The banking system's gross NPAs shot up to 8.5 per cent by the June quarter, as against 4.6 per cent a year ago. The spike was largely due to the doubling of NPAs at public sector banks to 10.4 per cent compared to 5.3 per cent in June 2015.
However, the rating agency did not quantify the bad loans in absolute terms.
Private sector lenders witnessed their NPA ratio increasing to 3 per cent from 2.1 per cent a year ago, it added.
Many state-run lenders reported net losses in the June quarter, with market leader SBI turning in a 32 per cent drop in net income, while private sector banks' net collectively fell just 2.6 per cent.
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The agency said given the government's plan to raise money by offloading stakes in banks, profit is an important issue.
However, it termed the recognition of NPAs as a positive step in the long term as higher provisioning makes the state-run lenders better prepared to face the market.