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Personal finance · 16 min

Retirement: how much and how soon

Written and reviewed by Prashant Nandkishor Maheshwari (editorial review, 2026-10-18). Not yet checked by an independent subject specialist. How we review.

What you will learn

Estimate a retirement spending need in future money, understand withdrawal rates and uncertainty, and name the questions to ask about pension options.

Why it matters

Retirement is long, uncertain and easy to postpone. A simple estimate turns a vague worry into numbers you can plan around.

The ideas

Levels are a learning preference, not a credential. Switch any time.

Novice level

Retirement planning asks three questions: how much will I need each year, where will it come from, and how long will it need to last?

Prices rise over time, so spending a few decades from now will be higher in rupees than today, even if your lifestyle stays the same.

Nobody knows exactly how long they will live or how markets will behave, so plans use ranges and are reviewed often.

Basic level

Future yearly spending = today's yearly spending x (1 + inflation) ^ years.

A withdrawal rate is the share of your savings you take out each year. Rates around 3% to 4% are often discussed, but no single rate is safe for everyone. Lower rates last longer.

Corpus needed = future yearly spending / withdrawal rate.

Count other sources of income too, such as pensions and rental income, and subtract them from what savings must cover.

Advanced level

Model returns, inflation and spending as ranges and test bad sequences early in retirement, which hurt more than the same returns later.

Expert level

Longevity risk, health-care costs and annuitisation are real trade-offs. A guaranteed income can reduce the corpus needed but costs flexibility.

Professional level

Personal retirement projections and product recommendations are regulated advice in many jurisdictions. This lesson is education only.

Key terms

Corpus
The total savings available at retirement.
Withdrawal rate
The share of savings taken out each year.
Inflation
A general rise in prices.
Pension
Regular income paid in retirement from a scheme.

Worked example

Illustration only. Spending today is ₹6,00,000 a year and retirement is 25 years away with 6% inflation: 6,00,000 x 1.06^25 = about ₹25.75 lakh a year. At a 3.5% withdrawal rate the corpus would be 25.75 lakh / 0.035 = about ₹7.36 crore; at 4% it would be about ₹6.44 crore. Any pension income reduces what savings must cover.

Try it yourself

Write today's yearly essential spending and how many years remain. Compute the future figure with the inflation calculator, then divide by two or three withdrawal rates to see a range. Note which assumption you are least sure of.

Nothing you write here is collected. Use paper or the workbook.

Try it with numbers: Savings growth calculator · Inflation and future cost calculator.

Check yourself

A lower withdrawal rate means the corpus needed is...
Why use a range for retirement plans?

A common misunderstanding

'There is a single magic number.' Estimates depend on inflation, returns, lifespan and spending, all of which change.

Local context

Pension schemes, tax treatment and age rules differ. In India, examples include EPF, PPF and NPS, with rules published by EPFO, the government and PFRDA. Check current terms before relying on any scheme.

References and review

  • Bengen, W. P. (1994), 'Determining Withdrawal Rates Using Historical Data', Journal of Financial Planning 7(4).
  • Your country's pension regulator or government pension pages (in India, PFRDA and EPFO).

Author and editorial reviewer: Prashant Nandkishor Maheshwari, 2026-10-18. Independent specialist review is pending. Spotted a mistake? Tell us.

Suggested next step

Continue with 'Money and the mind: habits and biases'.