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How to use the step-up sip calculator
- 1Enter the monthly amount you are starting with.
- 2Set the percentage you will raise it by each year — 10% roughly tracks a typical salary increment.
- 3Choose an expected annual return and the number of years.
- 4Compare the result against the flat-SIP figure shown beneath it.
Why a flat SIP quietly shrinks every year
A SIP of ₹5,000 a month started today is not a SIP of ₹5,000 a month in ten years. It is a SIP of about ₹2,800 in today's money, because inflation has eaten the rest. Meanwhile your salary has probably doubled. The proportion of your income going into the market has therefore halved without you deciding anything.
That is the argument for a step-up. Raising the contribution by roughly your annual increment keeps the investment constant as a share of income, which is the thing you actually intended to hold constant. Most fund platforms support it as a standing instruction, so it happens without a decision each year — which matters, because the decision is the part people skip.
The effect is larger than intuition suggests, and it is not simply that you invest more. The early increases compound for almost the whole period. A 10% annual step-up on a ₹5,000 SIP over twenty years typically ends up worth more than double the flat equivalent, and roughly half of that gap is growth on the extra contributions rather than the contributions themselves.
How the maths works here
The calculation is month by month rather than by a closed-form annuity formula, because a step-up SIP does not have a tidy one. Each month's contribution is added to a balance that grows at one-twelfth of the annual return, and at the end of each year the monthly amount is multiplied by the step-up percentage.
That means the step-up applies from the thirteenth month, not the first — which matches how fund houses implement it, and is a small but real difference from calculators that increase the amount from day one.
The flat comparison runs in the same loop with the starting amount held constant, so the two figures are computed under identical return assumptions and differ only in the contribution pattern. Comparing against a separately-computed number is where rounding differences creep in and make the gap look larger or smaller than it is.
Choosing a step-up percentage
Ten per cent is the common default and is roughly the long-run average salary increment in India, which makes it a reasonable proxy for holding your savings rate steady. If your income is rising faster than that — early career, or after a switch — a higher step-up simply keeps pace.
There is an argument for setting it slightly above your expected increment rather than equal to it. Doing so raises your savings rate gradually, which is far easier to sustain than a step change, and it counteracts lifestyle inflation at the point where the money would otherwise disappear into higher fixed costs.
What matters more than the exact number is that it is automatic. A step-up you have to remember to action each year is a step-up that stops after the second year. Set it as a standing instruction when you start the SIP.
What the projection does not promise
The return is an assumption. Equity funds do not deliver a smooth 12% a year; they deliver something wildly different every year that may average out to something like that over long periods. A projection at a constant rate tells you what compounding does to a contribution pattern, not what the market will do to your money.
It also ignores costs and taxes. Expense ratios reduce the return you actually receive, and equity gains above the annual exemption are taxed on redemption. Both are small relative to the compounding effect over long horizons, but neither is zero.
And it assumes the SIP continues uninterrupted. The most common reason a real SIP underperforms a projected one is not the market — it is that the investor stopped during a fall. The step-up makes that harder in a useful way: an instruction that increases automatically is one you have to actively cancel rather than passively abandon.
Frequently asked questions
When does the first step-up apply?
After twelve months. The first year runs at the starting amount, then the monthly figure rises by your chosen percentage at the start of each subsequent year — which is how fund houses implement a top-up instruction.
How much difference does a step-up really make?
More than most people expect. A 10% annual step-up over twenty years typically ends up worth more than double the flat equivalent, because the early increases compound for nearly the whole period. The comparison figure is shown beside the result.
What step-up percentage should I choose?
Roughly your expected annual salary increment — around 10% for many people — keeps your investment constant as a share of income. Setting it slightly higher raises your savings rate gradually, which is easier to sustain than a sudden increase.
Can I set this up with my fund house?
Yes. Most platforms offer it as a top-up or step-up SIP instruction when you start the SIP, applied automatically each year. Making it automatic matters, because a manual annual increase is one people stop doing.
Is the projected return guaranteed?
No. Equity returns vary enormously year to year and the figure here is a constant-rate assumption. It shows what compounding does to a contribution pattern, not what markets will do.
Is anything I enter uploaded?
No. The whole calculation happens in this browser tab and nothing is transmitted.