How Much Money Do You Need to Retire? Inflation‑Adjusted Corpus

Guides · Investing · Updated 2026

Retirement planning often starts with a single intimidating question: how big does my corpus need to be? A popular rule of thumb from the FIRE movement says you need 25 times your annual expenses invested to retire comfortably. But that number must be adjusted for inflation — what costs ₹50,000 a month today could cost ₹2.5 lakh a month in 30 years. This guide explains the 25x rule, shows you how to calculate an inflation‑adjusted retirement corpus with a worked example, and introduces our free calculator that does the heavy lifting.

Why 25x Is a Starting Point, Not a Final Number

The 25x rule is based on the "4% safe withdrawal rate" — if you withdraw 4% of your corpus in year one and adjust for inflation annually, your money should last at least 30 years. But this rule was developed for US markets with specific return assumptions. In India, where inflation averages 5–7% and equity returns can be volatile, a 30–35x multiplier is often more prudent for early retirement. Also, your expenses in retirement may not be uniform: travel and healthcare costs spike in the early and late phases respectively.

25x corpus = 4% withdrawal rate; 33x = 3% withdrawal (more conservative).
Inflation reduces purchasing power: a ₹10,000 expense today becomes ~₹43,000 in 20 years at 6% inflation.
Don't forget to factor in a paid‑off home, emergency fund, and health insurance.

Step-by-step: Calculate Your Retirement Corpus

Open the Retirement Corpus Calculator tool.
Enter your current monthly expenses, current age, expected retirement age, and life expectancy (e.g., 85).
Set an inflation rate (6–7% typical for India) and expected post‑retirement return on investments.
The tool calculates the corpus needed at retirement to sustain inflation‑adjusted withdrawals for your expected lifespan. It also shows the monthly SIP required to get there.

💡 Tip: Re‑run this calculation every 3–4 years. As your income grows, so do your lifestyle and expenses. A corpus that looked sufficient at 30 may fall short at 40 if you don't adjust.

Worked Example: Retirement at 55 with 6% Inflation

      Assumptions: Current age 35, retire at 55, life expectancy 85. Monthly expenses today ₹50,000. Inflation 6%, post‑retirement return 8%.

      Step 1: Expenses at retirement (20 years later) = ₹50,000 × (1.06)^20 ≈ ₹1,60,357/month.

      Step 2: Annual expenses at retirement ≈ ₹19,24,284.

      Step 3: Apply 25x FIRE rule → Corpus ≈ ₹19,24,284 × 25 = ₹4.81 crore.

      (Using 30x for extra safety → ₹5.77 crore)

      The tool also works backwards: to accumulate ₹4.81 crore in 20 years at 12% equity return, you'd need to invest roughly ₹55,000/month via SIP.

Use the SIP Calculator to verify the monthly contribution needed, and the Step‑Up SIP Calculator to see how increasing contributions annually can shrink the time or boost the final amount.

Frequently Asked Questions

Is 25x enough if I retire early at 40?

For a 40‑year retirement, 25x is risky. Consider 33x–40x to reduce the chance of running out of money. The calculator lets you test different multipliers.

Should I include my house value in the corpus?

No, your primary residence isn't liquid. Only include investments you can actually draw income from — mutual funds, FDs, EPF, NPS, etc.

How does the National Pension System (NPS) fit in?

NPS provides a partial lump sum and an annuity. Our NPS Calculator can help you estimate that retirement income stream separately.

What if I outlive my corpus?

A conservative withdrawal rate and a buffer (2–3 extra years of expenses) are key. Annuities can provide longevity insurance, albeit with lower returns.

Is it free and private?

Yes — the tool runs entirely in your browser, free, with no sign‑up and nothing uploaded to a server.

Try the Retirement Corpus Calculator