When 40% SIP Returns Don't Mean What You Think

A headline announcing that the top eight equity mutual funds delivered more than 40% returns on SIP investments in one year is bound to attract attention. For an investor putting ₹10,000 a month, the illustration of the investment growing to around ₹145,000 sounds particularly enticing.

But there is a small piece of mathematics that investors need to understand before celebrating the 40%.

If ₹10,000 is invested every month for 12 months, the investor has contributed ₹120,000. If the value at the end is ₹145,000, the actual gain is ₹25,000, or 20.8% of the total amount contributed.

So how can the return be reported as more than 40%?

There is nothing wrong with the calculation.

SIP returns are annualised, taking into account the fact that the money was invested at different points in time. The first ₹10,000 has been invested for almost a year; the last ₹10,000 for only about a month. The appropriate measure therefore takes the timing of each cash flow into account, typically through XIRR.

The problem is not the mathematics. It is the headline.

A 40% annualised SIP return does not mean that ₹120,000 invested by the investor has earned 40%, or ₹48,000. It means that the sequence of monthly investments and the eventual value produces an annualised return of that magnitude.

That distinction becomes important when markets reverse.

Suppose the ₹145,000 portfolio subsequently falls by ₹10,000. Its value is now ₹135,000. The investor's actual gain on the ₹120,000 contributed has fallen from ₹25,000 to ₹15,000. Another ₹10,000 decline reduces the gain to just ₹5,000.

The annualised SIP return would also fall, but its precise movement depends on when those gains or losses occur. That is precisely why a one-year annualised number should not be mistaken for a guaranteed or stable rate of wealth creation.

Indeed, AMFI itself cautions that rupee-cost averaging does not assure a profit or protect an investor against losses in a declining market.

There is another reason for caution.

A one-year SIP return is an unusually short period over which to judge an equity investment. AMFI's own material illustrates how widely SIP returns can vary at shorter horizons, with the range narrowing as the investment horizon lengthens.

None of this diminishes the value of SIPs. Quite the contrary. SIPs are a disciplined mechanism for investing periodically and avoiding the temptation to time the market. But discipline should not be confused with protection from market risk.

The investor therefore needs to ask for three numbers, not one:

How much did I invest? What is it worth today? What is my absolute gain or loss?

The annualised SIP return can then be shown alongside these numbers.

In the ₹10,000-a-month example, the honest presentation would be:

Total invested: ₹120,000| Current value: ₹145,000| Absolute gain: ₹25,000 | Annualised SIP return: 40%-plus.

All four numbers are true. But they tell very different stories when presented separately.

There is no case for banning XIRR or questioning its mathematics. The case is for better financial communication.

A technically correct number should not be allowed to create an economically incorrect impression.

For investors, the rule is simple: never be seduced by the percentage alone. Ask what you put in, what you got out, and over what period.

In investment reporting, the return matters.

But the rupees matter more.