"We expect SBI performance to remain better than its public sector peers and therefore we are affirming our 'BBB-' long-term and 'A-3' short-term issuer credit ratings on the bank," S&P said in a note.
It said the stable outlook reflects its expectation that the bank will maintain its financial profile over the next 24 months.
The agency also reaffirmed its 'A-3' short-term issuer credit rating on State Bank of India apart from affirming all the issue ratings on the bank's debts.
SBI's stressed asset quality and moderate capital temper these strengths.
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With over 20 per cent market share, SBI is the undisputed leader in terms of assets, loans, and deposits underpins its business position and this will only get further solidified after the bank's proposed merger with its subsidiaries, it noted.
"The strong business position also contributes to the bank's good funding profile. Consumer and market confidence in SBI remain strong as demonstrated by the bank benefiting from the "flight to quality" during the 2008 global financial crisis," the report noted.
Individually, he said, managing a large organisation and aligning associates' policies and asset quality recognition norms in line with its own would be a challenge.
On recapitalisation, he said this will remain moderate.
"In our opinion, lower earnings will not be sufficient to
support SBI's average loan growth. The recent capital issuances and revaluations reserve should, however, provide a fillip to the bank's capitalisation.
He also said the agency does not see any downside risk to the rating nor does it see any upside potential because it would not rate the bank above the sovereign rating and does not expect to upgrade the sovereign rating in the next 18-24 months.