Index Funds in India: What They Are and How to Invest (2026 Guide)

In plain words

You want to invest in the stock market but cannot decide which companies to buy. An index fund takes that decision away. It buys every stock in a market index, such as the Nifty 50, in the same weights as the index. When the index rises or falls, the fund rises or falls with it.

What is an index fund?

An index is a list of stocks that works as a scorecard for one part of the market. The Nifty 50, which tracks 50 large companies listed on the NSE, is one example.

As per SEBI’s investor site, an index mutual fund aims to replicate a specific index. It follows a passive strategy: the fund does not try to beat the market. It tries to mirror the index by holding all or most of its securities in the same proportions.

SEBI’s investor education material describes passive funds the same way. They hold the same securities in the same proportion as the index, make no active stock or sector choices, and change their portfolio only when the index itself changes.

Here is how SEBI contrasts the two styles:

Why do people choose index funds?

SEBI lists these reasons on its investor site:

• Lower cost. Less trading and no stock-picking research mean lower expense ratios than active funds.
• Simplicity. The fund’s job is easy to understand, which suits beginners.
• Transparency. The holdings mirror a public index, so you know what you own.
• Diversification. One fund gives you exposure to many stocks across sectors, which softens the damage when any single company falls.

The last point has a limit. Diversification reduces the risk of one stock hurting you. It does not protect you when the whole market falls. SEBI’s investor material treats equity as a volatile, high-risk asset class, and an equity index fund carries that risk.

Index funds suit people who want market exposure without picking stocks and who can stay invested for several years. Because they follow the market, they can lose value over short periods, so your time horizon matters more than the choice of fund.

Index funds in India: what is available?

Index funds are not only about the Nifty 50. NSE publishes a list of fund houses that run index funds on its indices. The table below is a sample of what that page shows, not the full list.

SEBI also notes that index funds exist for bond markets, international indices and themes such as technology or healthcare. The index a fund follows decides its risk. A Nifty Smallcap 250 index fund and a Nifty 50 index fund are both “index funds”, yet they do not behave alike.

Nifty 50 index funds

The Nifty 50 is the most widely used benchmark. NSE’s page lists 20 fund houses with a domestic Nifty 50 index fund. That page was last updated on 25 February 2025, so newer launches may be missing. Check the NSE page and each fund house’s website for the current picture.

NSE adds that this list is for convenience only and that you should read the Scheme Information Document for full details.

Top index funds in India: how to compare them

Many websites publish a “top index funds in India” list. This page does not, and here is why. A ranking built on past returns says little about a fund that is meant to copy an index, and naming one fund as the winner would be a recommendation, not information.

Funds on the same index hold almost the same stocks. So the comparison that matters is how closely each one copies the index and what it costs you:

1. Same index. Compare Nifty 50 funds only with other Nifty 50 funds.
2. Expense ratio. SEBI says index funds cost less than active funds. Compare the ratio across the funds on your list, using the direct plan of each.
3. Tracking error. SEBI defines it as the small gap between fund and index caused by expenses and operational inefficiencies. A smaller gap means closer copying.
4. Fund documents. SEBI points investors to the Scheme Information Document (SID), which covers the investment objective, strategy, and fees and expenses.

You can find the expense ratio and tracking error in each fund’s factsheet on the fund house’s website, and many fund houses also publish them monthly. Look at more than one period, because tracking error changes from year to year.

How to invest in index funds

SEBI’s investor material lists several routes: a physical form, the fund house’s website, the fund house’s mobile app, or an AMFI-registered distributor.

1. Complete KYC once. KYC in the securities market runs through KYC Registration Agencies (KRAs) registered with SEBI. You complete it one time, and your details are shared with other intermediaries. You can check your status on a KRA’s website.
2. Choose the index. For most first-time investors this means a broad index such as the Nifty 50, because the risk depends on the index.
3. Choose direct or regular. Per SEBI, a direct plan is offered by the fund house with no commission, so it has a lower expense ratio and a higher NAV. A regular plan is bought through an intermediary, so it carries commission and a higher expense ratio. The portfolio is the same.
4. Choose growth or dividend option. In the growth option, gains stay in the fund and show up in the NAV.
5. Choose lump sum or SIP. A lump sum is one large payment. A SIP (Systematic Investment Plan) spreads your money across fixed dates, such as monthly.
6. Submit bank details and invest. You will need to give your bank account details and a cancelled cheque copy. Once the fund house accepts your documents, you can start investing.
7. Check the Risk-o-Meter. SEBI’s six risk levels run from low to very high. Look at the level shown for the fund before you invest.

Expect to be asked about nomination while you invest. The rules on nomination have been revised more than once, so read the current requirement on SEBI’s investor site or on your fund house’s form before you submit.

Worked example

This example is hypothetical. The numbers are made up to show the arithmetic, not any real fund’s result.

Suppose two Nifty 50 index funds each receive ₹1,00,000 for one year. In this made-up year the index rises 12%. Fund A charges 0.2% a year and Fund B charges 0.8% a year. To keep it simple, assume cost is the only reason a fund differs from the index.

• Fund A: 12% − 0.2% = 11.8%. ₹1,00,000 × 1.118 = ₹1,11,800
• Fund B: 12% − 0.8% = 11.2%. ₹1,00,000 × 1.112 = ₹1,11,200
• Difference: ₹1,11,800 − ₹1,11,200 = ₹600

Both funds hold the same stocks, yet one ends the year ₹600 ahead. Real funds also differ by tracking error, which is why you check both numbers.

Now the limitation. Suppose the index falls 10% in another year. Both funds fall by about the same amount. An index fund copies the index in bad years too.

Common mistakes

• Treating “index fund” as “safe”. The risk comes from the index. A sector or small-company index fund can swing much more than a Nifty 50 fund.
• Comparing funds on different indices. A Nifty 50 fund and a Nifty Next 50 fund hold different companies, so their returns are not comparable.
• Picking a regular plan by accident. The scheme name shows “Direct” or “Regular”. Check it before you confirm.
• Ignoring tracking error. Two funds on the same index can end up with different results because of costs and operational gaps.
• Expecting to beat the market. SEBI states the goal is to match it.

Tax on index funds

How an index fund is taxed depends on what it holds and how long you stay invested. The rates below are the ones in force for FY 2026-27, and the 2026 Budget left them unchanged.

• Equity index funds (for example, a Nifty 50 fund): gains on units held for more than 12 months are long-term and taxed at 12.5% on the amount above ₹1.25 lakh of long-term gains in a financial year. Gains on units sold within 12 months are short-term and taxed at 20%.
• Debt index funds (for example, a Nifty G-Sec fund): gains are taxed at your income tax slab rate, whatever the holding period.

Surcharge and cess apply on top. Funds that do not mainly hold Indian equity, such as international index funds, can be taxed differently. Rules and section numbers can change, so confirm the current position on the Income Tax Department website and speak to a qualified tax professional about your own case.

What to do next

• Check your KYC status on a KRA website.
• Decide which index you want exposure to before you look at any fund.
• Open the factsheet for the funds on that index and note the expense ratio and tracking error.
• Read the Scheme Information Document of the fund you shortlist.
• Pick direct or regular, then lump sum or SIP.

Bottom line

An index fund gives you the return of a market index, minus costs. Since funds on the same index hold the same stocks, compare cost and tracking error rather than a top-10 list. The risk of the index is still yours.