A SIP is one of the most popular ways Indians invest in mutual funds. It's simple, automatic, and works well over long periods. This guide explains what a SIP is, how its returns are worked out, and how a small yearly increase can make a big difference.
Please note: This article is for general information only and is not investment advice. Mutual fund returns are market-linked and never guaranteed. Always read the scheme documents or talk to a qualified advisor before investing.
What is a SIP?
SIP stands for Systematic Investment Plan. Instead of investing a large amount at once, you invest a fixed sum — say ₹5,000 — into a mutual fund every month. It's the same idea as a recurring deposit, except the money goes into a market-linked fund rather than a fixed-return account.
Two things make SIPs powerful over time:
- Compounding — your returns start earning their own returns.
- Rupee-cost averaging — because you invest every month, you buy more units when prices are low and fewer when they're high, which smooths out market ups and downs.
How are SIP returns calculated?
Each monthly instalment stays invested for a different length of time — your first instalment grows for the whole period, while your last one grows for just a month. A SIP calculator adds up the future value of every instalment.
The standard formula for the future value of a SIP is:
FV = P × [ ((1 + i)^n − 1) / i ] × (1 + i)
Where:
- P is your monthly investment
- i is the monthly return (annual return ÷ 12 ÷ 100)
- n is the number of monthly instalments (years × 12)
You don't need to do this by hand — our free SIP Calculator does it instantly — but it helps to see why longer periods matter so much.
A worked example
Suppose you invest ₹5,000 per month for 10 years, assuming a 12% annual return:
- Total invested = ₹5,000 × 120 months = ₹6,00,000
- Estimated future value ≈ ₹11.6 lakh
- Estimated returns ≈ ₹5.6 lakh
So more than you invested comes from returns — that's compounding at work over a decade. Stretch it to 15 or 20 years and the gap grows even wider.
SIP vs lumpsum
A lumpsum is a one-time investment. If you already have a large amount ready, a lumpsum can grow more (it's invested for the full period), but it's also more exposed to bad timing. A SIP spreads your entry across many months, which reduces timing risk and suits people investing from their monthly income. Many investors do both. You can compare the two in the calculator by switching between "Monthly SIP" and "One-time (Lumpsum)".
What is a step-up SIP?
A step-up (or top-up) SIP increases your monthly amount by a set percentage every year — for example 10% — usually to match your rising salary. Because the extra amount also compounds, even a modest step-up can add a surprising amount to your final corpus. Try it in the calculator to see the difference for your own numbers.
A realistic word on returns
The "expected return" is an assumption, not a promise. Equity funds have historically delivered strong long-term returns, but any year can be negative, and the future can look different from the past. Use a sensible, slightly conservative assumption, invest for the long term, and don't rely on a single number.
Try it with your own figures
Enter your monthly amount, expected return and time period into the free SIP Calculator to see your estimated future value, how much you've invested, and your estimated returns — with an optional step-up to model a yearly increase.