The Math Behind SIP Returns
Why consistency beats timing the market — the numbers that prove it.
The advice to "start a SIP" is everywhere. But most people who give it can't actually explain what makes it mathematically powerful. Here is the explanation.
What is a SIP?
A Systematic Investment Plan is simply automatic periodic investing — typically monthly. You set an amount, it gets deducted from your account, and gets invested in the fund of your choice. The investment happens regardless of market levels.
Rupee Cost Averaging
The mathematical advantage of a SIP is rupee cost averaging. When markets fall, your fixed monthly amount buys more units. When markets rise, you buy fewer. Over time, you automatically buy more at lower prices — the opposite of what emotional investors do.
Example
₹5,000/month
at 12% CAGR over 20 years grows to ₹49.6 lakhs. Total amount invested: ₹12 lakhs. Wealth created from returns: ₹37.6 lakhs. Compounding does more than you.
Why lump-sum timing fails
Study after study shows that even professional investors cannot consistently time the market. The average investor who trades based on market sentiment earns significantly less than the index over the same period.
The Dalbar Study
Over 20 years, the average US equity mutual fund investor earned 5.19% annually vs the S&P 500's 9.85%. The gap = behavior. Buying high and selling low destroys returns.
Starting early vs. starting big
A 25-year-old investing ₹5,000/month for 35 years at 12% creates ₹3.24 crore. A 35-year-old investing ₹10,000/month for 25 years at the same return creates ₹1.89 crore. Starting earlier — even with less money — wins decisively. Time is the most irreplaceable resource in compounding.
“Compound interest is the eighth wonder of the world. He who understands it, earns it; he who doesn't, pays it.”
— Albert Einstein (attributed)
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