Bond Duration
Name variants
- English
- Bond Duration
- Katakana
- デュレーション
- Kanji
- 債券
Quality / Updated / COI
- Quality
- Reviewed
- Updated
- Source
- Citations & Trust
- COI
- none
TL;DR
Bond duration helps manage interest rate risk by clarifying price sensitivity and the trade-offs between yield and volatility. It keeps scope and assumptions aligned.
Definition
Duration measures a bond's sensitivity to changes in interest rates based on the timing of cash flows. It specifies the unit of analysis and the assumptions behind rate sensitivity, including yield curve shifts and cash-flow timing. The concept separates what is in scope (coupon timing and maturity) from what is out of scope (credit risk changes), so comparisons stay consistent. Applied well, it turns a vague debate into a measurable choice and makes the drivers of results explicit.
Decision impact
- Use Bond Duration to decide portfolio interest rate exposure, because it exposes price sensitivity and the trade-off with yield versus volatility.
- It changes budgeting and prioritization by making yield curve shifts and cash-flow timing explicit and reviewable.
- It informs adjustments when rate expectations change, so the decision stays grounded in current conditions.
Key takeaways
- Define the unit and time horizon before comparing duration across options.
- Track the primary driver (duration in years) separately from secondary noise.
- Run sensitivity checks on yield changes and convexity to avoid false precision.
- Document data sources and calculation steps so results are auditable.
- Revisit duration targets when the business model or market context changes.
Misconceptions
- Duration is not the same as maturity; coupons affect sensitivity.
- Higher yield does not always compensate for higher duration risk.
- Duration does not capture credit risk or liquidity risk.
Worked example
A pension fund expects rate hikes and shortens portfolio duration from seven to three years. It models price sensitivity under parallel rate shifts and checks yield impact. The analysis shows acceptable income with lower volatility, so the shift is executed. After implementation, the fund monitors duration as the curve changes.
Citations & Trust
- Principles of Finance (OpenStax)