Why does an early retirement provision lower risk tolerance but high turnover does not — both reduce liabilities, right?

Question

AcadiFi · Accepted Answer

**Short answer:** they reduce DIFFERENT THINGS. Early retirement reduces the DURATION of liabilities (cash flows shift earlier in time), which directly drives the risk-tolerance question. Higher turnover reduces the SIZE of the PBO (some employees never vest), but does not necessarily change WHEN the remaining benefits get paid. The LM5 risk-tolerance question is specifically about duration, not dollar size.

### The two distinct effects

```mermaid
flowchart TD
    A[Workforce/plan changes] --> B{Which dimension changes?}
    B -->|Timing of benefit cash flows| C[Affects DURATION → risk tolerance]
    B -->|Dollar amount of total benefits| D[Affects PBO size → funded ratio]
    C --> E[Early retirement: cash flows EARLIER → shorter D → lower risk tolerance]
    C --> F[COLA: cash flows LATER and BIGGER → longer D → higher risk tolerance]
    D --> G[Turnover: fewer people vest → smaller PBO]
    D --> H[Vesting cliff: more people retain entitlements → bigger PBO]
    style E fill:#0d6e3a,color:#ffffff
    style F fill:#c9a84c,color:#0a0a0f
    style G fill:#16213e,color:#ffffff
    style H fill:#16213e,color:#ffffff
```

### Why duration matters for risk tolerance

Risk tolerance scales with the time available to ride out volatility:

- **Long duration** (15-20 years until peak liability payments) → can absorb a bad year, equity-heavy allocation OK
- **Short duration** (5-7 years until peak payments) → less room to absorb drawdowns, needs more fixed income

Pulling cash flows EARLIER means you need more LIQUIDITY SOONER → less ability to hold volatile assets → lower risk tolerance.

### Why turnover affects PBO size, not duration

Suppose a plan has 1,000 employees. The PBO depends on:
1. How many employees will eventually vest and receive benefits
2. The expected dollar amount per vested employee
3. The timing of those payments

High turnover reduces #1 (fewer employees stick around to vest) → smaller PBO. But it does NOT systematically shift WHEN the remaining vested employees receive their benefits. The remaining vested employees still retire at age 65 with their accrued entitlements.

There is a SECOND-ORDER effect: high turnover could mean the average tenure of remaining employees is shorter (the long-tenured employees aren't leaving), which slightly LENGTHENS duration. But that is small and not the focus of the LM5 question.

### The exam-day decision rule

```mermaid
flowchart TD
    A[Question asks about risk tolerance change] --> B{What is the cause?}
    B -->|Plan design change| C{Cash flow timing changes?}
    C -->|Earlier| D[Lower risk tolerance: early retirement, lump-sum]
    C -->|Later or larger future| E[Higher risk tolerance: deferred benefits]
    B -->|Workforce change| F{Active-retired balance changes?}
    F -->|More retirees| G[Lower risk tolerance: shorter duration]
    F -->|More actives| H[Higher risk tolerance: longer duration]
    B -->|Turnover change| I{Funded ratio or duration?}
    I -->|Funded ratio: yes; duration: not directly| J[Affects FUNDED STATUS not DURATION]
    style D fill:#0d6e3a,color:#ffffff
    style G fill:#0d6e3a,color:#ffffff
    style J fill:#c9a84c,color:#0a0a0f
```

### Memory hook

**DURATION moves SHORTER when CASH FLOWS move EARLIER**.

- Early retirement = earlier cash flows = shorter duration
- Lump-sum option = single early cash flow = much shorter duration
- COLA = larger LATER cash flows = longer duration
- Turnover = fewer cash flows of the SAME timing = smaller PBO, same duration

For the full risk-objective framework see our [DB pension risk article](/knowledge/db-pension-plan-risk-considerations-five-dimensions-cfa-level-3).

Why does an early retirement provision lower risk tolerance but high turnover does not — both reduce liabilities, right?

The two distinct effects

Why duration matters for risk tolerance

Why turnover affects PBO size, not duration

The exam-day decision rule

Memory hook

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