However, the long-term Issuer Default Rating (IDR) has been rated with a good credit quality of 'BBB-' with a stable outlook.
"Fitch Ratings has assigned BoI a Long-Term IDR of 'BBB-' and Short-Term IDR of 'F3'. The agency has also assigned the bank a Viability Rating of 'bb-'," the ratings firm said in a release.
Viability Rating (VR) measures intrinsic creditworthiness of a financial institution. 'bb' -- a speculative fundamental credit quality rating -- denotes moderate prospects for ongoing viability.
Bank of India's non-performing loans (NPL) rose to 13.1 per cent at the end of March 31, 2016, against 5.4 per cent a year ago.
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The bank's stressed asset ratio of 16.4 per cent was higher than that of most large government banks in 2015-16.
In the last fiscal year 2015-16, BoI posted a net loss of Rs 6,089.21 crore, which was the highest among large government banks.
"In such a scenario, Bank of India's core capitalisation is weak and continues to be vulnerable to loan losses given net NPL to equity was 87 per cent at the end of March, 2016," it added.
"The government and other related agencies injected around Rs 4,100 crore (13 per cent of FY15 equity) in core capital in FY16. Fitch believes that more capital is necessary to shore up the balance sheet. The bank plans to raise around Rs 5,500 crore in core equity in FY17, which should mitigate some pressure", it added.
On the long-term IDR rating of 'BBB-' on the bank, Fitch Ratings said it is driven by expectations that it will receive extraordinary support from Government due to tis high systemic importance and government's majority ownership.
"The stable outlook on the IDR mirrors the outlook on India's rating (BBB-/Stable). It reflects our view that there is no material change in the sovereign's ability to support banks in a situation of extraordinary stress", it added.