How much corpus do I need to retire in India?

A common starting rule is 25-30 times your annual expenses at retirement, adjusted for inflation between now and then. For someone needing Rs 1 lakh/month in today's money retiring in 25 years, the actual corpus required — after inflating expenses — can be Rs 6-8 crore, far more than most quick calculators show.

Why do most retirement calculators show a lower number than reality?

Many calculators use optimistic post-retirement return assumptions, ignore inflation during the 20-30 year retirement phase itself, or don't account for rising healthcare costs. This understates the true corpus needed.

What return assumption should I use for retirement planning?

For the accumulation phase (working years), long-term equity-oriented assumptions of 10-12% are reasonable. For the withdrawal phase (post-retirement), a more conservative blended assumption of 7-9% is safer since capital preservation matters more than growth.

Retirement Corpus Calculator — The Honest Number

By Bhrugu Thakkar · Real Value (ARN 24454) · September 2026 · 8 min read

Short answer: Most online calculators quietly understate your number by ignoring inflation during retirement and using optimistic post-retirement returns. The honest corpus for a comfortable Indian retirement is usually 25–35 times your annual expenses at the retirement date — not today's expenses, and that date's number is much bigger than you think.

Type "retirement calculator" into any search engine and you'll get a number in seconds. The problem isn't the maths — it's the assumptions hidden inside. Change two or three inputs quietly and the "required corpus" can shrink by half. That's how people end up 60 years old with a fund that runs dry at 78, when they're likely to live to 88.

The three lies calculators tell (by omission, not intent)

Assumption	Common shortcut	Honest version
Inflation post-retirement	Ignored — expenses assumed flat	Applied every year for 25-30 years of retired life too
Post-retirement return	10-11% (equity-like)	7-9% (safer, blended portfolio)
Life expectancy	Plan to 75-80	Plan to 90 — running out of money at 82 is a real risk

Each of these individually looks like a small tweak. Together, they can make the difference between a corpus of Rs 3 crore and Rs 7 crore for the exact same lifestyle.

The honest step-by-step method

Start with today's monthly expenses — not income, actual spend. Say Rs 60,000/month, or Rs 7.2 lakh/year.
Inflate to your retirement date. If retirement is 25 years away and inflation runs at 6%, that Rs 7.2 lakh/year becomes roughly Rs 31 lakh/year in the year you retire.
Apply a withdrawal multiple, not a flat number. A commonly used range is 25-30x your first year's post-retirement expense, assuming the remaining corpus keeps growing at 7-9% while you withdraw and inflation continues eating into it.
Add a healthcare buffer. Medical inflation in India has historically run higher than general inflation. A separate health corpus or adequate insurance reduces the chance this derails the plan.

Using the example above: Rs 31 lakh/year × 27 (a mid-point multiple) ≈ Rs 8.4 crore corpus required at retirement. That's the honest number — not the Rs 2-3 crore a quick calculator might show using today's expenses without inflating them forward.

Why the gap is so large

The single biggest lever is inflating expenses to the retirement date before applying the multiple. Skipping this step — using today's Rs 7.2 lakh instead of the inflated Rs 31 lakh — is the most common and most damaging shortcut. It alone can understate the required corpus by 3-4x for someone 25 years from retirement.

Working backwards to a monthly SIP

Once you have the honest target corpus, work back to what you need to invest monthly, using a realistic accumulation-phase return (10-12% for equity-oriented long-term investing) and your actual years remaining. The earlier you start, the more the calculation leans on compounding instead of on your ability to save large amounts later. This is the same principle covered in our piece on the power of compounding through SIPs — starting 10 years earlier can roughly halve the monthly amount needed for the same corpus.

What to actually do with this number

Recalculate every 2-3 years — expenses, inflation assumptions, and life goals change.
Don't panic at the size of the number. Break it into a monthly SIP; it becomes manageable.
Keep the accumulation portfolio growth-oriented while young, and shift towards capital preservation as retirement approaches — the asset allocation should change, not just the amount.
Build a separate liquid/FD buffer for the first 2-3 years of retirement so a market downturn right after you stop working doesn't force you to sell equity at a bad time.

The honest verdict

A retirement calculator is only as honest as its inflation and return assumptions. Don't just trust the number a website spits out — check what it assumed for inflation during retirement, what return it used for the withdrawal phase, and what age it planned you to live to. If those three inputs look conservative and realistic, the number is worth trusting. If not, redo the maths with the honest assumptions above — even if the bigger number is uncomfortable to look at today.

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Mutual fund investments are subject to market risks. Read all scheme related documents carefully. Educational content, not personalised advice. Real Value — AMFI Registered Mutual Fund Distributor, ARN 24454.