How the SWP estimate is calculated
For each month, the calculator applies New balance = Previous balance × (1 + Annual return ÷ 12) − Monthly withdrawal. It repeats this until the selected period ends or the balance reaches zero.
Timing
Estimated monthly growth is applied before that month's withdrawal.
Withdrawals
The withdrawal stays fixed and is not increased for inflation.
Assumptions
Returns are constant; volatility, tax, fees, exit loads, and irregular withdrawals are excluded.