Information ratio: how consistently a fund beats its benchmark

The Information ratio (IR) measures how consistently a fund beats its benchmark. Where alpha tells you how much a fund outperformed, the IR tells you how reliably it did so — which is precisely the difference between a skilled manager and a lucky one.

The formula

IR = Active return ÷ Tracking error

"Active return" is how much the fund beat its benchmark on average; "tracking error" is the standard deviation of that outperformance — how much the beating jumps around from period to period. A manager who beats the benchmark by a steady 3% every year has a higher IR than one who beats it by +10% then −4%, even with a similar average.

A worked example

Fund X outperforms the Nifty 500 by 2.4% a year on average, and its outperformance wobbles with a tracking error of 3%. Its IR is 2.4 ÷ 3 = 0.8 — strong. Fund Y averages a bigger 4% of outperformance, but erratically, with a 10% tracking error: its IR is just 0.4. On a ₹10 lakh SIP-style investment held for years, Fund X's steady edge is far more likely to actually show up in your final corpus, because it doesn't depend on you catching the right two years. Consistency compounds; streaks fade.

How to read it

• Higher is better — consistent, repeatable outperformance.
• An IR above 0.5 is good; above 1 is excellent and rare.
• It's one of the best signals of genuine manager skill (versus luck).

Where the IR earns its keep

The IR is most useful when choosing active funds in categories where beating the index is genuinely possible — mid caps, small caps and flexi caps. In large caps, where most active funds trail the index after fees, a persistent positive IR is rare and therefore especially meaningful. For an index fund the concept inverts: you want near-zero active return and minimal tracking error, so IR isn't the right lens there — cost and tracking fidelity are.

Common mistakes

Don't read the IR over a single year — skill only separates from luck across multiple periods, ideally 3-5 years or more. Don't compare IRs computed against different benchmarks; a fund measured against the wrong index produces a meaningless ratio. And as with every backward-looking statistic, a high IR describes what the manager did, not what they will do — manager changes and mandate drift can reset the story overnight. Past performance does not guarantee future results.

→ Compare funds against their benchmark in the Compare tool, and check consistency with rolling returns.