SIP vs Lump Sum: What ₹5 Lakh Becomes in 10 Years
You've got ₹5 lakh. Do you put it all in today, or drip it in over ten years? Almost everyone has a strong opinion, and the honest answer is that both are right depending on what the market does next, which nobody knows. What you can know is exactly how much each approach wins or loses by in different situations. That's what this post shows.
If you only read one bit
- With steady 12% returns, putting ₹5 lakh in at once ends at ₹15,52,924. Spreading the same ₹5 lakh over 10 years gives ₹9,33,483.
- The lump sum wins in most normal scenarios, because every rupee starts growing on day one.
- Even a 30% fall in year 1 doesn't change that if markets then recover at 12% a year: the lump sum ends at ₹9,70,578 and the SIP at ₹9,00,870.
- The SIP only pulls ahead if a crash is followed by weak returns, below roughly 9.5% a year for the next nine years.
- So a SIP doesn't earn more. It's insurance against a bad start that never fully recovers.
What I compared
To keep it fair, both approaches use the same total: ₹5,00,000. With the lump sum, all of it goes in on day one. With the SIP, I split it into 120 equal monthly instalments of about ₹4,167 over ten years, and the money you haven't invested yet just waits (earning nothing, to keep things simple). Returns are the same in both cases, so the only thing that differs is timing.
When returns are steady
If the market gives the same return every year, the lump sum wins every time. Here's the gap at four different return levels:
| Yearly return | Lump sum after 10 years | SIP after 10 years | Lump sum ahead by |
|---|---|---|---|
| 8% a year | ₹10,79,462 | ₹7,55,347 | ₹3,24,116 |
| 10% a year | ₹12,96,871 | ₹8,39,407 | ₹4,57,465 |
| 12% a year | ₹15,52,924 | ₹9,33,483 | ₹6,19,441 |
| 14% a year | ₹18,53,611 | ₹10,38,718 | ₹8,14,893 |
The logic is plain. In the lump sum, ₹5 lakh grows for ten full years. In the SIP, only the first instalment grows for ten years. The last grows for one month. On average, SIP money is invested for about half the time, so it earns about half as much growth. That's not a flaw in SIPs, it's just what spreading money out means.
When markets don't cooperate
Real markets aren't steady. So I tried four situations. In each, the first year is different from the rest:
| Scenario | Lump sum | SIP | Winner |
|---|---|---|---|
| Steady 12% every year | ₹15,52,924 | ₹9,33,483 | Lump sum |
| Markets fall 30% in year 1, then 12% a year | ₹9,70,578 | ₹9,00,870 | Lump sum |
| Markets fall 30% in year 1, then only 8% a year | ₹6,99,652 | ₹7,33,941 | SIP |
| Markets rise 30% in year 1, then 12% a year | ₹18,02,501 | ₹9,46,256 | Lump sum |
This surprised me a little. A 30% fall right after investing sounds like the nightmare case for a lump sum, but if the market then recovers at a normal 12% a year, the lump sum is still ahead after ten years. The gap shrinks from about ₹6.2 lakh to about ₹0.7 lakh, but it doesn't flip. The SIP only wins in the third row, where the crash is followed by a weak recovery. For a ten-year horizon, the break-even is roughly 9.5% a year for the years after the fall. Below that, the SIP's cheap purchases during the weak stretch matter more than the lump sum's head start.
So the real trade-off is between a rare bad case and the usual good one. Neither result is skill. It's timing, and no one can reliably predict it.
What I'd actually do
If the money is already in your account and you've got ten years or more, historically investing it all at once has done better more often than not. But "more often than not" isn't "always", and a big early loss can be hard to sit through. Plenty of people panic and sell after a fall, which is the worst outcome of all. If that sounds like you, spreading it out is a perfectly good price to pay for sleeping well.
There's a middle option too. Put the money in a safe, liquid fund and move a fixed amount into your chosen fund every month for six to twelve months. That keeps most of the growth advantage while softening the timing risk. It's often called an STP, a systematic transfer plan.
One thing people mix up
SIP versus lump sum isn't really a choice for most of us. If your money arrives as a monthly salary, a SIP is simply how you invest it, since you don't have the lump sum yet. The question only comes up when you have a big amount sitting there, like a bonus, a maturity payout or a sale. Then the answer depends on how you'd feel in a bad year, not only on the maths.
Test it with your own numbers
Lump sum vs SIP
Enter the amount, the time, and the returns. You can set the first year differently to see what a crash or a boom does to each approach.
Questions people ask
Does a SIP earn a higher return than a lump sum?
No. The return on the money is the same. A SIP just has less money invested for less time, so its total is usually lower in rising markets and holds up better only when a fall is followed by weak returns.
Is it bad to invest a lump sum at a market high?
Nobody can reliably spot highs in advance. Over long periods, waiting for the perfect moment has usually cost more than investing at an imperfect one. But if a fall would make you sell, spreading the money makes sense.
How long should a lump sum be spread out?
Six to twelve months is a common compromise. Spreading it over several years gives up a lot of growth for a small reduction in risk.
Can I do both?
Yes. A lump sum from a bonus plus an ongoing monthly SIP from your salary is the most common real-world combination.
This article is for general information and education. It is not financial, tax or legal advice. Examples use illustrative round numbers and standard formulas. Your lender's actual rates, fees and rules will differ, so check your loan agreement or speak to a qualified adviser before making borrowing or investment decisions.
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