The expense ratio: what one percent takes over ten years
It is already deducted before the NAV you see. That is why it feels like it costs nothing — and why so few people ever work out what it took.
The expense ratio is what a fund charges you to run it — the manager, the research, the registrar, the marketing, the distributor if there is one. It is quoted as a percentage a year.
Why you never see it
No bill arrives. Nothing is deducted from your folio. The charge is taken inside the fund, before the NAV is published — a small slice every single day.
So the NAV you see is already net of it. The return you calculate from that NAV is already net of it. You are paying it, continuously, and there is no line anywhere that says so.
This is the single most important thing to understand about fund costs: the reason it feels like it costs nothing is that it is designed never to appear.
What it comes to
Take ₹10,00,000, a fund earning 12% before costs, held for twenty years.
| Expense ratio | Net return | After 20 years | Cost of the fee |
|---|---|---|---|
| 0.20% (an index fund) | 11.80% | ₹93,20,000 | — |
| 0.80% (typical direct, active) | 11.20% | ₹83,60,000 | ₹9,60,000 |
| 1.80% (typical regular, active) | 10.20% | ₹69,70,000 | ₹23,50,000 |
The gap between the first row and the last is more than twice the original investment. Nobody wrote a cheque for it. It was taken a fraction of a paisa at a time, daily, for twenty years.
Round numbers, chosen so the arithmetic is visible. The point is not the exact figure — it is the order of magnitude, and the order of magnitude surprises almost everybody.
Does a higher fee buy anything?
Sometimes. A fund charging 1.8% has to beat one charging 0.2% by 1.6 percentage points a year just to draw level. Some managers have done that over long periods. Many have not, and the ones who have are not reliably identifiable in advance — which is the uncomfortable part.
We are not going to tell you which to hold. What we would say is that the fee is certain and the outperformance is uncertain, and it is worth knowing which side of that trade you are on.
Where the number differs
- Direct vs Regular — the same fund, 0.5% to 1.2% apart, because one pays a distributor. We wrote about that separately.
- Active vs index — an index fund has nobody choosing stocks, so it charges a fraction.
- Fund size — SEBI caps the ratio in slabs, and large funds charge less as a percentage.
- Debt vs equity — debt funds charge less, and on a 7% return a 1% fee takes a much larger share of what there is.
Looking it up
Every fund page here shows the expense ratio for each plan, from the fund's own filing. The thing worth doing is looking at the Direct and Regular plans of the fund you already hold, together, and working out what the difference has taken from you so far.
Analysis, not advice. The tables above are worked examples with round numbers, not projections.