What is a step-up SIP?

A step-up (or top-up) SIP raises the monthly instalment by a fixed percentage or amount once a year. With a 10% step-up, ₹10,000 a month becomes ₹11,000 in year 2, ₹12,100 in year 3 and so on.

How much does a 10% step-up add to a ₹10,000 SIP over 20 years?

At an assumed 12% return, a flat ₹10,000 SIP grows to about ₹99.9 lakh from ₹24 lakh invested. With a 10% yearly step-up it grows to about ₹1.99 crore, but you invest about ₹68.7 lakh.

Is a step-up SIP better than a bigger flat SIP?

For the same total money invested, a flat SIP that starts higher grows more, because each rupee is invested earlier. A step-up suits people whose income rises over time and who cannot afford the higher amount today.

Step-Up SIP: How Much More Does a Yearly Increase Build?

Q: When does the step-up apply in the Lazyblink SIP Calculator?

The amount increases once every 12 months: months 1 to 12 use the starting amount, months 13 to 24 use the first increased amount, and so on.

The short answer

A step-up SIP raises your monthly investment by a fixed percentage once a year. At an assumed 12% return over 20 years, a flat ₹10,000 SIP grows to about ₹99.9 lakh, while the same SIP with a 10% yearly step-up grows to about ₹1.99 crore. The catch is that you also invest much more of your own money: ₹68.7 lakh instead of ₹24 lakh. You can test any step-up rate in the SIP Calculator.

How a step-up SIP works

You choose a starting amount and an annual increase. Every 12 months the instalment rises by that percentage of the previous year's amount, so the increases compound:

Year	Monthly SIP with 10% step-up
1	₹10,000
2	₹11,000
3	₹12,100
4	₹13,310
5	₹14,641
10	₹23,579
20	₹61,159

By year 20 the monthly instalment is more than six times the starting amount. That is the whole idea: the SIP grows as your income is expected to grow, instead of staying fixed while your salary rises.

Fund houses usually also offer a fixed-amount top-up (for example, ₹1,000 more each year). The calculator models the percentage version.

₹10,000 a month for 20 years at different step-up rates

All figures assume a constant 12% annual return, compounded monthly, with each instalment invested at the start of the month. Real returns vary, so these are estimates.

Annual step-up	Expected corpus	Total invested	Corpus ÷ invested
0% (flat)	₹99.9 lakh	₹24.0 lakh	4.16×
5%	₹1.37 crore	₹39.7 lakh	3.46×
10%	₹1.99 crore	₹68.7 lakh	2.89×
15%	₹3.03 crore	₹1.23 crore	2.46×

Two things happen at once:

The final corpus rises sharply. A 10% step-up roughly doubles the result compared with a flat SIP.

Each rupee works for less time. The bigger instalments arrive in later years, so they have fewer years to grow. That is why the corpus-to-investment multiple falls from 4.16× to 2.89× as the step-up rises.

Neither point is a problem. It simply means most of the extra corpus comes from the extra money you put in, not from some special effect of stepping up.

Step-up versus a bigger flat SIP

A fair comparison holds the total money invested constant. A 10% step-up from ₹10,000 puts in about ₹68.7 lakh over 20 years. A flat SIP putting in the same ₹68.7 lakh would be about ₹28,638 a month from day one, and at 12% it grows to about ₹2.86 crore, well above the step-up's ₹1.99 crore.

So, for the same total contribution, starting high beats starting low and increasing. The step-up wins on a different measure: affordability. Most people cannot invest ₹28,638 a month at the start of their career but can manage ₹10,000 and raise it with each increment. The step-up lets you invest more over your life than you could if you waited until you could afford the bigger amount.

How to model a step-up in the calculator

Open the SIP Calculator.

Set Monthly SIP to your starting amount (the slider moves in ₹500 steps from ₹500 to ₹1,00,000).

Set Expected return (p.a.) and Investment period in years.

Move Annual step-up to the yearly increase you plan, anywhere from 0% to 25%.

Read Total invested, Expected corpus and Wealth gained, then check the year-by-year figures.

In this calculator the increase applies once every 12 months: months 1 to 12 use the starting amount, months 13 to 24 use the first increased amount, and so on. Many fund houses let you choose the month in which the top-up takes effect, which shifts real results slightly.

Worked example: a smaller starting SIP

₹5,000 a month for 15 years at an assumed 12%:

Flat: about ₹25.2 lakh from ₹9 lakh invested.
10% step-up: about ₹43.4 lakh from ₹19.1 lakh invested.

The step-up adds about ₹18 lakh to the corpus, of which about ₹10 lakh is extra money you invested and the rest is growth on it.

Choosing a step-up rate

Link it to expected pay rises. If your increments have averaged 8%, a 10% step-up will eat into your spending money every year. A rate at or a little below your typical raise is easier to sustain.
Check the year-20 instalment. At 15%, ₹10,000 becomes about ₹1.42 lakh a month in year 20. Make sure that figure is realistic for your future income.
Remember you can pause. Most fund houses let you stop the top-up or the SIP itself. A plan you can keep beats an aggressive plan you abandon.
Run a lower return too. At 10% instead of 12%, the 20-year 10% step-up example drops from about ₹1.99 crore to about ₹1.61 crore.

Common mistakes

Comparing corpus without comparing money invested. A larger corpus that needed three times the contributions is not three times better.
Assuming the step-up rate is a return. The step-up is how much more you put in, not how much the fund earns.
Forgetting inflation. A ₹1.99 crore result in 20 years buys much less than ₹1.99 crore today.
Treating calculator results as guaranteed. Mutual fund returns move with markets, and a constant 12% every year will not happen in practice.

To see how much a flat SIP needs to reach a round target, read How Much SIP Do I Need for ₹1 Crore?. For the basics of how SIP returns are calculated, see SIP Calculator Guide: How to Calculate Mutual Fund Returns.