Indian banking faces an arithmetic problem that threatens the sustainability of its credit boom. Public sector banks are increasingly using surplus liquidity and short-term borrowings from the Reserve Bank of India to support loan growth, as deposits continue to lag behind credit demand.

The numbers reveal the scale of the challenge. System-level bank credit surged 16.1% to ₹214 trillion in financial year 2026, while deposits managed only 13.5% growth to ₹262 trillion. State Bank of India, the country's largest lender, shows this trend clearly; its gross advances climbed 16.9% to ₹49.3 trillion even as deposits increased 11% to ₹59.7 trillion by March-end.

The Liquidity Juggling Act

SBI Chairman C.S. Setty's post-earnings commentary reveals how banks are managing this mismatch. The bank holds excess statutory liquidity ratio reserves of approximately ₹3 trillion—a buffer that can support continued lending even if deposit growth remains weak. Setty suggested that 11-12% deposit growth would suffice, arguing that even modest percentage increases translate to significant absolute amounts given SBI's massive deposit base.

This strategy reflects a broader recalibration across public sector banking. Banks are drawing down surplus SLR holdings above the regulatory minimum of 18%, while simultaneously tapping RBI's short-term borrowing facilities. The central bank permits SLR requirements up to 40%, providing banks considerable flexibility, but this approach transforms what should be emergency liquidity tools into routine funding mechanisms.

The regulatory framework shapes these dynamics. Basel norms require banks to maintain liquidity coverage ratios of 100%, ensuring they hold high-quality liquid assets equal to expected net cash outflows over thirty days. SBI maintains its LCR at 125%—well above the minimum—reflecting the risk-averse approach that characterises public sector banking. Yet this prudence creates its own constraints, as banks accumulate liquid assets that earn steady but modest returns while facing pressure to expand lending.

Systemic Implications for India's Financial Architecture

This credit-deposit divergence carries implications for India's monetary policy transmission and financial stability. When banks rely heavily on RBI borrowings and surplus reserves rather than customer deposits, they fundamentally alter the central bank's ability to manage liquidity cycles and control inflation through interest rate policy.

The pattern creates a feedback loop. Banks dependent on wholesale funding become more sensitive to RBI policy changes, potentially amplifying monetary tightening when the central bank seeks to cool inflation. During monetary easing, excessive liquidity in the banking system—evidenced by banks' need to park surplus funds with the RBI—reduces policy effectiveness.

For India's broader economic strategy, this trend threatens credit availability precisely when the economy requires robust lending for infrastructure development and private sector capital expenditure. The government's emphasis on infrastructure-led growth depends on banks' ability to fund long-term projects, but institutions increasingly reliant on short-term wholesale funding face natural maturity mismatches that constrain their appetite for such lending.

The competitive landscape intensifies these pressures. Mutual funds, fintech platforms, and digital payment systems have captured significant shares of household savings that traditionally flowed to bank deposits. Young Indians increasingly prefer market-linked investments over traditional savings accounts, while digital platforms offer higher yields on short-term investments. Banks find themselves competing not just with each other for deposits, but with an entire ecosystem of alternative financial products.

The Rural-Urban Deposit Divide

India's deposit mobilisation challenge reveals stark geographic and demographic patterns. Urban centres, where banks concentrate their lending activities, also host the most sophisticated investors who migrate toward higher-yielding alternatives. Rural and semi-urban markets, where deposit competition remains less intense, offer banks potential—but only if they can build the distribution networks and product innovation necessary to capture these savings effectively.

Banks struggle to attract deposits in the same metropolitan markets where they most eagerly lend, while vast rural populations remain underbanked despite holding significant savings potential. This geographic mismatch requires strategic repositioning that most public sector banks have been slow to embrace.

Public sector banks' structural advantages—branch networks, government salary accounts, social security payments—should position them well for deposit growth, yet they continue losing market share to private sector competitors and non-bank alternatives. The problem reflects institutional inertia and product innovation deficits that wholesale funding cannot indefinitely mask.

Policy Recalibration Required

The Reserve Bank of India faces a complex balancing act. Allowing banks to continue their current funding strategies maintains short-term credit growth but creates systemic vulnerabilities. Forcing rapid deposit mobilisation could constrain lending growth precisely when economic recovery requires sustained credit expansion.

The central bank could consider differentiated reserve requirements that incentivise term deposits over short-term funding, or regulatory frameworks that limit banks' reliance on wholesale borrowings. Such measures would force banks to compete more aggressively for retail deposits while reducing systemic dependence on RBI liquidity facilities.

Banks themselves need strategic reorientation toward deposit products that can compete with mutual funds and fintech offerings. This requires not just higher interest rates, but innovative products that combine convenience, yields, and tax efficiency. Digital transformation becomes crucial—not merely for operational efficiency, but for creating deposit products that match customer expectations shaped by smartphone-native financial platforms.

Banks cannot indefinitely fund credit growth through surplus reserves and central bank borrowings without creating systemic risks that constrain economic growth. India's banking sector needs a fundamental recalibration that prioritises sustainable funding models over short-term lending momentum. The arithmetic of credit growth demands a comprehensive rethinking of how banks compete for and retain customer deposits in an increasingly sophisticated financial marketplace.