ETF vs Mutual Fund: What's the Difference?
ETFs and index mutual funds can track the same index, yet they trade and cost differently. Here's how to tell them apart and when each suits you.
An Exchange-Traded Fund (ETF) and an index mutual fund can hold exactly the same basket of stocks — say, the Nifty 50 — and yet they are bought, priced, and held quite differently. Understanding the mechanics helps you pick the one that fits how you actually invest.
What an ETF is
Because an ETF trades on the exchange, its price moves continuously through the trading day, just like a stock. To buy or sell one, you place an order through a broker, and you need a demat account to hold the units. You can learn how that works in our guide to the demat account and the stock market.
How a mutual fund differs
A regular (open-ended) mutual fund does not trade on an exchange. You buy or sell units directly with the fund house, and the transaction happens at the day's single NAV, calculated after markets close. There is no live price and no need for a demat account — you can invest straight from your bank, including through an automatic SIP.
The practical differences
| Feature | ETF | Index mutual fund |
|---|---|---|
| How you buy | On the exchange, via a broker | From the fund house |
| Pricing | Live, through the day | Once a day, at NAV |
| Demat account | Required | Not required |
| SIP | Harder to automate | Easy to automate |
| Expense ratio | Typically very low | Low, often slightly higher |
Costs beyond the expense ratio
ETFs often advertise rock-bottom expense ratios, but there are other costs to weigh. Buying on the exchange means you may face a bid-ask spread (the gap between the buying and selling price) and brokerage charges. If an ETF is thinly traded, that spread can widen, quietly adding to your cost.
An index mutual fund has no spread — you always transact at NAV — but its expense ratio may be a touch higher than the cheapest ETF.
Which suits you?
- If you want to automate a monthly SIP and keep things simple without a demat account, an index mutual fund is usually the easier path.
- If you already trade on the exchange, want the lowest possible expense ratio, and are comfortable placing orders, an ETF can be very cost-efficient — provided it is liquid.
Both are sensible, low-cost ways to track an index. Neither is automatically "better"; they suit different habits.
Common mistakes to avoid
- Buying an illiquid ETF. A thinly traded ETF can have a wide spread that quietly adds to your cost.
- Chasing the lowest expense ratio alone. Trading costs and spreads can outweigh a tiny fee advantage.
- Forgetting you need a demat account for ETFs but not for regular mutual funds.
- Trying to automate a monthly SIP into an ETF, which is far simpler with an index fund.
Bottom line
ETFs and index mutual funds can deliver the same market exposure. The ETF gives you exchange trading and ultra-low fees at the cost of needing a demat account and watching spreads; the index fund gives you simplicity and easy SIPs. Match the tool to how you like to invest.
Frequently asked questions
Do I need a demat account to buy an ETF?
Yes. ETF units are held in a demat account and bought through a broker on the exchange. A regular index mutual fund needs no demat account — you can buy it directly from the fund house.
What is a bid-ask spread?
It is the gap between the highest price a buyer will pay and the lowest a seller will accept. A wider spread makes it more expensive to trade in and out, and it is a real but easily overlooked cost of ETFs.
Which is cheaper, an ETF or an index fund?
ETFs often advertise lower expense ratios, but trading them can involve a bid-ask spread and brokerage. An index mutual fund has no spread but may carry a slightly higher expense ratio. The cheapest on paper isn't always cheapest in practice.
Which is easier for a monthly SIP?
An index mutual fund — it automates easily from your bank with no demat account. Automating regular ETF purchases is more awkward.
Sources & further reading
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