The Repo Rate–Bond Price Relationship
When the RBI cuts the repo rate, existing bonds with higher coupons become more valuable. Their prices rise in the secondary market, pushing up the NAV of debt mutual funds holding these bonds. This is the inverse relationship between interest rates and bond prices that every debt investor must understand.
Which Debt Fund Categories Benefit Most?
The longer the duration of the fund's bonds, the greater the impact of rate cuts on NAV:
| Fund Category | Duration | Benefit from Rate Cut |
|---|---|---|
| Liquid Funds | < 91 days | Minimal |
| Short Duration | 1–3 years | Moderate |
| Medium Duration | 3–4 years | Good |
| Long Duration | > 7 years | Maximum |
| Gilt Funds | 10–30 years | Highest |
Positioning Your Debt Portfolio
In an easing rate cycle, shift allocation toward longer-duration debt funds. Reduce exposure to short-term FDs and liquid funds. Gilt funds and long-duration bond funds can deliver 10–14% returns in a single year of aggressive rate cuts.
However, if the rate cycle reverses, long-duration funds can lose 5–10% in NAV rapidly. Always match fund duration to your investment horizon.
FD vs Debt Fund in a Rate Cut Environment
When rates are falling, existing FD holders are protected (locked-in rates). But new FD rates fall quickly. Debt funds with longer duration bonds capture the price appreciation that FDs miss entirely.
A 25 bps repo rate cut typically adds 1.5–2% to the NAV of a long-duration gilt fund in the short term.