Key points
- A SIP invests a fixed amount in a mutual fund at regular intervals, usually monthly.
- At 12% a year, ₹10,000 a month grows to about ₹23 lakh in 10 years and ₹1 crore in 20 years.
- Time in the market matters more than the amount: the last 10 years of a 30-year SIP add over ₹2.5 crore.
- SIP returns are market-linked and not guaranteed; use a conservative rate when planning.
SIP in one paragraph
A systematic investment plan (SIP) is an instruction to your mutual fund to take a fixed amount from your bank account on a fixed date — every month, for most people — and buy units of a fund at that day’s price (NAV). It is not a product in itself; it is a way of investing in any mutual fund, from equity and index funds to debt and hybrid funds.
Because the amount is fixed and the unit price changes, you automatically buy more units when prices are low and fewer when they are high. Over time this smooths out the price you pay and removes the need to guess the right moment to invest.
How SIP returns are calculated
Each instalment grows for the months remaining until you stop. A calculator assumes a steady annual return, converts it to a monthly rate (r = annual rate ÷ 12) and adds up the growth of every instalment: FV = P × [((1 + r)ⁿ − 1) ÷ r] × (1 + r), where P is the monthly amount and n the number of months. The last (1 + r) reflects that each instalment is invested at the start of the month.
Real returns do not arrive smoothly — some years are up 30%, others down 20% — so the actual value on any date will differ. The formula tells you what a steady average would produce.
What ₹10,000 a month can grow to
| Period | Amount invested | Estimated value | Estimated gain |
|---|---|---|---|
| 5 years | ₹6,00,000 | ₹8,24,864 | ₹2,24,864 |
| 10 years | ₹12,00,000 | ₹23,23,391 | ₹11,23,391 |
| 15 years | ₹18,00,000 | ₹50,45,760 | ₹32,45,760 |
| 20 years | ₹24,00,000 | ₹99,91,479 | ₹75,91,479 |
| 25 years | ₹30,00,000 | ₹1,89,76,351 | ₹1,59,76,351 |
| 30 years | ₹36,00,000 | ₹3,52,99,138 | ₹3,16,99,138 |
The gains accelerate: in the first 10 years your money roughly doubles, but between years 20 and 30 the portfolio grows by more than ₹2.5 crore — almost all of it from returns on returns. Starting early is worth more than investing a larger amount later.
How the assumed return changes the outcome
| Assumed return | Estimated value |
|---|---|
| 8% | ₹18,41,657 |
| 10% | ₹20,65,520 |
| 12% | ₹23,23,391 |
| 14% | ₹26,20,914 |
Plan with a conservative figure. Large-cap equity funds in India have historically delivered roughly 10%–13% a year over long periods, with wide variation; debt funds lower, closer to deposit rates. A plan that works at 10% will not fall apart if returns disappoint.
Step-up SIPs: grow the SIP with your salary
A step-up (or top-up) SIP raises the monthly amount by a fixed percentage every year. Starting at ₹10,000 and stepping up 10% a year for 20 years means investing about ₹68.7 lakh in total; at 12% it could grow to about ₹1.99 crore — roughly twice the ₹1 crore from a flat ₹10,000 SIP. The mutual fund calculator has a step-up option.
Common SIP mistakes
- Stopping the SIP when markets fall — that is exactly when each instalment buys the most units.
- Judging a fund on one or two years of returns; equity SIPs need at least five to seven years.
- Using SIPs for short-term goals; money needed within three years belongs in deposits or debt funds.
- Holding too many funds. Three or four well-chosen funds diversify as well as fifteen.
- Ignoring the expense ratio. A direct plan with a lower expense ratio leaves more of the return with you.
How SIP gains are taxed
Each SIP instalment is treated as a separate purchase with its own holding period. For equity funds, units held over 12 months are long-term: gains above ₹1.25 lakh a year are taxed at 12.5%. Units sold within 12 months are short-term and taxed at 20%. Gains on debt funds bought after 1 April 2023 are taxed at your slab rate regardless of holding period. The capital gains calculator works out the tax on a sale.
Frequently asked questions
What is the minimum amount for a SIP?
Many funds accept SIPs from ₹500 a month, and some from ₹100. The minimum varies by fund house and scheme.
Can I stop or pause a SIP?
Yes. Open-ended fund SIPs can be stopped or paused at any time without a penalty; the units already bought stay invested. Exit loads may apply if you redeem units within a short period, often one year for equity funds.
Is SIP better than lumpsum?
Neither is always better. A lumpsum invested early earns more if markets rise steadily; a SIP reduces the risk of investing everything at a peak. For a regular salary, SIP is the natural fit. See our SIP vs lumpsum guide.