You know you should be investing for retirement. You know SIPs are a good idea. But the question that actually keeps you up at night is: how much? How much per month do I need to invest so that I can retire comfortably — whether that’s retiring in India, staying abroad, or something in between?
This blog does the maths for you. No vague advice. No “start as early as possible” platitudes without numbers. Just real compounding calculations across different time horizons, amounts, and strategies — so you can find the scenario that fits your life and start building toward it.
Step 1: What's Your Retirement Number?
Before calculating the SIP, you need a target. The most practical framework: the 25x rule. Take your expected monthly expenses at retirement, multiply by 12 (annual), multiply by 25. That’s your retirement corpus — the amount that, invested conservatively at 4% annual withdrawal, should last 25–30 years.
But here’s the catch most calculators miss: inflation changes everything. Your expenses at retirement will be much higher than today because of inflation.
At 6% inflation (India’s long-term average), today’s ₹50,000 per month becomes approximately ₹1.60 lakh per month in 20 years. Apply the 25x rule: ₹1.60 lakh × 12 × 25 = approximately ₹4.8 crore.
That’s the number for someone spending ₹50,000 per month today with 20 years to retirement. Not ₹1 crore. Not ₹2 crore. Nearly ₹5 crore.
If your current expenses are ₹75,000 per month with 20 years to go, the corpus target is approximately ₹7.2 crore. At ₹1 lakh per month with 15 years to go, it’s approximately ₹7.2 crore as well.
These numbers can feel intimidating. But that’s exactly why compounding exists — and why starting now matters more than starting big.
Step 2: What Does the SIP Need to Look Like?
Now let’s reverse-engineer. Using 12% CAGR (the long-term average for Indian equity mutual funds, subject to market risks), here’s what different SIP amounts grow to:
At ₹25,000 per month
Invest for 10 years: your ₹30 lakh invested becomes approximately ₹58 lakh. Invest for 15 years: your ₹45 lakh invested becomes approximately ₹1.26 crore. Invest for 20 years: your ₹60 lakh invested becomes approximately ₹2.50 crore. Invest for 25 years: your ₹75 lakh invested becomes approximately ₹4.74 crore.
At ₹50,000 per month
Invest for 15 years: your ₹90 lakh invested becomes approximately ₹2.52 crore. Invest for 20 years: your ₹1.20 crore invested becomes approximately ₹5.0 crore.
At ₹15,000 per month
Invest for 20 years: your ₹36 lakh invested becomes approximately ₹1.50 crore. Invest for 25 years: your ₹45 lakh invested becomes approximately ₹2.85 crore.
Look at the 20-year and 25-year numbers. That’s where compounding gets serious. A ₹25,000 SIP for 25 years produces ₹4.74 crore from ₹75 lakh invested — the remaining ₹3.99 crore is pure compounding. Almost 85% of the final corpus is money your money earned, not money you put in.
For SIP mechanics, mandate setup, and tax nuances on each instalment, see our SIP guide for NRIs.
Step 3: The Step-Up Strategy That Changes Everything
A flat SIP of ₹25,000 per month for 20 years is powerful. But most NRIs get salary increases, bonuses, and career progression over two decades. A step-up SIP — increasing your SIP amount by a fixed percentage each year — harnesses that income growth.
₹15,000 per month with 10% annual step-up for 20 years
You start at ₹15,000, increase by 10% each year (₹16,500 in year 2, ₹18,150 in year 3, and so on). Total invested: approximately ₹1.03 crore. Corpus at 12% CAGR: approximately ₹2.98 crore.
Compare that to a flat ₹15,000 SIP for 20 years: total invested ₹36 lakh, corpus ₹1.50 crore. The step-up nearly doubles the corpus by investing more as your income grows.
₹25,000 per month with 10% annual step-up for 20 years
Total invested: approximately ₹1.72 crore. Corpus at 12% CAGR: approximately ₹4.97 crore.
That ₹4.97 crore hits the ₹4.8 crore target for someone spending ₹50,000 per month today. One SIP strategy, starting at ₹25,000 per month, stepping up 10% annually, for 20 years — that’s a retirement plan.
Step-up SIPs are particularly powerful for NRIs because your overseas salary typically grows faster than Indian inflation. A 10% annual step-up is conservative for most NRIs earning in USD, GBP, AED, or AUD.
The NRI Retirement Question: Where Will You Retire?
Your retirement number depends heavily on where you plan to spend your retirement years. This decision determines the currency of your expenses and the corpus you need.
Returning to India
Your expenses will be in rupees. A ₹5 crore corpus generating 4% annually gives you ₹20 lakh per year (approximately ₹1.67 lakh per month) — a very comfortable retirement in most Indian cities. Your entire SIP corpus is already in rupees. No currency conversion needed. This is the simplest scenario. For allocation by life intent, see how much NRIs should invest in India.
Staying abroad
Your expenses will be in your home currency. A ₹5 crore corpus is approximately £420,000 or USD 590,000 at current rates — meaningful but not a full retirement in London or New York. In this case, your India SIP is one component of your retirement portfolio alongside home-country pensions, superannuation (Australia), 401(k) (US), or workplace pensions (UK). India handles the growth component; your home country handles the base.
Splitting time
Many NRIs envision 6 months in India, 6 months abroad. You need a corpus that serves both currencies. The India SIP covers the India portion. Home-country savings cover the rest.
Regardless of where you retire, the India SIP component works the same way — the maths doesn’t change with geography. What changes is how much of your total retirement plan the India SIP represents.
Why Most NRIs Undershoot — And How to Avoid It
Three patterns we see repeatedly.
The “I’ll start when I go back” trap. An NRI who delays SIP by 5 years from age 35 to 40 doesn’t lose 5 years of contributions — they lose the compounding on those 5 years. A ₹25,000 SIP starting at 35 (25 years to retire at 60) produces ₹4.74 crore. Starting at 40 (20 years) produces ₹2.50 crore. The 5-year delay costs ₹2.24 crore — money that was never invested, never compounded, and can never be recovered.
The FD-only approach. NRE FDs at 6.50–7.25% are excellent for short-term goals and stability. But for a 20-year retirement goal, the compounding gap is enormous. ₹25,000 per month for 20 years at 7% (FD-like return) produces approximately ₹1.31 crore. At 12% (equity), the same SIP produces ₹2.50 crore. That’s ₹1.19 crore left on the table — the cost of choosing only fixed deposits for a long-term goal.
Not stepping up. Your salary grows. Your SIP should too. A flat ₹25,000 SIP for 20 years at 12% produces ₹2.50 crore. The same SIP with 10% annual step-up produces ₹4.97 crore. The step-up costs you nothing extra today — you increase only as your income grows.
Which Funds for a Retirement SIP?
Your retirement SIP doesn’t need exotic strategies. For a 15–20 year horizon, a simple portfolio works:
60–70% in diversified equity — flexi cap or large cap funds that grow with India’s economy. These are the growth engines of your retirement corpus.
20–30% in a Nifty 50 index fund — transparent, low-maintenance, and correlated with India’s long-term growth story. Nifty 50 has delivered 11–12% CAGR over 20–25 year periods historically (subject to market risks).
10–20% in stability — hybrid or balanced advantage funds that reduce volatility as you approach retirement.
As you get closer to retirement (5–7 years out), gradually shift from equity-heavy to stability-heavy. This isn’t something you need to do actively from abroad — it’s part of what an ongoing portfolio review handles. For fund category details, see our best mutual funds for NRIs guide.
Your Retirement SIP Cheat Sheet
Here’s a quick reference. Find your current age and target retirement at 60. All numbers assume 12% CAGR (subject to market risks).
Age 30 (30 years to retirement)
₹15,000 flat SIP → ₹5.3 crore. ₹25,000 flat SIP → ₹8.8 crore. You have time on your side. Even modest amounts compound massively over 30 years.
Age 35 (25 years to retirement)
₹25,000 flat SIP → ₹4.74 crore. ₹25,000 with 10% step-up → ₹7.5+ crore. The sweet spot — enough time for serious compounding, but the step-up makes a big difference.
Age 40 (20 years to retirement)
₹25,000 flat SIP → ₹2.50 crore. ₹50,000 flat SIP → ₹5.0 crore. ₹25,000 with 10% step-up → ₹4.97 crore. Start higher or commit to stepping up — compounding has less runway.
Age 45 (15 years to retirement)
₹50,000 flat SIP → ₹2.52 crore. ₹25,000 with 10% step-up → ₹2.17 crore. At this point, lump sum deployment alongside SIP becomes important to boost the corpus. Time is shorter, so deployed capital matters more.
The Only Step That Matters
Every NRI reading this already knows that compounding works. The difference between NRIs who retire comfortably and those who don’t isn’t knowledge — it’s whether they started.
The setup is straightforward: NRE account, PAN, KYC, fund selection, SIP mandate. A one-time process that takes a few weeks. After that, the SIP runs automatically every month. You review it annually. The Indian economy and compounding do the rest.
Our team works with NRIs across the US, UK, UAE, Canada, Australia, and Singapore to build retirement-focused India portfolios. We handle the setup, fund selection, step-up scheduling, and ongoing reviews — so your retirement corpus builds while you focus on your career.
Frequently Asked Questions
How much SIP do NRIs need per month for retirement?
It depends on your target corpus, time horizon, and expected returns. As a reference: a ₹25,000 monthly SIP at 12% CAGR for 20 years grows to approximately ₹2.50 crore. For 25 years, the same SIP grows to approximately ₹4.74 crore. A 10% annual step-up dramatically increases the final corpus. Use the 25x rule (25 times your inflation-adjusted annual expenses at retirement) to determine your target, then work backwards to the required SIP amount. Past returns are not guaranteed and mutual fund investments are subject to market risks.
What is the 25x rule for retirement planning?
The 25x rule says your retirement corpus should be 25 times your expected annual expenses at retirement. At a 4% annual withdrawal rate, this corpus should last 25–30 years. Critically, you must inflation-adjust your current expenses: at 6% inflation, ₹50,000 per month today becomes approximately ₹1.60 lakh per month in 20 years, giving a corpus target of approximately ₹4.8 crore — not the ₹1.5 crore you might estimate using today’s expenses.
What is a step-up SIP and why does it matter for NRI retirement planning?
A step-up SIP increases your monthly investment by a fixed percentage each year — typically 10%. You start at ₹15,000 per month, then ₹16,500 in year 2, ₹18,150 in year 3, and so on. Over 20 years at 12% CAGR, a step-up SIP starting at ₹15,000 produces approximately ₹2.98 crore — nearly double the ₹1.50 crore from a flat ₹15,000 SIP. For NRIs whose overseas salaries grow faster than Indian inflation, a 10% annual step-up is conservative and dramatically improves retirement outcomes.
Should NRIs build their entire retirement corpus in India?
Not necessarily. If you plan to retire in India, building the bulk of your corpus in rupees through Indian equity mutual funds makes sense — your expenses will be in rupees. If you’re staying abroad, your India SIP is the growth component of a broader retirement portfolio that includes home-country pensions, superannuation, or 401(k). Even NRIs staying abroad benefit from India’s higher equity returns (12–15% historical CAGR) as a growth engine alongside their home-country retirement savings.
How much does delaying a SIP by 5 years cost?
Significantly more than most NRIs realise. A ₹25,000 monthly SIP starting at age 35 (25 years to retirement at 60) produces approximately ₹4.74 crore at 12% CAGR. Starting the same SIP at age 40 (20 years) produces approximately ₹2.50 crore. The 5-year delay costs ₹2.24 crore — because you lose the compounding on those early contributions, not just the contributions themselves. This is why starting now matters more than starting with a large amount.
Disclaimer: This blog is for informational purposes only and does not constitute financial, legal, or tax advice. All compounding illustrations use assumed rates of return (12% CAGR for equity mutual funds, 7% for fixed deposits, 6% inflation) based on historical data. Past performance does not guarantee future results. Actual returns will vary based on market conditions, fund selection, and economic factors. Mutual fund investments are subject to market risks — read all scheme-related documents carefully. The 25x rule and 4% withdrawal rate are general frameworks, not personalised recommendations. Consult a qualified financial advisor before making retirement planning decisions specific to your circumstances.
