How to Benchmark Your Mutual Funds and Why Most Fail the Test

TL;DR Around 90% of actively managed mutual funds underperform their benchmark index over the long term. Use a broad index like the Nifty 500 as your yardstick, compare performance over at least five years, and switch to low-cost index funds when your active fund consistently falls short.

Most Funds Do Not Beat the Market

This is the uncomfortable truth you need to confront first. Globally, roughly 90% of active funds trail their benchmark index over a 10-year horizon. SPIVA reports confirm this repeatedly, and the Indian market is no exception.

The problem is that many investors look only at absolute returns. "12% per year sounds good, right?" But if the benchmark returned 15% over the same period, your fund lagged by 3 percentage points. Factor in fees, and the gap widens further.

Why You Need a Benchmark

A benchmark is the only objective reference point for judging whether your fund is actually performing well.

Absolute returns alone cannot distinguish between a rising tide lifting all boats and genuine managerial skill. In a year when the broad market climbs 20%, a fund returning 15% is not delivering performance—it is delivering opportunity cost.

My recommendation for the broadest benchmark is the Nifty 500 index. It spans large-cap to small-cap, making it a fair comparison for most diversified equity funds. For large-cap-only funds, use the Nifty 50. For mid/small-cap funds, the Nifty Midcap 150. But always have at least one reference point.

Evaluation Period: Minimum 5 Years, Ideally 10

Judging a fund by one-year returns is like evaluating a student by a single exam.

Markets run in cycles, and certain investment styles dominate for several years before underperforming for the next few. Value-oriented funds lagged significantly behind growth funds in 2020–2021, yet the situation reversed in 2022–2023.

A genuinely skilled fund is one that outperforms or at least matches its benchmark through various market environments. Five years is the minimum; a 10-year track record provides far greater confidence.

Consistency Is Everything

Given a choice between a fund that beat the benchmark in one out of three years and a fund that stayed close to or slightly above it all three years, take the latter.

Consistency signals that the fund manager operates with a systematic philosophy. A fund that delivers +10% versus the market one year and -8% the next is likely relying on luck rather than process. High volatility in relative performance is a red flag.

Rolling returns are a powerful tool here. Unlike point-to-point comparisons, they show you performance across every possible 3-year or 5-year window, removing the bias of your specific start date.

If It Cannot Beat the Benchmark, Go Passive

The conclusion is brutally straightforward.

If your fund has consistently underperformed its benchmark for five or more years, there is no rational reason to hold it. Switching to an index fund that tracks the same benchmark gives you lower fees and market-average returns as a guaranteed floor.

In the Indian market, Nifty 500 index funds typically charge an expense ratio of 0.1–0.3%, compared to 1–2% for active funds. Compounded over 10 to 20 years, this fee differential can mean millions of rupees in your final portfolio value.

FAQ

Q: Should I keep a fund that only recently started underperforming? A: If it has not trailed the benchmark for three to five consecutive years, it may be worth holding. One or two years of underperformance can reflect natural market cycle rotations. However, if there has been a fund manager change or a large increase in assets under management, reassess regardless.

Q: Can I compare against multiple benchmarks? A: Yes, and in fact I recommend it. Comparing a large-cap fund against both the Nifty 50 and the Nifty 500 gives you a more precise sense of its relative standing. Just make sure the benchmarks match the fund's investment universe—an irrelevant benchmark comparison tells you nothing.

Q: Index fund or ETF—which is better? A: For systematic monthly investments (SIPs), index funds are more convenient. For lump-sum investments or if you want the lowest possible expense ratio, ETFs have the edge. The key point is that both are passive strategies with a structural cost advantage over active management.