Sequence of Returns Risk: The Biggest Threat to Your Retirement Income

Most investors focus on average returns when planning for retirement. "If my portfolio returns 6% per year on average over 30 years, I should be fine." This reasoning is dangerously incomplete. What matters in retirement is not just the average return, but when those returns occur. A period of poor returns in the early years of retirement — even if perfectly offset by strong returns later — can permanently and irreversibly deplete a portfolio. This is sequence of returns risk, and it is the most consequential financial risk facing retirees who draw income from invested assets.

The Mathematical Reality

To understand why the sequence of returns matters, consider two investors who retire on the same day with identical £500,000 portfolios and draw £25,000 per year (5% initial withdrawal rate). They experience identical sets of annual returns over 20 years — but in opposite order.

Investor A experiences the bad years first: five years of -10% returns, then fifteen years averaging +12%.

Investor B experiences the good years first: fifteen years averaging +12%, then five years of -10%.

Despite identical average annual returns over 20 years, Investor A may exhaust their portfolio entirely, while Investor B ends with a substantial balance. The asymmetry is stark and is caused by the combination of negative returns and ongoing withdrawals during the early years: when the portfolio is at its largest, the losses are most damaging in absolute terms.

This is categorically different from the experience of an investor still in the accumulation phase. Someone who suffers a bear market at age 35 continues contributing regular amounts and benefits from lower prices on new investments. The bear market actually enhances their long-term returns by enabling them to buy more units cheaply. A 65-year-old drawing £25,000 per year does the opposite: they are forced sellers at low prices, locking in losses permanently.

Why the Early Years Are Most Critical

Sequence of returns risk is not uniformly dangerous throughout retirement. It is highest in the early years — typically the first five to ten years of retirement — for two reasons:

Portfolio size: at the point of retirement, the portfolio is typically at its largest. A 20% market decline in year one of a £1 million portfolio is a £200,000 loss. A 20% decline in year 20, when the portfolio may have grown to £1.5 million or shrunk to £400,000 depending on withdrawals, has a very different impact.

The "point of no return" dynamic: if a portfolio suffers a severe bear market very early in retirement and withdrawals continue, the portfolio may drop to a level from which it cannot recover even with subsequent strong returns. The compound growth that strong later-year returns generate is applied to a smaller base — the shortfall becomes self-reinforcing.

Research by financial planners in the United States ("safe withdrawal rate" studies, originating with the Trinity Study in 1998 and updated many times since) consistently finds that the "safe" withdrawal rate — the rate at which a portfolio is statistically likely to survive a 30-year retirement — is in the range of 3 to 4%, depending on asset allocation and historical return assumptions. These studies implicitly capture sequence of returns risk in their Monte Carlo simulations.

Who Is Most Vulnerable?

Sequence of returns risk is specifically a problem for:

• Drawdown pensioners: retirees who have not purchased an annuity and are drawing income from a defined contribution pension pot, a SIPP, or an investment portfolio.
• People who retire at market peaks: retiring at the top of a bull market is the worst possible timing from a sequencing perspective. The portfolio is full, but it is also fully priced. A subsequent market correction combined with ongoing withdrawals is maximally destructive.
• Those with high withdrawal rates: the higher the withdrawal rate relative to the portfolio, the greater the sequence of returns risk. A 2% withdrawal rate is almost immune to sequencing; a 6% withdrawal rate is highly vulnerable.
• Investors with undiversified portfolios: a highly concentrated or volatile portfolio amplifies sequence risk relative to a broadly diversified one.

Strategies to Mitigate Sequence of Returns Risk

There is no single perfect solution to sequence of returns risk. Multiple strategies exist, each with different trade-offs in terms of cost, flexibility, and protection.

Cash Buffer

The simplest strategy: hold one to two years of living expenses (after guaranteed income from state pension, defined benefit pension, annuities, etc.) in cash or short-term deposits. During a market downturn, draw from cash rather than selling depressed equity holdings. This interrupts the forced-selling dynamic that makes sequencing dangerous.

The cash buffer is a straightforward, low-cost mitigation. Its limitation: it delays but does not eliminate the problem. If the bear market lasts three years (as 2000-2003 and 2007-2009 both did), a two-year cash buffer is insufficient on its own.

The Bucket Strategy

The bucket strategy extends the cash buffer concept into a structured framework:

• Bucket 1 (0-3 years): cash and cash equivalents; meets near-term income needs; drawn from first.
• Bucket 2 (3-10 years): medium-term bonds and income assets; replenishes Bucket 1 as it is drawn down.
• Bucket 3 (10+ years): global equities and growth assets; provides the long-term return that ultimately sustains the income.

The bucket structure provides psychological as well as financial benefit: the investor can see that their near-term needs are funded without selling equities, which makes it easier to maintain discipline through market downturns.

Dynamic (Flexible) Withdrawal Strategy

Rather than drawing a fixed monetary amount regardless of market conditions, dynamic withdrawal adjusts spending in response to portfolio performance:

• In years of strong returns: maintain or modestly increase the drawdown.
• In years of poor returns: reduce spending temporarily to preserve capital.

A simple version: set a ceiling (maximum withdrawal) and a floor (minimum withdrawal), and adjust within that band based on portfolio performance. This requires flexibility in spending — which is realistic for many retirees who can distinguish between essential spending (covered by the floor) and discretionary spending (reduced in downturns).

Dynamic withdrawal significantly improves the survival probability of a portfolio over a 30-year retirement relative to a fixed withdrawal rate, at the cost of some spending certainty.

Partial Annuitisation

An annuity provides guaranteed income for life, regardless of investment performance or how long you live. By converting part of a pension pot into an annuity, an investor establishes a floor of guaranteed income to cover essential expenditure, and leaves the remainder invested in a drawdown portfolio for additional income and growth.

The income floor approach: use guaranteed income (state pension + defined benefit pension + partial annuity) to cover non-negotiable costs (housing, food, utilities). The drawdown portfolio then only needs to generate discretionary income. With lower withdrawal demands on the drawdown portfolio, sequence of returns risk is substantially reduced.

Annuities are not universally appropriate: they require relinquishing control of capital; they provide no bequest value; and the rate locked in depends heavily on prevailing interest rates (which were historically low 2010-2021 and much more attractive post-2022). But as a partial hedge against sequence risk and longevity risk, a partial annuity is worth serious consideration.

Liability-Matching

For very wealthy investors, a more sophisticated approach: match assets to liabilities by duration. Near-term spending needs (years 1-5) are matched to cash and short-term bonds; medium-term needs (years 5-20) to intermediate bonds and income assets; long-term (20+ years) to equities and real assets. Rebalancing occurs mechanically as the liability buckets are consumed.

This is essentially the institutional pension fund approach, applied to personal finance. It requires more active management and a clearer understanding of spending needs than simpler approaches.

The Retirement Timing Problem

Research confirms an uncomfortable truth for retirement planners: the single most important determinant of retirement success (whether the portfolio survives a 30-year withdrawal period) is the market return in the first five years of retirement. Retiring just before a major bear market (2000 or 2007, for example) is significantly more damaging than retiring during or just after one.

This creates a paradox: the decision about when to retire (life stage, career, personal choice) is largely disconnected from the optimal financial timing. Few people can afford to wait for a bear market before retiring.

The practical response: if retiring at a market high valuation, build in larger buffers (more cash, lower initial withdrawal rate, earlier partial annuitisation) precisely because the sequencing risk is elevated. Conversely, if retiring during or after a market downturn, the sequencing risk is reduced — valuations are lower, expected future returns are higher, and the portfolio is buying assets cheaply.

This guide is for information purposes only and does not constitute financial advice. Retirement income planning is complex and depends on individual circumstances. The value of investments can fall as well as rise; there is no guarantee of income in retirement. Past performance is not a reliable indicator of future results. Seek professional independent financial advice.

How Global Investments Can Help

Global Investments takes a structured, evidence-based approach to retirement income planning, explicitly modelling sequence of returns risk for each client's specific situation. We can help design a drawdown strategy that appropriately mitigates sequencing risk — whether through cash buffers, bucket structures, partial annuitisation, or dynamic withdrawal — and integrate it with your pension, ISA, property, and other income sources to provide a coherent retirement income plan. Contact our advisory team for a private consultation.