The agency said IDFC's switchover into a bank will help its credit profile in spite of the challenges.
"IDFC's move into banking will likely help its credit profile in spite of the challenges," Fitch Ratings said in a note, affirming the 'BBB-' rating with a stable outlook.
It said after the possible launch of the bank in October, the diversification will help its credit profile.
IDFC can also go in for one more round of capital raising, it said, adding, the way IDFC manages the change on its business and risk profiles will be an important consideration for rating in the future.
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The spurt in asset quality stress in infrastructure segment is hurting the non-banking lender. This has also led to speculation if it will be able to keep up with its target of launching the bank by October.
"Fitch believes asset quality will remain weak for at least a few more quarters, although the pace of deterioration may slow. This will be mitigated by IDFC's consistent efforts to build a strong provision buffer," it said.
A bulk of its assets and liabilities will move to the bank, the report said, adding, "the bank will be no different from IDFC (as it is currently) from a risk perspective".
The report warned that IDFC will find it difficult to meet mandatory priority sector lending, given its limited experience in the space.
IDFC was chosen along with micro-lender Bandhan to offer universal banking services in the last round of award of licenses by giving an in-principle nod.