The Risks of a Single-Fund S&P 500 Strategy for Retirement

For many nearing retirement, the temptation to simplify an investment portfolio by going 'all-in' on an S&P 500 ETF is high. However, financial experts warn that while the S&P 500 has historically provided strong returns, it lacks the diversification necessary to weather the specific risks of the retirement phase, such as sequence-of-returns risk. Relying solely on large-cap U.S. stocks can expose a retiree to significant volatility at exactly the moment they need to begin withdrawals.

A successful retirement strategy typically requires a more nuanced approach, balancing growth with capital preservation. This often includes a mix of international equities, small-cap stocks, and fixed-income assets. By diversifying across asset classes, investors can create a smoother ride, reducing the likelihood of being forced to sell shares during a market downturn to fund living expenses.

The 'all-in' approach also ignores the role of bonds and cash equivalents in providing a safety net. For those with a 30-year retirement horizon, the goal is not just to maximize absolute returns, but to maximize the probability that the money lasts as long as the retiree does. Professional planners suggest that while an S&P 500 fund can be a core holding, it should rarely be the only holding for those in or near retirement.