What is a SIP and how does it differ from a lump-sum investment?

A Systematic Investment Plan (SIP) means investing a fixed amount at regular intervals (usually monthly) into a mutual fund, regardless of market conditions. A lump-sum investment is a one-time large amount. SIPs benefit from rupee-cost averaging — you buy more units when prices are low and fewer when prices are high — reducing the risk of investing at a market peak.

What return rate should I use for my SIP calculation?

For equity mutual funds in India, a long-term expected return of 10–12% per annum is commonly used as a conservative estimate, based on historical NIFTY 50 returns. For debt funds, 6–7% is more appropriate. For international equity funds, 8–10% is reasonable. These are estimates — actual returns depend on fund performance, market conditions, and the time period.

What is a step-up SIP and why does it matter?

A step-up SIP increases your monthly contribution by a fixed percentage each year, mirroring typical salary growth. For example, starting at ₹10,000/month and stepping up 10% annually means contributing ₹11,000 in year 2, ₹12,100 in year 3, and so on. Over a 20-year horizon, a step-up SIP can build a corpus 60–80% larger than a flat SIP at the same initial amount.

SIP Calculator — Regular Investment Projection

Project the value of regular monthly investments at an assumed rate of return.

SIP Calculator

Monthly Investment

Expected Annual Return (%)

Investment Duration (years)

Annual Step-Up (%)

Maturity Value

11,61,695

Total Invested

6,00,000

Wealth Gained

5,61,695

93.6% return on invested

Corpus Breakdown

Invested 6,00,000 Gains 5,61,695

Year

Invested

Gains

Corpus

60,000

4,047

64,047

1,20,000

16,216

1,36,216

1,80,000

37,538

2,17,538

2,40,000

69,174

3,09,174

3,00,000

1,12,432

4,12,432

3,60,000

1,68,785

5,28,785

4,20,000

2,39,895

6,59,895

4,80,000

3,27,633

8,07,633

5,40,000

4,34,108

9,74,108

6,00,000

5,61,695

11,61,695

Future value of a regular investment

Each contribution compounds for a different length of time — the first for the whole term, the last for one month. This sums that series.

FV = PMT × [((1 + r)ⁿ − 1) ÷ r] × (1 + r)

FV: Future value
PMT: Monthly investment
r: Monthly return = annual ÷ 12
n: Number of monthly instalments

Worked example

Monthly investment: 10,000
Expected return: 12% annually → r = 0.01
Term: 15 years → n = 180
Total invested: 1,800,000

≈ 5,050,000 — roughly 2.8× the amount invested

The final × (1 + r) assumes each contribution is made at the start of the period. Contributing at the end instead reduces the result by one month of growth — a small difference that compounds noticeably over long terms.

The assumed return does most of the work, and it is a guess

Projections like this are extremely sensitive to the rate you assume, and that rate is not knowable in advance. On the example above: 10% gives roughly 4.2 million, 12% gives 5.05 million, 14% gives 6.1 million. A two-point difference in an assumption changes the answer by nearly 50%.

Two further points the smooth curve hides. Real markets do not return a constant rate — they deliver long flat periods and sharp drawdowns, and the order of returns matters, particularly near the end of the term. And these figures are nominal: subtract inflation to get purchasing power, and subtract fund charges, which come directly off the return.

Use a projection to understand the shape of the outcome — that time matters more than timing, that contributions dominate early and growth dominates later. Do not treat the final number as a plan. This is arithmetic, not advice; for decisions of consequence, consult a regulated adviser.

About

The SIP Calculator helps you estimate the maturity value of a Systematic Investment Plan over any investment horizon. It uses the standard future value of annuity formula to compute the corpus you will accumulate by investing a fixed amount every month at a given expected annual return. The optional step-up feature lets you model annual increases in your SIP amount, reflecting salary hikes and growing investment capacity. All calculations run entirely in your browser — no data is sent anywhere.

How to use

1 Enter your monthly SIP amount (the fixed sum you invest every month).
2 Set the expected annual return rate — equity mutual funds historically average 10–14%.
3 Choose the investment duration in years.
4 Optionally enable the annual step-up percentage to model increasing contributions.
5 Results show total invested, estimated returns, and final maturity value instantly.

What is a SIP and how does it differ from a lump-sum investment?: A Systematic Investment Plan (SIP) means investing a fixed amount at regular intervals (usually monthly) into a mutual fund, regardless of market conditions. A lump-sum investment is a one-time large amount. SIPs benefit from rupee-cost averaging — you buy more units when prices are low and fewer when prices are high — reducing the risk of investing at a market peak.
What return rate should I use for my SIP calculation?: For equity mutual funds in India, a long-term expected return of 10–12% per annum is commonly used as a conservative estimate, based on historical NIFTY 50 returns. For debt funds, 6–7% is more appropriate. For international equity funds, 8–10% is reasonable. These are estimates — actual returns depend on fund performance, market conditions, and the time period.
What is a step-up SIP and why does it matter?: A step-up SIP increases your monthly contribution by a fixed percentage each year, mirroring typical salary growth. For example, starting at ₹10,000/month and stepping up 10% annually means contributing ₹11,000 in year 2, ₹12,100 in year 3, and so on. Over a 20-year horizon, a step-up SIP can build a corpus 60–80% larger than a flat SIP at the same initial amount.

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