SWP Calculator: How Long Your Money Lasts, Truly
Most SWP tools stop at how long your corpus lasts. This one adds the honest picture: whether it grows or runs dry and when, what your income is really worth after inflation, and an estimate of the tax on your withdrawals.
Corpus Depletion Model: Monthly Withdrawal and Growth
Each month you withdraw first, then the remaining corpus earns its return.Turning a Corpus Into a Monthly Salary
You have built a corpus, through years of saving and investing, and now you want it to pay you a regular income, a monthly amount that lands in your account like a salary. That is exactly what a systematic withdrawal plan does.
You keep your money invested in a mutual fund, where it continues to earn returns, and you instruct the fund to sell just enough units each month to pay you a fixed sum.
It is the mirror image of a systematic investment plan: instead of putting money in every month, you take money out. Where a SIP builds a corpus rupee by rupee over your working years, an SWP unwinds it in a controlled, tax-efficient stream through your retirement, which is why the two together span the full arc of a financial life.
The appeal over a fixed deposit is real. In an FD, your money earns a fixed rate and the entire interest is taxed at your slab.
In an SWP, your corpus stays invested in the market, where over the long term it can earn more and fight inflation, while you draw an income, and the tax is far gentler because only the gain portion of each withdrawal is taxed, not the whole amount. For a retiree, this combination of ongoing growth, regular income, and tax efficiency is powerful.
But it comes with a question that decides everything: will your corpus last? If you withdraw less than it earns, the corpus grows even as it pays you, and the income can continue indefinitely. If you withdraw more than it earns, the corpus shrinks month by month and will eventually run dry, perhaps before you expected.
This calculator answers that question honestly, showing whether your corpus grows, lasts your target period, or depletes, and if it depletes, exactly when. It also shows what your income will really be worth after inflation, and estimates the tax, so you see the true picture, not a flattering one.
How Does an SWP Work?
The mechanics are simple month by month, and understanding them explains why the withdrawal rate matters so much.
The monthly cycle
Each month, the fund pays you your withdrawal amount by selling units, and the money that remains stays invested and earns its return. In this calculator’s convention, the withdrawal happens first and the remaining balance then grows by one month’s return, a conservative order that does not assume growth on money you have already taken out.
Repeated month after month, this cycle either builds or drains your corpus depending on whether the return on what remains exceeds what you are taking out.
The tug of war
Every month is a tug of war between your withdrawal, which pulls the corpus down, and the return, which pushes it up. If your annual withdrawal is a smaller percentage of your corpus than the return rate, the return wins and the corpus grows over time even while paying you.
If your withdrawal percentage exceeds the return, your withdrawals eat into the principal, and each month leaves a little less to earn the next month’s return, so the decline accelerates toward zero. The withdrawal rate, your annual withdrawal as a percentage of your corpus, is the single number that decides which way the tug of war goes. Keep an eye on it above all else, because it, more than the size of your corpus, determines whether your income endures.
The step-up option
A fixed withdrawal loses purchasing power to inflation, so many retirees increase their withdrawal a little each year to keep their real income steady. This is a step-up SWP.
Increasing your withdrawal annually makes the plan more realistic for a long retirement, but it also draws down the corpus faster, so it shortens how long the money lasts. The calculator lets you set a step-up percentage and shows its effect, so you can balance keeping pace with inflation against making the corpus last.
The Safe Withdrawal Rate: How Much Is Too Much
This is the heart of SWP planning, the discipline that separates an income that lasts from one that runs out too soon.
Your withdrawal rate is your annual withdrawal divided by your corpus.
Withdraw 6 lakh a year from a 1 crore corpus and your rate is 6 percent. The rule of thumb, adapted for Indian conditions, is to keep this rate comfortably below your expected return, and generally at or below around 6 percent, so that the corpus can sustain the withdrawals through market ups and downs and a long retirement.
A rate well below your return lets the corpus grow; a rate near your return keeps it roughly steady; a rate above your return steadily depletes it.
The famous 4 percent rule, from retirement research, suggests that withdrawing 4 percent of your initial corpus, then increasing that amount for inflation each year, gives a high chance of the money lasting 30 years or more.
In the Indian context, with higher inflation and different return profiles, planners often adjust this, but the principle holds: a modest initial withdrawal rate, rising gently with inflation, is far safer than a high fixed rate.
The danger is over-withdrawal, taking out an amount that feels affordable early on but that the corpus cannot sustain, especially if poor market years come early. The calculator’s verdict tells you immediately which side of the line your plan falls on.
Why Does SWP Beat an FD on Tax?
The tax advantage of an SWP over a fixed deposit is substantial and often underappreciated, and it is worth understanding precisely.
When you draw money from a fixed deposit, or when it matures, the entire interest you earned is added to your income and taxed at your slab rate, which for many retirees can be 20 or 30 percent. Every rupee of interest is taxed. An SWP works differently.
Each withdrawal from your mutual fund is treated as a redemption of units, and only the capital gain portion of that redemption, the growth, is taxed, not the part that represents your own original capital coming back to you. Since each withdrawal is a mix of principal and gain, only a fraction is taxable.
On top of that, the gains on equity-oriented funds held for over a year are long-term capital gains, taxed at a concessional rate of 12.5 percent, and the first 1.25 lakh of such gains each year is exempt from tax entirely. So a retiree drawing a modest income from an equity SWP may pay little or no tax in many years, and a low rate even when they do, compared with an FD where the full interest is taxed at slab. The calculator gives a rough estimate of this long-term capital gains tax so you can see the gentle tax drag, though the exact figure depends on your specific gains and holding periods, as set out by the Income Tax Department.
The Bucket Strategy: A Resilient SWP
The biggest threat to an SWP is not low average returns but a bad sequence of returns early on, and the bucket strategy is the most widely recommended way to defend against it.
Why sequence matters
If markets fall sharply in the first years of your withdrawals, you are forced to sell units at depressed prices to fund your income, permanently shrinking the corpus that must later recover. The same fall, occurring later when the corpus has grown, does far less damage.
Two retirees with identical average returns can have wildly different outcomes purely because of when the good and bad years fell, which is why relying on a constant-return projection, as this and every calculator does, understates the real risk of early downturns.
The three buckets
The bucket strategy divides your corpus by when you will need the money. The first bucket holds two to three years of expenses in safe, liquid instruments like short-term deposits, from which you draw your income, so you never have to sell equity in a downturn.
The second bucket holds four to seven years of expenses in debt funds for stability and modest growth. The third bucket holds the rest in equity for long-term growth to beat inflation. As time passes, you refill the first bucket from the second, and the second from the third, so your immediate income is always insulated from market falls.
How it protects you
Because your near-term income comes from the safe bucket, a market crash does not force you to sell equity at the worst time. You simply draw from the safe assets and give the equity bucket time to recover, which it historically has over multi-year periods.
This turns the dangerous sequence-of-returns risk into a manageable one, at the cost of holding some money in lower-returning safe assets. For a retiree drawing an SWP, the peace of mind and resilience the bucket approach provides often outweigh the modest return given up on the safe portion.
SWP Versus Other Retirement Income Options
An SWP is one of several ways to generate retirement income, and understanding how it compares helps you decide whether and how much to use it.
Against a fixed deposit, the SWP wins on growth potential and tax, as discussed, but the FD wins on certainty; its return is guaranteed and its capital does not fluctuate, while an SWP’s corpus rises and falls with markets.
Many retirees use both: an FD or similar for guaranteed baseline income and stability, and an SWP for growth and tax-efficient income on top. The right balance depends on your risk tolerance and how much certainty you need.
Against an annuity, which pays a guaranteed income for life in exchange for a lump sum, the SWP offers more flexibility and better tax treatment, and it keeps your capital yours, to be passed on, whereas a typical annuity consumes the capital in exchange for the guarantee.
The annuity’s advantage is that it removes longevity risk entirely; it pays as long as you live, however long that is, while an SWP can run out. Some retirees annuitise part of their corpus for a guaranteed floor and run an SWP on the rest for flexibility and growth.
Against dividends, the SWP gives control and tax efficiency, as covered. Against simply keeping money in a savings account and spending it down, the SWP keeps the bulk of your money invested and growing rather than idle and losing value to inflation, which over a long retirement makes an enormous difference to how long your money lasts and what it is worth.
The broad lesson is that an SWP is rarely the whole answer but is often a valuable part of it. Combined with some guaranteed income for security and structured with a bucket approach for resilience, an SWP lets the growth-oriented part of your corpus keep working for you, paying a flexible, tax-efficient income while retaining the potential to grow.
The calculator helps you size that SWP component sensibly, showing whether the withdrawal you plan is one your corpus can sustain.
How to Read Your SWP Results
The calculator produces a verdict and several figures, and reading them together gives you a clear judgement on whether your plan works.
The verdict is the headline. It tells you plainly whether your corpus grows, lasts your target horizon, or runs out early, and if it runs out, exactly when.
This is the answer to the question that matters most, and its colour, green for a corpus that grows or lasts and red for one that depletes early, gives you an immediate sense of whether your plan is sustainable or needs adjusting. A red verdict is a signal to reduce your withdrawal, extend your corpus, or accept that the income will end.
The withdrawal rate is the diagnostic figure behind the verdict. It tells you what percentage of your corpus you are drawing each year, which you can compare directly against your return.
A rate well below your return produces a growing corpus; a rate near it, a stable one; a rate above it, depletion. Watching this number as you adjust your withdrawal shows you exactly where the sustainable boundary lies for your corpus and return.
The final corpus and total withdrawn show the scale of the outcome: how much income you draw over the period and what remains at the end. A large final corpus alongside substantial withdrawals is the sign of a comfortably sustainable plan, while a final corpus near zero warns that you are close to the edge.
The real-value figure then adds the honest note, showing what your withdrawal will be worth in today’s money at the end, which reveals whether an income that looks adequate now will still cover your needs after years of inflation.
The estimated tax completes the picture, giving a sense of the gentle drag on your income from long-term capital gains tax, far lighter than the slab-rate tax on an equivalent fixed-deposit income.
Read together, these figures answer the retiree’s real questions: will my money last, is my income sustainable, what will it really be worth, and what will I keep after tax.
That completeness is what separates a plan built on honest numbers from one built on a single hopeful figure. A retiree who reads all these figures together, rather than fixating on the monthly withdrawal alone, is far better placed to make an income last.
Common SWP Mistakes: What to Avoid
A few errors recur when retirees set up an SWP, and avoiding them protects both your income and your capital.
The first and gravest is over-withdrawing. Setting a withdrawal that feels affordable in the first year but exceeds what the corpus can sustain leads inevitably to depletion, often faster than expected once a poor market year strikes. Always check that your withdrawal rate is comfortably below your return, and let the verdict confirm the plan is sustainable before you rely on it.
The second is ignoring inflation. A fixed withdrawal that meets your needs today will fall short in a decade, as prices rise while your income stays flat. Either build in a step-up or plan for your expenses to be covered by a withdrawal whose real value, not just its nominal amount, remains adequate throughout your retirement.
The third is ignoring the sequence-of-returns risk. Placing your entire corpus in equity and drawing an SWP directly from it exposes you to the danger of an early crash forcing sales at low prices. A bucket approach, keeping near-term income in safe assets, guards against this and is worth the modest return given up.
The fourth is neglecting to review. An SWP is not a set-and-forget arrangement. Markets, your needs, and inflation all change, and a withdrawal that was sustainable at the outset may not remain so, or may prove overly cautious. Review your SWP periodically, using the calculator to recheck sustainability against your current corpus and outlook, and adjust your withdrawal as needed.
Avoiding these four, withdrawing sustainably, accounting for inflation, guarding against early downturns, and reviewing regularly, covers the great majority of SWP mistakes. The calculator supports each by showing your sustainable withdrawal rate, the real value of your income, and a clear verdict you can recheck whenever your circumstances change, so that your retirement income rests on sound numbers rather than optimistic assumptions.
Worked Examples: Three Retirees Drawing Income
An SWP plays out very differently depending on the withdrawal rate and whether a step-up is used. Each figure below is calculated exactly as the tool does it.
An SWP plays out differently depending on the withdrawal rate. Each figure below is calculated exactly as the tool does it.
Ramesh retires with 50 lakh in a hybrid fund expected to return 10 percent and draws 25,000 rupees a month, a withdrawal rate of 6 percent. Because his withdrawal rate is below his return, the tug of war favours growth.
Over ten years he draws a total of 30 lakh in income, yet his corpus does not shrink; it grows to about 83 lakh, because the return on the money that stays invested more than covers his withdrawals.
The calculator shows the green verdict: his corpus grows. Ramesh has the ideal position, a sustainable income that leaves his capital larger than when he started, though he must remember that 25,000 buys less each year.
Sunita has a smaller corpus of 5 lakh but needs 10,000 rupees a month, a withdrawal rate of 24 percent, far above any realistic return.
She hopes an 8 percent return will stretch it, but the maths is unforgiving. The calculator shows the red verdict: her corpus runs out after about 5 years and 1 month, long before the 20 years she was planning for.
Each month her large withdrawal eats deep into a small principal, leaving too little to earn meaningful returns, and the decline accelerates. Seeing this clearly, Sunita knows she must either reduce her withdrawal drastically, add to her corpus, or plan for the income to stop after a few years.
Vikram retires with 1 crore, draws 40,000 rupees a month at a 4.8 percent rate, expecting 10 percent returns over 20 years. His corpus grows comfortably, but he worries that 40,000 will feel small in fifteen years as prices rise. So he adds a 6 percent annual step-up, increasing his withdrawal each year to match inflation.
The calculator shows that even with the rising withdrawals, his corpus still grows over the 20 years, though it ends smaller than it would with a fixed withdrawal, because the step-up draws more out over time. Vikram has found the balance: an income that keeps its real value, funded by a corpus that can still afford to grow.
Six Tips for a Lasting SWP
Making a systematic withdrawal plan last through a long retirement rests on a few disciplines around the withdrawal rate, inflation, and market risk. These six keep your income sustainable.
Quick Reference: SWP Figures
Every formula the calculator uses and the key SWP figures, gathered for reference. Keep it handy to check a result or judge a withdrawal rate.
| Monthly cycle | Remaining = (previous minus withdrawal) x (1 + return/12) |
| Withdrawal rate | Annual withdrawal / corpus x 100 |
| Real value of income | Withdrawal / (1 + inflation) to the power years |
| Corpus grows when | Withdrawal rate is below the return rate |
| Safe withdrawal rate (India) | Generally at or below 6 percent |
| The 4 percent rule | 4 percent initial, rising with inflation, lasts 30-plus years |
| LTCG on equity funds | 12.5 percent on gains above 1.25 lakh per year |
| FD interest tax | Full interest taxed at your slab rate |
| India long-run inflation | Around 6 percent |
SWP Frequently Asked Questions
What is a systematic withdrawal plan?
A systematic withdrawal plan, or SWP, is a facility in mutual funds that lets you withdraw a fixed amount at regular intervals, usually monthly, from your investment. The fund sells just enough units each period to pay you, while the rest of your money stays invested and continues to earn returns.
It is the opposite of a systematic investment plan, where you put money in regularly. An SWP is commonly used to turn a lump-sum corpus into a steady income, especially in retirement, giving you a monthly payout like a salary.
How long will my corpus last with an SWP?
It depends on the tug of war between your withdrawal and your return. If your annual withdrawal is a smaller percentage of your corpus than the return it earns, the corpus can last indefinitely or even grow.
If your withdrawal exceeds the return, the corpus depletes over time and will eventually run out. The calculator shows exactly how long your corpus lasts for your specific corpus, withdrawal, and return, and tells you whether it grows, lasts your target period, or runs dry, and if so, when.
What is a safe withdrawal rate?
The withdrawal rate is your annual withdrawal as a percentage of your corpus. A safe rate is one your corpus can sustain through market ups and downs and a long retirement. Adapted for Indian conditions, a rate at or below around 6 percent is generally considered reasonably safe, and the lower it is relative to your return, the safer.
The famous 4 percent rule suggests withdrawing 4 percent of your initial corpus, rising with inflation, to make it last 30 years or more. A rate above your return steadily depletes the corpus.
Can my corpus grow even while I withdraw?
Yes, and this is the ideal outcome. If your withdrawal rate is below your return rate, the return on the money that stays invested more than covers what you take out, so the corpus grows over time even as it pays you an income.
For example, drawing 6 percent a year from a corpus earning 10 percent leaves a surplus that compounds, so after ten years the corpus can be substantially larger than when you started. The calculator shows this with a clear verdict when your plan produces a growing corpus.
What is a step-up SWP?
A step-up SWP increases your withdrawal amount by a set percentage each year, usually to keep pace with inflation so your income holds its real value. Without a step-up, a fixed withdrawal buys less every year as prices rise, eroding your standard of living over a long retirement.
A step-up of five or six percent a year keeps your real income roughly steady. The trade-off is that rising withdrawals draw the corpus down faster, so a step-up plan needs a lower starting withdrawal rate to remain sustainable. The calculator lets you model any step-up.
How is an SWP taxed?
Each SWP withdrawal is treated as a redemption of mutual fund units, and only the capital gain portion, the growth, is taxed, not the part representing your original capital returning to you. For equity-oriented funds held over a year, the gains are long-term capital gains, taxed at 12.5 percent, with the first 1.25 lakh of such gains each year exempt.
This makes an SWP far more tax-efficient than a fixed deposit, where the entire interest is taxed at your slab rate. The calculator gives a rough estimate of this tax so you can see the gentle drag.
Why is an SWP more tax-efficient than an FD?
Because of what gets taxed and at what rate. In a fixed deposit, the entire interest is added to your income and taxed at your slab, which can be 20 or 30 percent for many retirees.
In an SWP, only the gain portion of each withdrawal is taxed, not your returning principal, and for long-term equity gains the rate is a concessional 12.5 percent with an annual exemption of 1.25 lakh.
So a retiree drawing a modest income from an equity SWP often pays far less tax than they would on the same income from an FD, leaving more in hand.
What happens if I withdraw too much?
If your withdrawal exceeds what your corpus earns, you are drawing down the principal, and each month leaves less to generate the next month’s return, so the decline accelerates toward zero. The corpus will run out, sometimes far sooner than you expect.
Over-withdrawal is the central risk of an SWP, and it is especially dangerous if poor market years come early. The calculator’s verdict warns you clearly when your plan depletes the corpus and tells you the exact point at which the money runs out, so you can adjust before it is too late.
Should I use an SWP for my retirement income?
An SWP is a strong option for retirement income because it keeps your corpus invested and growing while paying you, fights inflation better than a fixed deposit, and is taxed gently. It suits a retiree who has built a reasonable corpus and wants a flexible, tax-efficient income.
The key is a sustainable withdrawal rate and an awareness of market risk, since your corpus is invested. Many retirees combine an SWP with safer instruments in a bucket approach, keeping a few years of expenses in low-risk assets to cushion market downturns.
What is the sequence of returns risk?
Sequence of returns risk is the danger that poor market years early in your withdrawal phase harm you more than the same poor years later.
When you withdraw from a corpus that has just fallen, you sell more units at low prices to fund your withdrawal, permanently shrinking the base that must recover, so an early downturn can be far more damaging than a later one even if average returns are the same.
This is why keeping some money in safer assets for the early years of an SWP, a bucket strategy, is often recommended to reduce this risk.
How much corpus do I need for a given monthly income?
Work backward from a safe withdrawal rate. If you want a monthly income and aim for a sustainable withdrawal rate of, say, 6 percent, your corpus needs to be your annual income divided by 6 percent.
For a monthly income of 50,000, that is 6 lakh a year, so a corpus of about 1 crore at a 6 percent rate. For a safer 4 percent rate, you would need 1.5 crore. Enter different corpus and withdrawal figures into the calculator to find the combination that gives your desired income sustainably.
Does the calculator account for inflation?
Yes, in two ways. It shows the real value of your withdrawal at the end of your horizon, revealing how much your income will actually be worth in today’s rupees once inflation has eroded it, which is often a sobering figure over a long period.
And it lets you set a step-up percentage so your withdrawal rises each year to keep pace with inflation. Together these let you plan for the real cost of living rather than being misled by a nominal withdrawal amount that looks adequate today but will not be in the future.
Can I change my SWP amount later?
Yes. An SWP is flexible; you can increase, decrease, pause, or stop your withdrawals at any time by instructing your fund. This flexibility is a real advantage, letting you adjust to changing needs or to how your corpus is performing.
If markets have done well, you might raise your withdrawal; if they have fallen, you might reduce it to protect the corpus. The calculator models a fixed or steadily stepped-up withdrawal, but in practice you can and should review and adjust your SWP periodically as circumstances change.
Is an SWP better than dividends for income?
Generally yes, for most investors. An SWP gives you control over exactly how much income you receive and when, whereas dividends are decided by the fund and are irregular and uncertain.
An SWP is also more tax-efficient, since dividends are taxed at your slab rate in your hands, while SWP withdrawals are taxed only on the gain portion at capital gains rates. And an SWP lets your corpus stay fully invested and compounding, rather than paying out gains as dividends. For a planned, tax-efficient income, an SWP is usually the better route.
What return should I assume for an SWP?
Use a realistic, slightly conservative figure based on the type of fund. Equity-oriented funds have historically returned around 10 to 12 percent over long periods, but with significant year-to-year variation, while hybrid and debt funds return less with more stability.
For a retirement SWP, many planners assume a moderate return of around 8 to 10 percent for a balanced portfolio, and lean conservative to avoid over-withdrawing. Since your corpus is invested and returns vary, treat the projection as an estimate and keep your withdrawal rate low enough to withstand years that fall short.
How accurate is this calculator?
The month-by-month projection is exact for the return, withdrawal, and step-up you enter, using the standard withdraw-first convention. But it assumes a constant return every month, whereas real markets fluctuate, so actual outcomes will vary, and a bad sequence of early years can deplete a corpus faster than a constant-return projection suggests.
The tax figure is a rough estimate, since your actual tax depends on your specific gains and holding periods. Use the calculator to compare scenarios and to check whether your withdrawal rate is sustainable, treating the exact figures as well-founded estimates.
Related Calculators: More Free Tools
If this SWP tool helped, these related calculators from CalcWise cover building your corpus, planning income, and the tax that sits alongside it.
Disclaimer and Editorial Transparency
This SWP calculator projects corpus depletion using the standard withdraw-first method and assumes a constant return, which real markets do not deliver. It is for planning and education, not investment advice. The real-value figure estimates purchasing power using the inflation rate you set, and the tax figure is a rough estimate of long-term capital gains tax under rules from the Income Tax Department; your actual tax depends on your specific gains, fund type, and holding periods. Investments in mutual funds carry market risk, and a poor sequence of returns can deplete a corpus faster than projected. Consult a SEBI-registered adviser for personal planning. CalcWise.Finance does not store the values you enter and this tool carries no advertising.