HOW BANKING WORKS · LIQUIDITY 39
One bank can survive the next month and still have a weak funding structure for the next year
Liquidity is not one question. A bank has to survive immediate outflows and also avoid building a balance sheet that depends permanently on unstable funding.
The Basel framework therefore uses more than one liquidity standard. The Liquidity Coverage Ratio focuses on short-term resilience under a severe stress scenario. The Net Stable Funding Ratio focuses on whether the bank’s asset and off-balance-sheet structure is supported by funding considered sufficiently stable over a longer horizon.
This article continues Batch 10 under How Banking Works.
The first question: can the bank survive a short severe stress?
The Liquidity Coverage Ratio—LCR—asks whether the bank holds enough high-quality liquid assets to cover stressed net cash outflows over the regulatory short-term horizon.
LCR = stock of eligible HQLA ÷ stressed net cash outflows over the prescribed short-term horizon.
The Basel standard is built around a 30-calendar-day stress period. The point is not that every crisis lasts exactly thirty days. The point is to require a bank to carry enough liquidity to survive an intense initial phase without immediately depending on emergency asset destruction.
The current official source is the Basel Committee’s Liquidity Coverage Ratio standard.
The second question: is the funding structure stable enough for the asset structure?
The Net Stable Funding Ratio—NSFR—looks beyond the first month. It asks whether the amount of stable funding available to the bank is appropriate relative to the stability required by its assets and off-balance-sheet exposures.
NSFR = available stable funding ÷ required stable funding.
The framework uses a one-year structural horizon. Longer-lived and less-liquid assets require more stable funding support than shorter, more liquid positions.
The current official source is the Basel Committee’s Net Stable Funding Ratio standard.
Why one ratio cannot do both jobs
A bank can hold a large stock of liquid securities today and therefore look strong under a short-horizon stress. But if it finances long-term loans with funding that matures repeatedly over the coming year, its structural funding profile can still be fragile.
Conversely, a bank can have a stable long-term funding base and still face a near-term liquidity problem if sudden outflows exceed immediately available cash and liquid assets.
| Test | Main question |
|---|---|
| LCR | Can the bank survive a severe short-term liquidity stress with a stock of HQLA? |
| NSFR | Is the longer-horizon funding structure stable enough for the assets and commitments being financed? |
Short-term survival and structural funding are connected but not interchangeable.
The LCR starts with stressed cash outflows
The bank estimates how deposits, wholesale funding, derivatives, committed facilities and other obligations could behave during severe stress under the regulatory assumptions.
Some deposits are assumed to run off more slowly; others receive more conservative treatment. Certain committed facilities can be drawn. Some inflows are recognised but cannot simply be assumed to offset every outflow without limit.
The design deliberately asks the bank to survive while several ordinary assumptions are going wrong at once.
The HQLA numerator is a quality filter, not merely an asset total
The LCR does not allow the bank to count every asset at face value. Eligible high-quality liquid assets are subject to formal categories, haircuts and composition rules.
The logic is conservative: the asset should remain monetisable under stress, not merely valuable in ordinary conditions.
Read High-Quality Liquid Assets for the asset side of the test.
The NSFR asks how dependable the funding is
Different liabilities provide different degrees of stability. Equity and long-term liabilities are generally more stable than funding that matures quickly. Some retail deposits can receive more stable treatment than short-term wholesale funding because observed and contractual behaviour differs.
The bank therefore receives an available stable funding amount based on the composition and maturity of its funding sources.
The asset side receives a required stable funding weight
Cash and highly liquid short-term assets need relatively little stable funding support. Long-term loans, less-liquid assets and some off-balance-sheet commitments require more.
The NSFR therefore discourages a bank from financing a large stock of long-duration or illiquid assets with too much short-term unstable money.
It is a structural answer to the maturity-transformation problem described in Maturity Transformation.
A bank can improve the LCR without improving the NSFR much
Suppose a bank sells an illiquid asset and buys eligible HQLA. Its short-term liquidity buffer improves. But if the liability side still relies heavily on short-term funding, the structural funding weakness remains.
The balance sheet is more liquid without necessarily becoming more stably funded.
A bank can improve the NSFR without creating enough immediate liquidity
Now suppose the bank issues five-year debt to replace three-month borrowing. Funding stability improves substantially. But if it invests most of the proceeds into long-term loans and keeps very little HQLA, it can still be vulnerable to a sudden near-term outflow.
Stable funding gives more time. It does not eliminate the need for immediately monetisable assets.
A worked miniature
Bank A holds S$120 million of HQLA against S$100 million of modelled stressed net cash outflows. Its simplified LCR is 120 per cent.
But Bank A funds many long-term assets with short wholesale liabilities that mature repeatedly through the year. Its structural funding profile can still be weak.
Bank B has stable long-term funding but only a thin immediately liquid asset buffer. Bank B can look stronger structurally and weaker in the first stress month.
The two ratios force the analyst to see both banks more clearly.
Regulatory ratios are minimum architecture, not complete liquidity management
A bank can satisfy both ratios and still carry meaningful liquidity risk. Customer concentration, intraday settlement, currency mismatch, legal-entity restrictions, collateral encumbrance and market access can create problems not captured completely by one headline number.
That is why the Basel Committee also maintains broader liquidity risk management and supervision principles.
Ratios are guardrails. Treasury still has to drive the balance sheet.
Intraday liquidity sits inside the short-term problem
A bank can be liquid over thirty days and still face a problem at noon if a large payment must settle before incoming funds arrive.
Payment timing, collateral availability and central-bank balances therefore matter inside the broader regulatory framework.
This is one reason The Banking Liquidity Gap remains a separate operational concept.
Currency mismatch can make consolidated ratios look more comfortable than local reality
Liquidity held in Singapore dollars does not automatically meet US-dollar obligations without a conversion route. Foreign-exchange and swap markets can become expensive during stress.
Banks therefore monitor regulatory liquidity alongside currency-specific needs and transferability across legal entities.
Behavioural assumptions remain a critical model boundary
Liquidity standards assign prescribed treatment to funding categories, but real customer behaviour can still surprise. Technology can accelerate transfers. Competition can increase deposit sensitivity. Corporate treasurers can act collectively.
A bank should therefore test stresses beyond the regulatory minimum when its own funding profile has distinctive risks.
Why both ratios affect bank economics
Holding more HQLA can reduce average asset yield. Raising longer-term stable funding can cost more than short-term funding. These prudential choices therefore reduce some forms of apparent profitability.
That cost is intentional. The banking system accepts some lower short-term efficiency to reduce the probability that ordinary maturity transformation turns into a crisis.
The ratios create different management levers
| If the problem is… | Possible management response |
|---|---|
| Insufficient short-term liquidity buffer | Increase HQLA, reduce stressed outflows, improve collateral access |
| Too much short-term funding for long-lived assets | Lengthen funding, retain more stable deposits, reduce long-duration asset growth |
| Deposit concentration | Diversify customers and funding routes |
| Currency mismatch | Raise matching-currency funding and liquidity |
| Encumbered asset pool | Preserve more unencumbered liquid assets |
A headline ratio matters because it points to a balance-sheet mechanism that management can change.
Four misconceptions to remove
| Misconception | Better model |
|---|---|
| “The LCR proves a bank is liquid.” | It is an important short-term stress standard, not a complete description of every liquidity risk. |
| “The NSFR is another version of the LCR.” | It addresses structural funding stability over a longer horizon. |
| “A bank that passes both tests cannot face a liquidity crisis.” | Concentration, currency, intraday timing and market access can still create severe stress. |
| “Liquidity regulation only reduces profit.” | It deliberately buys resilience against the timing risks created by banking itself. |
A mastery test
- What question does the LCR answer?
- What question does the NSFR answer?
- Why can a bank be strong on one and weak on the other?
- Why are HQLA central to short-term survival?
- Why do regulatory ratios not replace internal liquidity management?
If those answers connect, multiple liquidity tests stop looking redundant. They become different windows onto the same bank: one asks whether it can survive the first hard month; the other asks whether it built the year on funding durable enough to deserve the assets it chose.