What is a SIP (Systematic Investment Plan)?
A Systematic Investment Plan (SIP) lets you invest a fixed amount in a mutual fund at regular intervals, usually every month, instead of investing a big sum at once. You can start with as little as ₹100 to ₹500 a month. Every instalment buys fund units at that day’s price, so you buy more units when markets are low and fewer when they are high. This is called rupee cost averaging.
Our SIP calculator estimates how much your monthly investment can grow to over 1 to 40 years at the return rate you expect. It shows the amount you invest, the estimated returns and the total maturity value, with a year-wise chart.
SIP Calculator Formula Explained
The future value of a monthly SIP is calculated with the formula for an annuity due, because each instalment is invested at the start of the month:
M = maturity value · P = monthly SIP amount
i = monthly rate = annual rate ÷ 12 ÷ 100 · n = number of months
Example: ₹10,000 a month for 15 years at 12%
Here P = ₹10,000, i = 0.01 and n = 180. Total invested is ₹18,00,000. The estimated maturity value is about ₹50.46 lakh, so estimated returns are about ₹32.46 lakh.
Note that the return rate is an assumption. Real mutual fund returns move up and down every year, so the actual XIRR of your SIP will differ from the smooth projection.
SIP Returns Table: How ₹10,000 a Month Grows
| Monthly SIP | Years | Return | Invested | Estimated value |
|---|---|---|---|---|
| ₹5,000 | 10 | 12% | ₹6,00,000 | ₹11,61,695 |
| ₹10,000 | 10 | 12% | ₹12,00,000 | ₹23,23,391 |
| ₹10,000 | 15 | 12% | ₹18,00,000 | ₹50,45,760 |
| ₹10,000 | 20 | 10% | ₹24,00,000 | ₹76,56,969 |
| ₹10,000 | 20 | 12% | ₹24,00,000 | ₹99,91,479 |
| ₹10,000 | 20 | 15% | ₹24,00,000 | ₹1,51,59,550 |
| ₹10,000 | 25 | 12% | ₹30,00,000 | ₹1,89,76,351 |
Two things stand out. First, time matters more than amount: moving from 15 to 25 years at the same ₹10,000 a month nearly quadruples the corpus. Second, a small change in the return rate makes a large difference over long periods, which is why you should not stretch your assumptions.
How to Use This SIP Calculator
- Enter the monthly investment amount.
- Set the expected annual return. Long-term equity funds are often assumed at 10% to 12%, hybrid funds around 8% to 10% and debt funds 6% to 8%. Past returns do not guarantee future returns.
- Choose the investment period in years.
- Read the invested amount, estimated returns and total value. Use Preview & Save for an A4 report.
Tip: To plan a goal, work backwards: decide the amount you need, then raise the monthly SIP until the total value matches it. If your income grows every year, try the step-up SIP calculator as well.
SIP vs Lumpsum: Which is Better?
A SIP suits people who earn monthly and want discipline with lower timing risk. A lumpsum suits people who already hold a large amount, for example a bonus or maturity proceeds. Neither is always better: a lumpsum invested just before a long rally wins, and a SIP started before a fall can win. Compare both with our lumpsum calculator.
| SIP | Lumpsum | |
|---|---|---|
| Amount needed | Small, regular | Large, one time |
| Market timing risk | Spread over months | Entire amount at one price |
| Discipline | Automatic | Needs a decision each time |
| Best for | Salaried investors, long-term goals | Windfalls, existing savings |
Tax on SIP Returns
Each SIP instalment is treated as a separate purchase, so the holding period is counted for each instalment. Under the rules currently in force:
- Equity funds: gains on units held for more than 12 months are taxed as long-term capital gains at 12.5% on the amount above ₹1.25 lakh in a financial year. Gains within 12 months are taxed at 20%.
- Debt funds: gains are generally added to your income and taxed at your slab rate.
- ELSS funds have a 3-year lock-in and qualify for a Section 80C deduction (old tax regime).
Tax rules change often, so check the latest rates before you redeem.
Tips to Get More from Your SIP
- Start early and stay invested for at least 7 to 10 years for equity funds.
- Increase your SIP every year, even by 5% to 10%.
- Do not stop your SIP during market falls; that is when you buy more units.
- Match the fund type to the time frame: equity for 7+ years, debt or hybrid for 2 to 5 years.
- Review your portfolio once a year instead of every week.
Using the SIP Calculator for Real Goals
Use the calculator backwards from your goal. Suppose you need ₹1 crore in 15 years. At an assumed 12% return, a SIP of about ₹20,000 a month reaches roughly ₹1 crore (a ₹10,000 SIP reaches ₹50.5 lakh, so double it). At 10% you would need a higher SIP. Try different amounts until the maturity value matches your target.
| Goal | Typical time | Better option |
|---|---|---|
| Emergency fund | Always available | Savings account, liquid fund |
| Vacation, car | 1 to 3 years | FD or RD |
| Child’s education, home | 5 to 15 years | Equity or hybrid SIP |
| Retirement | 15 to 30 years | Equity SIP with EPF, PPF and NPS |
Common SIP Mistakes
- Stopping the SIP when the market falls.
- Choosing a fund only because it gave the highest return last year.
- Using a very high expected return (above 15%) when planning.
- Starting too many SIPs in similar funds instead of a few well-chosen ones.
- Ignoring expenses: a lower expense ratio adds meaningfully to long-term returns.