Step-Up SIP Calculator
Step-Up SIP Calculator
Estimate what a SIP could grow to if you raise the monthly amount by a fixed percentage every year — and compare it with keeping the SIP level. Returns on market-linked funds are not guaranteed.
Step-up SIP
$10,000 a month, raised 10% every year, for 10 years at 12% a year
Future value of a step-up SIP
- P
- the monthly SIP in the first year
- i
- the monthly rate: annual return ÷ 12 ÷ 100
- g
- 1 + the step-up as a decimal; year k’s SIP is P × g to the power k
- A
- what 12 start-of-month instalments of 1 are worth at the end of their year
- q
- one year’s growth at the monthly rate. When q equals g the formula becomes P × A × Y × q to the power Y − 1
- Y
- the number of whole years
Worked example
$10,000 a month, raised 10% every year, for 10 years at 12% a year
i = 12 ÷ 12 ÷ 100 = 0.01; q = 1.0112 = 1.126825; g = 1.10
A = (1.126825 − 1) ÷ 0.01 × 1.01 = 12.8093
FV = 10,000 × 12.8093 × (1.12682510 − 1.1010) ÷ (1.126825 − 1.10) = $33,74,326
Invested $19,12,491; the SIP reaches $23,579 a month in year 10
A level $10,000 SIP for the same 10 years: $23,23,391
With prices rising 4% a year, 33,74,326 ÷ 1.0410 = $22,79,574 in today's money
10,000 a month at 12%, by annual step-up
| Step-up | 10 years | 15 years | 20 years |
|---|---|---|---|
| 0% | $23,23,391 | $50,45,760 | $99,91,479 |
| 5% | $27,86,942 | $65,30,752 | $1,37,37,623 |
| 10% | $33,74,326 | $86,83,849 | $1,98,88,715 |
| 15% | $41,18,727 | $1,18,35,225 | $3,02,55,942 |
Why a step-up matters, and what it assumes
Most people’s income rises over a working life, and a SIP fixed at its first-year amount becomes a smaller share of that income every year. A step-up SIP — some fund houses call it a top-up — raises the instalment by a set percentage once a year. In the example, raising $10,000 by 10% a year ends at about $33,74,326 after 10 years against $23,23,391 for the level SIP, because you also invest more: $19,12,491 rather than $12,00,000.
The calculation treats each year as a level 12-month SIP and adds the years up as a geometric series, which gives an exact closed form. It uses the same convention as the SIP calculator: the annual return divided by 12 as the monthly rate, and each instalment invested at the start of its month. Calculators that use the compounding-exact monthly rate or end-of-month instalments will show a somewhat lower figure for the same inputs.
The chart and table show the plan a year at a time: the monthly SIP that year, the total you have put in, and the estimated value, which reaches about $9,84,570 after 5 years in the example. The teal line is the same value in today’s money. A final figure twenty or thirty years away sounds larger than it will feel, because prices rise too; at the default 4% inflation, the example’s $33,74,326 buys about what $22,79,574 buys today. Your pay may rise with inflation, which is one reason a step-up is worth having.
The return is an assumption. Fund returns vary from year to year, and in a step-up SIP the largest instalments come last, so the final years’ markets weigh more heavily than in a level SIP. Gains on redemption are usually taxable. To work backwards from a target amount use the SIP goal calculator. This is arithmetic on the figures you enter, not financial advice.
Frequently asked questions
How is a step-up SIP calculated?
Each year is a level 12-month SIP; the years are summed as a geometric series. FV = P × A × (qY − gY) ÷ (q − g). $10,000 a month stepped up 10% a year for 10 years at 12% gives about $33,74,326.
Is a step-up SIP the same as a top-up SIP?
Yes, the two names are used for the same facility. Some fund houses let you raise the SIP by a fixed amount rather than a percentage; this calculator uses a percentage.
What step-up percentage should I use?
One you can sustain. Many people match it roughly to expected pay rises. A step-up you later have to stop helps less than a smaller one you keep.
Why does another step-up calculator give a different answer?
Usually because it converts the annual return to a monthly rate differently, assumes end-of-month instalments, or raises the SIP at a different point. The convention used here is stated under the result.
What is the value in today’s money?
The estimated value divided by the rise in prices over the years invested, (1 + inflation)years. At 4% inflation, $33,74,326 after 10 years buys about what $22,79,574 buys today.
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References
- Securities and Exchange Board of India (SEBI) / Association of Mutual Funds in India (AMFI). Mandatory risk statement for mutual fund communications: “Mutual fund investments are subject to market risks, read all scheme related documents carefully.”
- Brealey RA, Myers SC, Allen F. Principles of Corporate Finance. McGraw-Hill. Present values, annuities and growing annuities.
- Central-bank inflation targets used as default inflation by currency: Reserve Bank of India (4% CPI, flexible inflation targeting framework); U.S. Federal Reserve (2% PCE); European Central Bank (2%); Bank of England (2% CPI); Bank of Canada (2%); Reserve Bank of Australia (2–3%); Bangko Sentral ng Pilipinas (3% ± 1). Actual inflation often runs above target.