Key takeaways
✓
Compounding means earning returns on your returns — not just your original money✓
Starting at 25 instead of 35 can produce 3x more wealth at 60✓
The Rule of 72 tells you how long to double your money at any return rate✓
At 6% inflation, ₹1 lakh today feels like ₹56,000 in 10 years✓
Compounding works against you in debt — credit card debt doubles in 2 years👨💻
ArjunAge 25·Software engineer, Bengaluru
"
I'll start investing properly once I'm settled.
Arjun starts a ₹3,000/month SIP at 25. He invests until 60 — 35 years.
👩💼
MeeraAge 35·Marketing manager, Mumbai
"
I wish I had started earlier, but I'll make up for it.
Meera starts a ₹6,000/month SIP at 35 — twice Arjun's amount. She also invests until 60.
💡
The result might surprise you
Both earn 12% annual returns. Arjun invests half as much every month. Yet at 60, Arjun has ₹3.5 crore and Meera has ₹2.1 crore. Arjun wins by ₹1.4 crore — despite contributing far less total money.
Same goal, very different outcomes
₹350L
Arjun — ₹3,000/month from age 25
₹210L
Meera — ₹6,000/month from age 35
₹ in lakhs at age 60, assuming 12% annual returns
What compounding actually means
Simple interest earns returns only on your original investment. ₹1 lakh at 10% earns ₹10,000 every year — flat. After 10 years: ₹2 lakh.
Compound interest earns returns on everything — your original amount plus all the returns you have already earned.
Year 1: ₹1 lakh → ₹1.1 lakh. Year 2: ₹1.1 lakh earns 10% → ₹1.21 lakh. Year 3: ₹1.21 lakh earns 10% → ₹1.33 lakh.
After 10 years at 10% compounding: ₹2.59 lakh. The extra ₹59,000 came from earning returns on returns.
₹1 lakh compounding at 12% over time
Each bar shows what your original ₹1 lakh becomes
5 years₹176L
10 years₹311L
15 years₹547L
20 years₹965L
25 years₹1700L
30 years₹2996L
✅
The Rule of 72 — quick mental math
Divide 72 by your annual return rate to find how many years it takes to double your money.
• FD at 7%: 72 ÷ 7 = 10.3 years to double
• Index fund at 12%: 72 ÷ 12 = 6 years to double
• Great equity fund at 15%: 72 ÷ 15 = 4.8 years to double
6 yrs
to double at 12%
Nifty 50 avg return
3.5 Cr
Arjun's corpus
₹3k/month from age 25
2.1 Cr
Meera's corpus
₹6k/month from age 35
10 yrs
the magic gap
what separates them
Why starting early beats investing more
Here is the counterintuitive truth: the first ₹3,000 Arjun invested in month one has 35 years to compound. That single ₹3,000 becomes approximately ₹1,24,000 by the time he turns 60 — a 41x return.
Meera's first ₹6,000 has only 25 years. It becomes roughly ₹1,00,000 — despite being twice as large. The time advantage more than offsets the amount advantage.
Portfolio growth over time — Arjun vs Meera
₹ in lakhs, 12% annual returns
⚠️
Compounding works against you in debt too
A credit card charging 36% annual interest doubles your debt in exactly 2 years (72 ÷ 36 = 2). A ₹50,000 credit card balance left unpaid:
• After 1 year: ₹68,000
• After 2 years: ₹92,000
• After 3 years: ₹1,25,000
Paying off high-interest debt is often the highest-return investment you can make.
Start today — it takes 10 minutes
1
Open Kuvera or Coin
Both are free, zero commission, and take 10 minutes to set up. You need a PAN card and Aadhaar.
2
Search 'Nifty 50 index fund'
Pick any — UTI, HDFC, Nippon. They all charge 0.1–0.2% and hold the same 50 companies.
3
Set a SIP for any amount
₹500 is enough to start. Set the debit date 3–4 days after your salary arrives.
4
Increase it by 10% every April
As your salary grows, grow the SIP. This step-up approach dramatically increases your final corpus.
⚠Educational content only. Numbers shown are illustrative — actual returns vary. This is not investment advice. Consult a SEBI-registered financial advisor before investing.
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Run the SIP calculator with a 20-year horizon