SIP vs Lumpsum: Which Builds More Wealth?

If you have money to invest, you face a classic question: put it all in at once (a lumpsum), or drip it in month by month (a SIP)? Both are good. Here's how they really differ.

What each one is

A lumpsum invests a single amount in one go, so the whole sum compounds for the full period. A SIP (Systematic Investment Plan) invests a fixed amount every month, so each instalment compounds for a different length of time.

Why lumpsum usually shows a bigger number

Compare ₹6,00,000 invested as a lumpsum versus ₹5,000 a month for 10 years (also ₹6,00,000 in total), both at 12%. The lumpsum grows to about ₹18.6 lakh, while the SIP reaches about ₹11.6 lakh. The lumpsum wins simply because its full amount was compounding from day one, while the SIP's later instalments had only a few months to grow.

So why do a SIP at all?

Two reasons. First, most people don't have a large lumpsum lying idle, they invest from monthly income, and a SIP fits that perfectly. Second, a SIP spreads your purchases across market highs and lows (rupee-cost averaging), so you never invest everything right before a crash. That lowers regret and makes it easier to keep going through scary markets.

When lumpsum is the better choice

• You already have the money (a bonus, maturity payout or sale proceeds) sitting in a low-interest account.
• You have a long horizon, so short-term dips matter less.
• You won't panic if the market drops soon after you invest.

When a SIP is the better choice

• You're investing from your salary each month.
• Markets feel expensive and you'd rather not go all-in at once.
• You want a hands-off habit that keeps running automatically.

The honest answer

For a large idle sum and a long horizon, lumpsum tends to win mathematically. But a SIP you'll actually stick with beats a lumpsum you're too nervous to invest. Many people split the difference: invest part now, and set up a SIP for the rest.

Try it: the SIP Calculator projects a monthly plan, and the Lumpsum Calculator projects a one-time investment. Compare them with the Compound Interest Calculator.

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