What is the difference?
An index fund holds the stocks of a market index, such as the Nifty 50, in the same proportions, and so returns what the index returns, minus a small cost. There is no manager picking stocks, which is why it is also called a passive fund.
An active fund has a fund manager who chooses stocks to try to beat the index. The research and decisions cost money, so its expense ratio is higher. The fund only helps you if the manager’s picks add more return than that extra cost.
Index fund: low fee, market return, very close to the index. Active fund: higher fee, a chance to beat the index, and an equal chance to lag it.
Real comparison: Nifty 50 index funds vs large cap funds
The fairest comparison is funds aimed at the same market segment. Here are 25 direct-plan Nifty 50 index funds against 35 actively managed large cap funds.
CHART
Average direct-plan expense ratio (%)
Simple average across funds in each group, from the Punji fund database.
| Measure | Nifty 50 index funds | Large cap active funds |
|---|---|---|
| Number of funds | 25 | 35 |
| Average expense ratio | 0.30% | 1.16% |
| Average 3Y rolling CAGR | 12.88% | 14.81% |
| Average 3Y standard deviation | 12.24% | 13.03% |
| Average % of windows beating benchmark | 26.4% | 73.3% |
What the numbers say
Cost. Active large cap funds charge 0.85 percentage points more a year on average. On ₹10,00,000 that is about ₹3,050 a year for the index fund against ₹11,550 for the active fund, a gap of ₹8,500. This is the one number you know in advance.
Returns. The active group shows a higher average 3-year rolling CAGR, by 1.93 points. Read this carefully: the index funds here have shorter histories on average, so their rolling windows cover different market periods, and the active group only includes funds that survived. It is not a clean verdict for either side.
Beating the benchmark. Index funds beat their benchmark in only 26.4% of rolling windows, and that is expected: an index fund can at best match its index, and its fee and tracking error pull it slightly below. Active funds beat theirs in 73.3% of windows on average, a higher share, though averages hide funds that did much worse.
Risk. Standard deviation is close for both groups, 12.24% against 13.03%, which is what you would expect when both invest in the same large companies.
How to choose
The question to ask of an active fund is whether its alpha clears its higher expense ratio, consistently, over several windows. An index fund needs no such test: you accept the market return and keep more of it. An active fund with a very low active share is close to an expensive index fund. Many investors combine the two, using index funds for the core of the portfolio and active funds where they expect a manager to add value.
WHAT THIS MEANS FOR YOU Do not choose on a single average. Averages across a category hide the spread between the best and worst fund, and past outperformance does not repeat on schedule. Compare a specific active fund against its own benchmark over several windows and ask whether it earned its fee.
METHODOLOGY Simple averages across direct-plan funds as of 2026-10-25, from the Punji fund database (D1 funds_v2, direct plans). Nifty 50 index funds are those with Nifty 50 in the scheme name (excluding Next 50); returns use each fund’s 3-year rolling CAGR, which only covers funds with enough history (17 of 25 index funds and 30 of 35 active funds). Not investment advice.