Net Stable Funding Ratio
The Net Stable Funding Ratio (NSFR) is a Basel III structural liquidity standard that requires banks to maintain a stable funding profile over a one-year horizon relative to their assets and off-balance-sheet activities.
While the Liquidity Coverage Ratio (LCR) addresses short-term (30-day) liquidity risk, the NSFR addresses structural funding mismatch over a one-year horizon. A bank that relies excessively on short-term wholesale funding to finance long-dated assets — the classic maturity transformation problem — would fail the NSFR even if it passed the LCR. The NSFR was finalised by the Basel Committee in 2014 and became effective globally from January 2018. In India, the RBI made NSFR mandatory for banks from April 2021.
The formula is: NSFR = Available Stable Funding (ASF) ÷ Required Stable Funding (RSF) ≥ 100 percent. ASF is the funding that is expected to be reliable over a one-year stress horizon. Each funding source is assigned an ASF factor ranging from 0 to 100 percent: equity capital and long-term liabilities (maturity > 1 year) receive 100 percent; stable retail deposits (< 1 year) receive 90–95 percent; less stable retail deposits receive 90 percent; short-term wholesale funding receives 0–50 percent depending on counterparty and maturity.
RSF represents the amount of stable funding that a bank's assets require. Each asset category is assigned an RSF factor: unencumbered Level 1 HQLA receive 0 percent RSF (they require no stable funding as they are immediately liquid); Level 2A assets receive 10–15 percent; residential mortgages receive 65 percent; standard corporate loans receive 65–85 percent depending on maturity; non-performing loans receive 100 percent.
The practical impact of the NSFR is that banks are incentivised to fund long-term assets with long-term liabilities, reducing the risk of rollover failure during market stress. Banks that relied heavily on short-term interbank borrowings or overnight commercial paper to fund multi-year project loans would face NSFR penalties, forcing them to either lengthen their funding profile or shorten their asset duration.
In the Indian banking context, public sector banks with large retail deposit franchises typically have strong NSFR ratios given the sticky nature of small savings and current account balances. Private banks and foreign banks that depend more on bulk deposits and wholesale certificates of deposit tend to face greater NSFR management challenges. The ratio also has implications for liquidity risk management teams, influencing decisions on fixed deposit maturities, long-term bond issuances, and interbank lending.
For equity investors, a deteriorating NSFR at a bank can signal rising funding risk, especially if credit growth is outpacing deposit mobilisation — a dynamic that emerged in the Indian banking sector during 2022–2024 when loan-to-deposit ratios at several banks rose sharply. The RBI's commentary on NSFR compliance is therefore a useful supplementary indicator alongside LCR when assessing balance sheet resilience.