Module XIII·Article V·~5 min read
Collateral Stress Testing
Collateral Management
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Collateral Stress Testing: Scenarios and Methodology
Collateral Stress Testing is the process of modeling the behavior of collateral in extreme market conditions. For the CIO, this is a critically important tool, enabling them to understand vulnerabilities of borrowing capacity and prepare contingency plans.
Objectives of Collateral Stress Testing
- Identify Vulnerabilities: Which positions are most vulnerable to margin calls
- Quantify Risks: How much additional collateral will be required in a crisis
- Test Covenants: Under what shock a covenant breach will occur
- Plan Liquidity: Is there enough liquidity for margin calls
- Optimize Structure: How to change the portfolio to increase resilience
Types of Stress Scenarios
| Type | Description | Examples | Application |
|---|---|---|---|
| Historical | Repetition of real crises | 2008 GFC, 2020 COVID, 2022 Rate Shock | Realistic, clear to stakeholders |
| Hypothetical | Theoretical scenarios | -30% equities + +200 bps rates | Tailored to specific risks |
| Reverse | What shock is needed for breach | At what drop does LTV > 60%? | Defining break-even points |
| Sensitivity | Change of one factor | Rates +/- 100 bps | Understanding individual drivers |
Historical Scenarios: Detailed Parameters
| Scenario | Equities | IG Bonds | HY Bonds | Treasuries | Gold | EM | Development Time |
|---|---|---|---|---|---|---|---|
| 2008 GFC | -57% | -10% | -30% | +15% | +5% | -65% | 18 months |
| 2008 Acute (Oct) | -27% | -8% | -20% | +5% | -10% | -35% | 1 month |
| 2020 COVID Crash | -34% | -5% | -15% | +8% | 0% | -30% | 1 month |
| 2020 March Liquidity | -12% | -10% | -22% | -5% | -12% | -20% | 2 weeks |
| 2022 Rate Shock | -25% | -15% | -12% | -18% | -5% | -20% | 9 months |
| Stagflation | -35% | -20% | -25% | -15% | +30% | -40% | Hypothetical |
Methodology for Calculating Stressed LTV
- Stressed Collateral Value $ = \Sigma (\text{Position Value} \times (1 + \text{Stress Shock})) $
- Stressed LTV $ = \frac{\text{Loan Amount}}{\text{Stressed Collateral Value}} $
- Margin Call Amount $ = \max(0, \text{Loan} - \text{Stressed Value} \times \text{Target LTV}) $
Portfolio Stress Test Example
| Asset | Value | 2008 Shock | Stressed Value |
|---|---|---|---|
| US Treasuries | $5,000,000 | +15% | $5,750,000 |
| IG Corporate Bonds | $3,000,000 | -10% | $2,700,000 |
| S&P 500 ETF | $8,000,000 | -57% | $3,440,000 |
| EM Equity ETF | $2,000,000 | -65% | $700,000 |
| Gold | $2,000,000 | +5% | $2,100,000 |
| Total | $20,000,000 | $14,690,000 | |
| Current Loan | $10,000,000 | ||
| Current LTV | 50% | ||
| Stressed LTV | 68% | ||
| LTV Covenant | 60% | ||
| Covenant Breach? | YES (+8 pp over limit) |
Reverse Stress Testing
Defining break-even points:
$ \text{Break-even Shock} = \frac{\text{Current LTV} - \text{Max LTV}}{\text{Portfolio Beta to Shock}} $
Reverse Stress Test Example
| Covenant | Limit | Current | Headroom | Break-even Shock |
|---|---|---|---|---|
| Max LTV | 60% | 50% | 10 pp | -20% portfolio |
| Min NAV | $100M | $140M | $40M | -29% portfolio |
| Min Liquidity | 20% | 25% | 5 pp | $10M margin call |
Correlation Stress Testing
In crises, correlations between assets increase. Stress test must take this into account:
| Asset Pair | Normal Correlation | Crisis Correlation | Diversification Benefit |
|---|---|---|---|
| US Equities / EM Equities | 0.70 | 0.95 | Minimal in crisis |
| US Equities / Treasuries | -0.20 | -0.50 to +0.30 | Variable |
| IG Bonds / HY Bonds | 0.60 | 0.85 | Reduced in crisis |
| Gold / Equities | 0.05 | -0.20 to +0.20 | Inconsistent |
Liquidity Stress Testing
Ability to satisfy margin calls:
| Scenario | Margin Call | Available Liquidity | Shortfall | Action Required |
|---|---|---|---|---|
| Base | $0 | $15M | $0 | None |
| Moderate Stress | $5M | $15M | $0 | Use cash buffer |
| Severe Stress | $12M | $15M | $0 | Near limit |
| Crisis | $20M | $15M | $5M | Sell assets or raise capital |
Haircut Stress Testing
In a crisis, lenders increase haircuts:
| Asset | Normal Haircut | Stressed Haircut | Borrowing Power Impact |
|---|---|---|---|
| Treasuries | 2% | 5% | -3% |
| IG Corporates | 10% | 20% | -10% |
| DM Equities | 30% | 50% | -20% |
| EM Equities | 45% | 70% | -25% |
| HY Bonds | 40% | 60% | -20% |
Comprehensive Stress Test Report Template
- Executive Summary: Key vulnerabilities and recommended actions
- Portfolio Composition: Current allocation and collateral quality
- Scenario Analysis: Results under each scenario
- Covenant Impact: Which covenants breach under each scenario
- Liquidity Analysis: Margin call capacity
- Action Plan: Contingency measures for each scenario
CIO Recommendations
- Regular cadence: Monthly stress tests, quarterly deep dives
- Board reporting: Summary results to Investment Committee
- Action triggers: Pre-defined actions upon reaching thresholds
- Scenario updates: Regularly update scenarios based on market conditions
- Document assumptions: All assumptions must be documented and challenged
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