Index Funds vs ETFs

What Is the Difference Between Index Funds and ETFs?

Both index funds and exchange-traded funds (ETFs) are passive mutual fund schemes that aim to replicate a market index, such as a broad equity index or a bond index, instead of trying to beat it. The main difference is how you buy and sell them:

• An index fund is bought from and sold back to the fund house (AMC) at the day's Net Asset Value (NAV), like any regular mutual fund.
• An ETF is listed on a stock exchange. You buy and sell its units through a stockbroker at the market price, which changes throughout the trading day.

Under the Securities and Exchange Board of India's (SEBI) categorisation circular of 26 February 2026, both fall under "Other Schemes – Index Funds/ETFs", which must invest at least 95% of total assets in the securities of the index being replicated or tracked.

How Do They Work?

Index fund

1. You place a purchase or redemption request with the AMC, an RTA, a distributor or an online platform.
2. You get units at the applicable NAV, based on SEBI's cut-off time rules for the day.
3. The fund invests in the index constituents in the same proportion as the index.
4. Redemption proceeds come from the AMC, within the timelines set by SEBI.

ETF

1. You buy or sell units on the stock exchange through a broker, using a demat and trading account.
2. The price is set by demand and supply, and usually stays close to the ETF's NAV because of market makers and arbitrage.
3. SEBI requires AMCs to appoint at least two market makers for ETFs to provide continuous liquidity, and an indicative NAV (iNAV) is published during market hours.
4. Direct dealing with the AMC is allowed for investors only for transactions above ₹25 crore (this threshold does not apply to market makers).
5. Liquidity window: If an ETF trades at a discount of more than 1% to NAV for 7 continuous trading days, has no quotes for 3 consecutive trading days, or has very thin bid sizes, SEBI allows investors to redeem directly with the AMC (up to ₹25 crore) without exit load.

Practical Example (Illustrative)

Rohan wants to invest ₹1,00,000 tracking the same equity index for one year. Assume (hypothetically):

In this illustration, the ETF's lower expense ratio is outweighed by trading and account costs for a small investor. For a larger amount, or an investor who already pays for a demat account, the comparison can tilt the other way. Always use your own costs.

Why Is It Important?

• Convenience: Index funds suit SIPs and investors without demat accounts; ETFs suit investors comfortable with exchange trading.
• Costs: ETFs often have lower expense ratios, but trading costs, bid-ask spreads and demat charges add up.
• Pricing: Index funds transact at a single NAV per day; ETFs trade at changing market prices, which may be above or below NAV.
• Liquidity: An ETF's liquidity depends on exchange trading volumes; an index fund's liquidity comes from the AMC.

Key Features

Benefits and Limitations

Index funds

• Benefits: easy SIPs, no demat needed, no bid-ask spread, transactions at NAV.
• Limitations: only one price per day; expense ratio may be slightly higher than a comparable ETF; possible exit load.

ETFs

• Benefits: intraday trading, often very low expense ratio, real-time pricing, can be used with limit orders.
• Limitations: need demat and trading accounts; brokerage and spreads; may trade at a premium or discount to NAV; low-volume ETFs can be hard to trade at fair prices.

Index Funds vs ETFs vs Related Concepts

How Does It Apply to Mutual Fund Investors?

• Selecting a scheme: Compare the index tracked, expense ratio, tracking error and tracking difference. For ETFs, also check trading volumes and the bid-ask spread.
• SIP vs lump sum: Index funds make SIPs simple. ETF investors may need to place regular orders or use a broker's periodic buy facility.
• Placing ETF orders: Using limit orders and trading during active market hours can help reduce the impact of spreads.
• Taxation (check current rules): Tax depends on what the fund holds, not whether it is an index fund or ETF. Equity index funds and ETFs that invest at least 65% in domestic equity are equity-oriented: for transfers on or after 23 July 2024, short-term gains (held 12 months or less) are taxed at 20%, and long-term gains above ₹1.25 lakh a year are taxed at 12.5%. Debt index funds and ETFs investing more than 65% in debt are "specified mutual funds", with gains on units bought on or after 1 April 2023 taxed at slab rates. Gold and silver ETFs follow separate rules. The Income-tax Act, 2025 applies from 1 April 2026; confirm with a tax adviser.

Common Mistakes and Misconceptions

1. "ETFs are always cheaper than index funds." Correct understanding: ETF expense ratios are often lower, but brokerage, spreads and demat charges can make total costs higher for small investors. Why it matters: Compare total costs, not just the expense ratio.

2. "I can buy an ETF at its NAV." Correct understanding: On the exchange, you pay the market price, which can be above or below NAV. Why it matters: Buying at a premium or selling at a discount reduces returns.

3. "Index funds and ETFs exactly match the index." Correct understanding: Expenses, cash holdings and timing cause tracking error and tracking difference. Why it matters: Lower tracking difference means returns closer to the index.

4. "Any ETF can be sold instantly at a fair price." Correct understanding: Liquidity depends on trading volumes and market makers; thinly traded ETFs can have wide spreads. Why it matters: Check volumes before investing larger amounts.

5. "Index funds and ETFs are taxed differently because of their structure." Correct understanding: Tax depends mainly on the underlying assets (equity, debt, gold), with holding period rules differing for listed and unlisted units in some cases. Why it matters: Choose based on convenience and cost, then check the tax rules for that asset class.

Important Terms to Know

• Index Funds: Mutual funds that replicate an index and transact at NAV. Related glossary topic.
• Exchange-Traded Funds (ETFs): Index-tracking funds traded on exchanges. Related glossary topic.
• Tracking Error: How much a fund's returns vary from its index. Related glossary topic.
• Benchmark Index: The index a fund tracks or is compared with. Related glossary topic.
• Expense Ratio: The annual fee charged by a fund. Related glossary topic.
• Cut-Off Time and Applicable NAV: Rules that decide which day's NAV applies to your transaction. Related glossary topic.
• Active vs Passive Funds: The difference between managed and index-tracking funds. Related glossary topic.

Key Takeaways

• Index funds and ETFs both replicate an index and must invest at least 95% in index securities under SEBI's rules.
• Index funds transact with the AMC at NAV; ETFs trade on exchanges at market prices.
• ETFs often have lower expense ratios but add brokerage, spreads and demat costs.
• SEBI provides ETF safeguards such as market makers, iNAV and a liquidity window.
• Tax depends on the underlying assets, not the structure; check current rules.

Related Glossary Terms

• Index Funds
• Exchange-Traded Funds (ETFs)
• Active vs Passive Funds
• Tracking Error
• Target Maturity Funds
• Gold ETFs
• Fund of Funds vs Feeder Funds

References

• SEBI, Circular on Categorization and Rationalization of Mutual Fund Schemes, 26 February 2026
• SEBI, Master Circular for Mutual Funds, 20 March 2026
• AMFI, Tax Regime for Mutual Funds

Disclaimer

This content is for educational and informational purposes only and is not personalised investment, tax or legal advice. Mutual fund investments are subject to market risks; read all scheme-related documents carefully. Consult a qualified tax adviser for tax matters. Investment decisions should consider your financial goals, risk profile and the relevant scheme documents.

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