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Rethinking Retirement Spending: The Hidden Cost of Underspending and the Evolution of the 4% Rule

Vicki Robin
By Vicki Robin
·5 min read

A significant portion of retirees arrive at their advanced years with a substantial portion of their retirement funds unspent, contradicting the common fear of outliving their savings. This prevalent issue, referred to as 'underspending,' can often be linked to the rigid application of traditional financial guidelines, such as the 4% withdrawal rule. While this rule aims to ensure financial longevity, it may inadvertently lead individuals to sacrifice quality of life during retirement by being overly conservative. Financial experts are now highlighting the overlooked risks associated with underspending, advocating for more adaptable spending approaches to help retirees better utilize their accumulated wealth for a richer post-career life.

For decades, individuals have been advised to meticulously save for retirement, often with the primary goal of never depleting their nest egg. However, data from the Employee Benefit Research Institute (EBRI), spanning from the early 1990s through 2022, reveals an interesting trend: approximately one-third of retirees maintain or even increase their original savings (excluding home equity) well into their mid-80s. This suggests a widespread reluctance to access or spend their accumulated wealth. Financial advisors, including Marianela Collado, a certified financial planner, describe this as a 'life not lived,' where fear of financial insecurity leads to missed opportunities like travel and leisure. This cautious behavior often stems from a lifelong habit of saving, making the transition to spending a psychological challenge for many, as noted by Craig Copeland of EBRI.

The conventional 4% withdrawal rule, introduced by financial planner William Bengen in 1994, was designed as a safe benchmark for portfolio longevity, suggesting retirees withdraw 4% of their initial savings annually, adjusted for inflation. While effective in mitigating the risk of running out of money, especially during volatile economic periods, this rule often results in retirees accumulating excess funds. Bengen himself has since revised his recommendation, acknowledging that a 4.7% withdrawal rate could be sustainable. Furthermore, research from Morningstar indicates that with flexible spending adjustments—taking more during prosperous market years and less during downturns—retirees could safely initiate withdrawals as high as 5.7%.

Embracing dynamic spending offers a more personalized and potentially fulfilling retirement experience. Instead of a fixed, inflation-adjusted withdrawal, this approach allows retirees to adjust their spending based on market performance. As Zach Teutsch, founder of Values Added Financial, explains, 'Overspending is risky. But underspending is risky too.' This strategy involves increasing withdrawals when the market performs well (e.g., 7%) and reducing them during downturns (e.g., 2.5%), thereby easing pressure on the portfolio when it's most vulnerable and capitalizing on growth when it's strong. This method also aligns more closely with the natural U-shaped pattern of retirement spending, where expenses are typically higher early on for active pursuits, dip during less active middle years, and rise again for potential long-term care needs, unlike the static increment offered by the 4% rule.

Implementing dynamic spending requires discipline, particularly the ability to reduce spending when markets decline. A practical approach involves establishing a baseline withdrawal rate, such as the 4% rule, as a safety net, then using 'guardrails' to guide adjustments. This means increasing spending when the portfolio performs exceptionally well and trimming it if asset values fall below a predefined threshold. Additionally, securing essential living expenses—housing, food, and insurance—through guaranteed income sources like pensions or Social Security can provide a stable foundation, allowing retirees to spend their investment income more freely without constant worry. This strategic shift moves beyond the ingrained caution of the traditional 4% rule, encouraging retirees to develop the nuanced skill of purposeful spending to fully embrace their golden years rather than simply preserving wealth.

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