Your Mutual Fund’s Expense Ratio Is the AMC’s Paycheque. Here Is the Math
Whether your fund returns 25% this year or loses 10%, the expense ratio it charges stays the same rate. You never get a bill for it. You never write a cheque. Yet it is the main way the company running your fund earns its income.
So where does that money go, and who keeps it?
The one-line model
An asset management company (AMC) earns a fee on the money it manages. In simple terms:
AMC revenue = average AUM x fee rate
AUM is assets under management, the total value of investor money sitting in a scheme. The fee rate is the expense ratio, charged as a percentage of the scheme’s daily net assets and built into the scheme’s NAV. That is why you never see it as a separate deduction. The NAV you check every day is already net of cost.
The fee is tied to the size of the fund, not to how well the fund did. That single fact explains much of how AMCs behave.
A worked example
Here is a simple, illustrative case. This is not a real fund, and the 1.00% rate is an assumption chosen to keep the arithmetic clean.
Scenario A: a normal year
- Scheme AUM: Rs 10,000 crore
- Expense ratio: 1.00% a year
- AMC revenue from this scheme: Rs 100 crore
Scenario B: markets fall 20%
- Scheme AUM falls to Rs 8,000 crore, assuming no inflows or redemptions
- Same 1.00% fee rate
- AMC revenue: Rs 80 crore
The AMC loses Rs 20 crore of income without changing anything it does. Falling markets hurt AMCs directly, because their revenue rides on the value of the assets.
Now flip it. Suppose the fund trails its benchmark by 3 percentage points but its AUM holds steady. The AMC’s revenue does not change.
This is slowly changing at the edges. SEBI now allows schemes to introduce performance-linked base expense ratios, subject to conditions set by the regulator. For now, though, size remains the engine of AMC revenue.
What changed on 1 April 2026
If you read about expense ratios last year, some of it is out of date. SEBI’s board approved the new framework on 17 December 2025, and the SEBI (Mutual Funds) Regulations, 2026 were notified on 14 January 2026. They replaced the 1996 framework and came into force on 1 April 2026.
The key changes for expense ratios:
- The cap is now called the Base Expense Ratio (BER). It covers the AMC’s management fee and specified scheme operating expenses, and excludes statutory and regulatory levies such as GST, STT or CTT, stamp duty, SEBI fees and exchange fees. Those are charged on actuals, over and above the permitted brokerage limits.
- Total Expense Ratio (TER) is now the sum of BER, brokerage and transaction costs, plus regulatory and statutory levies.
- Caps came down. The table below shows the key changes. For open-ended equity schemes, caps in between the two ends step down slab by slab.
- An extra 5 basis points that schemes with exit loads were earlier allowed to charge has been removed.
The new BER excludes statutory levies, so the old and new columns are not a like-for-like comparison.
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One honest caveat before you tell anyone that fees fell by 15 basis points. The headline reduction partly reflects the exclusion of statutory levies from the base ratio, rather than a deep cut in underlying fees. Taxes and levies are now shown separately. Compare schemes on the all-in TER, not on BER alone.
Why bigger funds charge less
The slab design is meant to let investors in larger schemes benefit from economies of scale. The maximum permissible fee steps down as a scheme grows, though each lower rate applies to the slice of assets in that slab, not to the fund’s entire AUM.
Run that through our example. If a scheme grows ten times, the AMC’s revenue does not grow ten times, because the allowed fee rate steps down along the way. Growth still pays, but the payoff gets smaller per rupee as a scheme gets bigger.
Where the money goes
The AMC does not pocket the entire expense ratio. The BER covers the AMC’s fee for managing the scheme and specified operating expenses. In a regular plan, the commission paid to the distributor who sold the fund is one of those operating expenses.
On top of that, GST is charged. Fund house disclosures currently put the GST rate at 18%, applied to the base expense. Brokerage and trade-related statutory charges are accounted for separately.
How that total divides between the AMC, the distributor and other costs differs by scheme. The scheme information document and the fund house’s TER disclosure page show the exact figures.
Regular vs direct: what the fee gap does to your corpus
Every mutual fund scheme can come in two versions. A regular plan includes the distributor’s commission in its expense ratio. A direct plan does not, so it runs at a lower cost for the same portfolio and the same fund manager.
Here is what a cost gap does over time. These numbers are an illustration with assumed returns, not a forecast.
- Monthly SIP: Rs 10,000 for 15 years, so Rs 18 lakh invested
- Direct plan assumed return: 12% a year
- Regular plan assumed return: 11% a year, a 1 percentage-point gap assumed for illustration
- Contributions at the start of each month, constant returns, compounded monthly at the annual rate divided by 12
One percentage point looks trivial in any single year. Compounded over 15 years, it is not. Actual gaps vary by scheme, so check the real numbers for your fund.
This does not mean direct is automatically right for everyone. A regular plan pays for distribution and, in many cases, for advice and hand-holding. Investors who would otherwise panic-sell in a crash, or never start an SIP at all, may get real value from that service. The point is to know what you are paying for, not to assume the cost is zero.
Why AMCs chase AUM
Once you see the formula, AMC behaviour stops being mysterious. Revenue rises when AUM rises. AUM rises from two sources: market gains and fresh money. An AMC controls neither the market nor your decisions, but it can compete hard for fresh money. That is one reason fund houses run SIP campaigns, keep adding schemes and spend heavily on visibility.
None of that makes AMCs villains. A business that earns a percentage of assets is rational to want more assets. It simply means their incentives and yours overlap but are not identical. You want returns after cost. The AMC earns on assets.
How to use this as an investor
- Check the all-in TER, not just the BER. Since April 2026, levies sit on top of the base number, so the base figure alone understates what you bear.
- Check the plan type. Know whether you are in a regular or direct plan, and why.
- Look at the AUM trend. A fast-growing fund should, in principle, move into lower marginal expense slabs. If its expense ratio does not fall, ask why.
- Compare within the same category. An index fund and an active small-cap fund have different cost caps for a reason.
- Ask what the fee buys. A higher fee is only worth paying if returns, service or both earn it back.
The expense ratio never shows up as a line item on your statement. That is exactly why it deserves your attention.
Disclaimer: This article is for educational purposes only and is not investment advice. All figures in the worked examples are illustrative assumptions, not real fund data or forecasts. Mutual fund investments are subject to market risks. Read all scheme-related documents carefully before investing.
