What a systematic withdrawal plan does
An SWP is a standing instruction to redeem a fixed rupee amount from a mutual fund on a set date each month. The money you have not withdrawn stays invested and keeps earning. It is the mechanism most often used to turn a retirement corpus into a monthly income.
Two forces pull against each other. Your withdrawals shrink the balance; the return on what remains grows it. Which one wins decides whether the corpus lasts.
The arithmetic of lasting
Each month the calculator does the same two steps: subtract the withdrawal, then apply one month of return to what is left.
The threshold is easy to state. If your annual withdrawal is smaller than the annual return on the balance, the corpus grows even while you draw from it. If it is larger, the balance falls, and it falls faster each year because the base earning the return keeps shrinking.
A worked case. ₹50,00,000 earning 8% produces about ₹4,00,000 a year, or roughly ₹33,000 a month. Withdraw ₹30,000 a month and the corpus still grows slowly. Withdraw ₹50,000 and it is in decline from the first month, and the decline accelerates.
The calculator above will tell you the month the money runs out, if it does.
Why an SWP is often preferred to a dividend payout
- You control the amount. A fund's payout is whatever the fund decides. An SWP is whatever you instructed.
- The timing is predictable. The same date every month, which is what a monthly budget needs.
- Tax treatment is usually kinder. An SWP redemption is a capital gains event, and only the gain portion of each withdrawal is taxable — not the whole amount. A dividend, by contrast, is added to your income and taxed at your slab rate.
How to use this calculator
- Enter the total investment — the corpus you are starting with.
- Enter the withdrawal per month you need.
- Set the expected return rate on the invested balance. For money you are actively drawing down, a conservative figure is appropriate; this is not the place for an aggressive equity assumption.
- Set the time period you need the income to cover.
If the result warns you the corpus runs out, there are only three levers: withdraw less, start with more, or accept a shorter period.
Choosing a withdrawal rate
A common rule of thumb is to withdraw no more than 4% of the starting corpus a year and raise it with inflation. On ₹1 crore that is about ₹33,000 a month to begin with. The rule is a starting point, not a law — it depends on the return you actually earn, how long you need the income, and whether you can cut back in a bad year.
Note that this calculator holds the withdrawal constant. Real expenses rise with inflation, so a plan that looks comfortable at today's withdrawal may not be comfortable in year fifteen. Re-run it periodically with the figure you are actually taking.
What it does not model
- Inflation on the withdrawal. The monthly amount stays flat throughout.
- Capital gains tax on each redemption, which reduces what reaches your account.
- Sequence of returns. A poor few years at the start of a drawdown does disproportionate damage, because you are selling units cheaply to fund withdrawals. A constant rate hides this entirely, and it is the single biggest risk to a real SWP.
- Exit load on redemptions made soon after investing.