When does an active fund's fee make sense?

When Active Fees Are Justified

The answer is a single inequality:

$$IR \cdot TE > \text{Fee differential vs. passive benchmark}$$

If the fund's Information Ratio multiplied by its Tracking Error — definition">tracking error exceeds the extra cost you pay over a passive index fund in the same category, the active fee is worth paying. If not, the index fund wins on pure economics. ^[2]

Breaking It Down

IR (Information Ratio) = alpha ÷ tracking error. It measures how efficiently the manager converts active risk into active return. ^[10]

TE (Tracking Error) = Volatility — definition">volatility of the fund's returns relative to its benchmark. A TE below 3% signals a closet indexer; above 6% signals genuinely active, high-conviction bets. ^[3]

Fee differential = active fund's Expense Ratio — definition">expense ratio minus the cheapest index fund in the same category.

A Concrete Example

The large-cap fund doesn't clear the hurdle. The mid-cap fund does. ^[2]

Why Large-Cap Active Funds Rarely Pass This Test

• Nifty 50 stocks have 30–60 analysts each — information edges are thin
• SEBI mandates large-cap funds hold ≥80% in the top 100 stocks, limiting how different the portfolio can be
• Fewer than 15% of active large-cap funds have beaten the Nifty 50 on a rolling 10-year basis, net of fees ^[4]

Mid-cap and small-cap categories have lower analyst coverage, higher residual volatility, and more information asymmetry — the conditions where a skilled manager's edge actually compounds into alpha. ^[4]

Four Caveats Before You Conclude a Fund "Passes"

1. Past IR is a weak predictor. Use 5-year rolling IR, not cherry-picked periods. Expect reversion toward the mean. ^[2]
2. Check active share too. If active share is below 50%, the fund is a closet indexer — it structurally cannot generate enough independent bets to justify the fee, regardless of what the past IR shows. ^[3]
3. Factor beta ≠ alpha. If a "large-cap" fund's outperformance vs. Nifty 50 is explained by a mid-cap or quality tilt, that's factor beta — you could buy it cheaper via a factor ETF. ^[6]
4. Tax drag. Active funds trade more, triggering more capital gains events. After-tax alpha is lower than pre-tax alpha. ^[2]

Apply this → Go to Explore Funds, sort by 5-year Information Ratio, and run the $IR \times TE > \text{fee differential}$ test against the appropriate benchmark for each fund you hold.