What is a SIP?
A Systematic Investment Plan (SIP) is a method of investing a fixed amount in a mutual fund at regular intervals — typically monthly. Instead of timing the market with one large investment, you contribute steadily, buying more units when prices are low and fewer when prices are high. This is known as rupee-cost averaging.
SIPs are the most popular way for retail investors in India to build long-term wealth, with monthly SIP inflows crossing ₹26,000 crore as of 2025. Globally, the same concept is called dollar-cost averaging.
What is a Lumpsum investment?
A lumpsum investment is a one-time deposit of a large amount into a mutual fund or other investment vehicle. The entire amount is exposed to market returns from day one, which means it benefits more from compounding when markets rise — but also faces full downside if markets fall right after investing.
Lumpsum is best suited for windfalls (bonuses, inheritances, sale proceeds) or when valuations are reasonable. Many advisors recommend a hybrid approach: invest a lumpsum in a debt or liquid fund, then use a Systematic Transfer Plan (STP) to gradually move it into equity.
The SIP formula explained
The future value of a SIP is calculated using the future value of an annuity due formula:
Where:
- FV = Future Value (the amount you'll have at the end)
- P = Monthly SIP amount
- r = Monthly rate of return (annual rate ÷ 12 ÷ 100)
- n = Number of months (years × 12)
Monthly SIP: ₹10,000 · Annual return: 12% · Tenure: 10 years
r = 12 / 12 / 100 = 0.01 · n = 120
FV = 10,000 × [((1.01)120 − 1) / 0.01] × 1.01 = ₹23,23,391
Total invested: ₹12,00,000 · Wealth gained: ₹11,23,391
The Lumpsum formula
The future value of a lumpsum uses the standard compound interest formula:
Where P is the principal invested, r is the annual rate of return (decimal), and n is the number of years.
Lumpsum: ₹1,00,000 · Annual return: 12% · Tenure: 10 years
FV = 1,00,000 × (1.12)10 = ₹3,10,585
Wealth gained: ₹2,10,585 — over 3× growth in 10 years.
SIP vs Lumpsum: which is better?
There is no universal winner. The right choice depends on your cash flow, risk tolerance, and market conditions. Here's a side-by-side comparison:
| Feature | SIP | Lumpsum |
|---|---|---|
| Best for | Salaried investors with monthly income | Windfalls, bonuses, sale proceeds |
| Market timing risk | Low (averages out) | High (depends on entry point) |
| Compounding benefit | Gradual | Maximum from day one |
| Volatility | Smoothed via rupee-cost averaging | Fully exposed |
| Discipline | Forces consistent investing | Requires lump availability |
| Returns in rising market | Lower than lumpsum | Typically higher |
| Returns in falling/volatile market | Typically higher | Lower (or losses) |
Step-up SIP: the wealth multiplier
A step-up SIP (also called top-up SIP) increases your monthly contribution by a fixed percentage each year — typically 5%, 10%, or 15%. Since salaries rise with experience and inflation, your investments should rise too.
- Flat ₹10,000/month: ~₹99.9 lakh
- 10% step-up starting ₹10,000/month: ~₹1.83 crore
- That's 83% more wealth for a gradually rising commitment
Real returns vs nominal returns
Nominal return is the raw percentage growth of your investment. Real return is what's left after subtracting inflation — it represents true purchasing-power gain.
Example: A 12% nominal return with 6% inflation gives a real return of approximately 5.66%. Always plan retirement and long-term goals in real terms — what ₹1 crore can buy 20 years from now is materially less than today.
Common goal-based SIP targets
Assuming a 12% annual return, here's how much you'd need to invest monthly for popular goals:
| Goal | 10 years | 15 years | 20 years | 25 years |
|---|---|---|---|---|
| ₹50 lakh | ₹21,750 | ₹10,000 | ₹5,000 | ₹2,650 |
| ₹1 crore | ₹43,500 | ₹20,000 | ₹10,000 | ₹5,300 |
| ₹2 crore | ₹87,000 | ₹40,000 | ₹20,000 | ₹10,600 |
| ₹5 crore | ₹2,17,500 | ₹1,00,000 | ₹50,000 | ₹26,500 |
How to use this calculator
- Pick a mode: SIP for monthly investments, Lumpsum for one-time, or Both for combined.
- Choose your currency: Toggle between ₹ (INR) and $ (USD).
- Enter the amount you plan to invest.
- Set the tenure — longer is almost always better for compounding.
- Set expected return: 12% is a reasonable equity-fund baseline; use 8% to be conservative.
- Optional: Add an annual step-up percentage and an inflation rate for a more realistic projection.
- Review the year-by-year table and download the breakdown as CSV.