Unnerved by market swings, a 66-year-old single retiree has roughly 90% of her $1.7 million portfolio parked in cash and short-term bonds. The portfolio feels safe and sleep comes easier. That comfort has a potential price tag — roughly $39,000 a year in foregone returns.
How do we reach this number? Here’s our scenario: Roughly $1.53 million of the $1.7 million portfolio is sitting in cash and short-term bonds yielding about 2%. A balanced allocation, with more stock exposure, would be appropriate for a 25- to 30-year retirement horizon, according to most advisors. Such a bucket would reasonably target mid-single-digit annualized returns. The gap works out to roughly $39,000 per year in forgone returns, compounded across a horizon that could easily stretch into the retiree’s mid-90s.
Cash Feels Safe, but Inflation Drains It
Inflation is the quiet drain. A 2% cash yield in a 3%-plus inflation world is a negative real return every year. Over 25 years, that compounds into meaningful lost purchasing power on $1.7 million.
The yield environment sharpens the cost. The FDIC national average 12-month CD is at 1.7%, while the Treasury market pays more up the curve: roughly 4.0% at six months, 4.2% at five years, and 4.5% at ten years. I-Bonds currently pay a 4.3% composite rate with a 0.9% fixed component. Even inside “safe,” there is a wide spread between what a retiree could earn and what they are earning.
Stretch to a balanced allocation and the arithmetic gets better. The S&P 500 has returned roughly 255% over the past 10 years, a period that included a pandemic crash, a 2022 bear market, and a regional banking scare. A retiree who held even 40% equities through all of it captured the growth without the drawdown of a full stock portfolio.
The Real Risk Shows Up at 88
Reframe the risk. For a 66-year-old, the real danger arrives at 88. By then, you could end up with a portfolio that has lost a third of its purchasing power to inflation and can no longer support the same lifestyle. The BLS Consumer Expenditure Survey pegs average annual household spending at $78,535 in 2024. A retiree spending in that range needs the portfolio to grow, not just sit.
Run your own numbers on how a different withdrawal and allocation profile changes the outcome:
The bucket strategy is one way to fix this while still being cautious. Carve out two to three years of spending, roughly $150,000 to $225,000, and hold it in high-yield savings, T-bills, or short CDs. That is the sequence-of-returns buffer. The next bucket, five to seven years of spending, sits in intermediate bonds and I-Bonds. The remainder, comfortably more than half the portfolio, goes to a diversified stock allocation for the 15-to-30-year money.
Here are two steps for setting this up:
- Define the cash buffer with a number, not a feeling. Pick a spending figure, multiply by two or three years, and cap the cash allocation there. Everything above that is long-term money, and holding it all in 1.7% CDs probably doesn’t make sense.
- Rebuild equity exposure on a glide path, not in one trade. Move a set percentage each quarter over 12 to 24 months. This removes the temptation to time the market and prevents the “bought the top” regret that would send the retiree back to cash the next time the S&P dips.
Our hypothetical retiree’s conservative portfolio is an active bet that cash beats a diversified portfolio over the next 25 years. With the Fed Funds rate already cut to 3.8% and cash yields drifting lower, that bet is getting worse, not better. If the estate is likely to pass to heirs, the case for growth is stronger still, because the money has a horizon longer than the retiree’s own life expectancy.
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