The big idea
Compounding is slow, then sudden, and you can't buy back the years you waited.
What compounding actually means
You earn returns on your money, and later you earn returns on those returns too. Early years feel boring. Later years feel like magic, but only if you don't stop.
Rule of 72
At 12% return, money doubles about every 6 years
72 ÷ 12 = 6. Useful for mental maths, not a promise.
The cost of waiting
₹10k/month from age 25
- Roughly ~₹6.5 Cr by 60
- Assumes ~12% average return
- Illustration only
Same SIP from age 35
- Roughly ~₹1.9 Cr by 60
- Ten fewer years of compounding
- Illustration only
Pay yourself first
Set a SIP on salary day, before rent, Swiggy, and "just this once" sales. Start with an amount you can keep for years, not one that impresses your friends.
Raise your SIP when your salary rises. A 10% step-up each year often matches appraisal season. You barely feel it, but your freedom date moves a lot.
Aman's chapter
Before any SIP, Aman's tracker said he may never reach freedom. He starts ₹10,000 a month with a 10% yearly step-up.
That alone moves his path to: he could be free around age 60. Not perfect yet, but the curve finally points up.
Go deeper: lumpsum vs SIP
A lumpsum when markets are high can sting. SIP spreads purchases across months, so you buy more units when prices dip. For most salaried people, SIP + step-up is the default habit.
Returns are assumptions, not guarantees. Last reviewed: 2026-10-18
Common mistakes
- Stopping SIP during a crash, which is exactly when units get cheaper.
- Choosing a SIP amount so high you quit in six months.
- Waiting for the "perfect" time to start.
Do this today
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Automate a sustainable SIP, step it up yearly, and don't stop in scary headlines.
Next lessonWhere to invest: own the market, cheaply