Net Stable Funding Ratio
The Net Stable Funding Ratio (NSFR) requires banks to fund long-term, illiquid assets with stable, long-term liabilities, ensuring that banks are not structurally dependent on short-term funding that could disappear in a stress scenario extending beyond 30 days.
While the Liquidity Coverage Ratio addresses 30-day stress liquidity, the NSFR targets the structural funding profile of a bank over a one-year horizon. Before 2008, many banks engaged in maturity transformation on a massive scale — funding long-term mortgage portfolios and other illiquid assets with overnight or short-term repo and commercial paper. When short-term funding evaporated in 2008, the fundamental mismatch between asset maturity and liability maturity became a systemic vulnerability. The NSFR is designed to prevent this structural fragility.
Available Stable Funding (ASF) is the liability side of the ratio, weighting different funding sources by their estimated stability over a one-year stress period. Equity capital and long-term debt (maturity over one year) receive a 100% ASF factor — most stable. Retail deposits receive 90-95% ASF factors depending on whether they are insured and operationally active. Wholesale funding from non-financial corporates receives 50% ASF; short-term unsecured wholesale funding from financial institutions receives 0-50%. Funding that effectively matures or can run off within 30 days under stress gets a 0% ASF factor.
Required Stable Funding (RSF) is the asset side, applying factors based on how long assets would need to be funded in a stress scenario. Cash and central bank reserves need minimal stable funding (0% RSF). Loans to non-financial corporates with under one-year remaining maturity require 50% RSF; loans maturing beyond one year require 65-85% RSF. Residential mortgages require 65-85% RSF. Securities below investment grade and unencumbered equities require 50-85% RSF.
The minimum NSFR in the US is 100%. The requirement became effective for large US banks in 2021 after being finalized by the Federal Reserve, OCC, and FDIC. Banks managing the NSFR must balance issuing long-term debt (which adds ASF) against the cost of that funding versus short-term alternatives, directly influencing bank funding mix and net interest margin.
For bank analysts, the NSFR provides insight into funding structure stability — a bank with a high NSFR is less exposed to short-term funding market dislocations, a risk premium that matters for credit ratings and funding costs.