The US-based rating agency, however, affirmed 'BBB-' long-term and 'A-3' short-term issuer credit ratings on BoI, which reflects sound franchise and a very high likelihood of support from the government.
"We revised the outlook to negative because we expect Bank of India's asset quality to continue to weaken over the next 12-18 months, further straining the bank's capitalisation and profitability," Standard & Poor's credit analyst Amit Pandey said.
S&P said it expects BoI's credit costs to remain high because of continued pressure on asset quality, given the tough operating conditions for the corporate sector in India.
"The rising stress in these exposures led to an increase in the bank's stand-alone gross nonperforming loan (NPL) ratio to 9.18 per cent as of December 31, 2015, from 5.39 per cent as of March 31, 2015.
In addition, BoI has sizable exposure to the infrastructure and metal sectors, which "we view as having high risk". These sectors have come under stress in the current business cycle.
"The increase in BoI's NPLs has been the highest among the peer banks that we rate in India; year-over-year NPLs shot up more than 100 per cent by end-December 2015," it added.
This could happen if the bank can't raise sufficient capital to support its balance sheet, its profitability continues to remain weak, or India's economic risk rises.
S&P could revise BoI's outlook to stable if it raises a large amount of capital wherein the risk adjusted capital ratio is above 5 per cent even if India's economic risk worsens, and if the asset quality pressure subsides.
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