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The One Idea Behind All Investing: Compounding

beginner7 min read

Why money that earns money that earns money is the most powerful force in finance.

CompoundingEarning returns on your returns — growth that accelerates over time. is simple to state and almost impossible to feel: your returns start earning their own returns. The interest earns interest. The slice grows, and the bigger slice grows faster.

Example₹1,00,000 growing at 12% a year. Year 1 adds ₹12,000. But year 2 grows the new ₹1,12,000, adding ₹13,440 — more than year 1, without you doing anything. By year 30 that ₹1 lakh is about ₹30 lakh. You contributed ₹1 lakh; compoundingEarning returns on your returns — growth that accelerates over time. contributed the other ₹29 lakh.
Future value = P × (1 + r)^n
P = amount invested, r = annual return, n = years. The magic is the exponent n — time is the lever that matters most.
The curve barely moves for years, then bends almost straight up. Most of compoundingEarning returns on your returns — growth that accelerates over time.’s payoff arrives late — which is exactly why starting early beats investing more. Ten years of a head start can outweigh a far larger sum invested later.

This is why every patient investor sounds like a broken record about “time in the market.” It is not folklore — it is the math of the exponent quietly doing the heavy lifting while you wait.

Common mistake“I’ll start investing once I earn more.” The costliest sentence in personal finance. A small amount started now usually beats a big amount started in ten years, because the early years buy you the most compoundingEarning returns on your returns — growth that accelerates over time..
Key takeawayCompoundingEarning returns on your returns — growth that accelerates over time. makes returns earn returns; its biggest gains come late, so the single highest-leverageControlling a large position with a small amount of money. move is to start early and let time run.
FAQs
What return should I assume for compounding?

Be conservative. Indian equity has historically delivered roughly 11–13% over long periods, but use 10–11% for planning and treat anything higher as a bonus. For FDs/debt, 6–7%. The exact number matters less than the years you give it.

Does compounding work against me too?

Yes — with debt. Credit-card interest at 36–42% compounds against you just as fiercely as investments compound for you. The same force, pointed the wrong way.