Index funds and ELSS funds are often mentioned in the same breath, but they solve different problems. An index fund is a low-cost way to own the whole market. An ELSS (equity linked savings scheme) is an actively managed equity fund that also gives you a tax deduction, in return for a 3-year lock-in. This guide compares a Nifty 50 index fund with an ELSS fund on the things that matter: tax, lock-in, cost, risk and returns. It explains how they work; it does not recommend any fund.
Index Fund vs ELSS at a Glance
| Nifty 50 index fund | ELSS fund | |
|---|---|---|
| How it is managed | Passive: copies the Nifty 50 index | Active: a fund manager picks the stocks |
| What it holds | The 50 Nifty 50 stocks in index weights | Mostly Indian shares chosen by the manager, which can include mid- and small-cap companies |
| Tax deduction on investing | None | Up to ₹1.5 lakh a year under section 123 (old 80C), old regime only |
| Lock-in | None (an exit load may apply for a short period) | 3 years from the date of each investment |
| Direct-plan expense ratio (examples below) | 0.19–0.29% | 0.65–1.28% |
| Tax on gains | Equity rules: 20% if sold within 12 months; 12.5% on long-term gains above ₹1.25 lakh a year | Same equity rules; always long-term, because of the 3-year lock-in |
| Main risk | Market risk only; it falls when the Nifty 50 falls | Market risk plus manager risk: the fund can lag its benchmark |
How a Nifty 50 Index Fund Works
A Nifty 50 index fund buys the stocks in the Nifty 50 in the same proportions as the index. The Nifty 50 is a 50-stock index weighted by free-float market value; its constituents are selected from Nifty 100 companies that trade in the futures and options segment and meet liquidity rules. Nobody is trying to beat the market. The fund aims to match it, minus its costs.
Because every Nifty 50 index fund holds the same stocks, they differ on only three things:
- Expense ratio (TER): the yearly fee. Across five large Nifty 50 index funds, direct-plan TERs ranged from 0.19% to 0.29% at 31 August 2026.
- Tracking error: how closely the fund follows the index day to day. AMFI publishes it for every index fund. The same five funds were at 0.02–0.04% (direct plans, 31 August 2026); anything under about 0.05% is very tight.
- Fund size: very small funds can have higher trading costs.
An index fund will always trail its index slightly, by roughly its expense ratio plus trading costs. Our guide on how to pick the right index fund goes deeper. Want the ranked list? See the best Nifty 50 index funds in 2026. If you are deciding between an index fund and an ETF on the same index, the ETF vs index fund calculator compares the two after costs.
How an ELSS Fund Works
An ELSS is a diversified equity fund with two special features:
- Tax deduction: what you invest counts towards the ₹1.5 lakh yearly limit under section 123 of the Income-tax Act, 2025 (the old section 80C), from tax year 2026-27. The limit is shared with EPF, PPF, life insurance premiums, tuition fees and home-loan principal. The deduction exists only in the old tax regime.
- Lock-in: each investment is locked for 3 years. With a SIP, every instalment has its own lock-in: money invested in April 2026 can be redeemed from April 2029, and an instalment made in March 2027 only from March 2030.
At most, the deduction saves ₹46,800 a year, if you are in the 30% slab (₹1.5 lakh × 31.2% including 4% cess). In the 20% slab it is ₹31,200. For FY 2025-26 income, filed in 2026, the same ₹1.5 lakh deduction applies under section 80C of the old Income-tax Act, 1961.
ELSS is not the only way to use this limit. PPF and NPS also qualify, with different lock-ins and risk; the ELSS vs PPF vs NPS calculator shows how they compare over your time horizon.
If you use the new regime, there is no deduction. An ELSS then becomes an ordinary actively managed equity fund that you cannot sell for 3 years.
Costs: The Gap Is Real
ELSS funds are actively managed, so they charge more. Among the eight large ELSS funds we checked in late September 2026, direct-plan TERs ranged from 0.65% to 1.28%, against 0.19–0.29% for Nifty 50 index funds.
To see what that means, assume ₹1.5 lakh invested at the start of each year for 20 years, and the same 12% a year return before costs:
- At a 0.25% TER, the corpus is about ₹1.17 crore.
- At 0.65%, about ₹1.12 crore (₹5.7 lakh less).
- At 1.00%, about ₹1.07 crore (₹10.4 lakh less).
- At 1.28%, about ₹1.03 crore (₹14.1 lakh less).
This assumes both funds earn the same before costs. An ELSS only comes out ahead if its manager beats the index by more than the extra fee, or if the tax saved makes up the difference.
From 1 April 2026, SEBI's new disclosure rules split costs into a base expense ratio (BER) and other charges. When you compare funds, compare the same measure; the figures in this article are total TERs, with BER shown separately in the table below.
Returns: What the Data Shows
Active funds as a group have struggled to beat broad indices over long periods. S&P's SPIVA India Mid-Year 2025 scorecard found that 73.3% of Indian large-cap funds underperformed the S&P BSE 100 over 10 years to June 2025.
ELSS funds are not large-cap funds, though. They can invest across company sizes, and the last five years favoured mid-sized companies: the Nifty 50 Total Return Index returned 6.37% a year over the five years to 28 September 2026, while a Nifty Midcap 150 index fund returned about 15%. Over that window, ELSS returns varied enormously: among the eight ELSS funds we checked, 5-year returns ranged from 5.01% to 14.82% a year. Picking an active fund adds a choice that can go well or badly.
Examples with dated data (not recommendations)
Direct plan, Growth option. Funds are listed alphabetically.
| Fund | Type | TER (BER) | 5-year return a year |
|---|---|---|---|
| HDFC Nifty 50 Index Fund | Index | 0.29% (0.22%) | 6.09% |
| ICICI Prudential Nifty 50 Index Fund | Index | 0.24% (0.17%) | 6.10% |
| Motilal Oswal Nifty 50 Index Fund | Index | 0.19% (0.13%) | 6.17% |
| SBI Nifty Index Fund | Index | 0.24% (0.16%) | 6.10% |
| UTI Nifty 50 Index Fund | Index | 0.25% (0.18%) | 6.13% |
| Canara Robeco ELSS Tax Saver Fund | ELSS | 0.69% (0.54%) | 9.48% |
| HDFC ELSS Tax Saver Fund | ELSS | 1.21% (0.97%) | 13.22% |
| Mirae Asset ELSS Tax Saver Fund | ELSS | 1.00% (0.57%) | 10.10% |
| Parag Parikh ELSS Tax Saver Fund | ELSS | 0.65% (0.54%) | 10.19% |
| SBI ELSS Tax Saver Fund | ELSS | 1.28% (0.84%) | 13.94% |
Returns are point-to-point CAGR from AMFI NAVs to 28 September 2026. Index-fund TERs at 31 August 2026; ELSS TERs from AMC data on 24–28 September 2026. Past returns do not predict future returns, and a different 5-year window can give a very different ranking.
Notice how close the five index funds are to each other: their 5-year returns sit within about 0.1 percentage point. The ELSS funds are spread over more than 4 points. That spread is the active-management trade-off in one table.
When Each One Fits
| Your situation | What usually fits |
|---|---|
| You use the new tax regime | ELSS gives no tax benefit. A low-cost index fund avoids both the lock-in and the higher fee. |
| You use the old regime and have unused section 123 room | An ELSS can fill the gap. The deduction is worth up to ₹46,800 a year at the 30% slab. |
| Your ₹1.5 lakh is already used by EPF, PPF, insurance or home-loan principal | Extra ELSS saves no more tax. It is only worth holding if you want that active fund anyway. |
| You want the lowest cost and no reliance on a fund manager | A Nifty 50 index fund. |
| You may need the money within 3 years | Not ELSS, because of the lock-in. Equity of any kind is risky over short periods. |
Many investors in the old regime use both: ELSS only for the part of the ₹1.5 lakh limit not already used, and an index fund for the rest of their equity. Before choosing ELSS for tax, compare it with PPF and NPS using our ELSS vs PPF vs NPS calculator, and check whether the old regime is right for you in our regime comparison. If you are deciding how to invest the ELSS amount itself, see ELSS lump sum vs SIP.
Common Mistakes
- Buying ELSS in the new regime for a tax benefit that does not exist there.
- Investing more than ₹1.5 lakh a year in ELSS for tax. Anything above the limit saves no tax and is still locked in.
- Choosing an index fund on past returns. Funds tracking the same index return almost the same; compare expense ratio and tracking error instead.
- Choosing an ELSS on one year's return. Look at 5- and 10-year records against its benchmark, and at its cost.
- Holding several Nifty 50 index funds. They own the same 50 stocks, so this adds paperwork, not diversification.
This article compares index funds and ELSS funds in general terms. The funds named are examples to show costs and the spread of returns; they are not recommendations. Check the latest factsheet before investing.
