Retirement Corpus Calculator

Retirement planning is not about hitting an arbitrary round figure like ₹1 Crore or ₹5 Crore. It is about calculating the exact capital necessary to sustain your monthly household lifestyle throughout your post-working years, fully accounting for the compounding erosion of purchasing power caused by inflation.

The FinToolkit Retirement Corpus Calculator works backwards from your current living expenses to determine: (1) what your monthly expenses will be when you stop working, (2) the total corpus needed at retirement to fund 20 to 30 years of living costs, and (3) the exact monthly SIP required today to achieve that goal.

How the retirement corpus equation works

Building an accurate retirement plan requires modeling three phases:

1. Inflation-adjusted expense at retirement: Compounding your current living expenses forward to your retirement age using an inflation assumption (typically 6% to 7% in India):
   Future Monthly Expense = Current Expense × (1 + Inflation)^{(Retire Age − Current Age)}
2. Post-retirement corpus sizing: Calculating the present value of an inflation-growing annuity across your life expectancy, using a post-retirement real rate of return:
   Real Return = [ (1 + Post-Retire Return) / (1 + Inflation) ] − 1
3. Monthly savings requirement: Calculating the monthly SIP needed from now until retirement age, assuming pre-retirement compounding on equity and debt assets.

Worked retirement calculation example

Consider a 30-year-old individual currently spending ₹50,000 per month on living expenses, planning to retire at age 60 with a life expectancy of 85 years (a 25-year retirement phase). Assume 6% inflation, a pre-retirement investment return of 12% p.a., and a conservative post-retirement return of 7% p.a.

Because of 6% inflation, living costs of ₹50,000 today grow to ₹2.87 Lakh per month by age 60. Funding 25 years of escalating expenses requires a target corpus of ₹7.71 Crore. To achieve this, the individual must commit ₹21,856 per month into a disciplined 12% equity SIP starting today.

Managing key retirement risks

• Longevity risk: Living longer than expected can exhaust your capital. Planning for a life expectancy of at least 85 to 90 years provides a safety margin.
• Healthcare inflation drag: Medical costs in India historically inflate at 12% to 14% annually. Maintaining dedicated senior citizen health insurance protects your core retirement corpus from being liquidated for hospital bills.
• Asset allocation shift: As retirement approaches, gradually shift capital from volatile equities to high-quality debt instruments and hybrid funds to protect your accumulated wealth from market corrections right before retirement.

Frequently asked questions

Why is the required retirement corpus so large?

Inflation causes living expenses to multiply significantly over 30 years. What costs ₹50,000 today requires ₹2.87 Lakh per month at age 60, and your corpus must continue to fund those escalating expenses for another 25 to 30 years without fresh salary income.

What if I cannot afford the required monthly SIP today?

Start with whatever amount your budget permits and increase your monthly contribution by 5% to 10% each year as your income grows, using a Step-Up SIP. Annual step-ups dramatically close the gap over time.

Should my post-retirement portfolio stay 100% in fixed deposits?

No. Fixed deposits alone fail to beat inflation after accounting for income tax. A balanced retirement portfolio typically keeps 20% to 30% in equity or hybrid mutual funds to provide capital growth, while the remaining 70% to 80% stays in safe debt instruments to fund near-term monthly cash flow.

How does my EPF and NPS balance factor into this corpus?

Your accumulated balances in EPF and NPS count directly toward your target retirement corpus. Subtract your projected EPF and NPS maturity values from the required target to determine the net shortfall your personal SIPs need to cover.

Related retirement & planning tools

• Step-Up SIP Calculator — model how annual salary increments make large retirement targets achievable.
• EPF Calculator — project your mandatory provident fund accumulation at retirement age.
• NPS Calculator — estimate your pension and lump-sum proceeds from the National Pension System.
• Inflation Calculator — visualize how rising prices erode purchasing power over multi-decade horizons.