Why step up a SIP at all
A plain SIP invests the same amount every month for its entire life. A step-up SIP (also called a "top-up SIP") increases that amount by a fixed percentage once a year — typically timed to a salary hike. The logic is simple: if your income is growing 8–10% a year, an investment that stays flat is quietly shrinking as a share of what you earn.
The effect compounds in two directions at once — later instalments are both larger and have less time left to grow, while earlier, smaller instalments have the most time of all. A step-up SIP usually lands meaningfully ahead of a flat SIP at the same starting amount, without ever feeling like a bigger commitment than your last raise.
How this is calculated
There's no single closed-form formula for a step-up SIP the way there is for a flat one, because the monthly contribution itself changes — this calculator compounds each month's instalment individually for however many months are left until maturity, then increases the monthly amount by your step-up percentage at the start of each new year, and sums the result. It's the same underlying monthly-compounding math as a regular SIP, just applied instalment by instalment instead of all at once.
Frequently asked questions
How is a step-up SIP different from just investing more each month?
It isn't fundamentally different — a step-up SIP is exactly that, done automatically on a schedule you set once. Most fund houses let you register the annual increase upfront so you don't have to remember to raise it by hand every year.
What step-up percentage should I use?
A common starting point is matching your expected annual salary increment — often 8-10% for a salaried professional in India — so the SIP grows in step with your income rather than becoming a shrinking share of it.
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