Chapter 9 of 15
Index Funds vs Active Funds
When index funds win, when active managers add value.
Parun had been back in India for about six months when the question started bothering him.
In Munich, he'd had a simple system: 40% of every paycheck went into a global index ETF. No thinking, no picking stocks, no fund manager research. Just: market does what the market does, expense ratio 0.07%, and you move on with your life.
Now he was looking at Indian mutual fund apps. Active funds everywhere. A Nifty 50 index fund with 0.1% expense ratio. And an "XYZ Multicap Growth Opportunities Fund" with a 1.8% expense ratio run by someone named Raghunath who has "25 years of market experience."
The question: Is Raghunath worth 1.7% per year extra?
An index fund passively replicates a market index (like Nifty 50 or Sensex) by buying all the stocks in the index in the same proportion. No fund manager picks stocks, the fund simply mirrors the index.
What Actively Managed Funds Are Promising You
An active fund manager says: "I will study the market, research companies, time sectors, and pick stocks that will outperform the index. My skill will make your money grow faster than the Nifty 50."
For this service, they charge you an expense ratio, typically 1–2% per year.
An index fund says: "We will buy every stock in the Nifty 50 in exact proportion and not do anything clever. Expense ratio: 0.1%."
The question is: does the active manager's skill actually compensate for the higher fee?
The Data: What SPIVA India Says
SPIVA (S&P Indices Versus Active) publishes a report comparing active funds against their benchmark indices. India data from recent years:
- Over 5 years: ~60–70% of large-cap active funds underperformed the Nifty 50
- Over 10 years: ~80–85% of large-cap active funds underperformed
- Over 15 years: ~90%+ underperformed
The longer the time period, the worse active funds look relative to the index.
The same phenomenon plays out globally. In the US, 90%+ of active large-cap funds underperform the S&P 500 over 15 years. Parun knows this from his Munich days. India's market is somewhat less efficient (there's more alpha to be found in smaller companies), but the large-cap category still shows the same pattern.
Why Does Active Management Underperform?
The fee drag is brutal. If the market returns 12% and the active fund charges 1.8%, the fund needs to generate 13.8% in gross returns just to match an index fund at 12%. Every year. Without fail. That's very, very hard.
It's a zero-sum game. For every active manager who outperforms the market, there's one who underperforms it. The market is all active and passive funds together. In aggregate, active funds earn the market return minus fees. Index funds earn the market return minus tiny fees.
Survivorship bias. The funds that underperformed badly don't exist anymore, they got merged or shut. So when you look at the "average active fund," you're looking at survivors. The actual average including dead funds is even worse.
Manager turnover. The Raghunath who generated great returns from 2015–2020 may leave. His replacement may not have the same edge. You're betting on a person, and people change.
Parun has ₹40 lakh to invest. He's comparing:
Option A: Nifty 50 index fund, 12% gross return, 0.1% expense ratio → 11.9% net return Option B: Active large-cap fund, 12% gross return, 1.8% expense ratio → 10.2% net return
(Assume both generate identical gross returns for simplicity, in reality, 80% of active funds generate LESS gross return too)
After 20 years: Index fund: ₹40L × (1.119)^20 = ~₹3.45 crore Active fund: ₹40L × (1.102)^20 = ~₹2.78 crore
Difference: ₹67 lakh. For literally doing nothing differently except paying a lower fee.
And this assumed the active fund matched the index gross return, which most don't.
Where Active Funds Can Still Win
Parun isn't dogmatic. He knows the data, but he also knows its limits.
Mid cap and small cap space: These markets are less researched. A skilled fund manager with deep company access can genuinely find undervalued companies before the index includes them. The alpha opportunity is real here. SPIVA data shows smaller proportions of mid/small cap active funds underperform in India vs large cap.
Sectoral expertise: A focused technology or healthcare fund managed by someone with genuine sector knowledge can outperform a broad index in that sector.
Flexi cap during transitions: A smart fund manager can shift from large to mid cap when mid caps are cheap. Index funds can't do this.
| Factor | Index Fund | Active Fund |
|---|---|---|
| Expense ratio | 0.05–0.2% | 0.5–2% |
| Stock selection | Automatic (follows index) | Fund manager decides |
| Performance (large cap) | Beats 80%+ active over 10 yr | Underperforms index mostly |
| Performance (mid/small cap) | Competitive | Some active funds add real value |
| Manager risk | None (no manager to leave) | High (manager change can hurt) |
| Transparency | Complete (same as index) | Monthly portfolio disclosure |
| Emotional decision-making | None | Can hurt in panic/euphoria |
Parun's India Portfolio Decision
Parun thought about this the way he thought about engineering tradeoffs: what's the evidence, what are the assumptions, and what's the downside of being wrong?
For large cap: index fund wins on data. Clear decision.
For mid cap: some active funds have demonstrated consistent outperformance. He chose a mid-cap active fund with 10+ year track record and consistent alpha generation, accepting the higher expense ratio.
For small cap: even more active fund potential, but higher manager risk. He chose 50% index (Nifty Smallcap 250) + 50% active small cap fund.
Don't compare a fund to its index at one specific date. Rolling returns show you how the fund performed against the benchmark over every rolling 3-year or 5-year period in its history. A fund that beats the index 80% of rolling periods is genuinely good. One that beats it in cherry-picked periods may just have gotten lucky.
ETFs vs Index Mutual Funds: A Note for Parun
In Germany, Parun invested in ETFs, exchange-traded funds that track indices, bought and sold on the stock exchange like stocks.
India also has ETFs. The key differences:
Index Mutual Fund: Buy/sell at end-of-day NAV. More convenient for SIP. No demat account needed.
ETF: Buy/sell any time during market hours at live price. Slightly lower expense ratio in some cases. Needs demat account. Liquidity can be an issue in smaller ETFs.
For monthly SIP investing, index mutual funds are more convenient. For lump sum investing with demat access, ETFs can be marginally better. Parun uses both, index funds for SIP, ETFs for lump-sum deployments.
The Counter-Argument: What Active Fund Supporters Say
Parun has had this conversation many times.
"But XYZ fund gave 22% last year!" Last year means nothing. Show me 15-year rolling returns vs benchmark.
"My relationship manager at the bank recommended this active fund." Your RM earns commission on regular plans. Ask them what their compensation structure is.
"Markets are inefficient in India. There's alpha to be found." True in mid/small cap. Not meaningfully true in large cap. Pick your battles.
"Active funds protect better in crashes." Sometimes. Sometimes not. The data isn't consistent on this across all active funds.
Key Takeaways
- Over 10+ years, 80–85% of active large-cap funds underperform the Nifty 50 index after fees
- The main reason: expense ratio drag. A 1.7% fee difference is enormous at compounding scale
- Mid cap and small cap active funds have a better case: markets are less efficient there
- Index funds eliminate manager risk, survivorship bias, and behavioral fund manager errors
- ETFs and index mutual funds both track the index: index MFs are easier for SIP, ETFs for lump sum
- Parun's approach: index funds for large cap, selective active funds for mid/small cap
Compare index funds vs active funds with real numbers:
- Portfolio construction: how Parun built his ₹40L portfolio
- Reading a fund factsheet: how to check alpha, beta, Sharpe ratio
- Try the SIP Calculator to project index fund returns
Parun's index fund earns 11.9% net (after 0.1% expense ratio). An active fund earns 10.2% net (after 1.8% expense). Both start with ₹10 lakh. What's the difference after 20 years?
Disclaimer: This article is for educational purposes only and does not constitute personalized financial advice. Investments are subject to market risks. Past performance does not guarantee future returns. Please consult a SEBI-registered investment adviser before making investment decisions.