Retirement Pension Calculator (Monthly Income Goal)

How the retirement corpus is worked out

This calculator runs two steps. First it finds the corpus — the lump sum you need at retirement to pay your target income for as long as you will need it. It treats the income as an annuity and discounts it at your expected return, so the pot is drawn down to zero over the retirement years. Second, it works out the monthly saving that, invested at the same return, grows into that corpus by your retirement date. The projection table shows how the pot builds year by year.

Why the corpus is less than income × years

If you need ₹6,00,000 a year for 25 years, you might expect to need ₹1.5 crore — but the corpus is lower, because the money you have not yet withdrawn keeps earning a return during retirement. That growth funds part of your income, so you need less upfront. The higher the return you assume, the smaller the corpus required — and the more sensitive the plan is to that assumption.

The power of starting early

The monthly saving depends heavily on how many years you have. Because contributions compound, starting ten years earlier can roughly halve the amount you must set aside each month for the same goal. If the monthly saving looks unaffordable, the two most effective levers are more years (start now) and a realistic return from long-term, diversified investing.

A note on inflation

The income target here is in today’s rupees. Over decades, inflation erodes purchasing power, so ₹50,000 a month will buy less in 25 years. To plan in real terms, either raise your target income to a future-equivalent figure, or use an expected return that is net of inflation (your real return). Treat the result as a well-structured estimate, not a guarantee.

Tips to hit your number

• Automate the monthly saving so it happens before you spend.
• Increase it with every raise — even 5% more a year compounds enormously.
• Keep costs low and stay invested through market ups and downs.
• Revisit yearly and adjust the target, return and horizon as life changes.

Glossary

• Corpus: the retirement lump sum you accumulate.
• Annuity: a stream of equal payments (your retirement income).
• Accumulation: the saving phase before retirement.
• Drawdown: spending the corpus during retirement.

How much income will you need?

A common starting point is the replacement ratio — the share of your pre-retirement income you will need afterwards, frequently estimated at 70–80%. Your own figure depends on whether your home is paid off, your health, lifestyle and any other pensions. Set the monthly income target here to the amount you actually expect to spend, remembering that some costs fall in retirement (commuting, saving itself) while others, especially healthcare, tend to rise. It is safer to slightly overestimate the income you will want than to fall short decades from now.

Sequence-of-returns risk

Two retirees with the same average return can end up very differently off depending on when good and bad years fall. A run of poor returns in the first few years of retirement — while you are drawing income — can permanently shrink the pot, because there is less capital left to recover when markets rebound. This is sequence-of-returns risk. Common defences include holding a cash buffer of a year or two of spending, being flexible with withdrawals in bad years, and using a slightly more conservative return assumption for the retirement phase than for the saving phase.

How this fits with EPF, NPS and pensions

Most people build their corpus from several sources — an employer pension, provident-fund schemes like EPF, a national pension such as NPS, and personal investments. Treat the corpus this calculator produces as your total target, then subtract what your existing schemes are on track to provide; the remainder is what your own monthly saving must cover. Reviewing this gap once a year, and topping up whenever your income rises, is the single most reliable way to stay on course.

Common retirement-planning mistakes

• Starting late: the biggest driver of the monthly saving is time — every year you wait raises the amount required.
• Ignoring inflation: planning in today’s rupees without adjusting can leave a real shortfall decades later.
• Assuming an unrealistic return: an optimistic rate makes the required saving look small and the plan fragile.
• Not revisiting the plan: income, goals and markets change — review the numbers here at least once a year and adjust.

Related calculators