A Systematic Withdrawal Plan (SWP) is a method to withdraw funds from an investment or retirement account on a regular schedule, such as monthly or quarterly, to provide steady income. Often used in retirement, SWPs allow individuals to customize withdrawal amounts or base them on account value, helping manage cash flow. Withdrawals may be subject to taxes and, if taken before age 59½, potential penalties unless structured under IRS rules like Rule 72(t). SWPs offer predictability but reduce the account balance over time.