This SWP calculator is about sustainability, not just a withdrawal number
A withdrawal plan can look comfortable on paper and still fail early if the return assumption is too optimistic or the withdrawal amount is too aggressive. That is why a useful SWP page needs to show not just the monthly withdrawal, but also how long the corpus may last and what the depletion path looks like.
This page estimates corpus life under the monthly withdrawal, annual return, and optional inflation you enter. It is useful for retirement-income planning, temporary income bridges, and corpus-stress tests, but it is not a guarantee that the money will actually last that long in real markets.
What this page helps you decide
- Projects how long the corpus may last under the withdrawal and return assumptions entered on the page.
- Shows total withdrawn, approximate years lasted, and the remaining corpus at the end of the model.
- Lets you add inflation to withdrawals so you can test a more realistic spending path.
What this estimate leaves out
- It does not guarantee that a retirement corpus is sustainable in real life.
- It does not model taxes, product costs, or portfolio rebalancing decisions.
- It does not capture the full impact of bad early-market years beyond the current simplified depletion model.
Withdrawal sustainability and depletion logic
The page simulates monthly withdrawals from the starting corpus while applying the annual return assumption entered by the user. If inflation is added, the withdrawal amount rises over time, which shortens corpus life compared with a flat-withdrawal case.
This makes the tool useful for stress testing, but not for false precision. Real-life outcomes depend on sequence of returns, taxes, product structure, and spending changes. A sustainable-looking result here is still only a planning estimate.
Examples
Retirement income planning
- Starting corpus: ₹50,00,000
- Monthly withdrawal: ₹50,000
Use this to see whether the withdrawal level is even close to reasonable before you layer in pensions, annuities, or other retirement cash flows.
Temporary income bridge
- Need: Support expenses for a fixed number of years
- Focus: Years lasted and final corpus
This is useful when the corpus is not meant to last forever, but only to bridge a temporary phase such as semi-retirement or a business transition.
Aggressive withdrawal case
- Question: What happens if the monthly withdrawal is too high?
- What changes most: Corpus life drops sharply
This is the quickest way to show how a withdrawal rate that feels comfortable emotionally can still exhaust the corpus too early.
How to use this SWP Calculator
- Enter the starting corpus and the monthly withdrawal you want to test.
- Set the expected annual return and optional inflation on withdrawals.
- Read the years lasted, total withdrawn, final corpus, and depletion trend together before deciding whether the withdrawal rate looks sustainable.
Common mistakes
- Treating the return assumption as a dependable outcome instead of a scenario.
- Ignoring inflation when the withdrawal is meant to support real living costs over a long period.
- Reading the years-lasted result without thinking about sequence-of-return risk or taxes.
Edge cases and limitations
- A bad run of returns early in retirement can damage sustainability more than the smooth model suggests.
- Very high withdrawals can collapse the time horizon so quickly that the corpus trend is useful mainly as a warning, not as a fine-tuning tool.
Methodology and review basis
Built and reviewed by Atul Sharma • Last updated 2026-03-22
This page models monthly withdrawals against a steady annual return assumption, with optional inflation applied to the withdrawal path. It is designed for sustainability checks, not for guaranteeing retirement success.
Site-wide review standards live in the review methodology and sources policy.
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Questions that usually come up
- Does this guarantee the corpus will last that long?
- No. It is a planning estimate based on the return and inflation inputs you choose. Real market paths can be worse or better.
- Why does inflation matter so much?
- Because the same monthly amount may not cover future living costs. Adding inflation makes the withdrawal path more realistic for longer periods.
- What changes the answer most?
- The three biggest drivers are the starting corpus, the withdrawal amount, and the return assumption. Inflation can also materially shorten the horizon.
- Can I use this for retirement planning?
- Yes, as a first pass. But retirement planning should still consider taxes, pensions, annuities, asset allocation, and spending flexibility.
- Why can the result still be wrong if the math is correct?
- Because the model simplifies real markets into a steady return path. Sequence of returns, product costs, and life events can change the actual outcome substantially.