A debt fund is a mutual fund that invests primarily in fixed-income instruments: government securities, corporate bonds, treasury bills, commercial paper and debentures. Returns come from two sources: the interest (coupon) earned on the holdings and changes in the market price of the bonds themselves.
Why people invest in debt funds
- Lower volatility than equity. A debt fund does not swing 10-15% in a month the way equity can.
- Better liquidity than a fixed deposit. You can redeem most debt funds within one to two working days, without the premature withdrawal penalty of an FD.
- Variety of risk-return profiles. From overnight funds that hold one-day papers to long-duration funds that bet on falling interest rates, debt funds cover a wide range.
Types of debt funds
| Category | Typical holding maturity | Risk level |
|---|---|---|
| Overnight fund | 1 day | Very low |
| Liquid fund | Up to 91 days | Low |
| Ultra-short / low-duration | 3-12 months | Low to moderate |
| Short-duration | 1-3 years | Moderate |
| Medium / long-duration | 3-7+ years | Higher |
| Gilt fund | Government securities, various | Interest-rate sensitive |
| Credit-risk fund | Lower-rated corporate bonds | Higher credit risk |
How interest rates affect debt funds
Bond prices move inversely to interest rates. When the RBI cuts rates, existing bonds with higher coupons become more valuable, and the fund's NAV rises. When rates rise, bond prices fall and the NAV dips. Longer-duration funds are more sensitive to this effect than short-duration ones.
This is the single most important concept in debt investing. If you park money in a long-duration fund just before a rate-hiking cycle, you can suffer meaningful losses, even though the fund holds "safe" bonds.
Credit risk: the other dimension
A corporate bond fund yielding more than a government bond fund is not offering a gift. The extra yield compensates for the risk that the issuer might default. When an NBFC or a corporate issuer is downgraded, the bonds it issued lose market value instantly, and every fund holding those bonds sees its NAV drop.
The safest debt funds hold only government securities or the highest-rated corporate papers. Higher-yield credit-risk funds can fall sharply and should not be treated as FD substitutes.
Taxation from FY 2023-24
Gains on debt funds held for any duration are now taxed at your income tax slab rate. The earlier distinction between short-term and long-term capital gains, with indexation benefit for holdings beyond three years, was removed for most debt funds purchased from 1 April 2023 onwards. This makes the post-tax comparison with FDs much closer than it used to be.
When to use debt funds
- As part of asset allocation, to provide stability alongside equity holdings.
- For goals one to three years away where equity is too volatile.
- To hold surplus cash through a liquid fund or STP.
- For emergency fund parking.
Compare potential returns against guaranteed FD rates using our FD calculator.