Eight hundred thousand dollars sounds like a lot. For a single retiree in 2026, it buys a livable retirement, but not a comfortable one without careful management. The math is tighter than most people expect.

The standard starting point for retirement withdrawals is the 4% rule, which suggests pulling 4% of your portfolio in year one and adjusting for inflation each year after. On $800,000, that produces $32,000 annually, or roughly $2,667 per month. Before Social Security, that is the ceiling, not the floor.

Social Security changes the picture meaningfully. The average monthly benefit for a retired worker is approximately $1,907 as of early 2026. Combined with portfolio withdrawals, a single retiree could realistically work with $4,500 to $5,000 per month in total income, depending on claiming age and benefit history.

That income has to cover everything: housing, healthcare, food, and any discretionary spending. Healthcare spending across U.S. households rose steadily throughout 2025, from $3,432.2 billion in January to $3,694.9 billion by December. At the individual level, retirees without employer coverage typically spend $500 to $800 per month on premiums and out-of-pocket costs before Medicare eligibility at 65, and costs do not drop dramatically after enrollment.

The CPI index has climbed steadily from 319.785 in March 2025 to 326.588 by January 2026, sitting at the 90th percentile of historical levels. Every dollar withdrawn today buys less than it did two years ago, and that erosion compounds over a 25 to 30 year retirement horizon. An $800,000 portfolio that is not growing faster than inflation is quietly shrinking in real terms.

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The 10-year Treasury currently yields 4.09%, which means a conservative bond-heavy portfolio can generate meaningful income without taking significant equity risk. That yield environment is more favorable than it was for retirees in the 2010s, when rates sat near zero.

Three factors matter more than anything else: housing costs, healthcare trajectory, and withdrawal discipline. A retiree with no mortgage and Medicare coverage is in a fundamentally different position than one paying rent and managing chronic conditions.

The clearest mistake to avoid is withdrawing above 4% in the early years of retirement. Sequence-of-returns risk, where poor market performance early in retirement permanently impairs a portfolio, is the most underappreciated threat to an $800,000 nest egg. Holding 12 to 18 months of expenses in cash or short-term bonds provides a buffer that lets equity positions recover without forced selling.

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