The 4% Rule vs. Dynamic Spending: How to Ensure Your Portfolio Outlives You
For decades, the "4% Rule"—formulated by William Bengen in 1994—has stood as the gold standard for retirement withdrawals. It suggested that withdrawing 4% of your original portfolio (adjusted annually for inflation) would survive any 30-year span in modern history.
The Flaws of Rigidity
In a landscape characterized by low yields and sporadic volatility, rigid adherence to a static rule can be dangerous. A dynamic spending model, which dictates tightening the belt during bear markets and spending more flexibly during bull runs, often leads to higher lifetime withdrawal limits and lower sequence-of-returns risk.
Before deciding on a distribution strategy, you must define the "Income Bridge"—the gap between your desired lifestyle expenses and guaranteed income sources like Social Security or pensions.
The Retirement Income Bridge
Calculate the monthly savings required to bridge the gap between Social Security and your dream retirement income.
Your Monthly Income Gap
To generate this missing income dynamically, your target portfolio size at retirement must be $0.
See exactly how much you need to save per month starting today to bridge this gap.
The Action Plan
To hit your target portfolio size of by age , you must consistently save:
Assuming an aggressive 7% average annual return and a conservative 4% dynamic withdrawal rate at retirement.