ETFs, index funds, and Funds of Funds can all provide diversified exposure, but the investor experience differs.
ETFs trade on an exchange, index funds transact at NAV with the AMC, and FoFs invest in another fund or ETF.
The right structure often depends more on execution, liquidity, cost and tax treatment than on the label “passive.”
What this Article Covers
- The three structures in simple language
- Cost: TER is only part of the story
- Tracking error and tracking difference
- Liquidity: why ETF volume matters
- Demat, SIP and execution convenience
- Taxation: structure and underlying asset both matter
- ETF vs index fund vs FoF: who may prefer what?
Investors looking beyond market-cap indices can explore smart beta and factor funds, which use rules based on momentum, value, quality or volatility.
The three structures in simple language
An Exchange Traded Fund is a mutual-fund scheme whose units trade on a stock exchange during market hours.
An index fund is an open-ended mutual-fund scheme that seeks to track an index and allows purchase or redemption at the applicable NAV.
A Fund of Funds invests in units of another fund or funds rather than directly owning the underlying securities.
Two products may target the same Nifty index but still deliver slightly different investor outcomes because of TER, trading spread, tracking difference, cash drag, taxes and execution price.
If you are new to mutual funds, first understand how SIP-based mutual fund investing works before deciding whether an ETF, index fund or FoF is the better wrapper for your goal.
Cost: TER is only part of the story
Expense ratio matters because it is deducted from the scheme’s assets and therefore affects NAV. ETFs often advertise low TERs, but investors can also face brokerage, statutory charges, and bid-ask spread.
A thinly traded ETF with a wide spread can be more expensive to enter or exit than the TER suggests.
Index funds avoid exchange spreads for normal purchases and redemptions but can have a different expense structure.
FoFs add the economics of the underlying fund plus the FoF layer, subject to applicable rules, so investors should look at total effective cost rather than one headline number.
Tracking error and tracking difference
Tracking difference is the gap between the fund’s return and the benchmark return over a period. Tracking error measures how much that difference varies.
Low cost helps, but portfolio replication, cash balances, corporate actions, rebalancing and execution also affect tracking.
When comparing two passive funds on the same benchmark, look at both TER and actual tracking data.
A slightly more expensive fund can sometimes track more efficiently than a cheaper competitor.
Liquidity: why ETF volume matters
ETF units trade between buyers and sellers. If natural trading liquidity is low, market makers and authorised participants can still support the creation/redemption mechanism, but retail investors should watch bid-ask spreads and market depth.
Use limit orders rather than blindly placing large market orders in an illiquid ETF.
Index funds do not require an exchange buyer for ordinary transactions with the AMC, making them operationally simpler for monthly SIP investors. For some people, that convenience can outweigh a tiny TER difference.
Because ETFs are bought and sold on the stock exchange, investors who don’t yet have one should understand how to open a demat and trading account before choosing the ETF route.
Demat, SIP and execution convenience
ETFs normally require a demat and trading account. You can buy index funds directly from the AMC or through mutual-fund platforms without exchange execution.
FoFs also behave like conventional mutual-fund units from the investor’s perspective.
For disciplined SIP investing, index funds are often simpler because you can invest a fixed rupee amount at the applicable NAV. ETF investors may need to buy whole units and deal with the market price.
Fractional leftovers are usually minor, but process preference matters for long-term consistency.
Taxation: structure and underlying asset both matter
Investors should not assume every ETF, index fund or FoF receives identical tax treatment.
Equity-oriented funds meeting the statutory equity threshold can qualify for equity-oriented fund taxation, while debt, gold, international and FoF structures can fall under different provisions.
Tax classification can materially affect post-tax returns, especially for gold, international, and debt-oriented products.
Check the current tax status of the specific scheme rather than deciding based only on the words ETF or index.
ETF vs index fund vs FoF: who may prefer what?
An experienced investor who already uses a broker and values intraday execution may prefer an ETF.
A long-term SIP investor who wants automated investing with minimal execution decisions may prefer an index fund.
A FoF can be useful when it provides convenient access to an underlying strategy or overseas/commodity exposure that is operationally difficult to access directly.
The best structure lets you get the desired exposure at a reasonable all-in cost without creating behavioural friction.
Structure Comparison
| Feature | ETF | Index Fund | Fund of Funds |
| How bought | Stock exchange | AMC / MF platform | AMC / MF platform |
| Demat required | Usually yes | No | No |
| Intraday trading | Yes | No | No |
| Execution price | Market price | Applicable NAV | Applicable NAV |
| Bid-ask spread | Yes | No exchange spread | No exchange spread |
| SIP convenience | Broker-dependent | High | High |
| Main extra consideration | Liquidity/spread | Tracking and TER | Underlying fund + FoF costs/tax |
Passive Fund Checklist
| Metric | What good looks like |
| TER | Competitive for the category |
| Tracking difference | Small and stable over relevant periods |
| Tracking error | Low relative to peers on same benchmark |
| AUM | Adequate scale; not a guarantee of quality |
| ETF spread | Tight during normal market conditions |
| Portfolio | Closely aligned with stated index methodology |
Passive funds should still fit your emergency fund, time horizon, asset allocation and other goals, so use a broader personal finance planning framework before selecting a product only on cost.
After choosing the investment structure, the next decision is often whether to invest through SIP or lump sum, especially when markets are volatile.
Fund structure is only one consideration: the mutual fund Riskometer and stress-test disclosures help explain risks inside the underlying portfolio.
Frequently Asked Questions
Is an ETF always cheaper than an index fund?
Not necessarily. Compare TER plus brokerage and bid-ask spread, and then check tracking difference.
Do I need demat for an index fund?
No, you can generally hold a conventional index mutual fund without a demat account.
What is tracking error?
It measures how much the fund’s return differs from its benchmark over time.
Why can ETF price differ from NAV?
ETFs trade in the market, so the price can temporarily differ from the underlying NAV/iNAV because of demand, supply and market conditions.
Are FoFs taxed like the underlying fund?
Not automatically. Tax classification depends on current law and the FoF’s structure. Check the specific scheme.
Disclaimer: This article is educational and does not constitute investment, legal or tax advice. Financial regulations and tax provisions can change; verify the latest position before acting.