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Imagine you have 10 currency notes. You take these notes and keep them in a drawer. You don’t take the notes out of the drawer for a couple of years. Later on, when you open the drawer, there are more notes than you originally put there. You got more money by simply not touching the money you already had. This is called a fairy tale in real life. But in the world of mutual fund investments, it is called compound interest.

Compound interest means earning an interest on the interest that you have already earned. When you invest in a mutual fund, you earn a certain percentage of returns. These returns are reinvested and they earn returns as well.

Simply put, if you invest ₹100 and earn an interest of ₹10, then your total corpus becomes ₹110. The next time you earn an interest, it will be calculated on ₹110. This is how compound interest works. It rewards you for continuing investing.

Let’s say you invest ₹1 lakh every year in a mutual fund. For the sake of simplicity, we assume that the fund returns 10% every year. The following table shows how compounding interest would make your investments grow over 5 years.

Power of compounding on investment of ₹1 lakh a year for 5 years
Year Opening balance (₹) Investment (₹) 10% interest (₹) Closing balanced (₹)
1 1,00,000 10,000 1,10,000
2 1,10,000 1,00,000 21,000 2,31,000
3 2,31,000 1,00,000 33,100 3,64,100
4 3,64,100 1,00,000 46,400 5,10,500
5 5,10,500 1,00,000 61,000 6,71,500
Total investment:₹5,00,000 | Value after 5 years: ₹6,71,500 | Interest earned: ₹1,71,500

If there was no compound interest, your total investment of ₹5 lakh would have earned you ₹50,000 at 10% interest. The difference made by compounding is worth ₹1,71,500 in the above example. That’s almost 3.43 times more that you have earned.

mutual funds compounding interest

The power of compounding works even better when you increase the quantum of investment every year. Increasing investments on an annual basis is a recommended way of building wealth for the long-term.

As you grow older and your experience increases, your income will also rise. And with it, your investments should go up as well. It will make compound interest even more effective.

If you begin investing ₹1 lakh a year & increase your investment by 10% every year, this is how compounding interest will help your money grow
Year Opening balance (₹) Investment (₹) 10% Interest (₹) Closing balance (₹)
1 1,00,000 10,000 1,10,000
2 1,10,000 1,10,000 22,000 2,42,000
3 2,42,000 1,21,000 36,300 3,99,300
4 3,99,300 1,33,100 53,240 5,85,640
5 5,85,640 1,46,410 73,205 8,05,255
Total investment: ₹6,10,510 | Value after 5 years: ₹8,05,255 | Interest earned: ₹1,94,745

Again, the effect of compounding is huge, especially when you increase the investment amount every year. The more you increase your investment amount, the more effective compounding interest becomes.

If you begin investing with ₹1 lakh in the first year & increase the quantum of investment every year, this is how compounding interest will help your money grow
Yearly increase in investment (%) Total investment after 5 years (₹) Value after 5 years (₹) Interest earned (₹)
10 6,10,510 8,05,255 1,94,745
15 6,74,237 8,81,862 2,07,625
20 7,44,160 9,65,591 2,21,431

Rate of interest is taken as 10%

All of these numbers look impressive even when the rate of interest earned has been assumed to be a conservative 10%.

Equity mutual funds earn a lot more than that over the long-term. Hence, the lesson to learn here is that to create real wealth, you should stay invested in mutual funds, increase the investment amount as you can and let compound interest work its magic for you.

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If you had invested Rs 10,000
every month for last 25 years
in equity funds, you could make

₹ 3.3 Crores
at 15%* annual returns

Rs 30 Lakhs

Rs 3.3 Crores

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