Inflation can erode the purchasing power of retirement savings and complicate financial planning for retirees. William “Bill” Bengen, a financial adviser best known for developing the 4% rule for retirement withdrawals, warns that the strategy must be adapted to each retiree’s economic and personal circumstances. Bengen first published his research in October 1994 in the Journal of Financial Planning. He was working as a financial adviser at the time and sought to answer a key question for his clients: how much could they withdraw each year during retirement without depleting their savings too quickly? The resulting 4% rule remains a widely cited benchmark for retirement planning. The original method proposes withdrawing 4% of the accumulated capital in the first year of retirement and adjusting that amount each subsequent year for inflation. It does not mean taking 4% of the portfolio balance annually; rather, it aims to preserve the purchasing power of an initial withdrawal amount. Bengen argues that inflation is the “greatest enemy” of retirees because persistent price increases can reduce the real value of savings and cause a portfolio to run out of money sooner than expected. He notes that the problem is especially acute when high inflation coincides with a decline in equity markets at the start of retirement. In such a scenario, withdrawing from a portfolio that has already fallen in value can make it harder for the investments to recover. A June 2025 survey by the Nationwide Retirement Institute found that 63% of retirees feared that rising fees would push inflation above the adjustments applied to their benefits. In July 2025, the U.S. Consumer Price Index recorded an annual increase of 2.7%, according to data cited by CNBC. Bengen’s original study identified a historical maximum withdrawal rate of about 4.15% for the first year, based on a portfolio of 60% stocks and 40% bonds, a 30‑year planning horizon, and annual rebalancing. More recent calculations have raised that figure to 4.7%, a rate he calls Universal Safemax. He also noted that, under certain historical conditions, some retirees could have sustained higher withdrawal rates. These figures are not guarantees for the future; outcomes depend on market performance, inflation, portfolio composition, and the length of the retirement period. Bengen stresses that there is no one-size-fits-all strategy. Decisions should take into account available income, taxes, investment allocation, life expectancy, and the desire to leave an inheritance. To mitigate inflation risk, he recommends acting quickly if prices rise significantly, such as reviewing budgets and cutting expenses to prevent withdrawals from eroding the accumulated capital too rapidly.
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