The honest answer
Lumpsum wins on average. Across rolling 10-year windows of Indian equity history, a one-shot investment beat the equivalent SIP roughly 75% of the time. Markets drift up, so money in earlier compounds longer. That's the math.
But SIP wins for most real investors — because most people don't have a ₹12L lumpsum sitting idle, can't time the market, and panic when the screen goes red. The "better" answer depends on which problem you actually have.
When lumpsum wins
Long horizon, money already in hand, equity allocation you can stomach. Same expected 12% return — the earlier you deploy, the longer it compounds.
Example. ₹12,00,000 lumpsum invested today at 12% for 10 years grows to about ₹37,27,000. The same ₹12L spread as ₹10,000/month SIP for 10 years grows to about ₹23,23,000. The lumpsum wins by roughly ₹14L — purely because the full corpus compounded the whole decade.
When SIP wins
You don't have a lumpsum — you have a salary. SIP turns that into investing without a decision each month. In volatile or sideways years, rupee-cost averaging buys more units when prices fall, lowering your average cost. And the boring monthly auto-debit beats the spreadsheet that says "I'll start next quarter."
SIP also wins behaviourally. Nobody flinches at ₹10,000/month. ₹12L in one click — most people freeze, wait six months, miss the move.
Common mistakes
- Waiting for a "dip." That's market timing wearing a sensible coat.
- Parking lumpsum in a savings account for years. 3% drag while you decide costs more than a 10% drawdown would.
- Big lumps in bull runs, stopping SIPs in dips. The exact inverse of what works.
- Mixing the two without a plan. A lumpsum staggered over 6–12 months (STP) is fine — over 5 years is just cash drag.
Updated May 26, 2026. Illustrative returns at 12% p.a. — actual mutual fund returns vary. Investments are subject to market risk; read scheme documents carefully.