Index fund vs ETF: comparative analysis
The Index fund vs Exchange-Traded Fund (ETF) comparison addresses two passive-investing routes for Indian retail investors: open-ended index mutual fund schemes and exchange-listed ETFs. Both track an underlying index (NIFTY 50 , NIFTY 500 , SENSEX , etc.) but differ in:
- Operational mechanics (subscription vs exchange trading).
- Cost structure (TER + tracking error).
- Liquidity (T+1 redemption vs intraday).
- Tracking error.
- Demat account requirement.
For Indian retail investors choosing between passive vehicles for the same underlying index, understanding the trade-offs helps optimise both cost and operational convenience.
Quick comparison
| Dimension | Index fund | ETF |
|---|---|---|
| Trading mode | MF subscription / redemption | Stock exchange |
| Demat account required | No | Yes |
| Trading hours | NAV computed end-of-day | Intraday (real-time) |
| Settlement | T+1 to T+3 redemption | T+1 settlement |
| Minimum investment | Rs 500 (typical) | One unit (Rs 100 to Rs 250 typical) |
| TER (typical) | 0.10 to 0.35% | 0.05 to 0.20% |
| Tracking error | 0.10 to 0.40% | 0.05 to 0.15% |
| SIP support | Native | Limited (some brokers offer) |
| Liquidity | T+1 to T+3 | Intraday on exchange |
| Discount/premium to NAV | None (NAV-based) | Possible (small typically) |
Operational mechanics
Index fund
- Investor subscribes via AMC / aggregator portal.
- AMC issues units at end-of-day NAV.
- Redemption via AMC; proceeds in T+1 to T+3.
- No demat account; folio-based ownership.
- SIP-native (NACH / UPI auto-debit).
ETF
- Investor places buy / sell order on NSE / BSE via broker.
- Trade executes at intraday market price (may differ slightly from NAV).
- Settlement T+1 via stock exchange clearing.
- Demat account required.
- SIP-style purchase via some broker platforms (limited).
Cost structure
TER comparison (typical, mid-2025)
| Index tracked | Index fund TER | ETF TER |
|---|---|---|
| NIFTY 50 | 0.05 to 0.20% | 0.04 to 0.10% |
| NIFTY Next 50 | 0.10 to 0.30% | 0.08 to 0.18% |
| NIFTY Midcap 150 | 0.20 to 0.40% | 0.15 to 0.30% |
| NIFTY 500 | 0.10 to 0.35% | 0.10 to 0.25% |
| Gold | 0.40 to 0.70% (via FoF) | 0.40 to 0.70% (direct) |
ETF TER is typically lower than the corresponding index fund TER for the same index. ETFs have a structural cost advantage.
Trading-side costs (ETF specific)
- Brokerage: 0.01% to 0.05% on ETF trades (or flat fee).
- STT: 0.1% of buy/sell value.
- Exchange fees: Negligible.
- Bid-ask spread: 0.05 to 0.20% for liquid ETFs (NIFTY 50, etc.); higher for less liquid.
For SIP-style monthly ETF buying, the bid-ask + brokerage on small lots can erode the TER advantage. Investors typically need to buy meaningful lots (>Rs 5,000 per transaction) for ETF economics to favour over index funds.
Tracking error
ETF
- Authorised Participant (AP) mechanism allows in-kind creation / redemption of large units.
- Keeps ETF price tightly aligned with underlying index.
- Typical tracking error: 0.05 to 0.15%.
Index fund
- Cash subscriptions / redemptions create some tracking deviation.
- Cash drag from idle subscription funds.
- Typical tracking error: 0.10 to 0.40%.
Per tracking error MF , this is a meaningful differentiator for serious passive investors.
Liquidity
ETF
- Trades intraday on exchange.
- Liquid ETFs (NIFTY 50, Gold) have tight bid-ask spreads.
- Less-liquid ETFs may have wider spreads.
Index fund
- T+1 redemption guaranteed (assuming AMC operations normal).
- No intraday trading.
- Subject to applicable NAV cut-off rules.
For active traders / market-timers, ETFs offer real-time access. For long-term holders, index funds’ simplicity often wins.
Tax treatment
Both ETFs and index funds (when equity-oriented) get the same tax treatment:
- LTCG (>12 months): 12.5% per Section 112A above Rs 1.25 lakh.
- STCG (≤12 months): 20% per Section 111A .
For non-equity-oriented (gold, debt ETF / index fund):
- Slab rate per debt MF taxation post-2023 .
Decision framework
Choose ETF when
- You have a demat account (or want to open one).
- You want lowest possible TER for the same index exposure.
- You’re a lump-sum investor in meaningful amounts.
- You value intraday trading flexibility (rare for passive investors).
- You don’t need SIP-native monthly investing.
Choose Index fund when
- You don’t have a demat account or don’t want one.
- You want SIP-style monthly investing (most native experience).
- You prefer simple folio-based ownership.
- TER differential is less material at your scale.
Mixed approach
Some investors:
- Use index fund for SIP-based monthly accumulation.
- Use ETF for periodic large lump-sum top-ups.
Indian context: Index fund growth
Indian index funds have grown substantially:
- 2017: Negligible AUM.
- 2020: Rs 25,000 crore industry AUM.
- 2024: Rs 2.5+ lakh crore.
The growth reflects:
- Direct-plan platform proliferation enabling easy index-fund access.
- Investor awareness of TER and tracking-error advantages.
- Active-fund underperformance vs benchmark in many cycles.
See also
- Mutual funds in India
- Index funds (India)
- Equity ETF (India)
- Gold ETF (India)
- Silver ETF (India)
- Debt ETF (India)
- NIFTY 50 index fund
- NIFTY 500 index fund
- NIFTY Next 50 index fund
- NIFTY Midcap 150 index fund
- NIFTY Smallcap 250 index fund
- SENSEX index fund
- Active vs passive equity India
- Tracking error MF
- Total Expense Ratio (TER)
- Section 112A
- Section 111A
- Equity mutual fund taxation in India
- Nifty BeES (2001 first ETF)
External references
References
- SEBI October 2017 categorisation circular.
- AMFI Best Practice Guidelines on passive funds.
- Bogle, John C., “The Little Book of Common Sense Investing” (Indian context analogous).