How to Compare Two Mutual Funds Side by Side
Investors often compare mutual funds by lining up their trailing returns and picking whichever number is bigger. This approach skips over the factors that actually determine whether a fund is a reasonable fit for a portfolio — the category it belongs to, what it costs, who runs it, and how much risk it took to generate that return. Here is a more structured way to place two funds side by side.
This guide is educational and does not constitute investment advice. Fund selection depends on an individual's goals, time horizon, and risk appetite, and is best discussed with a certified financial advisor.
Why Comparing Across Categories Is Misleading
The single most common mistake in fund comparison is placing two funds from different categories next to each other simply because both are equity funds. A large cap fund and a small cap fund, for instance, are built to behave differently. Large cap funds invest in the biggest, most established companies, which tend to be more stable but grow more slowly. Small cap funds invest in smaller, less established companies that can post far higher returns in a rallying market — and far steeper losses in a falling one.
For example, if a small cap fund posted a noticeably higher one-year return than a large cap fund, that gap does not necessarily mean the small cap fund was better managed. It may simply reflect the fact that small cap stocks as a group had a strong year. The correct comparison is always within the same category — large cap against large cap, flexi cap against flexi cap, or one debt fund against another debt fund with a similar maturity profile. Comparing across categories tells you about market conditions, not about fund quality.
Factor 1: Expense Ratio
Once two funds are confirmed to be in the same category, the expense ratio is one of the few variables an investor can know in advance with certainty, because it is disclosed upfront and deducted automatically regardless of how the fund performs. A fund with a lower expense ratio starts every year with a smaller drag on returns than a costlier peer. Over short periods this difference looks trivial. Over long periods, it compounds meaningfully — a topic covered in more depth in the guide on mutual fund expense ratios.
Factor 2: AUM Stability
Assets Under Management (AUM) reflects how much investor money a fund manages. A single snapshot of AUM is less useful than its trend. A fund whose AUM has been steadily rising suggests investors are staying invested and new money continues to come in. A fund whose AUM is shrinking month after month, even while markets are flat or rising, can indicate that existing investors are redeeming — which is worth investigating before assuming the fund is a safe long-term choice. For very small cap or thinly traded strategies, a sudden inflow of AUM can also force a manager to change how the portfolio is built, since there may not be enough liquid opportunities to deploy new money the same way.
Factor 3: Fund Manager Tenure
A fund's historical returns belong to whoever managed it during that period, not to the fund itself. If a fund shows an impressive five-year track record but the current manager only took over eight months ago, that track record says little about what to expect going forward. When comparing two funds, check how long the current manager (or management team) has actually been running each one, and treat returns generated before their tenure as background context rather than a direct reflection of their skill.
Factor 4: NAV Return Over Matched Periods
When comparing returns, make sure the time periods actually match — one-year return against one-year return, three-year against three-year, and so on — and be careful with funds that were launched at different times, since a fund started right before a market rally will show a flattering return that has nothing to do with manager skill. It is also worth looking at rolling returns (how the fund performed across many overlapping periods) rather than a single point-in-time figure, since a single number can be skewed by one unusually good or bad stretch.
Factor 5: Holdings Overlap
Two funds can look completely different on paper — different names, different fact sheets, different AMCs — and still hold largely the same underlying stocks. This is common among funds in the same category, since there is often a limited pool of large, liquid companies that qualify. If an investor already holds one fund and is comparing a second one as a potential addition, checking the overlap in underlying holdings matters more than comparing headline returns, because a high overlap means the second fund adds cost without adding meaningful diversification. This is exactly what WhoHolds' fund comparison toolis built to surface — it lines up two funds' actual portfolios, expense ratios, and category data side by side, so the comparison is grounded in what each fund actually owns rather than just the number on its factsheet.
Why a Lower Expense Ratio Compounds Into Real Money
To see why cost matters even when two funds report similar gross performance, consider a hypothetical example. Suppose two large cap funds, Fund A and Fund B, both generate an identical gross return of 12% per year before fees over a 20-year holding period. Fund A has an expense ratio of 0.8%, while Fund B has an expense ratio of 1.8% — a 1 percentage point difference. An investor who puts a lump sum of ₹5,00,000 into each fund would end up with a materially larger balance in Fund A after 20 years purely because a smaller slice of the return was deducted each year, and that saved slice was left to compound alongside the rest of the investment. The two funds performed identically at the portfolio level; only the fee eroded one investor's outcome more than the other's. This is why expense ratio deserves as much attention as past returns when the choice is between two funds in the same category with broadly similar strategies.
Putting It Together
A reasonable comparison checklist, in order, looks like this: confirm both funds sit in the same category, compare expense ratios, check AUM trend over the last several months, note how long the current manager has been in charge, compare NAV returns over matched time periods, and finally check how much the two portfolios overlap in their actual holdings. Skipping straight to the returns column and ignoring the rest is the most common way investors end up disappointed by a fund that looked good on the surface.
Frequently Asked Questions
- Can I compare a large cap fund with a flexi cap fund?
- You can look at both, but treat it as comparing two different strategies rather than a head-to-head contest. A flexi cap fund can move across market capitalizations, so its return profile and risk will differ structurally from a large cap fund even if both are equity funds.
- Is a higher expense ratio ever justified?
- Some actively managed funds, particularly in less-covered segments like small caps, charge more because of the research effort involved. Whether that cost is worth it depends on whether the fund has consistently delivered enough extra return, after fees, to justify it — not on the fee alone.
- How much holdings overlap is considered high?
- There is no fixed threshold that applies universally, since it depends on the category and the number of investable stocks available. As a general principle, the higher the overlap between two funds, the less diversification benefit an investor gets from holding both.
- Should I switch funds based on one bad year?
- A single year of underperformance within the same category is not unusual and can reflect normal market cycles rather than a flaw in the fund. Comparing rolling returns over multiple periods, alongside the other factors in this guide, gives a more complete picture than reacting to one year in isolation.