QuickCalcy money guide

SWP Calculator Guide: Plan Monthly Withdrawals

A systematic withdrawal plan converts a corpus into recurring cash flow while the remaining balance stays invested.

How withdrawals are modeled

QuickCalcy applies monthly growth first and subtracts the withdrawal at month end. If the available balance is smaller than the request, only the remaining balance is withdrawn, preventing an unrealistic negative corpus.

Why sequence risk matters

Poor returns near the start of retirement can damage sustainability even when the long-run average later recovers. A smooth calculator cannot reproduce that path, so a positive ending corpus is not proof that a plan is safe.

Stress-test the plan

Reduce expected return, extend the period, increase withdrawals for inflation and test a zero-return case. Review ending corpus and total actually withdrawn together.

Mistakes and limitations

• Do not ignore inflation-linked spending.
• Do not assume withdrawals are tax-free.
• Do not use one return case as certainty.

The model excludes taxes, fees, changing withdrawals and uneven returns.