Is your retirement corpus calculation realistic?

Most retirement corpus calculators are wrong. Not by a little. By 30 to 50 percent. Many people who follow the standard 25-times-yearly-expenses rule retire and discover their corpus runs out 10 years too early.

The retirement corpus calculation you trust today probably misses three big costs and one big assumption. Once you adjust for them, the realistic number is usually much higher than the spreadsheet shows.

The popular myth: 25 times your yearly expenses is enough

The 4 percent rule says you can withdraw 4 percent of your retirement corpus every year and the money lasts 30 years. That works out to a corpus of 25 times your yearly expense.

This rule was developed by an American researcher in 1994 using US data, US inflation patterns, and US healthcare costs. It assumes you start retirement at 65 and live to 95.

For the average Indian or global investor today, the rule misses several realities.

Why the standard calculation fails

It underestimates lifestyle inflation

You assume your current monthly expense of, say, 60,000 rupees stays the same in real terms. It does not. Once you retire, you have more time. More time means more travel, more eating out, and more discretionary spending. Real-world data shows the first decade of retirement spending is often 15 to 25 percent higher than working-life spending.

It ignores medical inflation

Healthcare prices in most countries rise 2 to 3 percentage points faster than general inflation. A 50,000 rupee hospital procedure today might cost 250,000 in 25 years even if general prices only triple. Your corpus calculator that uses 6 percent inflation underestimates this category badly.

It assumes one bull market

The 4 percent rule was tested on US history, which had three of the longest bull markets ever. If your retirement begins right before a 5-year bear market and you keep withdrawing 4 percent, your corpus may be cut in half by year 6 and never recover. Researchers call this sequence-of-returns risk.

It ignores longer life spans

Indians retiring today at 60 have a real chance of living to 90. Couples retiring together face a roughly 60 percent probability that at least one partner reaches 90. The classic 30-year planning window is too short for many.

A 60-year-old couple with a 100,000 rupee monthly expense today needs roughly 6 to 7 crore rupees as a realistic corpus, not the 3 crore that the 25-times rule suggests.

The realistic numbers

Here is a more accurate planning grid. It assumes you retire at 60, want money to last till 90, and adjust for 7 percent inflation, 9 percent post-retirement returns, and 25 percent higher early-retirement spending.

Yes, the realistic numbers are nearly double. That is the gap most calculators hide from you.

The evidence: studies that adjust for India

Several Indian financial planners and SEBI-registered investment advisors have run Monte Carlo simulations on Indian inflation and equity return data. Their findings:

• The safe withdrawal rate for India is closer to 3 percent than 4 percent
• A 30-year retirement plan should assume the corpus exhausts in 27 years on the median, leaving a 3-year buffer
• Equity allocation under 40 percent in early retirement makes failure dramatically more likely

For methodology references, the Reserve Bank of India and pension regulator publish long-term return data at pfrda.org.in.

The verdict: is your calculation realistic?

Run this 60-second check.

1. Take your current monthly expense
2. Add 25 percent for retirement lifestyle uplift
3. Multiply by 12 to get yearly expense
4. Multiply by 33 (instead of 25) for a 3 percent safe withdrawal rate
5. Add 10 percent more for medical inflation buffer

That number is your realistic corpus target. If your current plan is more than 30 percent below it, your calculation is not realistic and you need to act.

What to do if your corpus target is too low

Increase your savings rate now

The simplest fix. Each extra percentage point of income saved in your 30s and 40s adds disproportionately to your corpus through compounding.

Delay retirement by 2 to 3 years

Working 3 extra years often grows the corpus by 25 to 35 percent because you continue to save and your investments keep compounding.

Buy an annuity for base expenses

Lock part of your corpus into a pension that covers food, rent, and utilities. The rest of the corpus can stay invested for growth and discretionary spending.

Plan a phased retirement

Earning even half your current income for 3 to 5 years post-60 dramatically reduces the corpus burden. Consulting, teaching, or part-time advisory work fits this model well.

Frequently asked questions

Why is the 4 percent rule no longer reliable?

It was based on US data from 1926 to 1994 and assumed a 30-year retirement. Today, longer life spans, higher healthcare inflation, and more volatile markets push the safe withdrawal rate down to around 3 percent.

How much should I have saved by age 50 for retirement?

Aim for 12 to 15 times your current yearly expense by age 50. That gives compounding enough room to reach the realistic 30-plus times target by age 60.

Can rental income replace a retirement corpus?

Partly. Rental income can cover base expenses but offers limited liquidity for medical emergencies. A balanced plan combines a financial corpus with rental cash flow rather than relying on rent alone.