Rolling Returns

Why a single return can mislead

Most fund factsheets quote point-to-point returns — the gain from one date to another, say the 5-year return measured today. The problem is that a single start and end date can flatter or distort the picture. A fund that happened to start its run just after a market crash will look brilliant; the same fund measured from a market peak will look poor. One lucky entry date tells you little about consistency.

What rolling returns do

Rolling returns fix this by measuring performance over *every possible period* of a given length. Instead of one 5-year number, you compute the 5-year return starting from each month over the past decade, then study the whole distribution. If you take 5-year windows at monthly intervals over ten years, you get 120 separate data points — a far richer and more honest view of how the fund actually behaved across many entry dates.

How Indian fund analysis uses them

This is standard practice in Indian mutual-fund research. Platforms like Value Research compute returns on adjusted NAV (adjusted for dividends and splits) and offer rolling-return analysis over common windows such as 3-year and 5-year periods. The approach is especially relevant for SIP investors, who enter the market on dozens of different dates, so a single point-to-point figure is almost meaningless for them.

The consistency test

The practical rule of thumb in Indian fund selection: between two funds with similar *average* returns, prefer the one with steadier rolling returns. A fund whose worst 5-year window still delivered a decent result, and which beat its benchmark across most periods, is more dependable than one with a high average but wild swings — even though both might quote the same headline number.

What to do with it. Before choosing a fund, look beyond the headline return. Examine its rolling returns: how often did it beat its benchmark across all windows, and how bad was its worst period? That distribution tells you whether good performance was a repeatable pattern or a one-time stroke of timing — exactly the kind of consistency that matters when you are investing for years, not a single neat interval.