Index Fund vs ETF in India: What Beginners Should Know

Index fund vs ETF: the short answer

Both an index fund and an exchange-traded fund (ETF) can track the same benchmark, such as the Nifty 50. The main difference is how you buy and sell them: index fund units are bought from the asset management company (AMC) at the day’s net asset value (NAV), while ETF units are bought and sold on a stock exchange through a demat account at a market price.

That single difference shapes almost everything else — pricing, liquidity, costs and the small practical hurdles you meet as an investor. This guide explains the structure of each, how buying works in India, and what to check before you choose.

See also on StockPil: SIP calculator.

What is an ETF in India?

An ETF is a mutual fund scheme whose units are listed on a stock exchange. It is still a pooled fund regulated as a mutual fund scheme, but its units trade like shares. You need a demat and trading account with a broker to buy or sell them.

Because ETF units trade on an exchange, the price is set by buyers and sellers during market hours. That price can sit slightly above or below the value of the underlying portfolio. The fund house publishes an indicative NAV, or iNAV, during the trading day to give you a rough reference point for that underlying value. The iNAV is an estimate, not a guarantee of the price you will get.

ETFs exist across many indices and asset classes, and they are also used by some investors for exposure to gold or debt. The mechanics described here apply broadly, though liquidity varies a lot from one ETF to another.

What is an index fund?

An index fund is a regular open-ended mutual fund scheme that aims to replicate the performance of an index. You buy it the way you buy any other mutual fund: through the AMC, a distributor, or an investment platform, using a lump sum or a systematic investment plan (SIP).

You do not need a demat account for a regular index fund. Units are allotted at the NAV applicable to your purchase, and redemptions are processed at the NAV of the day the fund processes your request, as per the scheme’s rules.

If you are new to the benchmark itself, our beginner’s guide to what the Nifty 50 is explains how the index is built and why it is used as a reference.

Structure: what is actually different

Feature	Index fund	ETF
Legal form	Open-ended mutual fund scheme	Mutual fund scheme with units listed on an exchange
Where you buy	AMC, distributor or platform	Stock exchange, via a broker
Demat account	Not required	Required
Price you get	NAV for the applicable day	Market price, which may differ from iNAV
When you can transact	Orders accepted per the fund’s cut-off rules	During market hours, subject to available buyers and sellers
SIP	Standard option	Possible through some brokers and platforms, but less standard

Both are treated as mutual fund schemes for regulation and disclosure. Both publish NAVs, and scheme performance is disclosed against a benchmark. The structural difference is the listing, not the investing idea.

How you buy them: demat vs AMC route

The AMC route (index funds)

You complete a one-time Know Your Customer (KYC) process, then invest through the AMC’s website, a distributor or an online platform. Purchases and redemptions happen at NAV. You can set up a SIP, and you can usually switch or redeem without worrying about whether someone else wants to buy your units.

The demat route (ETFs)

You open a demat and trading account, place an order on the exchange, and the units settle into your demat account. Your broker charges brokerage and other statutory charges as per its schedule. You also need to check the order book: a thinly traded ETF may have few buyers or sellers, which can affect the price you get and how quickly you can exit.

Large investors can create or redeem ETF units directly with the fund house in large lot sizes, which helps keep the market price close to the underlying value. Small investors generally buy and sell on the exchange instead.

Liquidity and iNAV: the part beginners miss

Liquidity is the biggest practical difference. With an index fund, the fund house is your counterparty, so redemption is a process rather than a trade. With an ETF, you depend on the market. A popular ETF on a broad index usually has tighter pricing than a niche one, but you should check trading volumes and the gap between the best buy and sell prices before placing a large order.

The iNAV is published during the day as a reference. If the market price is far from the iNAV, that is a warning sign — it may reflect thin trading, a stale estimate, or a mismatch between the ETF’s portfolio and the index. Do not treat the iNAV as a price you are guaranteed to get.

Tracking error and tracking difference

Both structures aim to mirror an index, but neither does it perfectly. Tracking error measures how much a fund’s returns deviate from its benchmark over time; tracking difference is the gap between the fund’s return and the index return over a period. Expenses, cash holdings, the timing of rebalancing and the cost of trading the underlying stocks all contribute.

Index changes matter too. When an index is reconstituted, funds tracking it must adjust their portfolios. Under Indian mutual fund rules, index funds and ETFs tracking different indices can coexist as separate schemes, and rebalancing to a revised list has to be completed within a set period. Those trades cost money, and the cost shows up in tracking.

Compare tracking records over several years, not a few months. A fund that looks tight over one quarter may drift over three years.

Costs: where the money goes

Costs come in two layers. The first is the expense ratio, the annual fee charged by the scheme, which is disclosed along with a break-up of investment and advisory fees, distributor commission and other expenses for each plan. The second is transaction cost: brokerage and statutory charges for ETFs, and any exit load or transaction charges that apply to a mutual fund purchase or redemption.

A low expense ratio is not automatically the cheapest option. A very cheap ETF with wide bid-ask spreads and brokerage on every trade can cost more in practice than a slightly more expensive index fund bought directly. Work out the total cost for your own pattern of investing — a monthly SIP behaves very differently from a few large trades.

Common mistakes and risks

• Buying an ETF at any price. Use limit orders where possible and check the iNAV and the order book first.
• Ignoring liquidity. A low-volume ETF can be hard to sell without moving the price.
• Comparing the wrong numbers. Compare the same plan type (direct with direct, regular with regular) and the same benchmark.
• Assuming index investing is risk-free. It removes manager risk, not market risk. The index can fall, and sector- or theme-based indices can be concentrated.
• Chasing recent performance. A fund that tracked well last year may not do so next year; look at the process and the long-term record.
• Forgetting the paperwork. KYC, bank mandates and nomination details cause more delays than most investors expect.

Which one suits you?

If you want simplicity, automatic SIPs and no demat account, an index fund is usually the easier route. If you already trade, are comfortable with order placement and want intraday pricing, an ETF can work — provided the specific ETF is liquid enough for your order size.

Either way, the checklist is the same: identify the index, check the expense ratio and tracking record, understand how you will buy and sell, and confirm the total cost for your investing pattern. The label matters less than those four things.

Sources

• Circular: categorization and rationalization of mutual fund schemes (Oct 6, 2017) – SEBI
• Circular: total expense ratio (TER) and performance disclosure (Oct 22, 2018) – SEBI