You are making a systematic investment plan (SIP) of ₹5,000 every month. For you, it may be a step towards disciplined investing. For the mutual fund industry, it is an invaluable recurring inflow. Because your money is systematically invested, barring an active decision to the contrary, it makes SIPs a great tool to not only build financial discipline but also generate a steady income for asset managers.

Mutual Funds Do Not Typically Earn From Transactions

A stockbroker may earn when a trade happens. An asset manager has to make money out of thin air when a fund is purchased. The expense ratio, which captures the cut of assets that go to fund managers, is captured in the scheme's net asset value (NAV). "Investment management, administration, custody and other expenses permissible under the regulations are charged as a percentage of the scheme's assets under management and deducted to arrive at the NAV." (AMFI India)

Key to note is the focus on expenses being a percentage of assets. While any inflow of money is useful to a mutual fund, money parked for the long-term is far more valuable to an asset manager. ₹1 lakh invested for a decade is far more profitable than ₹1 lakh that comes in and then moves out in a month's time. The asset manager wants assets, and it wants them to stay.

SIPs Make It Easy To Automate Recurring Inflows

An investor who is thinking about making a lump sum purchase of mutual funds has to think about a lot of factors. They have weigh the pros and cons of buying at a certain price point, think if they might need the money anywhere else, and so on. With a SIP, the default option is to keep investing every month, barring a specific instruction to do otherwise. Like a subscription, the key difference being that instead of paying for content, the investor is paying to buy more units of a particular fund.

For the investor, this can be a good way to avoid being emotional about market movements and just keep buying no matter what. For the asset manager, it is a reliable way to get recurring inflows of money. This is incredibly useful because mutual fund companies are in many ways subscription-based businesses as well.

The Numbers Are Truly Impressive

India's mutual fund industry has grown exponentially in the last decade. As of May 2026, total assets under management (AUM) by the mutual fund industry stood at ₹81.58 lakh crore, up by around 13 per cent year-over-year (AMFI India). SIPs have contributed massively to this growth.

Per numbers released by AMFI, in April 2026 alone, mutual fund industry witnessed ₹31,115 crore SIP inflows. There were 9.65 crore SIP accounts and ₹16.85 lakh crore of SIP AUM as of April 2026 – representing over 20 per cent of the industry's AUM (AMFI India). This means that for every new SIP account that gets opened, thousands of crores of rupees get systematically deposited into mutual fund schemes every month before any other transaction happens. Standing instructions are financial infrastructure.

The Value Of Assets Under Management Cannot Be Overstated

Let us say, there is a fund with a AUM of ₹10,000 crore. The expense ratio of this scheme is, for the sake of simplicity, 1 per cent. The fund's expenses would be roughly ₹100 crore for the year, before adjusting for any change in AUM and inflows/outflows due to other investors buying or redeeming their shares. The investors in this fund do not see any separate charges. These expenses are baked into the NAV of the fund, and impact the returns earned by the investors.

Scale is critically important to asset managers. AUM of ₹10,000 crore can generate significantly higher revenue for a fund compared to a fund with ₹1,000 crore, even with a lower expense ratio. SEBI regulations dictate that total expenses for a given scheme cannot exceed a certain cut-off, and also caps the percentages at different AUM levels. Direct plans also have lower expense ratios because they do not factor in distribution costs (Securities and Exchange Board of India). Thus, there is a clear benefit in having more assets under management while also capping the expense ratios to stay within SEBI guidelines.

More Assets Are Good Even Without New Investors

For many asset managers, the value of existing assets is magnified manifold due to the nature of the business. If a ₹100 crore equity portfolio appreciates by 10 per cent, it becomes ₹110 crore before any additional inflows of cash. Because the expenses that mutual funds incur are a function of AUM, a rising market can lead to higher expenses even without any inflows of cash.

The reverse is also true – a drop in the market without any redemptions will also lead to a drop in AUM and by extension, revenue for the asset manager. For a given fund, revenue for an asset manager is driven by: new inflows, whether they come as one-time lump sum payments or systematic investments existing customer loyalty, the longer an investor holds their position with a given fund, the better overall performance, higher returns lead to overall higher AUM, assuming other things are equal. The first two points are directly impacted by SIPs.

Distribution Drives Expenses For Regular Plans

Mutual fund companies not only have to manage the money that they are entrusted to look after but also acquire new investors. Banks, financial planners and distributors get compensated for bringing in new investors. Regular plans have higher expense ratios because they factor in distribution costs as compared to direct plans (AMFI India). It is helpful to think of a financial planner as someone who does what a stock broker does for the mutual fund industry. The difference is that while a stockbroker facilitates a trade, a financial planner manages the entire portfolio on a continual basis.

There is a separate industry for distributing mutual funds. This is not exclusive to SIPs but is worth noting nevertheless. One mutual fund company manages an investor's money while another facilitates the distribution of that product. The investor only interacts with the mutual fund company even though multiple entities work together to get the investor to that point of investing in mutual funds.

Patient Customers Are Precious

An investor who keeps making SIP payments every month for 20 years is someone who has shown incredible patience. This can be particularly rewarding for mutual fund companies. The money that they systematically invest stays with the fund, growing in value every year. The bigger the AUM, the higher the expense ratio, even if it is a diminishing percentage. The combination of systematic investment plans and a steadily growing AUM is a recipe for success for mutual fund companies.

It is important to note, however, that the incentives are aligned differently for the two parties. The mutual fund company grows its AUM, while the individual investor grows their personal portfolio of mutual funds. The two objectives are not mutually exclusive, and as the investor grows their portfolio, the mutual fund company benefits from higher AUM. The trick is to remember that the mutual fund company is a middle-man who earns fees for managing the money of investors. As a result, the most important objective for any investor must be to build wealth, and not necessarily to benefit the mutual fund company. Your SIP is a habit that builds wealth, and for the company managing it, it is a reliable source of income with compounding benefits.