A Systematic Investment Plan lets you build wealth with as little as ₹500 a month – but how much will your SIP actually be worth in 10, 20 or 25 years? This guide explains how SIP returns are calculated, gives the SIP calculation formula with worked examples, shows how a step-up SIP can double your final corpus, and explains XIRR, the right way to measure SIP returns.
What Is a SIP?
A SIP (Systematic Investment Plan) is a way of investing a fixed amount in a mutual fund at regular intervals – usually every month – through an automatic bank debit. Each instalment buys units at that day's price (NAV). Over time you build a large number of units without having to time the market.
SIP Calculation Formula
SIP calculators use the future value of a series of monthly investments made at the start of each month:
FV = P × [(1 + i)n − 1] ÷ i × (1 + i)
- FV = future value (maturity amount)
- P = monthly SIP amount
- i = expected monthly return = annual return ÷ 12 ÷ 100
- n = number of monthly instalments
The last factor, (1 + i), is there because each instalment is invested at the beginning of the month and earns a full month's return.
Worked Example: ₹10,000 SIP for 20 Years
Invest ₹10,000 a month for 20 years with an expected return of 12% a year:
- i = 12 ÷ 12 ÷ 100 = 0.01
- n = 20 × 12 = 240
- (1.01)240 ≈ 10.893
- FV = 10,000 × (10.893 − 1) ÷ 0.01 × 1.01 ≈ ₹99,91,479
You invest ₹24 lakh and end up with about ₹1 crore. Roughly ₹76 lakh – three-quarters of the final value – comes from returns, not from your own money. That is the power of compounding over a long period.
SIP Returns Table at 12%
| Monthly SIP | Period | Total invested | Estimated value at 12% |
|---|---|---|---|
| ₹5,000 | 10 years | ₹6,00,000 | ₹11,61,695 |
| ₹5,000 | 20 years | ₹12,00,000 | ₹49,95,740 |
| ₹10,000 | 10 years | ₹12,00,000 | ₹23,23,391 |
| ₹10,000 | 15 years | ₹18,00,000 | ₹50,45,760 |
| ₹10,000 | 20 years | ₹24,00,000 | ₹99,91,479 |
| ₹10,000 | 25 years | ₹30,00,000 | ₹1,89,76,351 |
Notice how the value nearly doubles between 20 and 25 years for the same ₹10,000 a month. The final years of a long SIP add the most money.
How Much SIP for ₹1 Crore?
At an expected 12% a year, the monthly SIP needed to reach ₹1 crore is about:
- ₹19,819 a month for 15 years
- ₹10,009 a month for 20 years
- ₹5,270 a month for 25 years
Starting five years earlier cuts the required monthly amount roughly in half. Time is the biggest lever in any SIP.
Step-Up SIP: The Easiest Way to Grow Faster
A step-up SIP (also called a top-up SIP) increases your monthly amount by a fixed percentage every year, usually in line with your salary hikes. Compare a flat and a stepped-up SIP starting at ₹10,000 a month for 20 years at 12%:
| SIP type | Total invested | Estimated value |
|---|---|---|
| Flat ₹10,000 a month | ₹24,00,000 | ₹99,91,479 |
| ₹10,000 stepped up 10% every year | ₹68,73,000 | ₹1,98,88,715 |
The step-up SIP roughly doubles the final corpus to about ₹1.99 crore. Most mutual fund platforms let you set an automatic yearly step-up.
SIP Returns and XIRR
Because each SIP instalment is invested on a different date, a simple percentage gain does not tell you your true annual return. Mutual fund statements therefore show XIRR (extended internal rate of return), which accounts for the timing of every instalment. In Excel you can calculate it with =XIRR(values, dates), entering each SIP as a negative amount and the current value as a positive amount on today's date. When you compare funds, compare their XIRR, not their absolute returns.
What Return Should You Expect?
SIP calculators need an expected return, but real returns vary every year. As a rough guide for long periods (10+ years):
- Large-cap and index funds: historically about 10%–12% a year.
- Flexi-cap and mid-cap funds: potentially higher, with bigger ups and downs.
- Hybrid funds: roughly 8%–10%, with lower volatility.
- Debt funds: roughly 6%–7.5%, closer to FD returns.
Past returns do not guarantee future results. It is sensible to plan with a conservative figure such as 10% for equity and treat anything above it as a bonus.
Rupee Cost Averaging
When markets fall, your fixed SIP amount buys more units; when they rise, it buys fewer. Over time this rupee cost averaging lowers your average cost per unit compared with buying at random times, and removes the stress of trying to time the market. The key is to keep investing during downturns – stopping a SIP in a falling market means missing the cheapest units.
Tax on SIP Returns
Each SIP instalment is treated as a separate investment for tax. For equity funds, units held more than 12 months qualify for long-term capital gains tax of 12.5% on gains above ₹1.25 lakh a year; units held less than 12 months are taxed at 20%. ELSS funds offer the ₹1.5 lakh deduction under the old tax regime, with a 3-year lock-in for each instalment. Compare SIPs with fixed deposits in our SIP vs FD guide.
SIP vs Lump Sum: Which Gives Higher Returns?
If you already have a large amount, investing it all at once (a lump sum) gives the money more time in the market. ₹24 lakh invested on day one and left for 20 years at 12% could grow to about ₹2.3 crore, compared with about ₹1 crore from ₹10,000 a month over the same period – but that comparison is unfair, because most people do not have ₹24 lakh on day one. A SIP matches investing to your monthly income. For a windfall such as a bonus or inheritance, many investors use a middle path called a systematic transfer plan (STP): they park the money in a liquid fund and move a fixed amount into an equity fund every month for 6 to 12 months, which spreads out the risk of investing just before a market fall.
How to Start a SIP: Step by Step
- Complete your KYC once with your PAN, Aadhaar and bank details – most apps do this online in minutes.
- Choose a fund that matches your goal and time horizon – for example, an index or flexi-cap fund for goals more than 7 years away.
- Pick the amount and date, ideally a few days after your salary is credited.
- Set up the auto-debit mandate with your bank so every instalment is paid automatically.
- Add a nominee and, if available, an annual step-up.
SIP Mistakes to Avoid
- Stopping during a market crash – that is exactly when your SIP buys the most units.
- Chasing last year's top fund – performance rankings change often.
- Too many funds – three or four well-chosen funds are usually enough.
- Using an unrealistic return in the calculator and then under-saving.
SIP Tips for Beginners
- Start early, even with a small amount – ₹1,000 a month started at 25 can beat ₹3,000 started at 40.
- Link each SIP to a goal – retirement, a child's education, a home down payment.
- Step up every year with your salary increase.
- Stay invested through market falls.
- Review once a year, not every day.
- Choose direct plans for lower expense ratios if you are comfortable picking funds yourself.
Frequently Asked Questions
How is SIP return calculated?
SIP calculators use FV = P × [(1 + i)^n − 1] ÷ i × (1 + i), where P is the monthly amount, i the monthly return and n the number of months. Actual fund returns are measured with XIRR.
What will ₹10,000 SIP for 20 years become?
At an assumed 12% a year, about ₹99.9 lakh from ₹24 lakh invested. At 10%, about ₹76.6 lakh.
How much SIP is needed for ₹1 crore?
About ₹10,000 a month for 20 years at 12%, ₹19,800 for 15 years, or ₹5,300 for 25 years.
What is a step-up SIP?
A SIP whose monthly amount increases by a fixed percentage every year. A ₹10,000 SIP stepped up by 10% a year for 20 years could grow to about ₹1.99 crore at 12%.
What is XIRR in SIP?
XIRR is the annualised return that accounts for the different dates of each SIP instalment. It is the correct way to measure SIP performance.
Are SIP returns guaranteed?
No. SIP returns depend on market performance and can be negative in the short term. Calculators show estimates based on an assumed return.
Can I stop or pause a SIP?
Yes. You can pause or cancel a SIP at any time through your fund platform without penalty, except in ELSS funds where each instalment has a 3-year lock-in before it can be redeemed.
What is the minimum amount for a SIP?
Many mutual funds allow SIPs from ₹100 or ₹500 a month. Starting small and stepping up later is better than waiting until you can invest a large amount.
Disclaimer: Calculations assume a constant return for illustration. Mutual fund investments are subject to market risks; read all scheme-related documents carefully. Past performance is not indicative of future returns. This article is general information, not investment advice.