Credit risk vs. structural risk in CLOs
At a glance
- Credit risk originates at the loan level (defaults, deterioration, macro stress).
- Structural risk stems from CLO mechanics (waterfall, OC/IC tests, manager actions).
- Senior tranches rely heavily on structural protections; junior tranches absorb losses first.
- Monitoring requires both credit and structural metrics.
Overview
This note explains the difference between credit risk and structural risk in collateralized loan obligations (CLOs) and what investors in different tranches should monitor.
Key takeaways
- Credit and structural risks are distinct but interrelated.
- Structural protections mitigate—but do not eliminate—risk for senior tranches.
- Payment timing can be affected even without borrower defaults.
How it works
- Borrower defaults reduce portfolio value.
- Coverage ratios decline (OC / IC).
- Trigger breaches may divert cash flows.
- Structural protections activate to prioritize senior tranches.
- Manager actions influence recovery or deterioration.
Structural protections
- Subordination: Lower tranches absorb losses first.
- OC/IC tests: Protect senior tranches via cash diversion.
- Waterfall: Defines payment priority.
- Active management: Portfolio can be adjusted within constraints.
Implications & metrics (comparison tables)
Tranche implications
| Tranche | Primary risk exposure | Typical effect in stress |
|---|---|---|
| AAA | Structural risk dominant | Protected but may face payment timing changes |
| AA / A | Moderate credit + structural | Possible interruption under stress |
| BBB / BB | Higher credit exposure | Loss absorption and diversion likely |
| Equity | Full residual risk | First loss, last paid |
Key metrics to monitor
| Metric | Credit | Structural | Why it matters |
|---|---|---|---|
| WARF | Yes | No | Average credit quality |
| Default rate | Yes | No | Loss expectations |
| OC ratio | No | Yes | Coverage cushion |
| IC ratio | No | Yes | Interest protection |
| Market-value tests | No | Yes | Trigger risk independent of defaults |
Limitations, risks and considerations
- Credit and structural risks must both be evaluated.
- Structural protections are not absolute.
- Market value changes can trigger structural effects without defaults.
- Manager actions materially impact outcomes.
FAQs
Can a AAA tranche lose principal without defaults?
Uncommon, but possible in extreme structural stress scenarios.
Which metrics indicate near-term risk?
OC/IC ratios, cushions, and market-value test status.
How often should metrics be reviewed?
At least quarterly and after major market events.
Do market-value tests increase volatility?
Yes, they can trigger cash flow changes based on price moves rather than defaults.
Glossary
- Credit risk: Risk of borrower non-payment.
- Structural risk: Risk from CLO mechanics and rules.
- OC ratio: Collateral coverage vs liabilities.
- IC ratio: Interest coverage ability.
Author, disclosures and legal
Author: Investment Research Team