The Four Retirement Risks That Actually Derail Income Plans
Selena Teasley · · 8 min read
Most retirement income plans don't fail because of bad investments.
They fail because they weren't built to withstand the right threats.
Longevity, sequence of returns, inflation, and healthcare costs represent the four forces most likely to disrupt a well-constructed withdrawal strategy. Understanding how each one works, and how they interact, is the foundation of any durable retirement income plan.
Longevity Risk: The Problem With Planning to Average
Life expectancy tables give you a median, not a finish line. Per SSA actuarial data, a 65-year-old couple has a 53% chance that at least one of them will live past 90, and a 22% chance that at least one will reach 95. That planning horizon, potentially three decades, is what a retirement income plan actually needs to fund, not the number that appears in a mortality table for individuals.
Most retirement plans are built around an 85-year endpoint. The gap between that assumption and a realistic longevity range is where many plans quietly come undone. A plan calibrated for 20 years of withdrawals faces real structural stress if it runs for 28 or 30. The math matters: adding eight years of distributions to a fixed portfolio is not a rounding error.
For married couples in particular, income planning around a single lifespan understates the problem. Survivor income, especially from Social Security and pensions, often drops significantly when the first spouse dies, while many fixed expenses remain. A plan that accounts for both lifespans, including how benefit structures change at the first death, is a different plan than one that doesn't.
Sequence of Returns Risk: When the Market Moves Against You at the Worst Time
During the accumulation phase, a market downturn is a setback. During the withdrawal phase, it can be something more consequential. Sequence of returns risk is the danger that poor investment returns early in retirement, combined with ongoing withdrawals, will significantly reduce a portfolio's value and limit its ability to recover.
The first decade of retirement is where this risk concentrates most. Portfolio balances are at their peak, withdrawals are beginning, and the compounding effect of selling depressed assets to fund living expenses creates a deficit that positive later-year returns struggle to overcome. Two retirees with identical portfolio sizes, identical average returns, and identical withdrawal amounts can end up in very different financial positions depending solely on the order in which good and bad years arrive.
Sequence of returns is the reason average annual return is a misleading metric for someone drawing income. When withdrawals are happening continuously, the timing of losses matters as much as the magnitude.
Morningstar's 2026 State of Retirement Income research puts the base-case safe starting withdrawal rate at 3.9% for a 30-year retirement, assuming portfolios with 30% to 50% in equities and a 90% probability of funds remaining. Portfolios with higher equity concentrations generally did not support higher starting withdrawal rates precisely because the added volatility increases sequence risk. That finding runs counter to the intuition that more growth assets always translate to more income capacity.
Inflation Risk: What a Long Retirement Does to Purchasing Power
A retirement that spans 25 to 30 years is long enough for even moderate inflation to reshape purchasing power meaningfully. The mathematical reality of compounding price increases over decades means that a dollar of income at 65 may cover substantially less at 80, particularly for categories (healthcare being the most prominent) where cost increases have historically outpaced general inflation.
Fidelity's 2025 Retiree Health Care Cost Estimate found that a 65-year-old retiring this year can expect to spend an average of $172,500 on healthcare and medical expenses throughout their retirement. That figure represents a 4% increase from 2024 and reflects the compounding effect of longer lifespans and healthcare inflation that has persistently exceeded the broader Consumer Price Index.
Fixed income sources, a pension with no cost-of-living adjustment, for instance, or a portfolio withdrawal calibrated to today's spending, can lose real purchasing power gradually and without obvious warning. The danger is not a sudden shortfall but a slow erosion that becomes visible only when spending needs have already outpaced income capacity. Retirement income plans that incorporate inflation adjustments and account for the higher cost trajectory of healthcare are structurally more resilient than those that do not.
Healthcare and Long-Term Care Risk: The Expense That Disrupts Everything Else
Healthcare costs in retirement are not just an inflation problem. They are a utilization problem. Most people require more healthcare as they age, which means the spending trajectory is upward on two axes simultaneously: rising unit costs and rising consumption. Long-term care adds a third dimension: the potential for a large, concentrated expense that arrives unpredictably and can last for years.
According to the U.S. Department of Health and Human Services, nearly 70% of individuals aged 65 and older will need long-term care at some point. The financial implications of an extended care event, whether at home, in an assisted living community, or in a skilled nursing facility, can disrupt withdrawal strategies, deplete savings earmarked for a surviving spouse, or force the liquidation of assets in a down market.
This risk intersects with sequence risk in a particularly damaging way. A significant long-term care expense forces large, concentrated withdrawals at a specific point in time. If that point coincides with a market downturn, the combination can produce an outcome that neither risk would generate independently. Planning for this possibility, through insurance, dedicated reserves, or structured income sources, is a separate discipline from standard withdrawal planning, and it deserves to be treated as one.
How These Risks Interact
The reason these four risks are worth examining together is that they do not arrive independently. A longer retirement increases exposure to both healthcare costs and market volatility. A poor market environment in early retirement amplifies the impact of a health event that forces outsized withdrawals. Inflation compounds across all of them. A plan designed to withstand any one of these risks in isolation may still be brittle when two or three converge.
The practical implication for retirement income planning is that resilience requires structure, not just accumulation. Sources of income that are not dependent on portfolio performance, Social Security optimization, pension income, certain insurance products, provide a floor that portfolio withdrawals can supplement rather than replace entirely. Flexible withdrawal strategies that reduce distributions during down markets can preserve principal during the years when sequence risk is most acute. Explicit reserves or coverage for long-term care separate that risk from the general portfolio.
None of these strategies eliminates uncertainty; they manage exposure to it. The goal of a well-constructed retirement income plan is not to predict which risk will materialize, but to build a structure that can absorb the combination that does. Every strategy carries its own tradeoffs, and the right design depends on factors specific to each person's income sources, tax situation, health profile, and objectives.
Common questions
What is sequence of returns risk and why does it matter most early in retirement?
Sequence of returns risk is the danger that poor investment returns early in retirement, combined with ongoing withdrawals, will significantly reduce a portfolio's value and limit its ability to recover. It concentrates in the first decade of retirement because portfolio balances are largest then, and selling depressed assets to fund withdrawals creates a deficit that later recoveries may not fully offset.
How much should retirees realistically budget for healthcare costs?
Fidelity's 2025 Retiree Health Care Cost Estimate found that the average 65-year-old retiring in 2025 can expect to spend $172,500 on healthcare and medical expenses over the course of retirement. That estimate does not include potential long-term care costs, which represent a separate and potentially substantial expense for roughly 70% of people over 65, according to the U.S. Department of Health and Human Services.
Is the 4% withdrawal rule still a reliable starting point for retirement planning?
The 4% rule is a useful historical reference, not a fixed prescription. Morningstar's 2026 State of Retirement Income research puts the base-case safe starting withdrawal rate at 3.9% for a 30-year retirement with a 90% probability of success, and notes that individual factors such as asset allocation, spending flexibility, and life expectancy all move that number. A longer retirement horizon, higher equity concentration, or inflexible spending pattern can each lower the sustainable rate.