SBI’s Margin Squeeze Shows Why Rate Cuts Complicate Banking

State Bank of India’s latest quarterly earnings carried an uncomfortable message for Indian banking. Loan growth remains abundant. Profitability no longer is.

India’s largest lender reported nearly 17% growth in advances for 2025-26, with momentum spread across corporate loans, agriculture and retail segments. Gold loans more than doubled from a year earlier. Asset quality remained comfortable, with gross bad loans falling to 1.5% and credit costs staying low. On the surface, this looked like another reassuring quarter from a banking system that spent much of the past decade repairing itself.

The strain appeared elsewhere.

Domestic net interest margins fell to 2.93% in the January-March quarter from 3.11% three months earlier as the impact of RBI rate cuts passed rapidly through SBI’s floating-rate loan book. The bank admitted the decline reflected the full impact of lower repo-linked lending rates alongside softer yields on investments.

SBI is effectively confronting the downside of a model that worked brilliantly when interest rates were rising. Over the past few years, Indian banks aggressively shifted borrowers toward external benchmark-linked loans and treasury bill-linked pricing structures because they allowed lending rates to rise quickly during monetary tightening. Faster transmission boosted margins and profitability.

The problem is that transmission works both ways.

Once the RBI started easing policy, loan yields adjusted downward immediately, while deposit costs declined much more slowly. SBI’s yield on advances fell 11 basis points sequentially, while deposit costs eased by only three basis points.

That gap matters more than headline profit growth.

 In fact, SBI’s quarterly profit held up partly because provisions fell sharply, not because the core operating engine accelerated. Treasury income also turned volatile as rising bond yields produced mark-to-market losses.

The most revealing part of management commentary was not the reassurance that margins would stabilise above 3%. It was the acknowledgement that the bank is now shifting parts of its corporate loan book from treasury bill-linked rates back toward the marginal cost of funds-based lending rate structure.

Indian banking spent years celebrating faster monetary transmission. SBI’s quarter suggests banks are rediscovering the virtues of slower repricing.

That transition could define the sector’s next phase.

During the post-pandemic recovery, banks benefited from a rare combination of improving asset quality, robust credit demand and rising interest rates. Those tailwinds allowed lenders to expand balance sheets while steadily lifting returns on equity.

The next cycle may prove less forgiving.

Credit demand remains healthy, especially in infrastructure, retail and emerging industrial sectors. SBI itself expects loan growth of 13-15% this year. Yet margins are now becoming harder to defend precisely because monetary conditions are easing.

That leaves Indian banks facing a more mature challenge. The issue is no longer balance-sheet repair or bad-loan recognition. It is whether banks can preserve profitability once rate cycles turn supportive for borrowers rather than lenders.

For SBI, and perhaps for the broader sector, the easy phase of the banking cycle may already be over.