Lumpsum or SIP — see year-wise growth, total invested, interest earned, and inflation-adjusted real value.
Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal plus all accumulated interest — interest earns interest. Over long periods, this difference is enormous. ₹1,00,000 at 12% simple interest for 20 years grows to ₹3,40,000. The same amount at 12% compounded annually grows to ₹9,64,629 — nearly 3× more. Albert Einstein is often (apocryphally) quoted calling compound interest "the eighth wonder of the world."
A Systematic Investment Plan (SIP) invests a fixed amount monthly regardless of market conditions. When markets are high, your money buys fewer units; when markets are down, your money buys more units — this is called rupee cost averaging, and it smooths out the effect of market volatility over time. Lumpsum investing works best when you have a large sum available and invest it at market lows. For most salaried individuals, SIP is the more practical and psychologically sustainable approach — it matches the income cycle and removes the need to time the market.
₹10,00,000 in 10 years is not the same as ₹10,00,000 today. If inflation runs at 6% per year, the real purchasing power of ₹10,00,000 received in 10 years is equivalent to approximately ₹5,58,395 in today's money. This is why the inflation-adjusted (real) return matters for retirement and long-term goal planning — your investment must not just grow in nominal terms, but outpace inflation. The real return rate = [(1 + nominal rate)/(1 + inflation rate)] − 1.
Starting a ₹5,000/month SIP at age 25 vs age 35 (both until age 60), assuming 12% CAGR: starting at 25 gives 35 years of compounding — total invested ₹21L, final value approximately ₹3.24 crore. Starting at 35 gives 25 years — total invested ₹15L, final value approximately ₹94 lakh. The extra 10 years (₹6L more invested) produces ₹2.3 crore more. Time in the market is the most powerful factor in wealth building.