Duration Risk in Debt Funds: How It Moves NAV — SkimNews
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- Sanjiv Bajaj, Joint Chairman & Managing Director of BajajCapital Ltd, defined duration risk as the measure of how sensitive a bond or debt-fund portfolio is to interest-rate movements, noting bond prices and yields move in opposite directions.
- Modified duration works as a rule of thumb: a fund with a modified duration of four years could see roughly a 4% change in portfolio value for a 1 percentage-point move in yields (opposite direction), assuming other factors stay constant.
- Fund categories such as liquid, ultra-short, short-duration, medium-duration, dynamic bond, and gilt funds carry very different interest-rate exposures because their mandates and portfolio compositions differ, Bajaj said.
- Duration alone is insufficient, per Bajaj — credit quality, liquidity, portfolio composition, average maturity, yield-to-maturity, expense ratio, and exit load must also be assessed, since no single number captures a debt fund's full risk profile.
- Debt funds differ from fixed deposits: their NAV reflects the market value of underlying securities, which shifts with interest rates and market conditions rather than offering a locked-in rate.
- Investor alignment matters most — matching a fund's duration with one's own investment horizon and liquidity needs is how investors can better manage interim NAV fluctuations, according to Bajaj.
Why it matters: Investors who treat debt funds as bond-FD substitutes can be surprised by NAV drawdowns when rates shift. The piece arms retail investors with a framework — modified duration, credit quality, mandate-fit — to choose among liquid, gilt, or dynamic-bond funds without over-relying on any one metric.
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