Origin of the 4% Rule and Its Creator Bill Bengen
The 4% rule was conceived by financial advisor Bill Bengen in 1994, who analyzed historical return data for balanced portfolios (60% stocks, 40% bonds) in the United States. His conclusion: a retiree could withdraw 4% of the initial capital adjusted for inflation annually for 30 years without depleting the funds. However, in December 2026, Bengen warned in an interview with Diario AS that "early retirees may be fooling themselves", noting that the rule was designed for traditional retirements at age 65, not for 50- or 60-year horizons. This nuance is key for those seeking financial independence before age 50.
Is It Still Valid? Adaptations and Criticisms
The 4% rule has been questioned due to low real bond yields in the last decade and recent inflation. Studies like Fintualist (2026) suggest that in emerging markets like Mexico, the safe rate could rise to 6-7%, but with higher volatility. In Spain, the AIReF warned in March 2026 that the sustainability of the public pension system has not improved despite meeting the spending rule, reinforcing the need for supplementary savings plans. The original rule assumes constant withdrawal, but many experts recommend a dynamic rate based on market performance. You can find related concepts in our glossary.
Real Examples: Leif Dahleen, José Elías, and the €200,000 Rule
Cases like Leif Dahleen, who achieved financial independence at 43, show it is possible with savings discipline and investment in equities. On the other hand, entrepreneur José Elías popularized the idea that €200,000 well-invested can generate income to avoid depending on a job—a simplified version of the 4% rule. However, both profiles assume high market risk and do not consider health or longevity surprises. The key is to personalize the target based on expenses, horizon, and risk tolerance. To delve deeper into how these thresholds are calculated, visit our methodology page.
The Context of Pensions in Spain and the Need for Complements
The debate on financial independence gains traction in Spain amid uncertainty about the public system. AIReF has noted that even if the spending rule is met, long-term sustainability is not guaranteed. This pushes many to seek passive income through stock market investment, index funds, or real estate. The 4% rule serves as a guide but must be adjusted to each country's fiscal and inflation reality. It is advisable to combine multiple income sources and not base all retirement on a single strategy. The sources used for this analysis are listed in our data section.
Sources and Methodology
This article is based on news and reports published between 2020 and 2026, including interviews with Bill Bengen (Diario AS, 2026), the case of Leif Dahleen (Rankia), José Elías' €200,000 rule (ABC), Fintualist's analysis of the rule in Mexico, the AIReF warning, and the interview with Homo Investor (El Blog Salmón). The information is presented without predictive intent and for educational purposes. For more details on how we handle data, see our methodology.
Disclaimer: Informational content. This does not constitute financial advice.