SWP Calculator

SWP Calculator: plan withdrawals from a mutual fund corpus

A Systematic Withdrawal Plan (SWP) lets you turn a mutual fund investment into a monthly income stream. You specify a fixed monthly amount to withdraw; the fund house redeems enough units at each month’s NAV to pay it out, and the rest of your corpus stays invested. SWP is the standard way to create predictable income in retirement or during a career break.

The mechanics

Every month the calculator does two things:

1. Grows the corpus by one month’s worth of return: balance × (1 + r/12).
2. Subtracts the monthly withdrawal.

If the withdrawal is smaller than the monthly growth, the corpus actually increases over time. If the withdrawal exceeds the growth, the corpus shrinks and will eventually deplete. The calculator shows how many years the corpus lasts under your chosen settings.

Why SWP beats taking a big lump sum

Suppose you have ₹1 crore saved for retirement:

• Withdraw it all at once: you have ₹1 crore in the bank earning ~4% savings interest, and you burn it down to zero.
• SWP at 6%/year returns: you can withdraw ~₹65,000/month for 25+ years because the remaining corpus keeps earning.

The difference is substantial — up to 40-50% more total income over a typical retirement — because the money stays invested while you draw from it.

Choosing a sustainable withdrawal rate

Three numbers interact:

• Expected annual return (r) — moderate equity / debt mix: 7–9%.
• Monthly withdrawal (W) — what you need each month.
• Target years (N) — how long the corpus must last.

As a rule of thumb, if W × 12 < corpus × r, the corpus will last indefinitely (you are withdrawing less than the returns). If W × 12 ≈ corpus × r, the corpus lasts for a very long time but slowly shrinks in real terms due to inflation. If W × 12 > corpus × r, you will eventually run out — and the calculator shows exactly when.

SWP vs annuity

• Annuities (offered by insurance companies) guarantee a fixed monthly payout but typically at lower effective rates, and the payouts die with you.
• SWP from mutual funds is market-linked: upside when markets do well, downside when they do not. You retain control of the underlying corpus and can adjust the withdrawal amount any month.

Most retirees benefit from a hybrid approach: some annuity for baseline security, SWP for the bulk of retirement income.

How to use this calculator

Adjust the four sliders:

• Initial corpus — the lump sum you’re starting with.
• Monthly withdrawal — what you plan to draw each month.
• Expected annual return — conservative 6–8% for typical retirement portfolios.
• Withdrawal period — how long you want the plan to run.

The calculator shows whether the corpus will last the full period, how much you will withdraw in total, and what balance remains at the end.

Limitations

The calculator assumes a constant monthly return, which is smooth in the calculator but lumpy in real life. In a bad year, withdrawals during a drawdown can permanently damage the corpus (sequence-of-returns risk). Conservative real-world planning often uses a 1–2% lower return rate than historical average to account for this.