What a debt fund actually holds

A debt fund invests in bonds and similar instruments — which are, in effect, loans that pay interest. Instead of owning a slice of companies as an equity fund does, a debt fund lends money to governments, companies and banks and collects the interest. It is often thought of as the “safe” kind of fund, and that word is where the trouble starts.

What it actually holds

The holdings are debt instruments: government bonds, corporate bonds, and short-term paper issued by companies and banks, among others. Each is a promise to pay interest over a period and return the principal at the end. A debt fund holds many such instruments at once, and its value is the combined value of all of them, priced day by day like any other fund.

How it earns — and how it can lose

A debt fund’s value moves for two reasons: the interest its holdings pay, which tends to accrue steadily, and changes in the market price of those holdings, which do not. That second part is the one people forget. The prices of bonds move, and when they move down, the fund’s value moves down with them. Two forces drive those price moves, and they are the whole reason debt funds are not a single uniform thing.

Interest-rate risk

Interest-rate risk is the risk that changes in market interest rates move the value of a bond. When prevailing rates rise, an existing bond paying the old, lower rate becomes less attractive, so its market price falls — and a fund holding it falls too. When rates fall, the reverse happens. The longer the period a bond has left to run — its duration — the more its price swings for a given change in rates. This is why a long-duration debt fund can move surprisingly much.

Credit risk

Credit risk is the risk that a borrower does not pay as promised. If a company whose bond a fund holds is downgraded or fails to pay, the value of that holding can drop sharply, and the fund with it. Lending to the most creditworthy borrowers carries less of this risk; reaching for extra interest by lending to weaker ones carries more. Credit risk tends to bite suddenly rather than gradually, which is what makes it easy to underestimate in calm periods.

Steadier is not the same as safe

A debt fund is generally less volatile than an equity fund, and for many that is the point. But “less volatile” is not “safe”: a debt fund carries both interest-rate risk and credit risk, its value is not promised, and it can and does fall. It is not a fixed deposit — the differences are set out in SIP or a fixed deposit. Treating a debt fund as free of risk is the single most common mistake made about this whole category.

Why there are so many debt categories

Debt funds are split into many categories precisely because they carry these two risks in different amounts — some hold very short-term paper and barely move, others hold long government bonds and swing with rates, others lend to lower-rated borrowers. The category names describe where a fund sits on those two risks, which is what the rest of this cluster and the scheme document spell out. The categories are descriptions, not a ranking.