Duration Gap
Name variants
- English
- Duration Gap
- Katakana
- デュレーション・ギャップ
Quality / Updated / COI
- Quality
- Reviewed
- Updated
- Source
- Citations & Trust
- COI
- none
TL;DR
Duration Gap tracks the difference between asset duration and liability duration weighted by balance sizes to help teams hedge rate exposure and rebalance duration while managing the interest-rate risk reduction versus hedging cost tradeoff. It turns complex signals into a shared decision threshold.
Definition
Duration Gap is a balance-sheet risk measure that compares the interest-rate sensitivity of assets and liabilities. It is typically measured by the difference between asset duration and liability duration weighted by balance sizes and is used to hedge rate exposure and rebalance duration. The concept makes the interest-rate risk reduction versus hedging cost tradeoff explicit and supports policy or operational thresholds across planning, stress testing, and review cycles. Teams document assumptions, data sources, and update cadence so results remain comparable over time.
Decision impact
- Sets guardrails for hedge rate exposure and rebalance duration by interpreting the difference between asset duration and liability duration weighted by balance sizes under scenario analysis and stress tests.
- Signals when to adjust strategy because the interest-rate risk reduction versus hedging cost balance is shifting in current conditions.
- Aligns stakeholders by turning Duration Gap into a shared threshold for approvals and periodic reviews.
Key takeaways
- Define calculation windows and inputs for Duration Gap before comparing periods or peers.
- Track leading indicators that move the difference between asset duration and liability duration weighted by balance sizes so decisions are proactive, not reactive.
- Pair Duration Gap with qualitative context to avoid one-number overconfidence.
- Use triggers and escalation paths so hedge rate exposure and rebalance duration changes happen on time.
- Revisit assumptions when business mix, regulation, or market conditions shift.
Misconceptions
- Duration Gap is a fixed target; in practice, thresholds depend on risk tolerance and context.
- Improving Duration Gap always means better performance; it can hide costs or tradeoffs.
- One snapshot is enough; trends and volatility often matter more for decisions.
Worked example
Example: A bank expects a steepening yield curve and reviews its duration mismatch. The team calculates the difference between asset duration and liability duration weighted by balance sizes, compares it to an internal threshold, and discusses the interest-rate risk reduction versus hedging cost implications. They decide to hedge rate exposure and rebalance duration with staged actions, document assumptions and data sources, and set a trigger for revisiting the decision. Over the next quarter, they monitor the metric alongside leading indicators and adjust the plan once the trigger is hit.
Citations & Trust
- Bank for International Settlements (BIS)