SWP Calculator
Calculate your Systematic Withdrawal Plan returns with lump sum investment and regular withdrawals.
What is the SWP Calculator?
A Systematic Withdrawal Plan (SWP) is a financial strategy that allows investors to withdraw a specific amount of money from their investment portfolio (typically a mutual fund, index fund, or retirement account) at regular intervals — usually monthly or yearly. It is widely used to generate a steady stream of income during retirement or post-career phases.
Instead of withdrawing your entire investment in a single lump sum, SWP allows your remaining balance to stay invested and continue earning interest or compound returns. This helps make your accumulated wealth last longer and provides a structured cash flow.
The SWP Calculator helps you simulate how your investment corpus will decrease or grow over time. You specify the initial lump sum amount, how much you wish to withdraw, how frequently, and the expected annual return rate. The calculator dynamically computes your remaining balance, total withdrawn amount, and total returns.
Practical Examples & Reference Guide
Here is a comparison showing the performance of a $100,000 initial investment with a $600/month withdrawal at an 8% annual return rate over various terms:
| Withdrawal Term | Total Withdrawn | Total Returns | Final Remaining Balance |
|---|---|---|---|
| 5 Years | $36,000 | $33,622 | $97,622 |
| 10 Years | $72,000 | $66,039 | $94,039 |
| 15 Years | $108,000 | $97,092 | $89,092 |
| 20 Years | $144,000 | $126,108 | $82,108 |
| 25 Years | $180,000 | $152,192 | $72,192 |
Note: Because the portfolio grows at 8% annually, it earns substantial interest, allowing the $100,000 corpus to comfortably support $600/month withdrawals for 25 years while leaving a final balance of over $72,000!
In-Depth Technical Guide
How SWP Calculations Are Performed
The SWP Calculator evaluates the investment balance period-by-period (usually month-by-month) using compound interest combined with regular deductions.
Calculation Sequence per Period:
- Deduct Withdrawal: At the start of each withdrawal period, the regular withdrawal amount ($W_t$) is deducted from the current balance. $$B'{t} = B{t-1} - W_t$$ (If $B'{t}$ falls below zero, the withdrawal is capped at $B{t-1}$, the balance becomes zero, and the corpus is depleted.)
- Compound Growth: The remaining balance ($B'{t}$) compounds at the periodic interest rate ($r$) to determine the ending balance ($B_t$) for that period.
$$B_t = B'{t} \times (1 + r)$$
$$I_t = B'_{t} \times r$$
Where:
- $B_{t-1}$ = Balance at the end of the previous period.
- $W_t$ = Withdrawal amount for the current period (optionally increased by an annual increment).
- $r$ = Periodic interest rate (for annual rate $R$, monthly rate $r = (1 + R/100)^{1/12} - 1$).
- $I_t$ = Interest earned during the current period.
- $B_t$ = Ending balance of the current period.
Handling SWP Increment
If you configure an annual increment, the withdrawal amount increases every 12 months. This is crucial for hedging against inflation during long-term retirement planning.
- Fixed Increment ($): The withdrawal amount increases by a flat currency amount every year.
- Percentage Increment (%): The withdrawal amount increases compounding by a set percentage every year.
The Risk of Corpus Depletion
If your regular withdrawal rate (plus annual increments) is higher than the rate of return on your investment, the corpus will steadily shrink. If it shrinks to zero, your SWP is depleted, meaning no further withdrawals are possible. Our calculator warns you of the exact month and year this occurs so you can adjust your strategy.