Of all the ideas in long-term investing, compounding is probably the most talked about and the least intuitively understood. The simplest way to describe it: compounding is what happens when the returns your money earns start earning returns of their own.
Imagine two investors. Investor A starts an investment at age 25 and stops adding to it at age 35 — ten years of contributions. Investor B waits until age 35 to start and continues contributing every year until age 60 — twenty-five years of contributions. Depending on the assumed rate of return, Investor A, despite contributing for far fewer years, can end up with a comparable or even larger corpus at retirement than Investor B, purely because their money had more years to compound. This is illustrative, not a promise of any specific outcome — actual results depend on the scheme, market conditions and the rate of return actually achieved, none of which are guaranteed.
New investors often spend a lot of energy trying to find the “right time” to invest — waiting for a market dip, or a better scheme, or more spare cash. In practice, the years lost to waiting are often more costly than a few percentage points of return missed by imperfect timing. This is one reason SIPs are popular: they remove the need to time the market altogether, replacing it with a habit of regular investing.
The flip side of compounding is that it needs an uninterrupted runway to work. Frequently redeeming and re-investing, or pausing a SIP every time the market gets volatile, resets the clock in ways that can meaningfully reduce the long-term effect. This is why goal-linked investing — tying an investment to a specific date, and only touching it as that date approaches — tends to work better than reactive, short-term decision-making.
Curious what a given SIP or lump sum amount could look like over different time periods? Our Calculators page lets you try a few illustrative scenarios based on an assumed rate of return that you can adjust yourself.
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