AI-generated conceptual illustration
Would you rather invest ₹6 lakh today or ₹6,000 every month? A calculator can give a neat answer for ten years from now. But the question hides two different situations: one investor already has a large amount, while another can invest from income as it arrives. Looking only at the ending balance can turn that difference into a misleading verdict.
The short version
- A SIP is a method of investing, not a separate product with guaranteed returns.
- Write down total contributions, contribution dates and the same comparison end date.
- A hypothetical result explains mathematics. It does not establish which method will win in a real market.
Start with the money contributed
A ₹6,000 monthly SIP for 120 months contributes ₹7.20 lakh. That is ₹1.20 lakh more than a ₹6 lakh lump sum. However, the entire lump sum is invested from day one. The final SIP contribution receives almost no time in the investment before the comparison ends.
If you want equal total contributions over ten years, compare ₹6 lakh upfront with ₹5,000 a month. Even then, the timing remains different. Equal totals are useful for answering one question; they do not make the cash flows identical. A comparison should explain that distinction rather than quietly presenting a universal winner.
A transparent hypothetical example
Assume a 10% effective annual return, translated into an identical monthly rate throughout the period. The monthly rate is (1.10)1/12 − 1, approximately 0.7974%. Every SIP payment is made at month-end. This is a mathematical assumption, not the historical return or forecast of any fund.
| Method | Contributed | Ending value |
|---|---|---|
| ₹6 lakh upfront | ₹6,00,000 | ₹15,56,245 |
| ₹6,000 monthly | ₹7,20,000 | ₹11,99,183 |
| ₹5,000 monthly | ₹6,00,000 | ₹9,99,319 |
The lump sum benefits from having the full amount invested for longer under this assumption. The table does not prove it wins over every actual ten-year period. It excludes tax, exit loads, transaction levies and any return on money waiting outside the investment. A constant return also removes the difficult experience of negative months.
Already have the full amount? Ask a different question
Suppose ₹6 lakh is already in your bank account and you are considering investing it gradually. This is a deployment decision, not the same as investing new salary each month. Where will the uninvested balance sit? Over how many months will you deploy it? Will you change the plan if markets move sharply?
A fair comparison must include both the invested portfolio and the remaining cash. Ignoring the latter understates your total assets. Ignoring its opportunity cost can overstate the attractiveness of waiting. Neither issue appears when a simple calculator treats future contributions as newly earned money.
At ₹6,000 per instalment, deploying ₹6 lakh takes 100 instalments if interest and additional contributions are ignored. That is approximately eight years and four months. It is a very different proposal from spreading a windfall over a few months.
What does a SIP do to risk?
A fixed contribution buys more units at a lower NAV and fewer at a higher NAV. AMFI explicitly notes that rupee-cost averaging neither assures profit nor protects against losses in falling markets. It can support regular investing; it is not insurance. Source: AMFI SIP education.
Gradual deployment can change how much of your capital experiences an early market move. It cannot remove the underlying fund’s risk once money is invested. Splitting a near-term expense into equity SIP instalments does not make that expense safe. SEBI’s investor guidance identifies goals, time horizon, risk appetite and liquidity as important investment considerations. Source: SEBI Investor.
A five-point comparison checklist
- Is the money available now, or will it come from future income?
- What is the total contribution under each option, and what is the common end date?
- Are instalments assumed at the beginning or the end of the month?
- Does the comparison include waiting cash, costs and any withdrawals?
- What happens to the goal and your behaviour under lower returns or an early decline?
Save these assumptions alongside the result. If a second calculator produces a different answer, compare its conventions before concluding that either calculation is wrong.
Frequently asked questions
Does a SIP protect my principal?
No. The underlying investment determines the risk. A SIP label does not turn a market-linked investment into a capital guarantee.
Must I identify the market bottom before investing a lump sum?
A plan should not depend on reliably recognising that point in advance. Start with the purpose of the money, the time available and an appropriate asset allocation.
Would a beginning-of-month SIP give a different number?
Yes. Each instalment would receive one additional month of assumed growth in this model. Payment timing is one reason calculators can disagree.
Takeaway
Define the cash-flow question before choosing a calculator. A larger ending number is meaningful only when the contribution amounts, dates and assumptions are visible.
Educational information, not personalised investment advice. All calculations are hypothetical. Sources checked on 28 October 2026. Review scheme documents, risks and your own objectives before investing.
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