What is a step-up SIP?

It is a SIP whose monthly contribution rises by a set percentage each year instead of staying fixed. It is also called a top-up SIP, and it is normally used to keep contributions growing in line with income.

How is a step-up SIP calculated?

The monthly amount for year y is the starting amount multiplied by (1 + step-up)^(y−1). Each instalment is then compounded forward for the months remaining in the period and the results are added together — there is no single closed-form shortcut once the amount changes.

How much extra will a 10% step-up actually produce?

It depends on the period and assumed return, which is why the comparison table below the calculator recalculates a level SIP alongside your inputs. On a 10-year, 12% projection, a 10% step-up on a ₹10,000 SIP raises the projected corpus by about 45% — while also contributing roughly 60% more money.

Is a step-up SIP better than simply starting with a larger SIP?

Starting larger puts more money to work earlier, so for the same total contribution it generally projects higher. A step-up is useful when you cannot afford the larger amount today but expect to later — it is a cash-flow choice as much as an investment one.

What happens if I set the step-up to 0%?

The result becomes identical to a plain SIP at the starting amount. That is a useful way to sanity-check the comparison — the difference row drops to zero.

Are step-up SIP returns guaranteed?

No. Step-up SIPs invest in the same market-linked products as ordinary SIPs. The step-up changes how much you contribute, not the certainty of the return.

Investment · FINANCIAL TOOLS

Step-up SIP Calculator

Model a SIP that increases by a fixed percentage every year and compare it with a level SIP.

Understand the calculation

Calculation logic, formula, example and guardrails behind the estimate.

How it works

The monthly amount is held level within each investment year and increased by your step-up percentage on every anniversary. A ₹10,000 SIP with a 10% step-up runs at ₹10,000 through year 1, ₹11,000 through year 2, ₹12,100 through year 3, and so on — the increase compounds on the previous year's amount, not on the original one.

Every instalment is then compounded forward to the end of the period at the monthly equivalent of your expected return, exactly as in the plain SIP calculator. Contributions are assumed to be made at the start of each month.

More detail

Because early increases have the longest left to compound, the step-up affects the outcome most when it starts early in a long period. Adding the same increases in the last few years contributes contributions but very little compounding.

The comparison table runs a level SIP at the same starting amount over the same period, so you can see both the extra corpus and the extra money it took to get there. Judging a step-up on the corpus difference alone overstates the effect.

To see the same instalment held flat instead, use the plain SIP calculator.

If you have a target amount in mind, work backwards with the goal-based SIP calculator.

Formula

FV = Σ Pᵧ × (1 + i)^(n − m + 1) where Pᵧ = P₁ × (1 + s)^(y − 1)

There is no clean closed form once the contribution changes each year, so the calculator sums each month's instalment individually. m is the instalment's month number, y the year it falls in.

FV: Projected corpus at the end of the period
P₁: Monthly SIP amount during year 1
Pᵧ: Monthly SIP amount during year y, after step-ups
s: Annual step-up rate as a decimal (10% is 0.10)
i: Monthly rate of return — annual return ÷ 12, as a decimal
n: Total number of monthly instalments (years × 12)
m: Instalment number, counting from 1

Worked example

₹10,000 a month with a 10% annual step-up for 10 years at an assumed 12% return.

01Year 1 monthly SIP₹10,000
02Year 2 monthly SIP₹10,000 × 1.10 = ₹11,000
03Year 3 monthly SIP₹11,000 × 1.10 = ₹12,100
04Year 10 monthly SIP₹10,000 × 1.10⁹ ≈ ₹23,579
05Total contributed≈ ₹19,12,491
06Projected corpus≈ ₹33,74,326
07Level ₹10,000 SIP for comparison₹12,00,000 contributed, ≈ ₹23,23,391 projected

The step-up adds roughly ₹7.1 lakh of contributions and about ₹10.5 lakh of projected corpus. The ₹3.4 lakh gap between those two figures is compounding on the extra contributions rather than the contributions themselves.

Important considerations

01
The step-up has to be affordable every year
A 10% annual increase compounds: after 15 years a ₹10,000 SIP becomes about ₹37,000 a month. Check that the later years are realistic against your expected income, not just the first few.
02
Compare like with like
A step-up SIP produces a bigger corpus partly because it invests more money. The comparison table separates the extra contribution from the extra growth for exactly this reason.
03
Returns remain an assumption
A constant expected return is applied throughout. Market-linked returns vary year to year, and no step-up schedule changes that — the projection is not a guarantee.
04
Check what your platform actually supports
Some fund houses and platforms cap the top-up percentage or amount, apply it only in fixed slabs, or require the step-up to be registered when the SIP starts. Confirm before assuming your plan can be implemented as modelled.
05
Increases are applied on the anniversary only
The model steps up once a year, on the SIP's anniversary. If you raise your contribution at a different cadence, the projection will be slightly off.

Limitations

It assumes you can afford every future increase. A 10% step-up compounds — after fifteen years a ₹10,000 instalment is around ₹37,000 a month.
It applies the increase once a year on the anniversary. Raising your contribution at any other cadence will not match the projection.
The return rate is held constant throughout, so the projection cannot show what a sequence of poor years would do.
Some platforms cap top-up percentages or apply them only in fixed slabs, so the schedule modelled here may not be implementable as-is.

Frequently asked questions

Common questions about the step-up sip calculator and the assumptions behind it.

Next useful checks

Move from this result to the next decision without hunting through the full calculator list.

Goal-Based SIP CalculatorTurn a target amount into a monthly investment.SIP vs Lumpsum CalculatorCompare investing all at once against monthly investing.CAGR CalculatorConvert start and end values into an annual return.

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Disclaimer

This calculator is provided for general information and planning only. It is not investment, tax or legal advice, and it does not take your personal circumstances into account. Outputs are estimates based on the assumptions stated on this page, exclude taxes and charges unless said otherwise, and market-linked returns are not guaranteed — the value of investments can fall as well as rise. Lending terms, rates and eligibility are decided by the lender. For advice on your own situation, speak to a qualified professional, several of whom you can consult on Finvestalk.