SWP Calculator: How Long Will Your Mutual Fund Corpus Really Last?
1. What Is an SWP, and Why Retirees Use It
A Systematic Withdrawal Plan (SWP) lets you invest a lump sum in a mutual fund and withdraw a fixed amount at regular intervals — usually monthly — while the rest of your money stays invested and continues to earn market-linked returns. It's essentially the reverse of a SIP: instead of building a corpus gradually, you're drawing it down gradually.
SWPs are widely used by retirees and anyone wanting a predictable monthly cash flow from an existing investment, because unlike a Fixed Deposit — where the entire interest is taxed at your income slab rate — an SWP withdrawal is only taxed on the capital gains portion, making it considerably more tax-efficient for a steady income stream.
2. What Makes This Calculator Different
Most SWP calculators online just show a single table for a fixed number of years. Trading Direction's calculator was built to answer the questions that actually matter for real financial decisions:
- Exact corpus longevity: Instead of forcing you to guess a duration and checking whether the ending balance is positive or zero, this calculator tells you precisely how many years and months your corpus will last — or how much will remain if it outlasts your chosen horizon.
- Step-up withdrawal support: Increase your monthly withdrawal by a fixed % every year to keep pace with rising expenses, exactly as you would in real life.
- Inflation-adjusted purchasing power: The calculator shows you what your final withdrawal is actually worth in today's rupees — so you can see whether your step-up rate is really keeping up with inflation, or falling behind it.
- Withdrawal rate verdict: Your first-year withdrawal rate is automatically compared against your expected return, and flagged as Conservative, Moderate, or Aggressive — so you know at a glance if you're withdrawing sustainably.
- Sequence-of-returns stress test: This is the feature no other free SWP calculator offers — you can simulate a market downturn in the first two years of your withdrawal phase and instantly see how much shorter your corpus lasts compared to a steady-return scenario. This is one of the biggest hidden risks in retirement withdrawal planning.
- Real month-by-month simulation: Every month, the withdrawal is deducted first and the remaining balance then earns that month's return — the same order of operations your mutual fund actually follows — rather than a simplified annual formula.
3. SWP Calculator
Enter your details below — everything is calculated inside your browser, and no data is saved anywhere.
Enter Your SWP Details
4. How to Use This Calculator — Step by Step
- Corpus & withdrawal: Enter the lump sum you're investing (or already have invested), your desired first-year monthly withdrawal, expected annual return, and any annual step-up you plan to apply.
- Planning assumptions: Set a simulation horizon (how far ahead you want to check), your inflation assumption, and your capital gains tax rate for a rough post-tax picture.
- Stress test: Keep the "market downturn" toggle on to see how a rough patch in the first two years of withdrawal would affect your corpus — this is the scenario most SWP calculators never show you.
- Click Calculate — you'll get your corpus longevity, withdrawal rate verdict, real purchasing power impact, and a full chart comparing the steady and stress scenarios.
Understanding withdrawal math is only half the picture — knowing how to read the market that your corpus is invested in matters just as much. Trading Direction's Basics of the Stock Market course covers fundamental analysis, mutual funds, and systematic investment planning — useful groundwork before you build the corpus you'll eventually run an SWP from.
5. The Logic Behind the Numbers
This calculator runs an actual month-by-month simulation, following the same order of operations your mutual fund uses:
For the stress test, the same simulation runs a second time with a reduced (or negative) return applied only to the first 24 months, then reverts to your normal expected return for the rest of the horizon. Comparing the two outcomes isolates the effect of sequence-of-returns risk — the same average long-term return can lead to very different outcomes depending on when the bad years happen to fall.
6. Example: ₹1 Crore Corpus, ₹65,000/Month Withdrawal
Consider a retiree with a ₹1 Crore corpus withdrawing ₹65,000/month, expecting a 10% annual return, with a 6% annual step-up on withdrawals:
| Input | Value |
|---|---|
| Initial Corpus | ₹1,00,00,000 |
| Monthly Withdrawal (Year 1) | ₹65,000 |
| Expected Return | 10% |
| Annual Step-Up | 6% |
| First-Year Withdrawal Rate | 7.8% p.a. |
At a 7.8% initial withdrawal rate against a 10% expected return, this corpus lasts roughly 18 years before depleting — because the 6% step-up compounds the withdrawal amount faster than the gap between return and withdrawal rate can sustain indefinitely. Now apply the stress test: if the first two years see a -8% return instead of +10% (a plausible market correction right at the start of retirement), the same corpus depletes in roughly 12 years — six years earlier, from the exact same long-term average assumption. That gap is sequence-of-returns risk in action, and it's exactly why the withdrawal rate verdict and stress test matter more than a single "final value" number.
7. Common SWP Mistakes to Avoid
- Withdrawing more than your expected return: If your annual withdrawal rate exceeds your expected return, your corpus is mathematically guaranteed to shrink over time — step-up only accelerates this.
- Ignoring sequence-of-returns risk: A market downturn in the first few years of withdrawal does far more damage than the same downturn happening later, because you're pulling money out while the corpus is already reduced.
- Not stepping up withdrawals at all: A flat withdrawal amount loses real purchasing power every year to inflation — check the "real value" figure in this calculator to see the erosion for yourself.
- Keeping the entire corpus in a single high-volatility fund: Diversifying and understanding different trading and investing styles can help you think through how much of your corpus should stay conservative versus growth-oriented once withdrawals begin.
- Ignoring tax on withdrawals: Only the gains portion of an SWP withdrawal is taxed, but it still reduces your effective take-home amount — factor this into your monthly budgeting, not just the gross withdrawal figure.
- Setting and forgetting the plan: Review your SWP annually against actual fund performance — a bad year or two may mean it's time to adjust the withdrawal amount rather than waiting for the corpus to run dry.
8. FAQs — SWP Calculator
How is SWP corpus longevity calculated?
Each month, the withdrawal amount is deducted from the corpus first, and the remaining balance then earns that month's expected return. This repeats until either the corpus is exhausted or your selected simulation horizon ends — giving an exact month-level answer instead of an approximate annual one.
What withdrawal rate is considered safe for an SWP?
As a rule of thumb, keeping your annual withdrawal rate meaningfully below your expected annual return gives your corpus the best chance of lasting indefinitely or growing. Withdrawing at a rate close to or above your expected return will steadily deplete the corpus, especially once step-up withdrawals are added.
What is sequence-of-returns risk, and why does it matter for SWP?
Sequence-of-returns risk is the danger that a market downturn early in your withdrawal phase does far more damage than the same downturn occurring later — because you're withdrawing a fixed amount from an already-reduced corpus, leaving less capital to benefit from the eventual recovery. Two plans with the same long-term average return can have very different outcomes depending purely on when the bad years occur.
Should my SWP withdrawal increase every year?
If you want your monthly income to keep pace with rising expenses, a step-up withdrawal (increasing the amount by a fixed % annually) is generally recommended. Without it, a flat withdrawal loses real purchasing power to inflation every year, even though the rupee amount stays the same.
How is an SWP withdrawal taxed?
Only the capital gains portion of each SWP withdrawal is taxed, not the entire withdrawal amount — this is one of the reasons SWPs are considered more tax-efficient than instruments like Fixed Deposits, where the entire interest is taxed at your income slab rate.
Can my corpus actually grow even while I'm withdrawing from it?
Yes — if your expected return is comfortably higher than your withdrawal rate (including any step-up), the growth on the remaining balance can outpace what you're withdrawing, allowing the corpus to increase over time rather than shrink.
What's the difference between SIP and SWP?
A SIP (Systematic Investment Plan) is used to build wealth by investing a fixed amount regularly, typically during your working years. An SWP does the opposite — it's used to draw down an already-built corpus in fixed regular amounts, typically during retirement or whenever you need a steady income stream from your investments.