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Index Funds and Active Funds: The Difference
An index fund simply copies a market index, such as the Nifty 50 or Sensex. It holds the same stocks in the same proportions. There is no stock picking, so costs are low and the fund's return closely follows the index, minus a small difference called tracking error.
An active fund has a fund manager who chooses stocks to try to beat the index. You pay more for that research, and the result depends on the manager's skill and luck.
Neither Is Always Better
Index funds give you the market's return at low cost, reliably. Active funds give you a chance of beating the market, along with a real chance of lagging it. The right mix depends on the category and on you.
What the Data Says
S&P Dow Jones Indices publishes the SPIVA India scorecard, which compares active funds with their benchmarks. Its 2026 reports found that over 10 years, roughly three out of four large-cap active funds underperformed their benchmark index. Most mid/small-cap and ELSS funds also underperformed over 10 years.
Two lessons follow. First, beating the index consistently is hard, especially among large companies that every analyst already tracks. Second, a minority of active funds do beat their index, but picking them in advance is the hard part.
Why Costs Matter So Much
Example: ₹10 Lakh Invested for 20 Years
This assumes the underlying portfolio earns 12% a year before costs. It is an illustration, not a projection.
Expense ratio 0.2%: grows to about ₹93 lakh
Expense ratio 1.0%: grows to about ₹81 lakh
Expense ratio 1.6%: grows to about ₹72 lakh
A difference of about one percentage point a year compounds into a gap of more than ₹10 lakh. An active fund has to beat the index by at least its extra cost just to break even.
When Each Makes Sense
- Large-cap core: A low-cost Nifty 50 or Sensex index fund is a strong default here, given how hard large-cap indices are to beat.
- Mid and small caps: These markets are less closely tracked, and some active managers have added value here, but results vary widely between funds.
- Flexi-cap or multi-cap: Many investors use an active fund here for the manager's freedom to move across market sizes.
- A practical approach: Use index funds for the core and a few carefully chosen active funds around it, reviewed against their benchmark every year.
How to Choose an Index Fund
- Pick the index first: Nifty 50, Nifty Next 50, Nifty 500 and so on. The index decides most of the result.
- Compare expense ratios: They should be low, as you are paying only for tracking.
- Check tracking error and tracking difference: Lower means the fund follows its index more closely.
- Prefer reasonable fund size: Larger funds usually track their index better.
- Index fund or ETF? ETFs trade on the exchange like shares and need a demat account. Index funds are bought like any mutual fund and allow SIPs easily.
Common Mistakes to Avoid
Every year, put each active fund you own next to the index fund for its benchmark, over 3 and 5 years. If an active fund has lagged its index for several years without a clear reason, such as a manager change, that is a signal to review it. Don't keep holding it out of habit.
Frequently Asked Questions
Q: Are index funds good for SIPs?
Yes. A monthly SIP in a broad index fund is a simple, low-cost way to build long-term equity wealth.
Q: Do index funds pay the same tax as active equity funds?
Yes. Equity index funds are taxed like other equity funds: 20% on short-term gains, and 12.5% on long-term gains above ₹1.25 lakh a year.
Q: What is a smart-beta or factor index fund?
It follows an index built on rules, such as low volatility, momentum, quality or value, instead of company size. These funds sit between pure index and active investing, and can underperform the broad market for long periods.