Learn how to use SWP Calculator, define the inputs correctly, and interpret SWP sustainability results with scenario testing.
SWP Calculator is designed for one job: Withdrawal sustainability and corpus depletion timeline. The best way to use it is to model scenarios, not to hunt for a single “perfect” number.
If you understand how inputs like starting corpus, withdrawal, and expected return shape SWP sustainability, you can spot mistakes quickly and keep outputs decision-ready.
This tool models SWP sustainability for common cases so you can compare tradeoffs quickly.
If your scenario is unusual, treat the output as a starting point and validate assumptions before committing.
Key inputs: starting corpus, withdrawal, expected return, and years.
Be consistent about units (monthly vs annual) and scope (include fees/taxes if they exist in real life).
Compare outputs like ending corpus and depletion estimate across scenarios instead of trusting one number.
If the decision changes under downside assumptions, build a buffer or revise the plan.