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Plain-English definition

What is Index fund?

An index fund is a mutual-fund scheme designed to reproduce the composition or behaviour of a specified market index.

Reviewed by Kshitij Jain, Principal Officer · SEBI Investment Adviser INA000022172 · Updated 24 October 2026

How Index fund works

Open-ended index funds transact with the fund at applicable NAV, unlike ETFs that trade on an exchange. Replication method, expense, cash drag and portfolio events determine how closely the result follows the index.

A rupee example

A ₹10,000 investment in an index fund buys units of one pooled portfolio rather than separately purchasing every company in the index.

The example isolates one idea so the arithmetic is visible. Real outcomes can include taxes, fees, cash-flow timing and market movement that the simplified example does not model.

Why it matters for your family

Index choice determines the risk families actually own. A low-cost sector index can be less diversified than a somewhat costlier broad-market fund.

Questions people ask

What does Index fund mean?
An index fund is a mutual-fund scheme designed to reproduce the composition or behaviour of a specified market index.
Why does Index fund matter for a family?
Index choice determines the risk families actually own. A low-cost sector index can be less diversified than a somewhat costlier broad-market fund.
Where can I verify information about Index fund?
Start with SEBI Investor, linked on this page, and the current official document for the product or tax year involved.

This page is general education, not personalised investment or tax advice. Rules can change; verify current official documents before acting. Investment in securities markets is subject to market risk.