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Tools / Retirement corpus & pension planner

Retirement corpus & pension planner

Comprehensive retirement planning engine. Projects required post-retirement corpus based on living expenses, pre and post-retirement inflation rates, required monthly investment SIPs, and 4% rule FIRE numbers.

Runs entirely in your browser

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About this tool

Planning for retirement means answering two questions: how large a corpus you will need to fund your expenses after you stop working, and how much you must invest each month to get there. This planner estimates both, projecting your target corpus from your expected living expenses and inflation (before and after retirement), and calculating the monthly SIP required to reach it — along with your 4% rule FIRE number.

Inflation is the factor most back-of-envelope plans miss: expenses that seem manageable today grow substantially over decades, so the corpus needed is larger than intuition suggests. Modelling pre- and post-retirement inflation separately gives a more realistic target than a single flat assumption.

It runs in your browser, so your figures stay private. All projections rest on assumptions about returns and inflation that will not hold exactly, so use it to set a direction and revisit it periodically rather than as a fixed guarantee.

Frequently asked questions

How much do I need to retire?
Enough to fund your post-retirement expenses, adjusted for inflation, for the rest of your life. The planner estimates that target corpus from your expenses and inflation assumptions.
What is the 4% rule?
A guideline that you can withdraw about 4% of your retirement corpus in the first year (adjusting for inflation thereafter) with a reasonable chance it lasts. It implies a corpus of roughly 25 times annual expenses.
Why does inflation matter so much?
Over decades, inflation greatly increases future expenses, so the corpus you need is much larger than today’s costs suggest. The planner models it before and after retirement.
Are my figures private?
Yes. The calculation runs in your browser, so nothing you enter is uploaded.

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