How does a bank conduct liquidity stress testing, and what are the key scenarios?

Question

AcadiFi · Accepted Answer

Liquidity stress testing is a critical FRM Part II topic and a regulatory requirement under Basel III and most national supervisory frameworks. The process simulates how a bank's liquidity position would evolve under adverse conditions, ensuring it can survive without central bank emergency support.

```mermaid
graph TD
  A[1. Define Stress Scenarios] --> B[2. Model Cash Outflows]
  B --> C[3. Model Cash Inflows & Asset Monetization]
  C --> D[4. Calculate Net Liquidity Position]
  D --> E{Survival Horizon >= Minimum?}
  E -->|Yes - Adequate| F[6. Report Results to ALCO & Board]
  E -->|No - Shortfall| G[5. Develop Contingency Funding Plan]
  G --> F
  F --> H[7. Integrate into Risk Appetite & Limits]
  H -->|Feedback| A
  A --> A1[Idiosyncratic: Rating downgrade, deposit run]
  A --> A2[Market-Wide: Credit crunch, interbank freeze]
  A --> A3[Combined: Firm-specific + systemic shock]
  style A fill:#c9a84c,color:#0a0a0f
  style E fill:#1e3a5f,color:#fff
  style G fill:#8b2020,color:#fff
  style F fill:#1a3c2a,color:#fff
```

**Step 1 — Define Stress Scenarios:**

Banks typically model three scenario types:

| Scenario Type | Description | Example |
|---|---|---|
| Idiosyncratic | Firm-specific shock, no market disruption | Ridgeline Bank is downgraded from A to BBB, triggering CSA collateral calls and deposit outflows |
| Market-wide | Systemic shock affecting all institutions | Interbank lending freezes, repo haircuts double, asset prices drop 20% |
| Combined | Simultaneous firm and market stress | Ridgeline is downgraded during a market crisis — the worst case |

**Step 2 — Model Cash Outflows:**

For Ridgeline Bank under the combined stress scenario:

| Outflow Category | Normal (Monthly) | Stressed (30-Day) |
|---|---|---|
| Retail deposit runoff | $120M (1.5%) | $400M (5.0%) |
| Wholesale funding non-renewal | $0 | $2,800M (100% of maturing) |
| Derivatives collateral calls | $50M | $650M |
| Credit line drawdowns | $80M | $1,200M (60% of commitments) |
| Secured funding haircut increases | $0 | $350M |
| **Total stressed outflows** | **$250M** | **$5,400M** |

**Step 3 — Model Inflows & Asset Monetization:**

| Inflow/Asset Source | Amount Realizable (30 days) | Haircut Applied |
|---|---|---|
| Maturing loans (contractual) | $800M | 25% delayed |
| Government bond sales | $1,600M | 5% market impact |
| Central bank eligible collateral | $1,200M | 10% haircut |
| Corporate bond sales | $400M | 15% market impact |
| **Total available liquidity** | **$3,640M** | |

**Step 4 — Calculate Net Position:**
Net 30-day liquidity position = $3,640M - $5,400M = **($1,760M) shortfall**

Survival horizon: Ridgeline runs out of liquidity by **Day 18** under the combined stress scenario.

**Step 5 — Contingency Funding Plan (CFP):**
The CFP identifies additional liquidity sources to close the gap:
- Emergency asset sales (reduce trading book by $800M)
- Activate committed credit facility ($500M from consortium)
- Increase retail deposit pricing to slow runoff ($300M retention)
- Central bank discount window as last resort

**Connection to LCR and NSFR:**
- **LCR (Liquidity Coverage Ratio)** = HQLA / 30-day net cash outflows >= 100%. This is the regulatory minimum stress test.
- **NSFR (Net Stable Funding Ratio)** = Available stable funding / Required stable funding >= 100%. This addresses structural funding maturity mismatch over 1 year.
- Internal stress tests should be more severe than LCR because LCR uses standardized runoff assumptions, while internal models can capture firm-specific vulnerabilities.

**Exam Tip:** The FRM exam frequently tests whether candidates understand that LCR is a minimum regulatory standard, not a sufficient stress test. A bank can have LCR well above 100% and still face liquidity problems under more extreme scenarios.

For comprehensive liquidity risk coverage, explore our FRM Part II course on AcadiFi.

How does a bank conduct liquidity stress testing, and what are the key scenarios?

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