How to Analyse a Mutual Fund Before Investing

Picking a mutual fund based on star ratings or last year's returns is like choosing a doctor by their clinic decor. You need a proper framework. Here's an 8-step checklist that separates great funds from mediocre ones.

Step 1: Check Rolling Returns, Not Point-to-Point

Point-to-point returns depend on the start and end date. Rolling returns show consistency.

Rolling Returns:

Returns calculated over every possible period (e.g., every 3-year window) within a timeframe. A fund with 12% rolling return over 90% of 5-year periods is more reliable than one showing 15% in a cherry-picked period.

Example: Comparing Two Funds

Fund A: 3-year return = 18% (but rolling 3Y average = 11%) Fund B: 3-year return = 14% (but rolling 3Y average = 13%) Fund B is more consistent — Ramesh should pick it for his long-term SIP.

Step 2: Understand Risk Ratios

Returns without risk context are meaningless. Two key ratios:

Sharpe Ratio:

Measures return earned per unit of total risk. Higher is better. A Sharpe ratio above 1.0 is good, above 1.5 is excellent.

Sortino Ratio:

Like Sharpe, but only considers downside risk (negative returns). More useful because investors care about losses, not upside volatility.

Quick Rule

Compare Sharpe ratios only within the same category. A large-cap fund with Sharpe 1.2 beats one with 0.8, but don't compare it to a small-cap fund.

Step 3: Expense Ratio Matters More Than You Think

Every 0.5% in expense ratio compounds against you.

Example: Expense Ratio Impact

Priya invests ₹10,000/month for 20 years at 12% return.

Expense ratio 0.5%: Final corpus = ₹98,92,554
Expense ratio 1.5%: Final corpus = ₹87,15,372
Difference: ₹11,77,182 — just from 1% extra fees!

Direct plans always have lower expense ratios than regular plans. Always choose direct.

Step 4: Fund Manager Track Record

Check how long the current manager has run the fund. If the manager changed 6 months ago, past returns are irrelevant — they belong to the previous manager.

Look for managers with 5+ years at the same fund and consistent benchmark-beating performance.

Step 5: Portfolio Overlap Check

If you hold 3 equity funds and they all own HDFC Bank, Infosys, and Reliance in their top 10, you're not diversified — you're paying 3 expense ratios for the same portfolio.

Common Mistake

Holding 5-6 large-cap funds doesn't mean diversification. Use portfolio overlap tools to check. If overlap exceeds 50%, you need fewer funds.

Step 6: AUM — Too Big or Too Small?

AUM Size	Advantage	Risk
Below ₹500 Cr	Agile, can buy small stocks	Liquidity risk, higher impact cost
₹500-10,000 Cr	Sweet spot for most categories	Balanced
Above ₹10,000 Cr	Stable, lower impact cost	Hard to outperform in mid/small-cap

Step 7: Benchmark Comparison

A fund returning 14% sounds great until you see its benchmark (Nifty 50) returned 16%. That fund actually destroyed value. Always compare against the correct benchmark, not a savings account.

Step 8: Red Flags to Watch

Frequent fund manager changes (3+ in 5 years)
Sudden portfolio style changes (large-cap fund buying small-caps)
Consistently underperforming benchmark for 3+ years
Very high portfolio turnover (above 100%) — means excessive churn

Key Takeaways

Use rolling returns over point-to-point for consistency check
Sharpe ratio above 1.0 is good — compare within same category
Every 0.5% expense ratio costs lakhs over 20 years
Check portfolio overlap if you hold multiple funds
Always compare returns against the fund's benchmark

Quick Quiz

A fund returned 15% over 3 years while its benchmark returned 17%. What does this mean?

Explore mutual funds on our Mutual Funds page or compare funds side by side.