A new lens for debt funds

Summary: Debt fund risk is quiet until it suddenly isn’t. This column explains why judging debt funds by returns alone is misleading, how hidden credit and concentration risks hurt investors, and why Value Research’s upgraded ratings now flag rising risk before losses appear.

For over three decades, Value Research's fund ratings have served as a starting point for investors. Over the years, I've watched investors use them to cut through the noise—and that remains their purpose. What has changed is the nature of risk in debt funds, and our ratings must reflect that reality.

Here's the problem with debt funds: risk doesn't announce itself the way it does in equity. When you invest in an equity fund, volatility is your constant companion. Markets swing, your portfolio value bounces around, and you learn to live with it. The risk is visible and frequent. In debt funds, the experience is entirely different. Returns accumulate steadily, the NAV climbs in neat increments, and everything feels reassuringly safe, until it doesn't.

Credit risk in debt funds stays hidden during benign periods. Losses, when they arrive, don't knock politely; they break down the door. A fund can look perfectly healthy for years, then a single credit event wipes out months or years of accumulated gains in days. This is precisely why judging debt funds by returns alone has always been inadequate, even dangerous.

Consider a scenario that has played out more than once in Indian markets. Two debt funds post similar returns over three years. An investor looking at the numbers might reasonably conclude they're equally good. But one fund achieved those returns through disciplined investing in high-quality paper, while the other took concentrated bets on lower-rated bonds. During good times, the second fund might even look superior; higher returns, same apparent stability. The risk was always there, just invisible.

The question that matters is not simply "how much did this fund return?" but rather "did this fund earn returns commensurate with the risk it took, or did it simply stretch into riskier territory?" This is the question our upgraded rating framework is designed to help you answer.

There's another trap that past returns cannot reveal: concentration risk. A debt fund might hold dozens of securities and appear well-diversified. But look closer, and you might find that a substantial portion of the portfolio is parked with a single corporate group or a handful of related issuers. The fund's factsheet shows many holdings; the underlying reality is a concentrated bet. Indian investors learned this lesson painfully during the IL&FS and DHFL episodes, when funds that seemed diversified on paper turned out to be dangerously exposed. The steady returns of previous years meant nothing once the concentration risk materialised.

From this month, credit quality and concentration will become explicit inputs in our debt fund ratings. Returns are now evaluated in the context of the credit risk taken to generate them. A fund that accumulates risk in its portfolio—through heavy exposure to lower-rated bonds or concentrated bets on individual issuers—will face rating caps, regardless of how impressive its returns might look. This means ratings respond to rising portfolio risks before those risks become your losses.

What does this mean in practice? You may find that some debt funds you considered highly rated no longer earn top marks. If a fund has been delivering stellar returns by quietly loading up on credit risk, it won't be rewarded with five stars simply because nothing has gone wrong yet. Conversely, a prudent fund with modest returns may stand out precisely because it earns those returns without stretching for risk.

There's another implication worth noting. When credit risk is elevated across a category, there may simply be no five-star or four-star fund available. The absence of top ratings in such situations is not a flaw in the methodology—it's information. It tells you that the category itself demands caution.

This upgrade carries a broader message, particularly for individual investors who have historically shied away from debt funds. Many individuals treat debt investing as something for corporates or treasury managers, defaulting instead to fixed deposits and small savings schemes. That's a missed opportunity. Debt funds, chosen wisely, can serve individual portfolios well—but only if investors can distinguish between funds that earn returns prudently and those chasing yield through hidden risk.

Our ratings have never been predictions, and that hasn't changed. They remain fully quantitative and rule-based. But they now do a better job of what they were always meant to do: highlight consistency, prudence and the avoidance of unpleasant surprises. In debt investing, that's precisely what matters most.

Also read: We've upgraded our debt fund ratings. Here's what to know