-16 per cent of the total credit in the banking industry is weak, involving NPAs, restructured advances, or other exposures to entities which are facing credit issues. This works out to Rs 11-12 lakh crore, even as only Rs 4.2 lakh crore is recognised as NPAs.
But in a stress scenario, that is if recoveries and upgrades drop from past levels and the structural problems are not addressed, gross NPAs percentage could increase to 7.5-8.5 per cent by March 2019, it said.
The report said PSBs losses in second half are likely to be sizable in relation to Rs 25,000 crore infused by government as equity.
On an aggregated basis, PSBs reported net losses of Rs 11,400 crore in the third quarter; a similar trend is likely in the fourth quarter.