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Step-up SIP explained: how a 10% yearly increase changes the SIP you need

By Abhishek Sambangi · Updated 19 September 2026 · 8 min read

What is a step-up SIP?

A step-up SIP is a systematic investment plan whose instalment rises at a set interval, usually once a year, by a percentage or a rupee amount you choose when you register it. Everything else about the SIP stays the same: the scheme, the date and the way units are allotted.

The idea is simple. Salaries tend to rise over a working life, and a flat SIP ignores that. A ₹10,000 SIP that never changes is a smaller and smaller share of your income each year. A step-up SIP keeps saving in line with earning.

SIPs are now a mainstream habit: AMFI recorded ₹32,087 crore of SIP contributions from 9.72 crore contributing accounts in March 2026. The step-up is the feature that decides whether those instalments keep pace with income.

What is the step-up amount in a SIP?

The step-up amount is the increase applied at each interval. A percentage step-up compounds: 10% on ₹10,000 adds ₹1,000 in year two and ₹5,560 by year twenty. A fixed-rupee step-up adds the same amount every year, so it is gentler later on. Some fund houses also allow a half-yearly interval and a cap beyond which the SIP stops rising.

Working: SIP in year y = first SIP × (1 + step-up)^{y − 1}, or first SIP + ₹1,000 × (y − 1).

Why does a 10% step-up change the SIP you need to start with?

Because part of the saving is moved to later years, when you expect to earn more. For the same goal, the first instalment falls sharply — to about half for a 20-year goal — while the last instalments are much larger than a flat SIP would have been.

The goal below is ₹1 crore in 20 years, with an assumed return of 11% a year.

The 11% return is an assumption, not a forecast or a promise; no market data is used anywhere in this article. SIPs are paid at the start of each month and raised after every twelfth instalment — the same convention as our SIP calculator, which reproduces these figures.

Two things stand out. With a 10% step-up the first SIP is 49% of the flat one, and it passes the flat figure in year 9. And every step-up row invests more rupees in total, because money put in later has less time to compound. A step-up SIP does not earn more per rupee. It changes when you invest, to match when you can afford to.

Step-up SIP vs normal SIP: what if the starting amount is the same?

If you start both at the same amount, the step-up SIP ends far larger, simply because far more money goes in. Starting at ₹10,000 a month for 20 years at an assumed 11% a year:

Assumed return, not a promise. Comparing the final values alone is misleading; compare them with the rupees invested.

How does the time horizon change the effect?

The longer the goal, the more a step-up lowers the starting SIP, because there are more years of increases to lean on. For ₹1 crore at an assumed 11% a year:

This is the arithmetic behind the worked example in our retirement corpus article, where a 25-year plan needs ₹13,275 a month with a 10% step-up against ₹31,204 flat.

What is the step-up SIP formula?

For a yearly percentage step-up, the future value is FV = P × S × [(1 + R)ⁿ − (1 + g)ⁿ] ÷ (R − g).

• P — the first monthly SIP; g — the yearly step-up; n — the number of years.
• r — the monthly return, taken as the annual return ÷ 12.
• R = (1 + r)¹² − 1, the effective yearly return.
• S = [(1 + r)¹² − 1] ÷ r × (1 + r), the value at the end of a year of twelve ₹1 instalments paid at the start of each month.

Check it with ₹10,000, 10% and 20 years at 11%. r = 0.9167%, so R = 11.572% and S = 12.7396. (1.11572)²⁰ = 8.9350 and (1.10)²⁰ = 6.7275; the difference is 2.2075. FV = 10,000 × 12.7396 × 2.2075 ÷ 0.015719 = ₹1.79 crore, matching the table. With g = 0 the same formula gives the flat SIP: ₹87.36 lakh. To find the SIP for a goal, divide the goal by the value for P = ₹1.

In Excel. With the return in B1, the step-up in B2, the years in B3 and the first SIP in B4:

=B4*(((1+B1/12)^12-1)/(B1/12)*(1+B1/12))*((1+B1/12)^(12*B3)-(1+B2)^B3)/((1+B1/12)^12-1-B2)

A month-by-month sheet is easier to audit: one row per month, balance = (previous balance + SIP) × (1 + r), and the SIP column rising after every twelfth row. It also handles rupee step-ups, half-yearly steps and an opening lump sum, which the closed formula does not.

Step-up SIP with inflation: is a 10% raise really a raise?

Partly. If prices rise 6% a year, a flat ₹10,000 SIP is worth about ₹3,305 of today's money by year 20 — a flat SIP is really a shrinking one. A 10% step-up is a real increase of about 3.8% a year (1.10 ÷ 1.06 − 1). A step-up near the inflation rate merely keeps your saving constant in real terms.

The goal needs the same treatment. ₹1 crore received 20 years from now buys what ₹31.18 lakh buys today at 6% inflation. If what you mean is ₹1 crore of today's purchasing power, the target becomes ₹3.21 crore, and the required SIP becomes ₹36,713 flat, or ₹17,926 to start with a 10% step-up. The goal mode of our SIP calculator inflates the target for you.

What can go wrong with a step-up plan?

• The increases do not happen. Start at ₹5,589 and stop stepping up after five increases, and the plan reaches about ₹69 lakh — 31% short of ₹1 crore. Never step up at all and it reaches ₹48.8 lakh, under half.
• Income grows more slowly than the step-up. By year 20 the 10% plan asks for ₹34,184 a month, six times the first instalment. If pay rises 6% a year, a 10% step-up takes a growing share of it.
• The return assumption is wrong. The first SIP for the same goal is ₹6,842 at an assumed 9% and ₹4,509 at 13%. Market-linked returns are uncertain and can be negative for long stretches; no step-up changes that.
• The mandate is too small. A bank mandate has a maximum amount. If it is set at today's SIP, a later instalment can fail.

How do people put a step-up into practice?

There are two common routes. One is to choose the top-up option when registering the SIP, giving the percentage or amount, the interval and any cap; the increases then happen without further action. The other is manual: each year, in the month a pay rise arrives, start an additional SIP or raise the existing one. The automatic route removes a decision that is easy to postpone. The manual route lets the increase follow the actual raise. Terms for changing or stopping a top-up differ by fund house and platform, so read them before registering.

Related reading

• SIP calculator, with step-up and goal modes
• Retirement calculator
• How much retirement corpus do I need?
• Regular vs direct mutual fund plans: what a 1% cost gap does
• Home loan prepayment vs SIP

FAQ

Sources and method: all figures computed by us on 19 Sep 2026 with the method of our SIP calculator — monthly rate = annual rate ÷ 12, instalments at the start of each month, step-up after every twelfth instalment. Returns and inflation are assumptions, not forecasts. SIP industry data: AMFI Monthly Note, March 2026 (data to 31 Mar 2026; nothing more recent is used). How SIPs work: Mutual Funds Sahi Hai (AMFI investor education); top-up terms are in each fund's scheme information document. All checked 19 Sep 2026.

Education only. This article does not recommend any fund, product or asset allocation and is not investment advice. Mutual fund investments are subject to market risks. Spotted an error? Write to us.

Abhishek Sambangi

Co-founder, Financial Education & Technology · About