- Sequence of Returns Risk and Retirement Withdrawal Guardrails (you are here)
- Longevity Risk: Why Pooling Makes Insurance Cheaper
A retirement plan rarely fails because the average return was low. It fails because of bad returns early on, rising prices and a longer life than planned. Imagine driving across a desert: running low on fuel at the start of the trip hurts far more than running low near the end. The counters are spending rules that adjust to how your portfolio is doing, income that rises with inflation, planning for a life to age 95, and guaranteed income that covers your essential bills.
Why it matters: A plan that bends with the market and covers the basics is much harder to break.
Summary: A retirement plan fails less from low average returns than from bad returns early, rising prices and a longer life than planned. The counters are spending rules that respond to the portfolio, income that rises with inflation, a horizon to age 95, and guaranteed income under your essentials.
- The same fifteen returns in opposite order left two retirees $635,129 apart; the first decade’s real returns predict the outcome far better than the 30-year average.
- After a 20% loss with 4% withdrawn, the portfolio needs a 30.2% gain, not 25%, to get back.
- At 3% inflation a fixed income loses half its buying power in about 24 years.
- For a 65-year-old couple, the chance that at least one partner reaches 90 is about 51%; to 95, about 21%.
- Guardrails trade a variable income for a higher, safer starting rate; a floor of guaranteed income keeps cuts away from necessities.
Saving for retirement has one dominant risk: not saving enough. Spending in retirement has four, and they interact. Sequence-of-returns risk is the danger that bad markets arrive early, while you are already withdrawing. Inflation risk is the slow loss of what each dollar buys. Longevity risk is the chance of living longer than the plan assumed. The fourth is behavioral: holding spending fixed when the portfolio is signaling that it can’t sustain it. This section takes each in turn, with numbers, and then covers three tools for managing them — guardrails, buckets, and a guaranteed floor.
The mechanism behind sequence risk is simple. While you are saving, the order of returns does not change where you end up: a fixed sum multiplied by the same set of returns produces the same final value in any order. Once you are withdrawing, it does. Money taken out after a crash has to be sold at low prices, and those shares are not there for the recovery. Each year’s arithmetic is:
End-of-year balance = (start-of-year balance − that year’s withdrawal) × (1 + that year’s return)
A loss and a gain of the same percentage do not cancel: after a 20% fall, $1 becomes $0.80, and getting back to $1 takes $1 ÷ $0.80 − 1 = 25%. Withdrawals widen that gap because they shrink the base that has to recover. Withdraw 4% at the start of the year and then lose 20%: $1,000,000 becomes ($1,000,000 − $40,000) × 0.80 = $768,000, and returning to $1,000,000 takes $1,000,000 ÷ $768,000 − 1 = 30.2%, before the next year’s withdrawal. At 5% withdrawn the required gain is $1,000,000 ÷ $760,000 − 1 = 31.6%.
The formula above shows the second half of the mechanism. A withdrawal is a fixed number of dollars, so after a fall it is a larger percentage of what remains: the same $40,000 is 4% of $1,000,000 but 5% of $800,000. Selling more shares to raise the same dollars after prices fall is reverse dollar-cost averaging, the mirror image of the saver’s advantage in Part 7.5. While you save, buying after a fall gets more shares; while you spend, selling after a fall gives up more of them.
Two retirees each start with $1,000,000 and withdraw $40,000 at the start of year one (a 4% initial rate, 10.2), raising the withdrawal 3% a year for inflation. Both experience exactly the same fifteen annual returns — an average of 6.0% — but Retiree A meets them in one order and Retiree B in the reverse order. Year one for A: ($1,000,000 − $40,000) × (1 − 0.18) = $787,200. Year one for B: ($1,000,000 − $40,000) × (1 + 0.09) = $1,046,400.
| Year | Withdrawal | A: return | A: balance | B: return | B: balance |
|---|---|---|---|---|---|
| 1 | $40,000 | −18% | $787,200 | +9% | $1,046,400 |
| 2 | $41,200 | −8% | $686,320 | +9% | $1,095,668 |
| 3 | $42,436 | +2% | $656,762 | +15% | $1,211,217 |
| 4 | $43,709 | +6% | $649,836 | +14% | $1,330,959 |
| 5 | $45,020 | +9% | $659,249 | +11% | $1,427,392 |
| 6 | $46,371 | +4% | $637,393 | +8% | $1,491,502 |
| 7 | $47,762 | +7% | $630,905 | +12% | $1,616,989 |
| 8 | $49,195 | +10% | $639,881 | +10% | $1,724,574 |
| 9 | $50,671 | +12% | $659,915 | +7% | $1,791,076 |
| 10 | $52,191 | +8% | $656,343 | +4% | $1,808,440 |
| 11 | $53,757 | +11% | $668,870 | +9% | $1,912,605 |
| 12 | $55,369 | +14% | $699,391 | +6% | $1,968,670 |
| 13 | $57,030 | +15% | $738,715 | +2% | $1,949,872 |
| 14 | $58,741 | +9% | $741,171 | −8% | $1,739,841 |
| 15 | $60,504 | +9% | $741,927 | −18% | $1,377,056 |
Both withdrew the same $743,957 in total. After fifteen years A holds $741,927 and B holds $1,377,056 — a gap of $635,129 created entirely by timing. Year sixteen’s withdrawal of $62,319 ($40,000 × 1.0315) is 8.4% of A’s portfolio ($62,319 ÷ $741,927) but only 4.5% of B’s ($62,319 ÷ $1,377,056). A is on a path to running out; B can raise spending.
Try it yourself — Withdrawals and the sequence of returns
Defaults: $1,000,000, a first-year withdrawal of $40,000 (4%) that rises 3% a year with inflation, over 30 years. The sequence test runs the same ten annual returns in three different orders.
- Good years first
- $1,154,311Lasts all 30 years
- Bad years first
- $0Runs out in year 28
- Alternating
- $743,242Lasts all 30 years
- Average return, every ordering
- 6.00%compound average over the 10 test years: 4.93% in all three
- Initial withdrawal rate
- 4.00%$40,000 ÷ $1,000,000
How to read this: All three orderings contain exactly the same returns, so their averages match; only the order differs. Losses that arrive early, while withdrawals come out of the portfolio, do lasting damage: shares sold low to fund spending are not there for the recovery. Switch to “Constant return” to see the smooth-average version that hides this risk.
Conventions: each year’s withdrawal comes out at the start of the year (inflation-adjusted from year 2) and the remainder then earns that year’s return; “runs out” means the first year the portfolio cannot pay the full withdrawal. Sequence test: half the window at average + swing, half at average − swing (one year at the average if the window is odd), arranged good-first, bad-first or alternating; after the window every year earns the average. Returns are fixed, not random, so results are reproducible; nominal and before fees and taxes. Illustration only, not a forecast or advice.
The consequence: the first five to ten years of retirement carry most of the risk. A plan that survives a bad first decade usually survives; one that assumes average returns from day one can fail with average returns over thirty years.
Planner and researcher Michael Kitces tested which returns best predict the highest safe withdrawal rate across historical U.S. retirement start dates (Kitces, 2014). The first year’s return predicted little. Real returns over the first ten years had a correlation of 0.79 with the safe withdrawal rate, peaking at 0.81 after nine years, while 30-year compounded nominal returns showed essentially no relationship. A sharp crash followed by a quick rebound did far less damage than a merely mediocre decade, and early inflation hurt as much as weak returns, because it lifts every later inflation-adjusted withdrawal. The practical reading: the five-to-ten-year window after retiring is where flexibility pays, and a crash in year one is not by itself a reason to abandon a plan. These are historical U.S. results, one country’s experience; they describe risk, not a forecast.
Inflation works more quietly. At 3% a year, prices roughly double in 24 years, and a retirement can last 30. The table shows what a fixed $40,000 a year is worth in today’s purchasing power, using today’s value = $40,000 ÷ (1 + inflation)years — for example, $40,000 ÷ 1.0320 = $40,000 ÷ 1.806 = $22,147.
| Inflation rate | After 10 years | After 20 years | After 30 years |
|---|---|---|---|
| 2% a year | $32,814 | $26,919 | $22,083 |
| 3% a year | $29,764 | $22,147 | $16,479 |
| 4% a year | $27,023 | $18,255 | $12,333 |
This is why Social Security’s annual cost-of-living adjustment (10.3) is worth more than its headline number suggests, and why a pension or annuity without inflation adjustment (10.4, 10.10) loses about half its real value within 24 years at 3% inflation (1.0324 ≈ 2.03).
Longevity is the planning horizon itself. Using the Social Security Administration’s period life table, a 65-year-old man has about a 24.1% chance of reaching 90 (19,063 ÷ 79,084 survivors) and a 65-year-old woman about 34.9% (30,504 ÷ 87,399). For a couple of that age, the chance that at least one partner reaches 90 is 1 − (1 − 0.241) × (1 − 0.349) = 1 − 0.759 × 0.651 ≈ 51%. A couple planning only to age 85 is, in effect, betting against better-than-even odds that one of them reaches 90.
Four questions on this chapter. Decide on your answer first, then click “Reveal Answer.”
1. Two people experience the same fifteen annual returns, one in forward order and the other in reverse. In which situation do they finish with the same balance?
- Each withdraws an inflation-adjusted sum at each year’s start
- Each invests one fixed lump sum and withdraws nothing
- Each holds 60% in stocks and withdraws only after good years
- Each withdraws a fixed 4% of the starting balance yearly
Reveal Answer
Answer: B. A fixed sum multiplied by the same returns ends at the same value in any order. Once money comes out, shares sold after early losses miss the recovery, so the order matters: that is sequence risk. (Part 10.7)
2. Suppose a 65-year-old man has a 30% chance of reaching 90 and his wife, also 65, a 40% chance. Treating their lifespans as independent, what is the chance that at least one of them reaches 90?
- 58%
- 35%
- 70%
- 12%
Reveal Answer
Answer: A. At least one = 1 − chance neither does = 1 − (0.70 × 0.60) = 58%. Adding the odds gives 70%, multiplying gives the 12% chance that each does, and averaging gives 35%. Hence planning to 95, not 85. (Part 10.7)
3. A retiree withdraws 5% of the portfolio at the start of the year, and the portfolio then falls 20%. What return is needed to get back to the starting balance?
- 25.0%
- 20.0%
- 30.0%
- 31.6%
Reveal Answer
Answer: D. $1 becomes ($1 − $0.05) × 0.80 = $0.76, and $1 ÷ $0.76 − 1 = 31.6%. 25% is the recovery with no withdrawal, 30% adds the 5% to 25%, and 20% assumes a loss and gain cancel. (Part 10.7)
4. Worked problem: Two retirees start with $800,000 and withdraw $32,000 (4%). One suffers −15% in year one, the other gains 10%. What are their balances after year one?
Reveal Answer
Answer: Retiree A: ($800,000 − $32,000) × 0.85 = $652,800. Retiree B: ($800,000 − $32,000) × 1.10 = $844,800.
- Actuarial life table — Survival odds
- SSA: LatestCOLA
- IRS RMD FAQs