"Our rating actions in FY16 when seen in conjunction with value of debt upgraded or downgraded, suggest systemic credit quality remains under strain," Icra said in a report.
In FY16, it upgraded the ratings of 785 issuers as against 533 downgrades, it said, adding that there were 7,371 issuers whose ratings were outstanding at the beginning of the last fiscal.
Debt value weighted credit ratio stood "significantly depressed" at 0.6 time in FY16. "Weighted credit ratio of Icra-assigned ratings stood significantly depressed at 0.6 times in FY16," it said.
"This suggests that systemic credit quality remains under strain, a fact that is also underscored by the rise in the financial sector's bad loans, the large volume of corporate debt restructured or refinanced, the still-high leveraging levels of a large number of corporate entities, and the large count and proportion of rating downgrades in the investment-heavy sectors," its chief rating officer Anjan Ghosh said.
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On a sectoral basis, it said companies in metals and mining, real estate and construction, roads and engineering have faced significant deterioration in the past few years and accounted for 40 per cent of the downgrades due to factors like challenging operating environment and weak demand.
Commenting on the government actions on the stressed sectors like power, coals, roads, mining and oil and gas, it said while the measures are positive, a "meaningful improvement in the credit quality" due to it will take longer.
Global factors which will influence credit quality in the future include price of crude oil and other commodities, relative currency movements, monetary policy actions by central banks, developments in China and Europe, besides the geo-political environment, it said.