Key takeaways
- Step-up changes how much you pay in, not the market’s behaviour.
- Compare a level SIP and a step-up SIP on the same assumed rate so you can see the contribution effect.
- An annual percentage step-up tied to a hoped-for increment can fail if the increment does not arrive.
- Illustrated corpus is not guaranteed.
A plain SIP keeps the same rupee amount every month. A step-up SIP raises that amount on a timetable you choose — commonly once a year, by a fixed percentage or a fixed rupee increment. Fund platforms market this as a way to “keep pace with salary.” The mechanism is simpler than the marketing: you are just investing more money later.
What the calculator is adding up
Finaura’s step-up SIP calculator still needs an assumed annual return. Each month’s contribution is then grown for the months that remain. When the instalment steps up, later months contribute more principal. The corpus is larger than a level SIP mostly because the invested amount is larger, and only partly because those extra rupees also compound.
A worked illustration
Suppose you start at ₹10,000 a month, assume 10% a year, and run for 15 years. That is a level SIP: 180 contributions of ₹10,000, or ₹18 lakh invested, plus whatever the assumed rate adds.
Now keep the same 10% assumption but raise the SIP by 10% each year. Year 1 is ₹10,000 a month; year 2 is ₹11,000; year 3 is ₹12,100, and so on. You will have invested more than ₹18 lakh. The illustrated corpus will be higher. If you want to know how much of the gap is “magic compounding” versus “you paid more,” compare invested amounts in both calculator runs. That comparison is the educational point.
When a step-up sketch is useful
- You already save a SIP and expect spare cash to rise slowly.
- You want a retirement or education target that a level SIP does not reach without an implausible rate assumption.
- You want to see how painful the later instalments become — a 10% annual step-up roughly doubles the monthly debit in a little over seven years.
When it is the wrong sketch
If your income is unstable, a rising commitment can become the first expense you cut — which undoes the illustration. If the goal is near (three years, a wedding), equity-style return assumptions plus a step-up still do not make the corpus safe. Use a deposit-style tool for money you cannot lose in that window.
Try it yourselfTry a step-up SIP projectionSet the starting instalment, step-up rate or amount, assumed return and years. Read invested amount and illustrated corpus separately.Limitations
Same as any SIP projection: no guarantee, no tax, no expense ratio, no sequence-of-returns risk. The step-up feature does not fix those gaps. It only changes the contribution path you type in.