ETFs are often advertised as the low‑cost alternative to index mutual funds, but many investors overlook the hidden fees that can add up over time.
What the expense ratio actually tells you
The expense ratio is the yearly fee the fund manager charges for running the fund. An ETF might show 0.05% while a comparable mutual fund shows 0.25%, giving the impression of a 0.20% saving.
Hidden costs that appear when you trade ETFs
Unlike mutual funds, you don’t buy ETF units directly from the fund house. You purchase them on the stock exchange from other investors, which brings two extra costs:
- Bid‑ask spread – the gap between the price sellers are willing to accept and the price buyers must pay.
- Transaction commissions – brokerage fees you pay each time you buy or sell.
How the bid‑ask spread works
When an ETF’s net asset value (NAV) is ₹100, the market might quote:
- Bid price: ₹99.50 (price you receive when selling)
- Ask price: ₹100.50 (price you pay when buying)
Buying at ₹100.50 and later selling at ₹99.50 means you lose ₹1, or about 1% of your investment, even before any broker fees.
Why the spread exists – the creation‑redemption process
Authorized Participants (APs) are large broker‑dealers that create or redeem big blocks of ETF units. They profit from the spread:
- If the ETF trades above NAV, APs create new units cheaply and sell them at the higher market price.
- If the ETF trades below NAV, they buy cheap units, redeem them for the underlying securities, and keep the difference.
These profits come at the expense of retail investors who must trade at the market price, not the NAV.
ETFs were built for institutional liquidity, not retail cost savings
Mutual funds must sell securities when large redemptions occur, creating transaction costs that affect all remaining investors. ETFs solve that problem by letting investors trade with each other on an exchange, leaving the fund’s basket untouched. This design helps big players more than small, regular savers.
Which option is cheaper for regular investors?
For investors who invest small amounts regularly (e.g., through SIPs), the cumulative effect of bid‑ask spreads and brokerage fees can outweigh the lower expense ratio of an ETF. Index mutual funds, despite a higher expense ratio, let you buy at NAV with no spread, often resulting in a lower total cost.
Bottom line
Don’t judge an investment only by the headline expense ratio. Consider the full cost picture – spreads, commissions, and how often you trade. For many retail investors, especially those making frequent small purchases, a traditional index mutual fund may be the more economical choice.
Remember, this is perspective, not a prediction. Do your own research or consult a certified advisor before making any investment decisions.