MARKETS

What Is Expense Ratio? The Fee That Quietly Eats Into Every Return

VC By Victor Cranson · June 16, 2026 · 3 min read

Expense ratio is the annual fee a mutual fund charges its investors, expressed as a percentage of the fund’s average assets under management, to cover the cost of managing the fund: the fund manager’s fees, research, administration, marketing, and distributor commissions where applicable. It’s deducted proportionally and continuously from the fund’s assets, which means it’s already factored into the NAV you see; you don’t receive a separate bill for it, but you’re paying it regardless.

Because it’s deducted silently, expense ratio is one of the easiest costs for investors to overlook, even though its long-term impact on returns is substantial.

How SEBI regulates expense ratios

SEBI caps the maximum expense ratio a mutual fund can charge, on a sliding scale that decreases as the fund’s Assets Under Management (AUM) grows, the idea being that larger funds benefit from economies of scale and should pass some of that efficiency on to investors rather than continuing to charge the same percentage regardless of size. The caps also differ by fund category: equity funds generally have a higher permissible expense ratio than debt funds, reflecting the additional research and active management typically involved. Index funds and ETFs, being passively managed, are subject to lower caps still, since there’s minimal active research cost to justify a higher fee.

Direct plan versus regular plan expense ratio

Every mutual fund scheme offers a Direct Plan (purchased straight from the AMC, without a distributor) and a Regular Plan (purchased through an intermediary who earns a commission). The commission paid to the distributor in a Regular Plan is built directly into that plan’s expense ratio, meaning a Regular Plan’s expense ratio is higher than the Direct Plan of the identical underlying scheme, even though both plans hold exactly the same portfolio. The difference, commonly in the range of 0.5 to 1 percentage point depending on the fund, goes entirely to the distributor, not toward any additional management or research.

Why a small percentage difference compounds into a large amount

Consider two identical funds, one charging a 0.5% expense ratio and another charging 2%, both delivering the same 12% gross annual return before fees. After fees, the first fund delivers roughly 11.5% net, the second roughly 10% net. Invested at ₹10,000 a month over 25 years, that 1.5 percentage point gap in net return compounds into a substantial difference in the final corpus, often amounting to a meaningful fraction of the total accumulated wealth, purely from the fee difference, with the underlying investment performance held identical.

This is the core reason expense ratio deserves real attention when comparing funds within the same category: for two funds pursuing a similar strategy with similar underlying holdings, the one with the lower expense ratio has a structural, compounding advantage over long periods, independent of any skill difference between fund managers.

When a higher expense ratio might still be justified

Expense ratio shouldn’t be the only factor in choosing a fund; a fund charging more but consistently delivering enough additional net return, after fees, to justify the cost can still be the better choice. The key word is “consistently” and “after fees”, a fund’s higher gross return needs to actually survive its higher costs and hold up across multiple market cycles, not just a single strong year, before a higher expense ratio can be considered worth paying for.

Bottom Line

Expense ratio is a recurring, automatically deducted cost that directly reduces your net return every single year you stay invested, and even a seemingly small percentage difference compounds into a genuinely large amount over long horizons. Checking a fund’s expense ratio, and specifically confirming you’re looking at the Direct Plan rather than the Regular Plan if you’re investing without an advisor, is one of the simplest, most reliable ways to improve long-term investment outcomes.

This article is for general information and isn’t personalized investment advice. Mutual fund investments are subject to market risk; read the scheme-related documents carefully before investing.