Bill Bengen, the retirement researcher famous for creating the 4% rule, has a crucial message for early retirees: you may be living more frugally than necessary.
In an interview with CNBC’s Make It, Bengen expressed his belief that retirees who strictly adhere to his original guidance are potentially shortchanging themselves. He emphasized that the issue lies not with his research being incorrect, but rather with retirees fixating on a static percentage – such as the 4% rule or his updated 4.7% version – without taking into account the economic and market conditions that dictate whether withdrawals can be increased safely or require a more cautious approach.
This context is particularly vital for early retirees. Retiring at 45 or 50 means managing a portfolio for 40 to 50 years, making the difference between unnecessarily restricted living and sustainable spending incredibly significant.
Bengen’s original 4% rule, introduced in 1994, proposed that retirees could withdraw 4% of their portfolio in the first year and adjust that amount for inflation annually, ensuring they wouldn’t run out of money over 30 years. His updated research now recommends 4.7% for 30-year retirements and 4.2% for 50-year horizons. However, these figures represent worst-case scenarios – the withdrawal rates that would have succeeded even for retirees who began retirement during the most challenging financial periods in history.
“My research shows that if you experience a significant bear market early in retirement, it reduces your withdrawal rates because it depletes a substantial portion of the portfolio at the same time you’re drawing from it,” Bengen explained to CNBC. Conversely, avoiding these worst-case scenarios could enable retirees to withdraw significantly more.
Early retirees must consider various economic and market indicators to make informed withdrawal decisions. These indicators include market valuations at retirement start, inflation trends, interest rates, bond yields, and sequence of returns risk.
Market valuations play a substantial role in predicting future returns. The Shiller CAPE ratio, which divides current prices by 10-year average inflation-adjusted earnings, can provide valuable insights. Inflation trends can erode purchasing power, necessitating adjustments in spending. Interest rates and bond yields also influence withdrawal rates, with higher yields supporting more aggressive withdrawals.
Sequence of returns risk emphasizes the importance of monitoring investment returns early in retirement, as poor returns in the initial years can have long-lasting repercussions. Flexibility is key for early retirees, who can adjust discretionary spending, seek additional income opportunities, or downsize if needed.
To determine if their withdrawals are too conservative, early retirees should assess market valuations at retirement, portfolio performance in early retirement, expense flexibility, earning potential, and health and family longevity.
In conclusion, early retirement necessitates planning for a longer time horizon and realistic longevity expectations. By considering these factors and staying flexible with their financial strategies, early retirees can optimize their withdrawal rates and ensure sustainable financial security in the long run.

