What Actually Breaks Retirement Plans
When I run this stress test for a client, the thing that ends the conversation about averages is always the same picture. Two retirees, identical portfolios, identical withdrawals, and returns that average out to exactly the same number over 30 years. One of them finishes with more than double what they started with. The other runs out of money in their early eighties. Same averages. Different order.
That is sequence of returns risk, and it is the single most underweighted idea in retirement planning. The average return your spreadsheet shows you is a summary of 30 individual years, and the summary hides which years came first. A saver who is still accumulating can shrug at a bad decade, because they are buying, not selling. A retiree cannot. A retiree is selling every year to fund spending, and when the bad years arrive early, the sales happen at the bottom. Those shares are gone before the recovery arrives, and no later rally restores them. The loss is structural, not temporary.
The Experiment
Everything modeled in this article is a hypothetical projection for illustration, not a prediction of returns, not a loan offer, and not financial advice. Your sequence will be its own animal.
Two hypothetical retirees, both 65, both start with $1.5M. Both withdraw $60,000 in year one, and both adjust that withdrawal for 3 percent inflation each year, which is what a real spending plan does. Both earn an average of exactly 6.8 percent per year across 30 years.
The good order opens with a decade averaging 12 percent, then coasts at 4.2 percent. The bad order opens with three negative years, down 20, then 14, then 10 percent, recovers modestly, gets hit again in years eight through ten, and only then begins its long stretch of above average years. Both sequences average 6.8 percent. Here is what each is worth as the years go by.
| Years into retirement | Good order | Bad order |
|---|---|---|
| 1 | $1.61M | $1.15M |
| 5 | $2.19M | $0.77M |
| 10 | $3.34M | $0.36M |
| 16 | $3.87M | $0, money gone |
| 30 | $4.32M | exhausted 14 years earlier |
Read the bad order column slowly, because this is the part people feel in their chest. By year ten the bad order retiree has about a quarter of the good order’s balance, not because they spent more or earned less on average, but because their withdrawals came out of a shrinking portfolio in the years it hurt most. Their year 16 is the whole ballgame. The money is gone at 81. The good order retiree is worth $3.87M at that moment and finishes the 30 years at $4.32M. Identical averages, opposite retirements.
Enter the Volatile Asset
Now layer on the question I get asked most: what about Bitcoin. When I model a 5 percent Bitcoin allocation against a 95 percent portfolio, the honest result cuts both ways. Over long horizons the sleeve raises the modeled average return, because a scarce, adoption-driven asset compounds hard in good cycles. But it widens the bad sequence, because its drawdowns are deeper and faster than anything in the stock market. A 55 percent Bitcoin drawdown inside a 5 percent sleeve trims roughly 2.75 percentage points off that year’s total return, and if that lands in year one or two of retirement, the forced-sale math above gets worse, not better.
The conclusion I draw from the model is not to drop the allocation. It is that a volatile sleeve and a sequence problem cannot be solved by willpower, they are solved by having somewhere else to take spending from while the drawdown works itself out. Position sizing answers how much risk. A buffer answers when you are forced to realize it.
The Home Equity Buffer
The buffer idea is simple to state. Position two to three years of spending somewhere you can reach it without selling your portfolio, so that a bad opening sequence never forces a sale. There are three ways to do it, and I have modeled all of them, because each one buys safety with a different currency.
| Variant | Portfolio stays fully invested? | Covers a 3-year drawdown? | What it costs |
|---|---|---|---|
| No buffer | Yes | No | Forced sales at the bottom, the exact failure above |
| Cash bucket | 3 years of spending sits in cash | Yes | Roughly $465K of forgone growth over 25 years, modeled at a 4% cash yield versus the 6.8% portfolio return |
| Standby line of credit | Yes | Yes | Opening costs near $15K to $20K, plus interest only on what is actually drawn |
The cash bucket is the conventional answer, and it works, but look at what it quietly gives up. Parking about $185K, three years of spending, in cash earning 4 percent instead of the portfolio’s modeled 6.8 percent costs roughly $465K of forgone growth across a long retirement. You are pre-paying your own insurance premium with compounding you never get back.
The standby line is a Home Equity Conversion Mortgage line of credit, opened against your home and left undrawn. A HECM, the FHA-insured form of reverse mortgage, requires that you be 62 or older, and the line sits there unused, available when needed. Two features matter here. Interest accrues only on the amount you actually draw, so an unused line costs nothing month to month beyond the fees to establish it. And the unused portion of the line grows over time, at roughly the loan’s interest rate, so the buffer you open in year one is bigger by the time a crisis needs it. The cash bucket spends down; the line grows. I walked through a full case study of this mechanic with a Boca Raton couple on Monday, including the two-path math on a $538K portfolio.
The Honest Costs of the Line
I will not pretend the line is free, because the bad-order retiree above is exactly the person a lazy pitch would target. Opening a HECM line carries an upfront mortgage insurance premium of 2 percent of the loan’s maximum claim amount, an origination fee capped by HUD, and third party closing costs that commonly land the all-in opening figure between $15,000 and $20,000 on a mid-sized line. There is ongoing annual mortgage insurance of 0.5 percent of the balance. Interest on drawn balances runs at whatever the note rate is at the time, and because a reverse mortgage requires no monthly payment, the balance compounds, which is the feature and the danger in the same sentence. The loan is non-recourse, meaning the debt can never exceed the value of the home, and the FHA insurance exists precisely to make that guarantee real. You must keep the home as your principal residence, and you must stay current on property taxes, insurance, and maintenance. HUD approved counseling is required by law before you can sign. That counseling is not a formality, and if a lender treats it like one, walk.
The Guardrails Layer
The buffer only earns its keep if you attach rules to it, because in the moment, selling from a falling portfolio feels like discipline and is actually the trap. The guardrail I model is mechanical: when the portfolio is down more than 15 percent from its high water mark, portfolio sales pause and spending comes from the line. When the portfolio recovers to a new high, sales resume and the line is left alone. No judgment calls in the middle of a drawdown, which is the point. The guardrail converts the buffer from an idea into a system, and systems are what survive bad decades.
Disclosure: I buy and hold my own Bitcoin through River Financial. If you open an account with my referral link, we each earn a small amount of free Bitcoin.
Run Your Own Sequence
The uncomfortable truth about sequence of returns risk is that you will not know which retiree you are until you are a decade in, and by then it is expensive to fix. What you can do is model both orders against your real numbers, with your real home value and your real withdrawal, and see whether the bad sequence survives at all. That is what the Perpetual Retirement Calculator is for. Run the good order for the comfort of it and the bad order for the truth of it.
This article uses hypothetical projections for illustration only. It is not investment, tax, or mortgage advice, not a loan offer, and not a prediction of returns. Reverse mortgage terms, limits, and costs vary by lender, property, and program, and a HECM requires independent HUD approved counseling. Bitcoin is volatile and has repeatedly drawn down more than 70 percent; the model above is a single illustrative path, not a forecast. Tane Cabe, NMLS 78590, Barrett Financial Corp, NMLS 181106.
