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What compounding is, the magic of compound interest, and the benefit of investing early — a complete guide.
Published by The Retail Trader · AUG 04, 2026 · Features
What compounding is, the magic of compound interest, and the benefit of investing early — a complete guide.
Compounding = Returns on returns. When your profit is reinvested and, the next year, you earn profit on top of the profit as well.
Einstein reportedly said: "Compound interest is the eighth wonder of the world."
Keep these nine points in mind:
• ₹1,00,000 invested @ 12% for:
• • 5 years: ₹1,76,000
• • 10 years: ₹3,10,000
• • 15 years: ₹5,47,000
• • 20 years: ₹9,65,000
• • 25 years: ₹17,00,000
• • 30 years: ₹29,96,000
• ₹1 lakh → ₹30 lakh in 30 years (without adding anything!)
Person A: Starts at 25:
• Age 25-35: ₹5,000/month SIP (10 years)
• Age 35-60: No more investment
• Total invested: ₹6,00,000
• At 60: ₹5.4 Crore
Person B: Starts at 35:
• Age 35-60: ₹5,000/month SIP (25 years)
• Total invested: ₹15,00,000
• At 60: ₹4.8 Crore
Person A invested ₹9 LAKH LESS but has ₹60 LAKH MORE!
That's the power of starting early.
Keep these four points in mind:
• ₹5,000 — 10 Years: ₹11.6L, 20 Years: ₹49.9L, 30 Years: ₹1.76 Cr
• ₹10,000 — 10 Years: ₹23.2L, 20 Years: ₹99.8L, 30 Years: ₹3.52 Cr
• ₹25,000 — 10 Years: ₹58.0L, 20 Years: ₹2.50 Cr, 30 Years: ₹8.80 Cr
• ₹50,000 — 10 Years: ₹1.16 Cr, 20 Years: ₹5.00 Cr, 30 Years: ₹17.6 Cr
Assumption: 12% annual returns
Rule of 72:
• Years to double = 72 / Return Rate
• 12% returns → 72/12 = 6 years to double
• 15% returns → 72/15 = 4.8 years to double
• 8% returns → 72/8 = 9 years to double
Rule of 114:
• Years to triple = 114 / Return Rate
• 12% returns → 114/12 = 9.5 years to triple
Stopping your SIP = breaking compounding. Continue, even in bear markets.
Withdrawal = removing the fuel of compounding.
"I'll sell everything and buy lower" — Most people time it wrong. Stay invested.
1% expense = ₹57 lakh less over 30 years. The expense ratio has a very big impact on compounding.
Keep these points in mind:
• 📌 COMPOUNDING
• 📊 Returns on returns — 8th wonder
• 📊 ₹1L @ 12% = ₹30L in 30 years
• RULE OF 72:
• 📊 Years to double = 72 / Return %
• 📊 12% → 6 years to double
• SIP + COMPOUNDING:
• 📊 ₹5K/month, 30 years, 12% = ₹1.76 Cr
• 📊 ₹10K/month, 30 years, 12% = ₹3.52 Cr
• 📊 ₹25K/month, 30 years, 12% = ₹8.80 Cr
• EARLY vs LATE:
• 📊 Start at 25, invest 10 years = ₹5.4 Cr
• 📊 Start at 35, invest 25 years = ₹4.8 Cr
• 📊 Early start wins by ₹60L!
• ENEMIES:
• ❌ Stopping SIP
• ❌ Withdrawing early
• ❌ Timing the market
• ❌ High expense ratio
Keep these points in mind:
• SIP vs Lump Sum | Financial Planning | Mutual Fund Types
The Retail Trader — educational market analysis. Not investment advice.
This article is for educational purposes only — it is not a buy or sell recommendation, makes no claim of guaranteed returns, and is not advisory in any way. Rules, rates and mechanics change from time to time at the exchanges, SEBI and the RBI, so verify every number yourself with your broker or an official source.