What Is SIP Compounding?
SIP compounding refers to the process where the returns earned on your SIP investments are reinvested automatically, and those reinvested returns also earn returns in subsequent periods. In mutual fund SIPs, there is no separate reinvestment step; all returns are automatically reflected in the rising NAV of the fund, and your accumulated units continue to benefit from this growth. Over long periods, compounding causes wealth to grow exponentially rather than linearly.
How Compounding Works in SIP
Example: Rs 5,000 monthly SIP in an equity fund returning 12% annually:
- Year 1: Total invested Rs 60,000; corpus approximately Rs 63,800 (small compounding at this stage).
- Year 5: Total invested Rs 3,00,000; corpus approximately Rs 4,08,000 (beginning to see compounding effect).
- Year 10: Total invested Rs 6,00,000; corpus approximately Rs 11,60,000 (compounding creating significant gap).
- Year 20: Total invested Rs 12,00,000; corpus approximately Rs 49,96,000 (compounding doing heavy lifting).
- Year 30: Total invested Rs 18,00,000; corpus approximately Rs 1,76,00,000 (compounding generates 10x the invested amount).
Why the Last Years of SIP Generate the Most Wealth
The wealth generated in Years 25-30 of a SIP is greater than the wealth generated in Years 1-20 combined. This is because the large corpus accumulated over 20 years generates enormous absolute returns even at the same 12% rate:
- Year 20 corpus: Rs 50 lakh. One year of returns at 12%: Rs 6 lakh.
- Year 30 corpus: Rs 1.76 crore. One year of returns at 12%: Rs 21 lakh.
This is why starting early and staying invested is far more valuable than any other investment optimisation.
Rule of 72 Applied to SIP
The Rule of 72 states that money doubles every (72 / return rate) years. At 12% annual return, your SIP corpus doubles approximately every 6 years. A corpus of Rs 50 lakh at year 20 becomes Rs 1 crore by year 26, and Rs 2 crore by year 32, illustrating compounding's accelerating effect.
Key Takeaway
Compounding in SIP is the reason why long-term investors build enormous wealth from relatively modest monthly investments. Starting early, staying invested, and never interrupting the compounding chain through premature withdrawals are the three cardinal rules. Use the Lemonn app to visualise the compounding effect on your SIP portfolio and stay motivated by seeing how wealth grows exponentially over time.
