Lump Sum vs SIP: Which Is Better When You Have Cash?
Investing all at once usually grows more — if markets cooperate. SIP spreads your risk. Here is how to choose, with numbers.
You have ₹12 lakh to invest — from a bonus, the sale of a property or maturity proceeds. Should you invest it all at once, or spread it out through a SIP? The answer depends on time, risk and temperament more than on a formula, but the numbers help frame the decision.
Key takeaways
- If returns are steady, a lump sum grows more because all the money is invested for the full period.
- ₹12 lakh invested at once at 12% for 10 years reaches about ₹37.3 lakh; ₹10,000 a month for 10 years reaches about ₹23.2 lakh.
- Spreading a lump sum over 6–12 months (a systematic transfer plan) reduces the risk of investing just before a fall.
Why a lump sum usually grows more
Compare investing ₹12 lakh today with investing ₹10,000 a month for 10 years (₹12 lakh in total), both at 12% a year:
| Lump sum ₹12 lakh | SIP ₹10,000 a month | |
|---|---|---|
| Total invested | ₹12,00,000 | ₹12,00,000 |
| Value after 10 years at 12% | ₹37,27,018 | ₹23,23,391 |
| Value after 10 years at 8% | ₹25,90,710 | ₹18,41,657 |
The lump sum wins because every rupee is invested for the full 10 years, while SIP instalments are invested gradually. But this comparison assumes a smooth return every year — which markets never deliver.
The risk the table hides: timing
If you invest a lump sum just before a market fall of 25–30%, your portfolio can take years to recover. A SIP buys at many different prices, including the lows, which smooths your average cost (rupee cost averaging). You give up some expected return in exchange for less timing risk — and for many people, less regret.
Which suits your situation?
A lump sum may suit you if
- Your horizon is long (10 years or more), so a bad entry point has time to recover.
- You can stay invested calmly through a sharp fall.
- The money is going into lower-volatility assets such as debt funds or deposits.
A SIP may suit you if
- You are investing from monthly income — then it is the natural choice anyway.
- You would be tempted to sell if your investment fell sharply soon after investing.
- Markets have risen strongly and valuations make you uneasy.
The middle path: a systematic transfer plan
With a Systematic Transfer Plan (STP), you put the lump sum in a low-risk liquid or debt fund and transfer a fixed amount into an equity fund every month, typically over 6 to 12 months. Most of your money earns a modest return while it waits, and you avoid committing everything at a single market level.
Before investing any lump sum, make sure your emergency fund is full and high-interest debts are cleared. Paying off a 14% personal loan is a guaranteed 14% return that no investment can promise.
Compare for yourself
Use the Compound Interest Calculator for the lump sum and the SIP Calculator for monthly investing, with the same rate and time period. Try a cautious return as well as an optimistic one to see the range. Returns shown are illustrative; market-linked investments are not guaranteed.
This article is for general information only and is not financial, tax or legal advice. Rates, rules and products change — check current terms with your lender or a qualified adviser. Disclaimer.