Net Stable Funding Ratio (NSFR) Calculator
The Net Stable Funding Ratio (NSFR) measures whether a bank holds enough long-term, stable funding to cover its one-year funding needs. Under Basel III, every bank must maintain an NSFR of at least 100 percent. Enter your Available Stable Funding (ASF) components and Required Stable Funding (RSF) components below to calculate your ratio and see exactly where you stand against the regulatory threshold.
Formula
Worked example
A bank has: Tier 1 capital 500m, stable retail deposits 800m, less stable deposits 300m, corporate deposits 200m. ASF = (500 x 1.00) + (800 x 0.95) + (300 x 0.90) + (200 x 0.50) = 500 + 760 + 270 + 100 = 1,630m. RSF assets: L2A 150m, L2B 100m, mortgages 400m, high-RW loans 200m, illiquid 50m, OBS 100m. RSF = (150 x 0.15) + (100 x 0.50) + (400 x 0.65) + (200 x 0.85) + (50 x 1.00) + (100 x 0.05) = 22.5 + 50 + 260 + 170 + 50 + 5 = 557.5m. NSFR = 1,630 / 557.5 = 292.4% - well above 100%.
What is the Net Stable Funding Ratio?
The Net Stable Funding Ratio is a liquidity standard introduced by the Basel Committee on Banking Supervision as part of the Basel III framework. Its purpose is to ensure that banks maintain a stable funding profile in relation to their assets and off-balance-sheet activities. The ratio looks one year ahead: it compares the stable funding that a bank is expected to hold (ASF) against the stable funding it is required to hold given the nature of its assets and commitments (RSF). A ratio at or above 100 percent means the bank has enough long-term, reliable funding to survive a prolonged period of stress without needing to roll over short-term wholesale borrowing. The NSFR became a minimum standard on 1 January 2018 for most Basel member jurisdictions, with the European Union implementing it as a binding requirement from June 2021.
How ASF and RSF weights work
The NSFR does not count all liabilities and assets equally. Each balance-sheet item is multiplied by a factor between 0 and 1 that reflects how stable or how demanding it is from a long-term funding perspective. On the liability side, Tier 1 and Tier 2 capital and any obligation maturing in more than one year receive an ASF factor of 100 percent, because they are reliably available. Insured retail deposits in a stable customer relationship receive 95 percent. Less stable retail deposits and small business deposits receive 90 percent. Short-term wholesale funding from non-financial corporates and sovereigns receives only 50 percent, reflecting the risk that it may not be renewed. On the asset side, liquid central bank reserves need no stable funding (0 percent RSF), Level 2A high-quality liquid assets need 15 percent, and illiquid or encumbered assets need 100 percent. This asymmetric weighting creates a strong regulatory incentive to match long-lived assets with long-lived liabilities.
NSFR versus the Liquidity Coverage Ratio (LCR)
Banks subject to Basel III must meet both the NSFR and the Liquidity Coverage Ratio. The two ratios target different time horizons and stress scenarios. The LCR focuses on a 30-day acute liquidity stress event: it requires banks to hold enough Level 1 and Level 2 liquid assets to cover projected net cash outflows over one month. The NSFR focuses on structural funding over a 12-month horizon: it does not require banks to liquidate assets quickly but instead requires them to have stable, long-term sources of funding already in place. A bank can be LCR-compliant while having an NSFR problem if it relies heavily on short-term wholesale markets to fund long-term illiquid assets.
How to interpret your NSFR result
A ratio above 100 percent means that ASF exceeds RSF and the bank meets the Basel III minimum. The surplus (ASF minus RSF) represents the amount of additional stable funding available beyond what is required. Regulators and rating agencies typically view a ratio of 110 to 120 percent or above as indicating a comfortable buffer. A ratio between 100 and 110 percent is compliant but leaves little room for asset growth or funding market disruption. A ratio below 100 percent is a regulatory breach: the bank must either raise long-term stable funding, extend the maturity of existing liabilities, or reduce holdings of illiquid assets to restore compliance.
Basel III ASF and RSF factor reference
| Component | Factor | Category |
|---|---|---|
| Tier 1 and Tier 2 capital; liabilities >= 1 year | 100% | ASF |
| Stable retail and SME deposits (< 1 year) | 95% | ASF |
| Less stable retail/SME deposits (< 1 year) | 90% | ASF |
| Short-term corporate, operational, gov deposits | 50% | ASF |
| Other liabilities not captured above | 0% | ASF |
| Level 1 HQLA (coins, central bank reserves) | 0% | RSF |
| Level 2A assets (AA- sovereign/corp bonds) | 15% | RSF |
| Level 2B assets; financial loans 6-12 months | 50% | RSF |
| Mortgages/loans to non-financials >= 1 yr, RW <= 35% | 65% | RSF |
| Performing loans, RW > 35%; non-HQLA equities | 85% | RSF |
| Encumbered assets >= 1 yr; illiquid assets | 100% | RSF |
| Off-balance-sheet commitments (minimum) | 5% | RSF |
Summary of the key factor weights used in the NSFR calculation under the Basel III framework (BCBS d295, 2014).
Frequently asked questions
What is the minimum NSFR required under Basel III?
Basel III requires banks to maintain an NSFR of at least 100 percent at all times. This means Available Stable Funding must equal or exceed Required Stable Funding. Supervisors may impose a higher institution-specific minimum as part of Pillar 2 requirements.
What is the difference between ASF and RSF?
ASF (Available Stable Funding) is the weighted sum of a bank's liabilities and capital, where the weight reflects how reliably each source of funding can be counted on over a one-year stress scenario. RSF (Required Stable Funding) is the weighted sum of a bank's assets and off-balance-sheet commitments, where the weight reflects how much stable funding each asset demands. The NSFR is simply ASF divided by RSF.
Why do stable retail deposits have an ASF factor of 95% rather than 100%?
Even insured, relationship-based retail deposits carry a small probability of withdrawal during a stress event. The 5 percent haircut reflects the Basel Committee's conservative assumption that a small fraction of even the most stable retail funding could leave in a 12-month stress scenario. Deposits that are uninsured or in a currency other than domestic are classified as "less stable" and receive a 90 percent factor.
How does holding HQLA affect the NSFR?
Level 1 High-Quality Liquid Assets such as central bank reserves and qualifying sovereign bonds carry a 0 percent RSF factor. This means they contribute to the LCR but do not increase RSF. Banks that hold more HQLA therefore lower their RSF denominator, which improves the NSFR. However, holding HQLA earns low returns, so there is a profitability trade-off.
When did the NSFR become mandatory?
The NSFR became a minimum standard for Basel Committee member jurisdictions on 1 January 2018. Implementation timelines varied by country. The European Union adopted the NSFR as a binding Pillar 1 requirement through the Capital Requirements Regulation II (CRR2), effective from 28 June 2021. Banks must report their NSFR to supervisors at least quarterly.
What happens if a bank's NSFR falls below 100%?
A breach of the 100 percent minimum triggers supervisory action. Regulators typically require the bank to submit a funding recovery plan outlining how it will restore compliance. Options include issuing long-term debt (raising ASF), growing stable retail deposits (95% ASF), selling or winding down illiquid assets (reducing RSF), or shortening off-balance-sheet commitments. Persistent non-compliance can result in restrictions on dividend payments, share buybacks, or bonus distributions.