ETF vs Index Fund — The Difference Is How You Buy It

An index fund is a mutual fund scheme. You place a purchase request, it is processed at the applicable NAV, and units are recorded against your PAN in a folio. Redemption works the same way in reverse. No demat account, no broker, no exchange.

An ETF is listed. You buy it through a broker on an exchange, from another seller rather than from the fund house, at whatever price it is trading at that moment. The units sit in your demat account.

That is the whole distinction, and everything else follows from it. Our pages on index funds and what NAV is cover the underlying mechanics of each.

An index fund has no price of its own. It has a NAV, calculated once a day, and every buyer that day gets the same figure.

An ETF has both. There is the underlying value of what it holds, and there is the price people are willing to pay for it on the exchange right now. Those two are usually close, and when trading is thin they can drift apart.

For a large, actively traded ETF this rarely matters much. For a smaller or less traded one it can, and the investor pays for that gap without it appearing anywhere as a charge. It is the cost that does not look like a cost, which makes it the one worth knowing about.

This decides it for most people, because most people are investing monthly rather than in one go.

In an index fund, a SIP is ordinary. An e-NACH mandate debits your account on a date and units are allotted at the day\'s NAV, exactly as with any other scheme.

In an ETF, a monthly purchase means a trade, which means a broker, and a whole number of units at whatever price is quoted. Some platforms automate this and it still behaves like placing an order rather than running an instruction. Fractional amounts do not work cleanly, so ₹5,000 a month does not translate neatly into units.

If your investing is a monthly habit rather than an occasional decision, that difference alone usually settles the question.

ETFs often carry lower expense ratios than index funds tracking the same index, and that is a genuine advantage. It is also not the whole cost.

• Brokerage and exchange charges apply to each ETF trade, which a monthly investor pays twelve times a year.
• The gap between price and underlying value is a real cost on each transaction and appears nowhere.
• A demat account typically carries an annual maintenance charge that a folio does not.

So a lower expense ratio can be the cheaper option for a large one-time holding and the more expensive one for a small monthly investor. Work it out for how you actually invest rather than from the headline figure, and see our page on the expense ratio for what that number does and does not cover.

The exit differs in the same way the entry does, and it is worth knowing before rather than during.

Redeeming an index fund means placing a request with the fund house, processed at the applicable NAV, with money reaching your registered bank account in the usual way. There is always a buyer, because the scheme itself redeems your units.

Selling an ETF means finding a buyer on the exchange at a price somebody is willing to pay. For a heavily traded ETF that is instant and unremarkable. For a thinly traded one it can mean accepting a price below the underlying value, which is precisely when you least want to.

That asymmetry is the strongest practical argument for the index fund route for an ordinary household investor, and it is rarely mentioned in comparisons that focus on expense ratios.

We will be plain, since this is a mechanical question rather than a matter of judgement.

An index fund suits somebody investing monthly, somebody without a demat account, and anybody who would rather place one instruction than a series of trades.

An ETF suits somebody who already holds a demat account and trades comfortably, is investing larger amounts less often, and is choosing a well-traded ETF where the price tracks value closely.

There is also a practical point about what is available. Not every index has both an ETF and an index fund tracking it, and for some indices the choice is made for you by what exists. Worth checking before deciding in the abstract which structure you prefer.

What neither does is change the underlying decision. Both hold the market, both fall with it in full, and neither removes the horizon question: money needed within two or three years does not belong in either, as our page on how to choose a mutual fund sets out. We recommend no specific scheme here; to talk through your own situation, get in touch.