What step-up percentage is realistic?

Many people match it roughly to how fast they expect their own income to grow, which varies enormously by industry and career stage. Setting it above your realistic income growth produces a plan you cannot actually follow.

How much difference does a step-up really make?

More than most people expect, because the increases compound as well. Over long tenures the extra contributions arrive early enough to keep growing, so the gap against a flat SIP widens with every year. Set the step-up to 0 and back to see the difference on your own numbers.

Do fund houses actually support this?

Most Indian AMCs and platforms offer a step-up or top-up SIP facility that raises the instalment automatically on a schedule you set. Where it is not available you can achieve the same thing by manually increasing the amount each year, or by starting an additional SIP.

Is this different from just starting with a bigger SIP?

Yes, and usually more achievable. A larger flat instalment demands the money now; a step-up asks for it later, when your income is likely higher. A flat SIP at the same total contribution will generally finish slightly ahead, because its money went in earlier — but only if you could actually have afforded it from the start.

Step-Up SIP Calculator

A step-up SIP raises your monthly instalment by a fixed percentage every year, which is closer to how most people invest as their income grows. This shows how much difference that yearly increase makes against a flat SIP.

Check the working

A worked example

A fixed case, for reference.

Take ₹10,000 a month for 3 years with a 10% annual step-up. The instalment changes each year, so the contributions are counted year by year.

Year 1 instalment
$P_1 = 10{,}000$
Year 2 instalment
$P_2 = 10{,}000 \times 1.10 = 11{,}000$
Year 3 instalment
$P_3 = 11{,}000 \times 1.10 = 12{,}100$
Total contributed
$12 \times (10{,}000 + 11{,}000 + 12{,}100) = 3{,}97{,}200$

A flat ₹10,000 SIP over the same three years would contribute ₹3,60,000. The step-up adds ₹37,200 of contributions — and because the extra money also compounds, the gap in the final value is wider still.

The formula

FV = \sum_{k=0}^{y-1} \; \sum_{m=1}^{12} P (1+s)^{k} (1+i)^{\,n - 12k - m + 1}

Each instalment is stepped up once per completed year, then compounds for the months remaining.

i = \frac{r}{1200} \qquad s = \frac{\text{step-up }\%}{100}

Monthly rate, and the annual step-up as a decimal.

What each symbol means

FV: projected value at the end of the tenure
P: the instalment in the first year
s: the annual step-up, as a decimal
i: the monthly rate
k: the year index, starting at zero
y: the tenure in years

What this assumes, and where it stops

Assumptions

The return you enter is earned steadily, every month, for the whole tenure. Real markets do not behave this way — the same average delivered in a different order produces a different result.
The step-up applies on each anniversary, so the first twelve instalments are always at the amount you entered.
The increase is compounding: a 10% step-up on ₹11,000 is ₹12,100, not ₹12,000.
You can afford every increase for the full tenure.
Each instalment is invested at the start of the month.

Limitations

A step-up assumes your income rises at least as fast as the percentage you set. If it does not, the plan becomes unaffordable partway through.
Taxes are not modelled. Capital gains tax on redemption reduces what you actually receive.
Costs are not modelled: expense ratio, exit load, and any transaction charges all reduce real returns.
This is a projection from a fixed assumption, not a forecast. Returns vary year to year and can be negative for long stretches.

What this calculator does

Projects a SIP whose instalment rises on every anniversary.
Shows the instalment you would be paying in the final year, which is often much larger than the first.
Separates your contributions from the growth the assumed return provides.
Lets you set the step-up to zero to compare directly against a flat SIP.

Common questions

Different questions about the same money. These use the same conventions, so the numbers are comparable.

SIP Calculator
Project what a monthly SIP could grow to over time, and see how much of the total is your own contribution versus assumed returns.
Inflation Calculator
Find what a sum today is worth in future purchasing power, and what a future target costs in today’s money.
Investment Goal Calculator
Start from the amount you want and work backwards to the monthly investment it would take to get there.