Retirement Planner Calculator with Inflation and Step-Up Investment

📘 About the Retirement Planner

The Retirement Planner Calculator estimates whether your current savings and growing monthly investments may be sufficient for retirement.

Your monthly investment increases once every year by the annual investment increase percentage.

Your current expenses are increased by the selected inflation rate until retirement so that the retirement calculation is based on future purchasing power rather than today's expenses.

After retirement, expenses are assumed to continue increasing with inflation throughout the retirement period.

🧮 Formula

Growing investment

Step-up SIP = starting monthly investment with annual percentage increases

Inflation-adjusted expense

Future expense = Current expense × (1 + inflation)^years

Projected retirement corpus

Projected corpus = Future value of current savings + Future value of step-up investments

Required retirement corpus

Required corpus = Present value of retirement expenses that increase with inflation

Where

Years to retirement = Retirement age − Current age
Monthly investment increases once every 12 months
Current savings grow until retirement at the expected pre-retirement return
Monthly expense at retirement = Current monthly expense × (1 + inflation)^years to retirement
Retirement expenses increase with inflation after retirement
Required corpus is the present value at retirement of the inflation-adjusted retirement expenses

The investment projection follows an annual step-up SIP model with monthly compounding. The required corpus assumes annual retirement expenses increase with inflation and the remaining corpus earns the expected post-retirement return.

✏️ Worked examples

15-year retirement plan

You enter
Current Age	36 yrs
Retirement Age	51 yrs
Life Expectancy	85 yrs
Current Monthly Expense	₹50,000
Current Retirement Savings	₹1,000,000
Current Monthly Investment	₹20,000
Annual Increase in Investment	5%
Expected Inflation	6%
Expected Pre-Retirement Return	10%
Expected Post-Retirement Return	8%

You get
Years to Retirement	15
Monthly Expense at Retirement	₹119,827.91
Monthly Investment at Retirement	₹41,578.56
Future Value of Investments	₹10,999,861.59
Future Value of Current Savings	₹4,177,248.17
Projected Corpus at Retirement	₹15,177,109.76
Required Retirement Corpus	₹33,816,392.74
🟢 Surplus / 🔴 Shortfall	₹-18,639,282.99
Additional Monthly Investment Needed	₹33,890.03

The monthly investment increases every year while expenses are adjusted for inflation.

Try this example →

Step-up SIP example

You enter
Current Age	30 yrs
Retirement Age	45 yrs
Life Expectancy	80 yrs
Current Monthly Expense	₹50,000
Current Retirement Savings	₹0
Current Monthly Investment	₹10,000
Annual Increase in Investment	10%
Expected Inflation	6%
Expected Pre-Retirement Return	12%
Expected Post-Retirement Return	8%

You get
Years to Retirement	15
Monthly Expense at Retirement	₹119,827.91
Monthly Investment at Retirement	₹41,772.48
Future Value of Investments	₹8,683,849.43
Future Value of Current Savings	₹0.00
Projected Corpus at Retirement	₹8,683,849.43
Required Retirement Corpus	₹34,521,584.47
🟢 Surplus / 🔴 Shortfall	₹-25,837,735.04
Additional Monthly Investment Needed	₹29,753.78

A ₹10,000 monthly investment with a 10% annual increase and 12% expected return for 15 years produces approximately ₹86.84 lakh under the monthly-compounding step-up model.

Try this example →

🧭 How to use this calculator

What you enter

Current Age (yrs)
Retirement Age (yrs)
Life Expectancy (yrs)
Current Monthly Expense (₹)
Current Retirement Savings (₹)
Current Monthly Investment (₹)
Annual Increase in Investment (%)Your monthly investment increases by this percentage once every year.
Expected Inflation (%)
Expected Pre-Retirement Return (%)
Expected Post-Retirement Return (%)

What you get

Years to Retirement
Monthly Expense at Retirement
Monthly Investment at Retirement
Future Value of Investments
Future Value of Current Savings
Projected Corpus at Retirement
Required Retirement Corpus
🟢 Surplus / 🔴 Shortfall
Additional Monthly Investment Needed

💡 How the investment projection works

The starting monthly investment is used for the first year.
At the beginning of each new year, the monthly investment increases by the selected annual increase percentage.
Each monthly investment is compounded at the expected monthly return.
Current savings are separately compounded until retirement.

💡 How inflation is handled

Inflation increases your current monthly expense until your retirement date.
The resulting retirement expense is used as the first-year retirement spending level.
Retirement spending then increases every year by the same inflation rate.
This prevents the calculation from assuming that a fixed nominal expense will remain sufficient throughout retirement.

💡 Important assumptions

Returns are assumed to remain constant for projection purposes.
The investment increase occurs once per year.
The calculation is an estimate and actual investment returns can vary.
Taxes, investment costs and sequence-of-returns risk are not separately modelled.

❓ Frequently asked questions

Does the calculator increase my investment every year?

Yes. The annual investment increase is applied once every 12 months to the monthly investment.

Does inflation increase my expenses before retirement?

Yes. Your current monthly expense is increased by the selected inflation rate for every year until retirement.

Does inflation continue after retirement?

Yes. Retirement expenses are assumed to increase every year after retirement, so the required corpus accounts for rising expenses.

Why can the result differ from a normal SIP calculator?

A normal SIP calculator usually assumes a fixed monthly investment. This calculator uses an annual step-up, so the monthly investment becomes larger every year.

Is the projected corpus guaranteed?

No. It is a mathematical projection based on the return, inflation and investment assumptions entered by the user.

🏖️ Retirement Planner Calculator

Enter details