What a 1% Expense Ratio Costs Over 20 Years
- How the fee is actually taken
- The same SIP, two expense ratios
- Why the gap grows faster than time
- Where the one-point gap comes from
- How to compare fees properly
- A quick way to estimate your own drag
- Where this fits
A mutual fund’s expense ratio is deducted from the fund every day, so it reduces the return you compound on, not just the amount you invest. Over twenty years a one-percentage-point difference in annual cost on a ₹10,000 monthly SIP leaves you with roughly ₹9.6 lakh less, about 11% of the final value, even though the fee sounds like a rounding error in any single year.
The number is large because the fee is charged on the whole growing balance, every year, including on the returns earlier fees would have earned.
How the fee is actually taken
You never see an expense ratio as a bill. The fund house accrues it daily against the fund’s assets, and the published NAV is already net of it. A fund whose underlying portfolio earned 12% in a year and charges 1.5% will show you something close to 10.5%.
That is why the cost is easy to ignore. Your statement shows a return, not a deduction, and there is no line telling you what the return would have been with a cheaper fund.
The same SIP, two expense ratios
Assume the underlying portfolio earns 12% a year before costs, and compare two ways of holding it:
- Fund A charges 0.5%, so your net return is 11.5%.
- Fund B charges 1.5%, so your net return is 10.5%.
Invest ₹10,000 a month for 20 years, ₹24 lakh in total.
| Net return | Value after 20 years | |
|---|---|---|
| Before any cost | 12.0% | ₹91,12,000 |
| Fund A, 0.5% expense ratio | 11.5% | ₹85,82,000 |
| Fund B, 1.5% expense ratio | 10.5% | ₹76,20,000 |
| Difference, A minus B | ₹9,63,000 |
The gap is 11.2% of Fund A’s final value. Put differently, over twenty years the extra percentage point consumed about 40% of everything you invested.
Computed with monthly contributions at the end of each month and each annual return converted to an equivalent monthly rate. Returns are held constant for illustration; real returns vary every year, but the fee is deducted in good years and bad.
Why the gap grows faster than time
| Horizon | Fund A at 11.5% | Fund B at 10.5% | Gap as share of A |
|---|---|---|---|
| 10 years | ₹21,62,000 | ₹20,52,000 | 5.1% |
| 20 years | ₹85,82,000 | ₹76,20,000 | 11.2% |
| 30 years | ₹2,76,51,000 | ₹2,27,32,000 | 17.8% |
Doubling the horizon from ten to twenty years more than doubles the percentage gap, and the rupee gap goes from about ₹1.1 lakh to ₹9.6 lakh to ₹49 lakh. Fees compound exactly like returns do, in the wrong direction.
For a single lump sum the effect is even larger, because the whole amount is exposed to the fee for the full period. ₹10 lakh left for twenty years at 11.5% grows to about ₹88.2 lakh; at 10.5% it grows to about ₹73.7 lakh. The one-point fee gap costs ₹14.5 lakh, over 16% of the better outcome.
Where the one-point gap comes from
The most common source is the plan you hold rather than the fund. Every mutual fund scheme is offered in a regular plan, sold through a distributor whose commission is paid out of the expense ratio, and a direct plan without that commission. Same portfolio, same manager, different costs. The side-by-side is in direct vs regular mutual fund.
The second source is the kind of fund. Actively managed equity funds generally charge more than index funds tracking the same market, so the question becomes whether the manager adds enough to cover the difference after costs. That is discussed in active vs index fund.
Check the current expense ratio of any fund you hold on its latest factsheet or the fund house’s website. It is disclosed and it changes, so a figure quoted in an article or by a friend may be out of date.
How to compare fees properly
- Compare like with like. A 0.2% index fund and a 1.2% small-cap fund are not substitutes; the fee comparison only decides between two ways of getting the same exposure.
- Compare net returns, not gross. What matters is what you keep. A more expensive fund that genuinely beats a cheaper alternative by more than its extra cost over long periods is not a bad choice. The difficulty is knowing that in advance.
- Treat fees as certain and outperformance as uncertain. The expense ratio will be charged every year. Any extra return is a hope. Weight them accordingly.
- Remember that switching has its own costs. Redeeming an existing holding to move to a cheaper plan can trigger an exit load and a tax liability. Work out both before switching, and consider directing only new SIP instalments to the cheaper plan.
A quick way to estimate your own drag
A rough rule: the share of your final corpus lost to a fee gap is close to the fee gap multiplied by the average number of years your money is invested. For a 20-year SIP, the average rupee is invested for about ten years, so a 1% gap costs somewhere around 10%, which matches the 11.2% computed above. For a 20-year lump sum, every rupee is invested for 20 years, and the cost is correspondingly larger.
It is an approximation, not a formula, but it is enough to tell whether a fee difference matters for your horizon before you run the exact numbers.
Where this fits
- The plan choice that usually creates the gap: direct vs regular mutual fund
- Run your own numbers: SIP calculator · lump sum calculator
- Measuring the return you actually earned: XIRR or CAGR
- The broader picture: mutual funds in India