Every investor knows compounding can grow wealth, but many miss how quickly it changes the picture. In the first few years, most of the portfolio comes from the money you put in each month.
As the corpus grows, the returns start earning their own returns. By the time you have a few crores, the growth is driven more by the money already in the account than by new contributions.
For example, a monthly SIP of ₹70,000 at 12% annual return builds ₹1.1 crore in 7 years 11 months. At that point, 60% of the corpus is from your own money and 40% from investment gains. By the time the portfolio reaches ₹11 crore, only 6% of the last ₹1.1 crore comes from new SIPs while 94% comes from compounding, and this milestone is reached after 23 years 8 months.
The table below shows how the share of investment returns rises with each ₹1.1 crore milestone: 1.1 crore – 40% returns, 2.2 crore – 69% returns, 3.3 crore – 79% returns, 4.4 crore – 85% returns, 5.5 crore – 87% returns, 6.6 crore – 90% returns, 7.7 crore – 91% returns, 8.8 crore – 92% returns, 9.9 crore – 93% returns, 11 crore – 94% returns.
This pattern is called the 8‑4‑3 rule. The first ₹1.1 crore takes almost 8 years, the second takes about 4 years, and the third takes roughly 3 years. After about 20 years, the portfolio can add nearly ₹1.1 crore every year.
The most striking part is the final stretch. Moving from ₹9.9 crore to ₹11 crore takes only 10 months, even though the monthly SIP remains ₹70,000. The only difference is a larger corpus that keeps earning more.
The biggest threat to compounding is impatience. Many investors stop their SIPs after a few years because they think growth is slow. In reality, the early years are when your own contributions dominate, and the later years are when returns become the main driver.
That is why financial planners say "time in the market" matters more than "timing the market.\