What is an SWP calculator?
An SWP calculator shows what happens to an investment when you take a fixed amount out of it at regular intervals while the rest stays invested. SWP stands for Systematic Withdrawal Plan — an instruction to a mutual fund or broker to sell units every month, quarter or year and pay the proceeds to your bank. Enter your corpus, the withdrawal, the expected return and the period, and the calculator returns four answers: how much you will withdraw in total, how much growth the money earns, what is left at the end, and whether the corpus runs out first.
Most online SWP calculators stop there. This one goes further, because a withdrawal plan usually lasts 15 to 30 years and over that span inflation matters as much as returns. Every result is also shown in today’s money, withdrawals can rise every year, and the full month-by-month schedule is one click away.
How the SWP calculation works
The calculator simulates your plan one month at a time, the same way a fund house processes an SWP:
- Withdraw. On each withdrawal date, units worth your SWP amount are redeemed (at the start of the period by default).
- Grow. The remaining balance earns one month of return — your annual rate divided by 12.
- Repeat for every month of the plan, raising the withdrawal once a year if you set a step-up.
- Deflate. Each value is divided by (1 + inflation)years to express it in today’s purchasing power.
Because it is month-by-month rather than a single formula, the projection handles step-ups, quarterly or yearly withdrawals and the exact depletion month correctly. The full equations are on the methodology page.
A worked example: ₹50 lakh, ₹30,000 a month
Say you retire with ₹50 lakh in a hybrid mutual fund expected to earn 8% a year, and you set up an SWP of ₹30,000 a month for 20 years, with inflation at 6%.
| Result | Flat ₹30,000 | ₹30,000 rising 6% a year |
|---|---|---|
| Total withdrawn | ₹72.0 lakh | ₹1.02 crore |
| Total withdrawn in today’s money | ₹42.4 lakh | ₹59.3 lakh |
| Corpus left after 20 years | ₹68.5 lakh | ₹0 — runs out after 17 years 1 month |
| Last withdrawal in today’s money | ₹9,354 | ₹28,302 |
The flat plan looks comfortable — the corpus even grows — but by year 20 each ₹30,000 payment buys what ₹9,354 buys today. Indexing the withdrawal to inflation protects your lifestyle but drains the corpus three years early. The calculator’s Plan checks panel finds the balance point for you: here, a starting withdrawal of ₹26,288 rising 6% a year lasts exactly 20 years.
Why an SWP calculator with inflation matters
Inflation silently halves a fixed income roughly every 12 years at 6%, and every 24 years at 3%. India’s consumer price inflation has averaged around 6% over the past two decades, while the US long-run average is close to 3%. An SWP calculator without inflation answers the wrong question — “how many rupees will I receive?” — instead of “how much will that income buy?”. Turn on the step-up and set it equal to inflation to see a realistic plan.
What you can do with this SWP calculator
- Choose the frequency — monthly, quarterly, half-yearly or yearly withdrawals, at the start or end of each period.
- Step up withdrawals every year, or tick “Match inflation”.
- See when the money runs out — down to the calendar month — and how far short of your plan that is.
- Reverse-calculate the highest sustainable withdrawal, the withdrawal that preserves your capital, and the corpus you would need.
- Stress-test your plan in the “How long will my money last?” grid across 25 return and withdrawal combinations.
- Compare scenarios side by side, download the schedule as CSV, print it, or share a link to your exact inputs.
- Plan in your currency — rupees with lakh/crore formatting for an SWP calculator India users trust, dollars for the SWP calculator USA, and ten more.
Using it as a mutual fund SWP calculator
In India, an SWP is set up on the growth option of a mutual fund. Each instalment redeems units at that day’s NAV, so the number of units falls while the value of the remaining units keeps compounding. For the expected return, use the fund’s realistic long-term figure after expense ratio — around 6–7% for debt funds, 8–10% for balanced-advantage and hybrid funds, and 10–12% for diversified equity — then test a couple of points lower. Look at a fund’s 5- and 10-year annualized return in its factsheet, and choose an equity-debt split that suits your age.
SIP and SWP: two halves of one plan
A SIP builds the corpus; an SWP spends it. If you are still working, the SIP and SWP calculator projects both phases together — for example, ₹25,000 a month invested for 20 years with a 10% yearly step-up grows to about ₹4.97 crore at 12%, which can then fund an inflation-linked ₹2 lakh monthly SWP for 25 years.
Five rules for a withdrawal plan that lasts
- Start near 4%. Research going back to William Bengen’s 1994 study found that a 4% initial withdrawal, raised with inflation, survived every 30-year US market period tested.
- Keep two to three years of withdrawals in debt so a market fall never forces you to sell equity at a loss.
- Use a conservative return — sequence-of-returns risk means poor early years hurt far more than poor late ones.
- Index to inflation, or at least review the amount every year.
- Mind tax and exit loads — only the gain portion of each redemption is taxed, which usually makes an SWP more tax-efficient than a dividend payout (see SWP taxation in India).
All projections assume a constant return and are estimates, not guarantees. Past returns do not predict future performance.