Lumpsum vs SIP Calculator
You have ₹10 lakh. Invest it all now, or stagger it as ₹83k/month over 12 months? The answer depends on the market — but the math is clear.
About this tool
A direct comparison calculator for the most-asked investing question in India: should I invest this lumpsum now, or stagger it via STP / SIP? Run both scenarios on the same money, the same horizon, the same fund — and see the corpus gap, the rupee-cost-averaging benefit, and the cost of being wrong in either direction.
How to use it
Quick steps to get the most out of this utility.
- 1
Enter the total amount
The money you have to invest — bonus, inheritance, FD maturity, business windfall.
- 2
Set the comparison horizon
Use the same end-date for both. The lumpsum compounds for the full period; the SIP deploys over months 1–N and compounds the rest.
- 3
Choose expected return
Use a realistic long-run rate (10–12% for equity). The relative gap between lumpsum and SIP barely changes with the return rate.
- 4
Pick SIP duration
6–12 months is the common staggering window. Longer reduces volatility risk but also reduces lumpsum advantage.
- 5
Read the verdict
See both final corpuses and the percentage gap. Decide whether the risk reduction is worth the expected return giveup.
The math behind the lumpsum advantage
Imagine you have ₹12 lakh. Option A: invest the whole thing on day 1 in an equity fund averaging 12% / year. Option B: invest ₹1 lakh per month for 12 months, then leave it. After year 1, both portfolios have invested the same ₹12 lakh — but Option A has earned 12% on the full amount while Option B has earned only ~6.5% on the average balance. From year 2 onwards both compound at the same rate on different base capital. That gap, set at year 1, compounds for the entire horizon.
When the math reverses
The lumpsum advantage assumes a generally rising market. In a falling market — say, a 25% drawdown over 12 months — the SIP buys progressively cheaper units while the lumpsum sits at peak entry. When markets recover, the SIP's lower average cost beats the lumpsum's timing disadvantage, sometimes by 15–20%. This is exactly why staggering wins in crash years and loses in rally years.
A simple decision framework
- Is the lumpsum more than 30% of your total investable assets? If yes, stagger.
- Are major indices within 5% of all-time highs? If yes, stagger 6–12 months.
- Is your horizon under 5 years? If yes, the SIP/lumpsum gap matters less than asset allocation — be more conservative overall.
- Are you emotionally tested in markets? If no, stagger — the math is worth a tiny giveup for the chance to actually stay invested.
Frequently asked questions
Does lumpsum or SIP give a higher return?+
On average, lumpsum wins. Roughly 65–70% of historical rolling windows show lumpsum beating staggered SIP because more money is in the market for longer. But the wins-and-losses are not symmetric — when SIP wins, it wins big (during market falls), and when lumpsum wins, the margin is usually small. The right framing is risk-adjusted: lumpsum has higher expected return and higher variance.
When should I prefer SIP over lumpsum?+
Three situations make staggered deployment clearly better: (1) markets at all-time highs with stretched valuations, (2) you would emotionally regret a 20% drawdown in month 1, (3) the lumpsum is large enough that a single bad entry could permanently impact retirement plans. In any of these, give up 1–2% of expected return for the peace of mind of a 6–12 month STP.
Is STP the same as SIP for this comparison?+
Functionally yes. STP (Systematic Transfer Plan) parks the lumpsum in a liquid fund and transfers a fixed amount to an equity fund monthly. SIP just invests fresh money monthly. For comparing "lumpsum now" vs "staggered deployment", both behave identically — the only difference is that STP earns liquid-fund returns (~6%) on the uninvested portion, while SIP money sits in your bank earning savings rate (~3%).
How long should I stagger a lumpsum?+
A working rule: stagger over 6 months if markets are near average valuations, 12 months if valuations are elevated, immediate lumpsum if markets have fallen 15%+ from recent peaks. The point is to balance two opposing risks — being wrong about a near-term crash, and being out of the market while it rallies. 6–12 months covers most reasonable timelines.
What about dollar-cost averaging in retirement accounts?+
Same math. If you receive a one-time bonus and want to put it in your 401k / NPS / EPF voluntary contribution, lumpsum-vs-staggered is the same question. Most retirement accounts allow only periodic contributions anyway, which effectively forces a SIP-like deployment — but if you have flexibility, the long-horizon argument for lumpsum applies even more strongly because the compounding window is 20–30 years.
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