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The difference between an ETF and a mutual fund, NAV vs market price, and watching liquidity
Published by The Retail Trader · AUG 09, 2026 · Features
An ETF is a fund that trades on the exchange like a stock. That one line says the whole thing, but it hides two or three practical points that cost new investors dearly.
A mutual fund is bought and sold once a day at the NAV, with the AMC. An ETF trades at any time during market hours, with another investor, at the market price.
So with an ETF you have to look at the same things you would look at in any stock — bid, ask, volume, and order type.
An ETF has an underlying NAV — the actual value of the assets held inside it. But its market price is set by demand and supply.
Usually the two stay close, because large participants arbitrage to bring them together. But in less liquid ETFs, or on very volatile days, the gap can become wide — and at that point the buyer or seller has to bear that gap themselves.
When choosing an ETF, look at:
• Daily traded volume — an ETF with low volume has a wide bid-ask spread.
• The bid-ask spread itself — check it on the screen before placing an order. It is part of your cost.
• Tracking difference — how far the ETF lags its index over the long term.
• Expense ratio — it should be low, but this alone is not enough. A wide spread eats up the benefit of cheap fees.
A market order can be dangerous in a less liquid ETF — it can fill far from the price shown on the screen. A limit order should be the default here.
And in the first few minutes after the market opens, the spread is often at its widest. Avoiding that window is a small change that directly affects your cost.
An ETF is convenient for people who already use a demat account and want intraday flexibility. For people who want an automatic SIP every month, the fund route is often more direct.
Neither is wrong — the mechanism of each is simply different, and not understanding that mechanism is the cause of most complaints.
This article is for educational purposes only — it is not a buy or sell recommendation, makes no claim of guaranteed returns, and is not advisory. Rules, rates and mechanics change from time to time at the exchange, SEBI and RBI, so verify every number yourself with your broker or the official source.