Best Index Funds in India for Long Term (2025): Top Picks, Returns & How to Choose

Category: Mutual Funds & Investing | Reading time: ~10 minutes

If you have spent any time researching mutual funds in India, you have almost certainly come across one central debate: active funds vs index funds. For years, Indian investors have favored active fund managers, trusting them to beat the market. But a quiet shift is underway. More and more retail investors are discovering that index funds — simple, low-cost, and remarkably effective — can be the backbone of serious long-term wealth creation.

Index funds are not a new concept globally, but their popularity in India has surged in the last five years. Assets under management in passively managed funds in India crossed ₹10 lakh crore, a figure that would have been unimaginable a decade ago. And the reason is straightforward: data consistently shows that over a 10–15 year horizon, most actively managed large-cap funds fail to outperform their benchmark index after fees.

This article walks you through what index funds are, how they work, the best index funds in India for long-term investing in 2025, and what you should look at before putting your money in one. Whether you are a first-time SIP investor or someone looking to simplify a complex portfolio, this guide gives you the full picture.

What Is an Index Fund?

An index fund is a type of mutual fund that passively tracks a market index — such as the Nifty 50 or the BSE Sensex — rather than trying to outperform it through active stock selection. The fund holds the same stocks in the same proportion as the index it mirrors.

For example, a Nifty 50 index fund holds all 50 stocks of the Nifty 50 index in exactly the proportions dictated by the index’s methodology. When Nifty 50 rises by 12% in a year, your fund returns approximately 12% — minus a small expense ratio.

The fund manager’s job here is not to pick stocks or time the market. It is purely to replicate the index as accurately as possible. This is why index funds are called passive funds.

How Does an Index Fund Work?

When you invest in an index fund, your money pools with other investors’ money. The fund buys the underlying stocks in the same weight as the target index. As the index gets rebalanced (which happens periodically), the fund adjusts its holdings accordingly. The returns you receive closely match the index’s performance, and the costs are minimal since no research team or active management is required.

Why Long-Term Investors Choose Index Funds in India

The case for index funds over long horizons rests on three pillars: cost, consistency, and compounding.

The Cost Advantage Is Real

Active large-cap mutual funds in India typically charge an expense ratio of 1.0%–1.75%. Index funds charge between 0.05% and 0.20%. This might seem like a small difference, but over 20 years, a 1.5% annual cost difference can erode nearly 25%–30% of your final corpus.

Consider this: if you invest ₹10,000/month via SIP for 20 years and earn 12% annual returns, an active fund charging 1.5% leaves you with roughly ₹88 lakh. The same investment in an index fund at 0.10% expense ratio leaves you closer to ₹98 lakh. The difference — about ₹10 lakh — is purely the cost drag.

Active Funds Struggle to Beat Benchmarks Consistently

The SPIVA India Scorecard, which benchmarks active fund performance against indices, has consistently shown that over 10-year periods, more than 60%–70% of actively managed large-cap funds underperform their benchmark. The few that do outperform rarely maintain that edge over subsequent periods.

Simplicity Reduces Costly Mistakes

Most investors lose money not because they pick bad stocks, but because they switch funds too often, exit during corrections, or chase recent performers. An index fund, with its boring consistency, actually encourages the discipline that builds wealth.

Best Index Funds in India for Long Term (2025)

Below is a curated list of the best index funds in India across different categories, based on tracking accuracy, expense ratio, fund house reputation, and AUM size.

1. Nifty 50 Index Funds — The Core of Any Portfolio

The Nifty 50 index includes India’s 50 largest companies by market capitalization and free float. It covers sectors like banking, IT, energy, FMCG, and automobiles. A Nifty 50 index fund gives you instant exposure to India’s most established businesses.

Note: Returns are indicative based on historical 5-year data. Past performance does not guarantee future returns.

2. Sensex Index Funds — An Equally Reliable Alternative

The BSE Sensex tracks 30 of India’s largest companies. Sensex index funds are slightly more concentrated than Nifty 50 funds but carry similar large-cap exposure. HDFC Index Fund – Sensex Plan and UTI Sensex Index Fund are the two most popular choices, both with expense ratios under 0.20%.

3. Nifty Next 50 Index Funds — The Growth Acceleration Layer

The Nifty Next 50 index tracks companies ranked 51st to 100th by market cap. Many of these are tomorrow’s Nifty 50 companies, making this index a potent growth engine. Historically, Nifty Next 50 has delivered higher returns than Nifty 50 over long periods, though with more volatility.

UTI Nifty Next 50 Index Fund and ICICI Prudential Nifty Next 50 Index Fund are strong options in this category with expense ratios around 0.30%–0.40%.

4. Nifty 500 and Total Market Index Funds — Maximum Diversification

If you want to own a slice of the entire Indian equity market — large caps, mid caps, and small caps — the Nifty 500 index or a Total Market Index fund is your answer. Motilal Oswal Nifty 500 Index Fund and Mirae Asset Nifty Total Market Index Fund bring nearly 500 stocks into one low-cost fund.

5. Nifty Midcap 150 Index Funds — For Higher Long-Term Returns

Mid-cap stocks have historically outperformed large caps over 15–20 year periods in India. The Nifty Midcap 150 captures India’s growth-oriented mid-sized companies. Motilal Oswal Nifty Midcap 150 Index Fund is the most prominent option, though investors should be comfortable with higher short-term volatility.

How to Evaluate an Index Fund Before Investing

Not all index funds are created equal, even if they track the same benchmark. Here is what to check before you invest.

Tracking Error — The Most Important Metric

Tracking error measures how closely a fund replicates its benchmark. A lower tracking error means the fund is doing its job better. Aim for a fund with a tracking error below 0.10%–0.15% for a Nifty 50 fund. Anything above 0.25%–0.30% should raise questions.

Expense Ratio — Keep It Low

For Nifty 50 funds, any expense ratio above 0.25% is relatively high. Direct plans always carry a lower expense ratio than regular plans, so always invest through the direct plan — either via the fund house’s website, MF Central, or platforms like Zerodha Coin, Groww, or Paytm Money.

AUM Size — Bigger Means More Liquidity

A fund with larger assets under management is generally better because it can replicate the index more efficiently, especially for less liquid stocks. Avoid very small index funds (under ₹500 crore AUM) as they may face operational challenges.

Fund House Track Record

Stick with fund houses that have a history of managing passive funds well. UTI, HDFC, ICICI Prudential, Nippon India, and Motilal Oswal are names with established passive fund operations in India.

Benefits of Index Funds for Long-Term Investors

• Low cost: Expense ratios are a fraction of active funds, which directly boosts your net returns.
• Broad diversification: A single Nifty 50 fund gives you exposure to 50 companies across multiple sectors.
• Tax efficiency: Lower portfolio churn means fewer capital gains events within the fund.
• Transparency: You always know exactly what the fund holds because it mirrors a publicly available index.
• No fund manager risk: You are not dependent on one person’s decisions. The index is the manager.
• Easy to invest via SIP: Index funds are available on all major platforms, and a SIP of as little as ₹500/month is possible.

Risks of Index Funds You Should Know About

Index funds are not risk-free. Understanding their limitations helps you invest with realistic expectations.

• No downside protection: When the market falls, your index fund falls with it — there is no active manager trying to reduce losses.
• Concentration risk in Nifty 50: The top 10 stocks in Nifty 50 make up nearly 60% of the index weight. A sector-specific downturn can hit hard.
• No chance of outperformance: By design, index funds will never beat the market. If you want the chance of higher returns, you need to accept active fund risk.
• Market-cap weighting bias: Index funds automatically buy more of whatever becomes most expensive, which means they are always overweight in the most richly valued stocks.

Who Should Invest in Index Funds in India?

Index funds are suitable for a wide range of investors, but they work best for:

• Beginners who want market exposure without picking stocks or funds.
• Long-term investors with a horizon of 7 years or more.
• Investors who want to minimize cost drag on their portfolio.
• People building a core portfolio to which they can add satellite positions later.
• Investors who have been burned by frequent fund-switching in the past and want a simpler approach.

Index funds may not be ideal for investors with very short time horizons (under 3 years) or those who need capital protection, where debt funds or FDs are more appropriate.

Index Fund Categories Compared

Conclusion

India’s equity market has delivered extraordinary wealth to patient investors over the decades. The BSE Sensex, for example, has grown from under 1,000 points in the early 1990s to over 75,000 points today. Index funds are the most efficient, lowest-cost way to participate in that journey without betting on individual stocks or relying on a fund manager’s skill.

Start with a Nifty 50 index fund if you are new to investing. Add a Nifty Next 50 or Nifty 500 fund as your portfolio grows. Review your allocation every couple of years, rebalance if necessary, and let compounding do the heavy lifting. The magic of long-term index investing is not in the excitement — it is in the quiet, steady accumulation of wealth that happens when you stay invested through cycles.

The best index fund for you is ultimately the one you start early, invest in consistently, and hold patiently for the long run.

Frequently Asked Questions (FAQs)

Disclaimer: This article is for educational purposes only and does not constitute financial advice. Mutual fund investments are subject to market risks. Please read all scheme-related documents carefully before investing. Consult a SEBI-registered investment advisor for personalised guidance.