Debt Mutual Funds: How They Work, Types, and Key Considerations

Interest rates and bond prices move in opposite directions. When rates fall, existing bonds that pay higher interest become more valuable, so bond prices rise and NAV goes up. When rates rise, those same bonds become less attractive, prices fall, and NAV can decline.

Funds with longer duration are more sensitive to these movements. A fund holding 10-year bonds will see larger NAV swings than one holding 90-day instruments. This is why the category structure of debt funds matters so much: your risk exposure is largely determined by the duration of the portfolio you choose.

Credit quality is the second driver. Bonds carry ratings that indicate the issuer's ability to repay. Higher-rated instruments like sovereign bonds and AAA-rated corporate debt carry lower credit risk. Lower-rated instruments offer higher potential yield in exchange for higher risk

Both are taxed at slab rate under current rules. The key structural difference is that debt fund returns are market-linked while fixed deposit returns are locked in at the time of booking.

For investments made on or after April 1, 2023, gains from debt mutual funds are taxed at your applicable income slab rate regardless of how long you hold. There is no indexation benefit. For investments made before April 1, 2023, long-term capital gains treatment may still apply. Verify the purchase date before assuming slab-rate taxation applies.