What is dynamic asset-liability management, and how does it differ from a static LDI approach?

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AcadiFi · Accepted Answer

Dynamic asset-liability management (dynamic ALM) adapts the portfolio's risk posture in response to changing market conditions, funded status, and liability characteristics — in contrast to static LDI, which sets a fixed allocation and rebalances to it periodically. **Static vs. Dynamic LDI** | Feature | Static LDI | Dynamic ALM | |---|---|---| | Allocation | Fixed LHP/RSP split (e.g., 60/40) | LHP/RSP split adjusts based on triggers | | Rebalancing | Calendar-based (quarterly) | Event-driven (funded ratio, rates, spreads) | | Risk budget | Constant | Varies with funded status | | Glide path | Pre-set, linear | Non-linear, accelerates near full funding | | Decision framework | Policy statement | Decision rules + optimization engine | **Dynamic ALM Decision Framework** The dynamic approach defines **trigger points** and **response rules**: **Worked Example — Crestview Corporate Pension:** Current state: Funded ratio 92%, Liability duration 14.0 years. | Trigger | Condition | Response | |---|---|---| | Funded ratio ≥ 95% | Surplus improves materially | Shift 10% from RSP to LHP | | Funded ratio ≥ 100% | Fully funded | Shift 20% from RSP to LHP | | Funded ratio ≤ 85% | Significant deterioration | Increase RSP by 5% (controlled risk-on) | | 30-year yield > 5.5% | Rates attractive for locking in | Extend LHP duration by 1.5 years | | Credit spreads > 250 bps | Cheap corporate bonds | Increase LHP allocation to long corporates | | Equity drawdown > 15% | Market stress | Review RSP, consider defensive rebalancing | \`\`\`mermaid flowchart TD A["Monitor:
Funded Ratio, Rates, Spreads"] --> B{"Trigger
Activated?"} B -->|"Funded Ratio ≥ 95%"| C["De-Risk: Shift
10% RSP → LHP"] B -->|"Funded Ratio ≤ 85%"| D["Controlled Risk-On:
+5% RSP"] B -->|"30yr Yield > 5.5%"| E["Lock In Duration:
Extend LHP +1.5yr"] B -->|"Spreads > 250bps"| F["Opportunistic:
Add Long Corporates"] B -->|"No Trigger"| G["Maintain Current
Allocation"] C --> H["Update Glide Path
& Hedge Ratio"] D --> H E --> H F --> H \`\`\` **Why Dynamic Beats Static:** 1. **Captures opportunities** — When rates spike, a dynamic approach locks in favorable hedging levels immediately, rather than waiting for the next quarterly review. 2. **Prevents overshoot** — If the funded ratio improves rapidly, static LDI may leave too much in the RSP, risking a reversal. Dynamic ALM de-risks quickly. 3. **Manages drawdowns** — During equity market stress, dynamic ALM can limit losses by triggering defensive shifts before the next calendar rebalance. 4. **Non-linear glide path** — The urgency to de-risk is not constant. Near full funding, every percentage point matters more — dynamic ALM accelerates the shift. **Implementation Challenges:** - Requires real-time or daily monitoring infrastructure. - Transaction costs from more frequent rebalancing must be managed. - Governance must pre-authorize trigger-based actions; investment committees may resist delegating authority. - Model risk — triggers based on incorrect market views can lock in poor allocations. **Best Practices:** - Define triggers in the investment policy statement before they are needed. - Use partial rebalancing (e.g., shift 5% per trigger, not 20%) to avoid overreaction. - Back-test the trigger framework against historical funded ratio paths. - Maintain a governance framework where the investment committee reviews trigger actions monthly. Explore advanced ALM strategies in our CFA Level III fixed income course.

What is dynamic asset-liability management, and how does it differ from a static LDI approach?

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