Leverage Ratio, LCR, and NSFR
In Lessons 6 and 7, you built the risk-weighted capital framework: capital stack, deductions, three ratios, SA risk weights, IRB models, and the output floor. All of those ratios share a fundamental design choice -- they weight assets by risk. This lesson covers the three Basel measures that do not rely on risk weights, or that measure a completely different dimension of bank resilience: the ability to survive short-term and long-term funding stress.
The 2007-08 financial crisis demonstrated that a bank can report strong risk-weighted capital ratios and still fail. Northern Rock reported a Tier 1 ratio above 10% in 2006, yet it collapsed in September 2007 because it could not fund its assets when wholesale markets froze. Its balance sheet was 75x leveraged in absolute terms, and it had almost no liquid asset buffer. Basel III responded with three new measures: the leverage ratio (a non-risk-weighted capital backstop), the Liquidity Coverage Ratio (a 30-day stress survival test), and the Net Stable Funding Ratio (a 1-year structural funding requirement).
The Leverage Ratio
The leverage ratio strips out risk-weighting entirely:
Leverage Ratio = Tier 1 Capital / Total Exposure Measure
| Component | What It Includes |
|---|---|
| Numerator | Tier 1 capital (CET1 + AT1) -- same as for the Tier 1 capital ratio |
| Denominator | Total on-balance-sheet assets + derivative exposures + securities financing transactions (SFTs) + off-balance-sheet items (at 100% CCF or regulatory CCF) |
The minimum is 3.0% under the Basel standard. The UK PRA sets a higher minimum of 3.25% for deposit-takers with more than GBP 75 billion in retail deposits (revised from GBP 50 billion in PS22/25, November 2025), and excludes central bank reserves from the denominator.
A bank that holds GBP 50 billion in sovereign bonds (0% risk weight) and GBP 5 billion in corporate loans (100% risk weight) has RWA of only GBP 5 billion. If its CET1 is GBP 750 million, its CET1 ratio is 15% -- well above the minimum. But its leverage ratio is 750M / 55B = 1.36% -- dangerously low. The bank is funding GBP 55 billion of assets with only GBP 750 million of loss-absorbing capital. The leverage ratio catches this concentration in low-risk-weight assets that risk-weighted ratios miss.
Assets a bank can sell for cash within 30 days at little or no loss of value -- the numerator of the Liquidity Coverage Ratio.
A bank holding GBP 500M in central bank reserves (Level 1, 0% haircut) and GBP 100M in covered bonds (Level 2A, 15% haircut) has HQLA = GBP 500M + GBP 85M = GBP 585M.
HQLA is the bank's survival buffer -- if depositors and wholesale lenders demand their money back simultaneously, HQLA is the cash the bank can produce without selling illiquid assets at fire-sale prices.
The Liquidity Coverage Ratio (LCR)
The LCR asks: if the bank faces a severe 30-day liquidity stress -- deposit withdrawals, wholesale funding freeze, credit line drawdowns -- does it hold enough liquid assets to survive without external support?
LCR = Stock of HQLA / Total Net Cash Outflows over 30 Days ≥ 100%
HQLA Classification
Not all liquid assets qualify equally. Basel classifies them into three levels:
| Level | Assets | Haircut | Cap |
|---|---|---|---|
| Level 1 | Cash, central bank reserves, qualifying sovereign bonds (0% risk weight) | 0% | No cap |
| Level 2A | Sovereign bonds (20% risk weight), qualifying covered bonds, investment-grade corporate bonds | 15% | Combined Level 2 capped at 40% of total HQLA |
| Level 2B | Lower-rated corporate bonds, qualifying equities, qualifying RMBS | 25-50% | Level 2B capped at 15% of total HQLA |
Haircuts reduce the counted value to account for potential price decline during the stress period. A GBP 100M covered bond with a 15% haircut counts as GBP 85M of HQLA.
Net Cash Outflows
Net cash outflows are calculated by applying run-off rates to each funding category:
| Outflow Category | Run-Off Rate |
|---|---|
| Retail deposits -- stable (insured, primary relationship) | 3-5% |
| Retail deposits -- less stable | 10% |
| Wholesale deposits -- non-financial corporates | 25% |
| Wholesale deposits -- financial institutions | 100% |
| Undrawn committed facilities | 5-30% (varies by counterparty) |
| Secured funding (repo) -- Level 1 collateral | 0% |
| Secured funding (repo) -- other collateral | 15-100% |
Total net outflows = Total outflows - min(Total inflows, 75% of total outflows)
The 75% cap on inflows ensures the bank cannot rely entirely on expected inflows to meet the ratio.
Exercise 4: Liquidity Stress Test
Calculate the LCR for a UK bank facing a 30-day stress scenario.
HQLA Portfolio:
| Asset | Amount (GBP M) | HQLA Level | Haircut | HQLA Value (GBP M) |
|---|---|---|---|---|
| Central bank reserves | 420 | Level 1 | 0% | 420.0 |
| UK government bonds | 380 | Level 1 | 0% | 380.0 |
| Qualifying covered bonds (AAA) | 95 | Level 2A | 15% | 80.75 |
| Investment-grade corporate bonds | 60 | Level 2A | 15% | 51.0 |
| Total HQLA | 931.75 |
Cash Outflows:
| Category | Balance (GBP M) | Run-Off Rate | Outflow (GBP M) |
|---|---|---|---|
| Retail deposits -- stable | 2,800 | 3% | 84.0 |
| Retail deposits -- less stable | 480 | 10% | 48.0 |
| Wholesale non-financial | 320 | 25% | 80.0 |
| Wholesale financial | 190 | 100% | 190.0 |
| Undrawn committed lines | 150 | 10% | 15.0 |
| SPV liquidity facilities | 45 | 100% | 45.0 |
| Total Outflows | 462.0 |
Cash Inflows:
| Category | Amount (GBP M) | Inflow Rate | Inflow (GBP M) |
|---|---|---|---|
| Maturing interbank lending | 85 | 100% | 85.0 |
| Retail loan repayments | 35 | 50% | 17.5 |
| Total Inflows | 102.5 |
Your tasks:
- Verify the HQLA calculation (check the Level 2 cap: is combined Level 2 ≤ 40% of total HQLA?)
- Calculate total net cash outflows (apply the 75% inflow cap)
- Calculate the LCR
- Does the bank meet the 100% minimum?
Step 1 -- Level 2 Cap Check: Level 2A: 80.75 + 51.0 = 131.75 Level 2B: 0 Total HQLA before cap: 931.75 Level 2 as % of total: 131.75 / 931.75 = 14.1% -- well below the 40% cap. No adjustment needed.
Step 2 -- Net Cash Outflows: Total outflows: GBP 462.0M Total inflows: GBP 102.5M 75% cap on inflows: 75% x 462.0 = 346.5M (inflows of 102.5 are below the cap, so full inflows count) Net outflows: 462.0 - 102.5 = GBP 359.5M
Step 3 -- LCR: LCR = 931.75 / 359.5 = 259.2%
Step 4 -- Assessment: The bank exceeds the 100% minimum with substantial headroom. It could survive a 30-day stress with its liquid asset buffer alone, even without the expected inflows.
The Net Stable Funding Ratio (NSFR)
While LCR measures short-term survival (30 days), the NSFR measures structural funding resilience over a 1-year horizon:
NSFR = Available Stable Funding (ASF) / Required Stable Funding (RSF) ≥ 100%
| ASF Component | ASF Factor |
|---|---|
| Tier 1 and Tier 2 capital | 100% |
| Stable retail deposits (insured) | 95% |
| Less stable retail deposits | 90% |
| Wholesale funding > 1 year maturity | 100% |
| Wholesale funding 6-12 months | 50% |
| Wholesale funding < 6 months | 0% |
| RSF Component | RSF Factor |
|---|---|
| Cash, central bank reserves | 0% |
| Sovereign bonds (0% risk weight) | 5% |
| Corporate bonds and equities | 50% |
| Residential mortgages (risk weight ≤ 35%) | 65% |
| Retail loans | 85% |
| All other assets | 100% |
The NSFR ensures that a bank funding 30-year mortgages has enough long-term or stable funding to match those long-dated assets, rather than relying on short-term wholesale markets that can evaporate in a crisis.
A bank can pass LCR (plenty of liquid assets for 30 days) but fail NSFR (funding long-term assets with short-term debt). Conversely, a bank with perfectly matched funding (high NSFR) could fail LCR if its liquid asset buffer is insufficient. The two ratios together ensure both short-term resilience and structural soundness.
Using the Banking Plugin
The liquidity-lcr and liquidity-nsfr skills classify HQLA, calculate net cash outflows under stress, and compute both liquidity ratios. Here is a worked example.
Worked example. Nadia Petrova, Treasury Risk Manager at Northern Bridge Bank, needs to calculate LCR under a 30-day stress scenario after a large deposit outflow. She types:
Calculate LCR for this position:
HQLA:
Central bank reserves: GBP 420M (Level 1)
UK gilts: GBP 380M (Level 1)
AAA covered bonds: GBP 95M (Level 2A)
IG corporate bonds: GBP 60M (Level 2A)
Outflows (30-day stress):
Stable retail deposits GBP 2,800M at 3%
Less stable retail GBP 480M at 10%
Wholesale non-financial GBP 320M at 25%
Wholesale financial GBP 190M at 100%
Undrawn committed lines GBP 150M at 10%
SPV facilities GBP 45M at 100%
Inflows:
Maturing interbank GBP 85M at 100%
Retail loan repayments GBP 35M at 50%
Jurisdiction: UK PRA
The agent routes through liquidity-lcr and responds:
GOVERNING STANDARD: Basel III — UK PRA
DOMAIN: Liquidity Coverage Ratio
JURISDICTION: United Kingdom — PRA Rulebook / UK CRR
HQLA (after haircuts)
Level 1: GBP 800.0M (420 + 380, no haircut)
Level 2A: GBP 131.75M (95 x 85% + 60 x 85%)
Level 2 cap check: 131.75 / 931.75 = 14.1% (below 40% cap)
Total HQLA: GBP 931.75M
NET CASH OUTFLOWS
Total outflows: GBP 462.0M
Total inflows: GBP 102.5M
Inflow cap (75% of outflows): GBP 346.5M
Inflows within cap: GBP 102.5M (applied in full)
Net outflows: GBP 359.5M
LCR = GBP 931.75M / GBP 359.5M = 259.2%
Minimum: 100%
Status: PASS — substantial headroom
NOTE: The professional reviews the HQLA classifications
and run-off rate assumptions; the agent calculated the
haircuts, cap checks, and final LCR.
Nadia reviews whether the covered bonds genuinely qualify at Level 2A (AAA-rated, meeting the covered bond directive criteria) and confirms that the run-off rates applied to wholesale financial deposits reflect her bank's PRA-agreed assumptions.
A bank's own internal assessment of how much capital (ICAAP) and liquidity (ILAAP) it needs to survive severe stress -- submitted annually to the regulator, who can then set higher requirements.
If the Basel minimum CET1 is 8.0% but a bank's ICAAP stress test shows it needs 11.5% to survive a severe recession, the regulator may set the bank's individual capital requirement at 11.5%.
ICAAP and ILAAP are the bridge between generic regulatory minimums and bank-specific risk profiles -- they are why two banks with identical balance sheets can have different capital requirements.
Jurisdiction Variant: US (CECL and DFAST)
US banks operate under a different but parallel framework. Instead of IFRS 9's three-stage ECL model, US banks provision under CECL (ASC 326), which requires lifetime expected loss estimation from Day 1 for all assets -- there is no Stage 1 / 12-month ECL concept. On the stress testing side, US banks with $250 billion or more in total consolidated assets are subject to mandatory stress testing under the Dodd-Frank Act Stress Testing (DFAST) framework administered by the Federal Reserve (the threshold was raised from $10 billion by the Economic Growth, Regulatory Relief, and Consumer Protection Act of 2018; the Federal Reserve retains discretion to apply enhanced standards to firms between $100 billion and $250 billion). DFAST requires banks to project capital ratios, pre-provision net revenue, and losses over a 9-quarter stress horizon under supervisory scenarios (severely adverse, adverse, and baseline) published annually. The DFAST results are publicly disclosed, creating market discipline that does not exist in the UK's ICAAP process (which is confidential between the bank and the PRA). Additionally, the largest US banks are subject to the Comprehensive Capital Analysis and Review (CCAR), which evaluates both quantitative capital adequacy and qualitative risk management practices including capital planning governance.
Try With AI
Use these prompts in Claude or your preferred AI assistant to deepen your understanding of leverage and liquidity requirements.
Prompt 1: HQLA Classification Practice
I am learning the Basel III Liquidity Coverage Ratio. Classify
each of these assets as HQLA Level 1, Level 2A, Level 2B, or
NOT HQLA, and state the applicable haircut:
1. GBP 500M in Bank of England reserves
2. GBP 200M in UK gilts (AAA-rated sovereign bonds)
3. GBP 150M in German Bunds (AAA-rated)
4. GBP 80M in AAA-rated covered bonds (pfandbriefe)
5. GBP 60M in AA-rated corporate bonds
6. GBP 40M in qualifying equities (major index)
7. GBP 30M in residential mortgage-backed securities (AA-rated)
8. GBP 100M in commercial property
9. GBP 25M in gold
For each, explain WHY it qualifies at that level.
Then calculate total HQLA after haircuts and check whether
the Level 2 caps are breached.
What you are learning: HQLA classification requires understanding what makes an asset "liquid" in a crisis. Central bank reserves are the ultimate liquid asset (Level 1, no haircut) because they are already cash at the central bank. Commercial property is not HQLA because you cannot sell a building in 30 days at fair value. This classification logic is critical for AI agents that compute liquidity ratios from a bank's balance sheet.
Prompt 2: Capital vs Liquidity Failure
Northern Rock (UK, 2007) had a Tier 1 capital ratio above 10%
but collapsed due to a liquidity crisis. Silicon Valley Bank
(US, 2023) had a CET1 ratio of approximately 12% but failed
when depositors withdrew $42 billion in one day.
For each bank:
1. What was the proximate cause of failure?
2. Which Basel III ratio (capital, leverage, LCR, NSFR) would
have flagged the vulnerability BEFORE the crisis?
3. What specific HQLA or funding structure weakness existed?
4. How would an AI agent monitoring these ratios daily have
provided early warning?
Then generalise: what is the relationship between capital
adequacy and liquidity? Can a bank be well-capitalised
but illiquid? Can it be liquid but undercapitalised?
What you are learning: Capital and liquidity are independent dimensions of bank resilience. A bank can fail from either one. Understanding this distinction is essential for building AI agents in the banking domain -- an agent that reports only capital ratios gives a dangerously incomplete picture. The strongest banking agents monitor all four dimensions (CET1, leverage, LCR, NSFR) simultaneously.
Prompt 3: NSFR Structural Analysis
A bank funds GBP 10 billion in 25-year residential mortgages
primarily with:
- GBP 2 billion in equity and long-term debt (> 1 year)
- GBP 3 billion in stable retail deposits
- GBP 5 billion in wholesale funding (3-6 month term)
Calculate:
1. The approximate Available Stable Funding (ASF)
2. The approximate Required Stable Funding (RSF) for mortgages
3. The NSFR
4. Does this bank pass the 100% minimum?
5. If not, what structural change would fix it?
Explain why regulators are concerned about banks that fund
long-term mortgages with short-term wholesale money.
What you are learning: The NSFR reveals maturity mismatch -- the fundamental banking risk that has caused failures for centuries. By computing it yourself, you internalise why a bank cannot safely fund 25-year mortgages with 3-month wholesale deposits, regardless of how profitable the carry trade might be. This structural understanding is what separates a competent banking AI agent from a simple ratio calculator.