It, however, affirmed the senior unsecured and local currency deposit ratings of IOB at Baa3 on a high likelihood that the government will support the lender.
"Moody's has lowered IOB's bank financial strength rating (BFSR) to E+ from D-, which is equivalent to a baseline credit assessment (BCA)of b2, two notches lower than the previous BCA," the rating agency said in a note today.
The Chennai-headquartered bank reported a sharp increase in gross non performing assets at 7.35 per cent for September quarter as against 5.84 per cent in the year-ago period.
Moody's warned that IOB's reserves and capital provide a narrow buffer against potential losses and added the bank's core tier-I capital has slipped to 7.3 per cent in September as against 7.4 per cent in the year ago period.
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However, there shall be some improvement in the ratio with the government's capital support which is expected before March 2015, it said.
Moody's said the lender will continue to post a fall in profits as it did in the September quarter on falling net interest margins and elevated provisioning expenses.
However, if the same increase to over 7.5 per cent each, the rating may go down as well, Moody's warned.