Step-up SIP calculator — see what raising your SIP every year adds up to

How to use the step-up SIP calculator

1. Enter the Starting monthly SIP, the amount you invest each month in the first year.
2. Enter the Annual step-up as a percentage. 10 means each year’s monthly amount is 10% higher than the year before. Use 0 to see a plain SIP.
3. Enter the Expected return (per year). This is your assumption, not a promise from any fund.
4. Set the Duration in years and choose a Currency.
5. Read the Projected value, Amount invested and Estimated gain. The Without step-up figure shows what the same starting SIP would reach if it never rose, and Final-year monthly SIP shows how large your instalment becomes.
6. Use the chart to compare the two paths, and the Year-by-year table (downloadable as CSV) to see each year’s monthly SIP, total invested and value.

What it does and when to use it

Most people’s income rises over time, but a SIP set up years ago often stays at its original amount. A step-up SIP links your investing to that rising income. Instead of ₹10,000 a month for 15 years, you plan ₹10,000 in year 1, then a little more each year.

The calculator helps with three practical decisions:

• Choosing a step-up rate. Try 5%, 10% and 15% and see how the final value and the final-year instalment change. A step-up that grows faster than your salary may become hard to keep up.
• Checking a target. If you have a goal in mind, adjust the starting amount and step-up until the projected value reaches it. For a fixed monthly amount needed to hit a goal, the savings goal calculator works the other way round.
• Seeing the cost of waiting. Compare a smaller SIP with a step-up against a larger flat SIP. The table makes clear how much you invest in each case, not only what you end with.

SEBI describes a SIP as a way to “invest as you earn”, putting in a fixed sum at regular intervals instead of a single lump sum. A step-up keeps that habit but lets the amount grow. If you are deciding between investing a lump sum now and spreading it out, the lumpsum calculator shows the one-time route, and the plain SIP calculator covers a SIP that never changes.

How it works

The calculator simulates the plan month by month.

1. The yearly return is turned into a monthly rate: i = annual rate ÷ 12 ÷ 100. At 12% a year, i = 0.01.
2. Each month, the instalment is added to the balance at the start of the month and the whole balance then grows by one month’s return: balance = (balance + SIP) × (1 + i).
3. After every 12 months, the monthly SIP is raised: new SIP = old SIP × (1 + step-up ÷ 100).
4. This repeats for the number of years you entered. The final balance is the projected value.

So the monthly SIP in year k is:

SIP in year k = starting SIP × (1 + s)^(k − 1), where s is the step-up as a decimal.

For the Without step-up comparison, the calculator uses the standard SIP formula with the same start-of-month timing:

M = P × ((1 + i)^n − 1) ÷ i × (1 + i), where P is the monthly SIP and n the number of months.

Because the step-up version uses the same timing and the same monthly rate, setting the step-up to 0 gives exactly the same figure as the flat SIP. That is a useful check: ₹10,000 a month for 15 years at 12% gives ₹50,45,760.00 both ways.

A short hand check. In year 1 with ₹10,000 a month at 1% a month, the first instalment grows for 12 months and the last for 1 month. The year-1 value is ₹1,28,093.28 in the table. In year 2 the SIP becomes ₹11,000, and those new instalments are added on top of the year-1 balance, which keeps compounding.

Worked examples

These figures come from the calculator’s own function.

A 10% yearly step-up over 15 years. Starting monthly SIP ₹10,000, annual step-up 10%, expected return 12%, duration 15 years:

• Projected value: ₹86,83,849.43
• Amount invested: ₹38,12,697.80
• Estimated gain: ₹48,71,151.63
• Without step-up: ₹50,45,760.00
• Final-year monthly SIP: ₹37,974.98

Some rows from the year-by-year table:

The step-up plan ends about ₹36.4 lakh ahead of the flat SIP. But it also puts in about ₹20.1 lakh more of your own money. The extra gain from the step-up is therefore roughly ₹16.3 lakh: ₹48.7 lakh of gain against ₹32.5 lakh for the flat SIP.

The same plan with no step-up. Starting SIP ₹10,000, step-up 0%, 12%, 15 years. Projected value ₹50,45,760.00, amount invested ₹18,00,000.00, estimated gain ₹32,45,760.00. Final-year monthly SIP stays at ₹10,000.00.

A gentler 5% step-up over 10 years. Starting SIP ₹5,000, step-up 5%, expected return 10%, 10 years. Projected value ₹12,48,369.41 from ₹7,54,673.55 invested. Without the step-up the same SIP would reach ₹10,32,760.10. The final-year monthly SIP is ₹7,756.64, about one and a half times the starting amount.

How to read the comparison fairly

A step-up SIP always ends with a bigger number than a flat SIP at the same starting amount, simply because you put in more. Three figures help you judge it honestly:

• Amount invested tells you the real cost of the plan.
• Estimated gain is what the assumed return added to your money.
• Final-year monthly SIP is the instalment you must be able to pay at the end. If 10% a year takes you from ₹10,000 to almost ₹38,000 a month, ask whether your income is likely to grow that much.

If the final instalment looks too high, lower the step-up rate or shorten the duration. If you want to compare a step-up SIP with a larger flat SIP, set the flat amount on the SIP calculator to give a similar total invested, then compare the values.

To see how an assumed return turns into growth over time, the compound interest calculator offers other contribution frequencies and its own step-up option.

Limits and tips

• The return is an assumption. Mutual fund investments are subject to market risks. A constant 12% a year is a modelling convenience; real returns arrive unevenly and can be negative for whole years. Try a lower rate, such as 8%, to see a cautious case.
• Whole years only. The duration is rounded to the nearest whole year because the step-up happens once a year.
• Timing. Each instalment is invested at the start of its month and the step-up happens at the start of each new year. A fund’s actual SIP date and the price of units on that date will make real results differ.
• No tax, fees or inflation. The projection does not deduct capital gains tax, fund expenses or exit loads, and the result is in future money. The inflation calculator can translate it into today’s money.
• Fund rules vary. Fund houses set their own step-up options, such as a fixed amount or a percentage and how often it applies. Check what your fund offers before you plan around a particular rate.
• Not advice. The calculator shows what the numbers you enter would produce. For a plan that fits your income, goals and risk, speak to a SEBI-registered investment adviser.
• Everything is worked out in your browser; nothing you enter is sent anywhere.