Sequence Risk and Withdrawal Strategies

Why order matters only when you withdraw

Two portfolios, both averaging 7% over 20 years. One earns +25% early and −15% late; the other reverses it.

• Accumulating: identical end values. Multiplication is commutative, so the sequence is irrelevant.
• Withdrawing €40,000 a year: the portfolio hit early is selling shares into low prices at exactly the moment its balance is largest, permanently removing capital that would otherwise have compounded through the recovery. The one hit late has already banked its growth and withdraws through the fall from a bigger base.

Same average, different outcome, sometimes by a decade of sustainable spending. That is the whole of sequence risk in one comparison.

The corollary defines the danger zone: the roughly five years either side of your retirement date, when the portfolio is at its largest and the withdrawal machine is starting. A −40% market at 63 is a materially different event from the same market at 43 or 83.

The 4% rule, correctly understood

Bengen's 1994 work and the Trinity Study found that a retiree withdrawing 4% of the initial portfolio, adjusted annually for inflation, would have survived every historical 30-year US period. That research is genuinely important and routinely misused.

What it actually is: a historical stress test of a mechanical rule, on US data, over 30 years, with a specific stock-bond mix, ignoring fees and taxes.

Why it is a poor operating instruction:

• It ignores fees and taxes, which are yours to subtract.
• Non-US markets did worse. Global evidence (Dimson–Marsh–Staunton and successors) gives safe rates below 4% in many countries. US survivorship is doing quiet work in the headline number.
• Nobody actually spends that way. Real retirees spend more in early active years, less later, and adjust when markets fall. The rule assumes a robot who raises spending into a crash.
• It optimises the wrong thing. Surviving 30 years with €1 left counts as success; dying with an unspent fortune also counts. Neither is the goal.

The honest use: 4% (or a bit less outside the US) is a planning anchor for how much capital a given lifestyle needs, and a starting rate. It is not a rule to obey through a bear market.

The three structural defences

1. The cash and short-duration buffer. Hold two to five years of spending in money-market and short-duration instruments (Chapter 44) plus target-maturity bond funds for dated needs (Chapter 43). Purpose: when equities fall 35%, you spend from the buffer and simply do not sell equities at the bottom. This single structure removes most of sequence risk's teeth, and it is the practical form of Chapter 62's glidepath view: the calm sleeve exists to be spent, not to rally.

Sizing is a judgement: two years is lean but workable with flexible spending; five years covers the long recoveries at the cost of holding more low-return assets. Refill the buffer in good years, from the overweight asset.

2. Flexibility in the withdrawal rule. Rules that flex with markets survive far better than fixed ones:

• Guardrails (Guyton-Klinger style): set an initial rate, then cut spending modestly if the withdrawal rate rises past a ceiling after bad years, and allow raises after good ones. Historically supports meaningfully higher initial rates than the fixed rule because it stops digging in a hole.
• Percentage-of-portfolio: withdraw a fixed % of the current balance. Never runs out mathematically, but income swings with markets: usable with a large buffer and discretionary spending.
• Floor-and-upside: cover essential spending with guaranteed sources (state pension, annuity, bond ladder), and take the variable withdrawal only from the portfolio for discretionary spending. Arguably the most robust structure available, and the one that lets people sleep.

The finding underneath all three: small, early spending adjustments are worth more than any portfolio optimisation. Cutting 10% of discretionary spending for two years after a crash does more for portfolio survival than any asset-allocation tweak available.

3. Withdraw from the overweight. Take each withdrawal from whichever asset is above its target (Chapter 63 in reverse). Spending becomes rebalancing, free of trading costs and often tax-advantaged, and it mechanically means selling what has done well rather than what has just crashed.

Order of withdrawals across account types

Alongside what to sell sits which account to sell from, and the answer is jurisdictional. The universal principles:

• Spend from the account whose tax cost is lowest this year, considering that later years may differ; smoothing income across brackets often beats depleting one account first.
• Preserve the tax-free wrapper for last where it grows untaxed and passes well (a Roth in the US, an ISA in the UK), because its advantage compounds longest.
• Watch forced distributions (US RMDs) and deemed disposals (Ireland's eight-year rule), which remove the choice from you.
• Coordinate with pension start dates: a gap year before state pension often creates a low-income window worth filling deliberately.

Details are national: Chapters 28–29 for the wrappers, 52–53 for the tax mechanics.

A worked example

Elena retires at 65 with €800,000 and needs €32,000 a year (4%) on top of a state pension covering essentials.

• Structure: €96,000 (three years) in money-market and short-duration funds; €120,000 in target-maturity bond funds for years 4–7; €584,000 in a global equity fund. That is a 73/27 allocation, presented as buckets for clarity.
• Year 2: markets fall 38%. Equity sleeve drops to about €360,000. She spends from the buffer, sells no equities, and, because her essentials are covered by the pension, cuts discretionary travel spending by €4,000 for two years.
• Years 4–6: recovery. Equities regain their level; she refills the buffer from the now-overweight equity sleeve, which is Chapter 63's rebalancing wearing a different hat.
• Outcome: the crash that would have forced a fixed-rule retiree to liquidate roughly 12% of her equity holdings at the bottom instead required her to sell nothing and postpone one trip.

Her neighbour, same portfolio and no buffer, sold equities each quarter through the decline on a rigid inflation-adjusted schedule, and permanently removed capital that never participated in the recovery. Identical markets, identical average returns, and the difference was three years of cash and a willingness to defer a holiday.