By WealthKit · 5 min read · Published Jul 2026 · Updated Jul 2026
A fund's expense ratio — the annual fee, expressed as a percentage of assets, that covers fund management and operating costs — is deducted from the fund's returns every single day, whether the market goes up or down that day. On a factsheet, a 1% or 2% number looks negligible. Run it through a 20-year SIP and it stops looking negligible at all.
The reason expense ratios matter so much more than they appear to is that they don't just cost you the fee itself — they cost you the RETURNS that fee would otherwise have generated, compounded for every remaining year you stay invested. Money paid away in year one doesn't just disappear; it disappears along with every year of growth it would have earned for the next 19 years.
This is fundamentally different from a one-time fee, like a brokerage charge on a single transaction. An expense ratio is a recurring, compounding drag that applies to your ENTIRE invested corpus, every single year, for as long as you hold the fund.
Consider two funds with genuinely identical portfolios and identical gross returns of 12% per year before fees — the only difference being expense ratio: Fund A charges 1% a year, Fund B charges 2% a year (a realistic gap between, say, a low-cost fund and a more expensive actively-managed alternative, or between a Direct and Regular plan of a similar strategy).
Net of fees, Fund A effectively compounds at roughly 11% a year, Fund B at roughly 10%. On a ₹10,000 monthly SIP over 20 years, that one-percentage-point gap in net returns compounds into a final corpus difference that runs into several lakhs of rupees — not because the funds performed differently, but purely from the extra 1% quietly deducted every year for two decades.
The gap widens further the longer the investment horizon runs, because compounding is itself exponential — a fee that costs you relatively little in year 3 costs you much more in absolute terms in year 25, once your invested corpus has grown substantially larger.
Index funds and ETFs, which simply replicate a market index rather than employ active stock-picking, typically carry the lowest expense ratios in the industry — often well under 0.5% for Direct plans — because there's minimal active management overhead. Actively managed equity funds, where a fund manager and research team are making ongoing stock-selection decisions, typically charge more, and Regular plans of any fund carry an additional distribution-commission layer on top of the fund's own management cost (see our guide on Direct vs Regular plans for the full breakdown).
None of this means expense ratio is the ONLY thing that matters — a genuinely skilled active fund manager can deliver returns well above their index after fees, and many funds have done exactly that over long periods. But it does mean expense ratio deserves real weight in the decision, not a passing glance, especially when comparing two funds with broadly similar strategies and historical performance. Over a long enough horizon, the fee difference alone can matter as much as genuine performance skill.
Put this into practice
Model it with the SIP Calculator →The same fund, the same portfolio, the same fund manager — but two different prices. Here is what actually separates a Direct plan from a Regular plan, and what it costs you over time.
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