Index Fund

An index fund is a mutual fund (or ETF) that passively replicates a stated benchmark index — Nifty 50, Sensex 30, S&P 500, FTSE 100 — by holding every constituent stock in the same weight as the index. There is no fund manager picking winners, no research team, no "market beat" promise. Instead, you own the market at near-zero cost and accept whatever the index returns. Invented in 1975 by Jack Bogle at Vanguard, the index fund is widely considered the single most important financial product of the last century.

SPIVA scorecards published by S&P globally consistently show that 80–90% of actively managed funds underperform their benchmark over 10-year windows, after fees. The reason is simple arithmetic: the average active-fund return before fees equals the market minus small frictions, and active expense ratios (1–2.5%) are dramatically higher than index expense ratios (0.05–0.50%). A Nifty 50 index fund with a 0.15% TER gets you ~99.8% of the underlying index return; an active large-cap fund at 1.75% typically delivers 98.2% of the index return before alpha, and most post-fee alpha is negative.

In India, direct plans of index funds like UTI Nifty 50 and HDFC Nifty 50 carry TERs of 0.07–0.20%. They qualify for equity LTCG treatment just like stocks.

Use our SIP calculator to project corpus from monthly index-fund investments over 20–30 year horizons.