Concepts· 6 min read· Updated April 2026

How to judge a mutual fund's performance — alpha, benchmark, and rolling returns

A fund returning 18% sounds great. But if its benchmark returned 22%, the fund actually underperformed. Here is how to read performance correctly.

Key takeaways
Every fund has a benchmark index it should be compared against, not absolute return
Alpha = fund return minus benchmark return — this is what you are paying for
Compare performance over 5–10 years, not 1 year
Rolling returns show consistency — more reliable than point-to-point returns
60–70% of large-cap active funds underperform their Nifty 50 benchmark over 10 years
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The 18% return that was actually a failure
Fund A returned 18% last year. Fund B (index fund) returned 22% last year. Fund A charged 1.5% expense ratio. Fund B charged 0.1%. Fund A's alpha = 18% − 22% = −4% per year. You paid 1.4% more in fees to get 4% less return. The fund manager destroyed value relative to doing nothing (buying an index fund).
Benchmark by fund category
Fund categoryBenchmark indexWhy this benchmark
Large CapNifty 50 or Nifty 100Represents large company universe
Mid CapNifty Midcap 150Mid-cap company universe
Small CapNifty Smallcap 250Small-cap universe
Flexi CapNifty 500All sizes combined
ELSSNifty 500 or Nifty 200Equity universe for tax-saving
Balanced AdvantageNifty 50 Hybrid 50:5050% equity + 50% debt mix
Liquid fundCRISIL Liquid Fund IndexShort-term money market
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Why point-to-point returns lie
Fund X 5-year return: 72%. Fund Y 5-year return: 68%. Looks like Fund X wins. But: • Fund X had a terrible year 1, then an amazing year 5 • Fund Y was consistently 12–14% each year • If you had invested 3 years ago (not 5), Fund Y beat Fund X Rolling returns fix this: instead of measuring one 5-year period, measure every possible 5-year period overlapping by 1 month. This reveals whether the fund consistently beats the benchmark — or just got lucky in the specific period being shown.
Where active management is worth paying for
Large-cap: index funds win
Most information already priced in by thousands of analysts
Very hard to find genuine 'edge' on Reliance, HDFC, Infosys
60–70% of active large-cap funds underperform Nifty over 10 yrs
Index fund at 0.1% TER is almost always the better choice
Mid/Small-cap: active can add value
Fewer analysts cover smaller companies
Real information gaps a skilled manager can exploit
Good active mid-cap funds have outperformed in India
Worth paying 1–1.5% TER if track record is strong (5+ yrs)
Educational content only. Numbers shown are illustrative — actual returns vary. This is not investment advice. Consult a SEBI-registered financial advisor before investing.

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