What Is Expense Ratio in Mutual Funds? Why It Matters More Than Returns
Expense ratio is the single most predictable factor in mutual fund performance. Unlike returns (which vary wildly), expense ratio is a guaranteed annual drag on your corpus. A fund charging 1.5% (Regular plan) versus 0.5% (Direct plan) costs you ₹18.2L on a ₹10,000 monthly SIP over 20 years. That is not a theoretical loss — it is real money silently transferred from your corpus to the AMC and distributor every single day. Yet most Indian investors cannot name the expense ratio of any fund they own. This guide makes you fluent in the one number that separates informed investors from everyone else.
By Ojasvi Malik
How Expense Ratio Works — Daily NAV Deduction
Expense ratio is expressed as an annual percentage but deducted daily from the fund's NAV. If a fund has a 1% expense ratio, approximately 0.00274% (1% ÷ 365) is deducted from the NAV every single day. You never see a separate charge on your statement — it is invisibly embedded in the NAV. When you see a fund's NAV at ₹150.00, it has already been reduced by that day's expense. This is why Direct plans always have a higher NAV than Regular plans of the same fund — the Regular plan's NAV is dragged lower by the additional distributor commission embedded in its expense ratio.
The 20-Year Compounding Cost
The table below shows how different expense ratios erode a ₹10,000/month SIP over time, assuming a gross return of 13% before expenses.
| Expense Ratio | 10Y Corpus | 20Y Corpus | Cost vs 0.3% Baseline |
|---|---|---|---|
| 0.3% (Best Index Funds) | ₹24.5L | ₹1.16 Cr | — (baseline) |
| 0.5% (Good Direct Plans) | ₹24.0L | ₹1.11 Cr | ₹5.0L lost |
| 1.0% (Average Direct Plans) | ₹22.8L | ₹1.00 Cr | ₹16.0L lost |
| 1.5% (Regular Plans) | ₹21.7L | ₹89.5L | ₹26.5L lost |
| 2.0% (Expensive Regular) | ₹20.6L | ₹80.1L | ₹35.9L lost |
SEBI Maximum Expense Ratio Limits
SEBI caps expense ratios based on fund AUM. For equity funds: up to ₹500 Cr AUM, maximum 2.25%; ₹500-750 Cr, 2.00%; ₹750-2000 Cr, 1.75%; and so on, declining with scale. For index funds and ETFs, the limit is lower. In practice, competition has driven Direct plan expense ratios well below SEBI limits — most large-cap Direct plans charge 0.3-0.8%, and index funds charge 0.1-0.3%. The difference between Direct and Regular is the distributor commission, which SEBI allows AMCs to pay from the expense ratio. This commission — your money — is why banks push Regular plans.
The 1% Rule — When Active Funds Justify Higher Expense
An active fund charging 0.8% expense ratio must beat the index by at least 0.8% consistently to justify its cost over a 0.05% index fund. In Indian markets, many active large-cap funds fail this test — after expenses, they underperform the Nifty 50 index fund over 5-10 year periods. However, in mid-cap and small-cap categories, skilled active managers still deliver 2-4% alpha over benchmarks, easily justifying a 0.5-1% expense ratio. The rule: for large-cap, prefer index funds with 0.1-0.3% expense. For mid/small-cap, active management at under 1% expense can add genuine value.
lightbulbKey Takeaways
- ✓Expense ratio is deducted daily from NAV — you never see a separate charge, making it invisible to most investors
- ✓A 1% higher expense ratio costs ₹26.5L on a ₹10,000/month SIP over 20 years
- ✓Direct plans are 0.5-1.5% cheaper than Regular plans — this is the distributor commission you pay silently
- ✓For large-cap: index funds at 0.1-0.3% beat most active managers after expenses over 10 years
- ✓For mid/small-cap: active management at under 1% expense ratio can still add genuine alpha
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Frequently Asked Questions
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Disclaimer: This article is for educational and informational purposes only. It does NOT constitute investment advice. Return data shown is historical and past performance is not indicative of future results. Vijay Malik Financial Services is an AMFI-registered Mutual Fund Distributor (ARN-317605) and is NOT a SEBI-registered Investment Adviser. Please consult a qualified financial advisor before making investment decisions.