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Both index mutual funds and exchange-traded funds (ETFs) can track an index. The practical difference is how you buy and sell: an index mutual fund is transacted through mutual-fund channels at the applicable NAV, while an ETF trades on an exchange at a live market price. Choose by comparing the exact schemes’ costs and tracking, then consider trading access, demat requirements, liquidity and how you plan to invest—not the expense ratio alone.
How index mutual funds and ETFs differ
SEBI describes an index mutual fund as a scheme that holds all or most of the securities in its target index in similar proportions. An ETF is also a fund designed to track an index, but its units trade on an exchange. The fund wrapper does not itself guarantee that it will reproduce the index perfectly.
For an overview of the two structures, see SEBI’s index mutual fund explainer and ETF explainer.
How buying and selling works
Index mutual funds: transact at NAV
You place a mutual-fund purchase or redemption through a mutual-fund channel. For conventional mutual-fund transactions, NSE says units are purchased at the NAV published at the end of each trading day. The applicable NAV and transaction timing determine the price; you do not place an exchange order at a continuously changing quote.
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ETFs: place an exchange order
You buy or sell ETF units through an exchange during trading hours, using the market price available when your order executes. That price can differ from the ETF’s underlying NAV, so an exchange-traded price is not necessarily the same as the value of the portfolio at that moment. NSE compares the two transaction routes in its mutual funds and ETFs comparison; SEBI also explains ETF trading and pricing in its ETF explainer.
Compare the real cost, not just the TER
The total cost depends on the scheme and, for ETFs, on how you trade and hold the units. A scheme’s total expense ratio (TER) is an important recurring cost, but an ETF investor may also pay brokerage and applicable demat or account charges. Those charges depend on the investor’s broker and account terms, so there is no single all-in ETF cost that applies to everyone.
AMFI says scheme TER is disclosed daily. Check the current TER for each specific candidate on the AMFI TER page and the fund provider’s disclosures rather than relying on an old comparison. SEBI identifies brokerage and demat charges, where applicable, as additional ETF costs in its ETF explainer. AMFI also explains expense ratios.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsFor a fair comparison, estimate costs using your intended investment amount and trading frequency. A small or frequent ETF order can make transaction charges more relevant; a different broker or account arrangement may change the calculation. Do not assume that a lower TER automatically means the cheaper or better choice overall.
Check tracking over comparable periods
Tracking error measures how much a fund’s returns diverge from its benchmark’s returns. Tracking difference is a separate comparison of the fund’s return against the benchmark over a period. Expense ratio affects realized returns, but implementation and operational factors also matter; a lower stated fee alone does not establish better index replication.
Compare funds tracking the same index over comparable periods, and review both tracking error and tracking difference where disclosed. Use current AMC and AMFI scheme information. SEBI explains tracking error, and NSE provides an explanation of index tracking error. Avoid treating one period or one snapshot as proof that one structure always tracks better.
Access, automation and practical use
| Consideration | Index mutual fund | ETF |
|---|---|---|
| Transaction route | Mutual-fund channel; conventional transactions use the applicable NAV published at the end of the trading day. | Exchange order during trading hours at the market price when it executes. |
| Account and holding | Can be transacted through mutual-fund channels. | Units are held in demat mode; AMFI says ETF units are compulsorily held in demat mode. |
| Trading controls | Not bought or sold through intraday exchange orders. | Exchange execution offers intraday trading; market price can differ from NAV. |
| Investment workflow | May be easier to automate through mutual-fund channels, depending on the platform. | Requires exchange-trading access; SEBI notes that ETF units cannot be bought in fractional units. |
| Costs to check | Current scheme TER and any scheme-specific charges. | Current scheme TER, brokerage, and applicable demat or account charges. |
| Index tracking | Scheme-specific tracking error and tracking difference. | ETF-specific tracking error and tracking difference; market price may also differ from NAV. |
AMFI’s scheme information describes ETF demat holding. In practice, a mutual-fund route may suit someone who values a fund-based workflow, while an ETF may suit an investor who already uses exchange trading and wants intraday execution. Check the actual scheme’s liquidity, costs and tracking as well as the convenience of the accounts you already use.
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Tax depends on classification and the transaction
Do not infer a tax advantage from the index-fund or ETF label alone. The Income Tax Department’s ITR-2 FAQ states a 12-month long-term holding period for listed securities and units of equity-oriented mutual funds. Its ITR-2 filing guidance identifies Schedule 112A for sales of equity-oriented fund units on which STT is paid. These statements do not settle the tax treatment of every fund or transaction: scheme classification, holding period, transaction details and current law all matter. Verify the rules that apply to your circumstances.
Quick Recap
A practical way to choose
- Match the benchmark. Compare funds tracking the same index; otherwise, differences in holdings and performance are not an apples-to-apples comparison.
- Review current scheme data. Check each candidate’s current TER and tracking error or tracking difference over comparable periods using current AMC and AMFI disclosures.
- Calculate your all-in ETF costs. Add your actual brokerage and applicable demat or account charges to the ETF’s TER for your expected investment amount and frequency.
- Choose the transaction route that fits. Prefer NAV-based mutual-fund transactions if that workflow suits you; consider an ETF if you value exchange execution and already have the required access.
- Check operational details before investing. For an ETF, consider liquidity and the difference between its market price and NAV. For either route, confirm scheme details and the tax classification relevant to your transaction.
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