Step Up SIP vs Flat SIP: Raising Your ₹10,000 SIP by 10% a Year Doubles the 20 Year Corpus.
Step Up SIP Calculator Maths: What Raising Your SIP 10% Every Year Does Over 20 Years
Guide: Flat SIP vs Step Up SIP, Compared Year by Year With the Same Fund and the Same 12% Assumption
Two people start a ₹10,000 monthly SIP on the same day, in the same fund. One never touches it. The other raises it by 10% every year, just ₹1,000 more in year two. Twenty years later, one has about ₹1 crore. The other has nearly ₹2 crore.
ABHYUDAYA VIKRAM SINGH
October 2026 · DhanSutra.co.in · Investment Last reviewed: October 2026
8 MIN READ
Educational guide. All figures are illustrative calculations at an assumed 12% return, not forecasts or advice. Not investment advice.
A flat SIP of ₹10,000 a month for 20 years at an assumed 12% return grows to about ₹99,91,479. The same SIP raised by 10% every year grows to about ₹1,98,88,715, nearly double, for ₹44,73,000 of extra money invested over the whole period. By year 20 the monthly SIP is ₹61,159, which is what a rising income can usually carry.
THE NUMBERS AT A GLANCE
FLAT SIP, 20 YEARS
₹99,91,479
₹10,000 every month, never changed, from ₹24,00,000 invested
STEP UP SIP, 20 YEARS
₹1,98,88,715
₹10,000 rising 10% every year, from ₹68,73,000 invested
EXTRA CORPUS
₹98,97,236
More wealth than the flat SIP, for ₹44,73,000 of extra money put in
THE FLAT SIP IN YEAR 20
Still ₹10,000
Same rupees, but a much smaller slice of a salary that has grown for two decades
MONTHLY SIP IN YEAR 20 AT A 10% STEP UP
₹61,159
From ₹10,000 in year one: ₹11,000, ₹12,100, ₹13,310 and so on, each raise small on the day it happens
THE TWO IDEAS THAT EXPLAIN IT
THE TRAP
The Frozen SIP
A SIP set once and never revisited quietly shrinks as a share of your income. Salaries rise, costs rise, and the monthly amount stays the same. The money is not lost, it simply was never invested. The cost is invisible because nobody sends you a statement for the wealth you did not build.
Term coined by Abhyudaya Vikram Singh · DhanSutra.co.in
THE FIX
The Raise Rule
Every time income rises, raise the SIP by the same percentage on the same day, before the extra money finds a new lifestyle to belong to. A 10% raise in salary becomes a 10% raise in SIP. Take home pay still rises for the other 90%, so nothing feels like a sacrifice.
Term coined by Abhyudaya Vikram Singh · DhanSutra.co.in
Two SIPs, One Fund, Very Different Endings
Both investors pick the same diversified equity fund and assume the same long term return of 12% a year, which works out to about 1% a month. Both start with ₹10,000 on the first of the month. The only difference is what happens next.
The flat investor keeps ₹10,000 every month for 240 months and invests ₹24,00,000 in total. The step up investor raises the SIP by 10% at the start of each year. That is ₹11,000 in year two, ₹12,100 in year three, and ₹61,159 by year twenty. Total invested over 20 years: ₹68,73,000.
The Numbers Side by Side
Plan
Total invested
Value after 20 years
Multiple of money put in
Flat SIP, ₹10,000
₹24,00,000
₹99,91,479
4.16x
Step up 5% a year
₹39,67,914
₹1,37,37,623
3.46x
Step up 10% a year
₹68,73,000
₹1,98,88,715
2.89x
All values assume a constant 12% a year with monthly compounding and each instalment invested at the start of the month, before tax and expense ratio. Real returns are never a straight line.
The step up investor put in 2.9 times as much money and ended with 2 times as much wealth. The extra ₹44.7 lakh produced an extra ₹99 lakh.
Why the Later Money Still Matters
The usual argument is that early money matters most because it compounds longest. That is true, and it is why starting early still wins. But the step up plan does not replace early money, it adds to it. Every extra rupee in year ten still has ten years to compound, and in this plan, the amounts in the second half of the journey are large enough to matter.
By the end, about 65% of the step up corpus is growth and 35% is money you actually put in. In the flat plan, about 76% is growth. The step up plan is a bigger corpus, built from more of your own contribution, not a free lunch.
What a 10% Raise Feels Like Year by Year
Year
Monthly SIP at 10% step up
Increase over the previous year
1
₹10,000
Starting amount
2
₹11,000
+₹1,000
5
₹14,641
+₹1,331
10
₹23,579
+₹2,143
15
₹37,975
+₹3,452
20
₹61,159
+₹5,560
The early raises are tiny. A ₹1,000 increase against a salary that rose by 10% is a rounding error in your monthly budget. The big rupee numbers only show up late in the journey, when your income has had years to grow into them. If your income grows at a similar pace, the SIP stays the same slice of your take home pay the whole way.
Step Up Versus Starting Earlier
Both matter, and they work in different ways. A flat ₹10,000 SIP started five years earlier, so it runs for 25 years, grows to about ₹1,89,76,351. The step up SIP that runs for 20 years reaches ₹1,98,88,715. In this example, five years of extra time and a 10% yearly raise are roughly worth the same.
That is useful, not discouraging. If you are late, raising the SIP is the lever you still control. If you are early, doing both is very hard to beat.
When a Step Up Is Not the Right Move
A step up SIP is a good idea only when the base is already safe. Before raising the SIP, three things need to be in place.
1
Keep an emergency fund of six months of expenses outside equity.A SIP raise financed by money you may need next month will end up as a stopped SIP in a market dip, which defeats the purpose.
2
Clear any credit card or personal loan debt first.Paying 36 to 42% interest on a card while investing at an assumed 12% is a losing trade. Debt that expensive comes first.
3
Match the raise to your real income growth.If your income has not risen this year, a smaller step of 5%, or a fixed ₹500 or ₹1,000, still helps. Skipping one year is far better than cancelling the SIP.
How to Set It Up
1
Choose the step up percentage once, today.Deciding in advance beats deciding every year. Most people can sustain 5 to 10%.
2
Use the step up or top up option on the platform or fund house where you invest.Many platforms and fund houses offer it at the time of starting the SIP or by editing the existing one. The wording and options differ, so check yours.
3
Review the amount once a year, on the day your salary revision is credited.Treat it as part of the raise, not as a separate sacrifice.
4
Do not stop the SIP in a market fall.The instalments bought in a fall are the ones that do the heavy lifting later.
Assumption check: 12% is an illustrative long term assumption for diversified Indian equity funds. At 8% the step up plan ends 2.2 times ahead of the flat plan, and at 15% it is 1.8 times ahead. The step up plan wins by a wide margin across these assumptions, but actual returns can be lower, and negative in some years.
My Honest Take
Most people spend a lot of effort choosing the fund and almost none on the amount. Yet over 20 years, the habit of raising the SIP when income rises has a bigger effect than most fund choices.
If I had to give one rule, it would be this: never let a raise reach your bank account without a slice of it being sent to your SIP first. Even 5% a year, applied with discipline, takes a ₹1 crore outcome to roughly ₹1.37 crore in the example above.
WANT THIS RUN ON YOUR OWN NUMBERS
Your income, expenses and goals are different from this example. If you want the SIP amount, step up rate and fund categories mapped to your own numbers, a 30 minute session does exactly that.
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FREQUENTLY ASKED QUESTIONS
A step up SIP is a SIP whose monthly amount rises automatically by a fixed percentage or a fixed rupee amount at set intervals, usually once a year. A ₹10,000 SIP with a 10% annual step up becomes ₹11,000 in year two, ₹12,100 in year three, and so on.
In this example, a ₹10,000 SIP for 20 years at an assumed 12% return grows to about ₹99,91,479 if kept flat and about ₹1,98,88,715 with a 10% annual step up. That is about ₹98,97,236 more, for about ₹44,73,000 of additional money invested.
Choose a percentage close to your expected annual income growth. For most salaried people that is 5 to 10%. A smaller step you actually keep is better than a larger one you cancel in a bad year.
Many fund houses and investment platforms offer a step up or top up facility, either while starting the SIP or by editing it later. The exact steps differ by platform, so check the options on the one you use.
12% a year is an illustrative long term assumption for diversified Indian equity funds, not a promise. Real returns vary every year and can be negative. The comparison between flat and step up holds at other assumptions: at 8% the step up plan is about 2.2 times the flat plan, and at 15% about 1.8 times.
Both help, and they are not exclusive. In the example above, a flat ₹10,000 SIP that starts five years earlier grows to about ₹1.90 crore over 25 years, close to the ₹1.99 crore from a 20 year step up SIP. If you cannot go back in time, stepping up is the lever you can still pull.
Use a smaller percentage or a fixed rupee step, for example ₹500 or ₹1,000 a year, or skip the raise for that year. Pausing the raise is much better than stopping the SIP.
It depends on the loan rate against the return you can reasonably expect. We compared them in detail in our guide on prepaying a home loan versus investing, which shows the break even rate.
No. The fund and its risk stay the same. Only the amount you invest each month changes. A step up SIP in a risky fund is still a risky investment.
Each instalment is treated as a separate purchase with its own holding period. For equity mutual funds, gains on units held more than 12 months are taxed at 12.5% on the amount above ₹1.25 lakh in a financial year, and gains on units sold within 12 months are taxed at 20%, plus 4% cess, under the rates applicable as of FY 2026 27. Check the current rules before you sell.
AS
Abhyudaya Vikram Singh
AMFI Registered Mutual Fund Distributor (EUIN: E420092). Writes DhanSutra to explain money decisions with real numbers. Try the free financial calculators to run your own.
Projections in this article are illustrative, based on a 12% annual return assumption with monthly compounding, and are not guaranteed returns. Abhyudaya Vikram Singh is an AMFI-Registered Mutual Fund Distributor (EUIN: E420092), not a SEBI-Registered Investment Adviser. All content on DhanSutra is for educational purposes only and is not investment advice. Mutual fund investments are subject to market risks; read all scheme-related documents carefully.
If this changed how you think about your SIP amount, share it with one person who set a SIP five years ago and never touched it. Every DhanSutra article shows its numbers so you can check them yourself.
