Reverse Equity Glide Slope
Start retirement defensively, then raise equity exposure as liabilities shrink
- Difficulty
- Advanced
- Time to result
- ~ongoing to results
- Steps
- 5
- Confidence
- 93%
The Reverse Equity Glide Slope responds to sequence-of-returns risk by making the opening years of retirement the most conservative phase. Early losses are especially dangerous because withdrawals force the sale of depressed assets and leave less capital available for recovery. The retiree therefore begins with enough stable assets to support near-term spending and a lower equity allocation than might be held later. As the investor moves beyond the first five to ten years, the remaining lifetime liability generally shrinks, reducing the amount of strict liability matching required. Equity exposure can then rise gradually to support later growth, longevity, or bequest goals. The method does not eliminate market risk; it changes when that risk is carried so that the portfolio is least exposed when adverse sequencing would be most destructive.
Origin
Bill Bernstein attributes the quantitative work on the reverse glide slope to Mike Kitsis and Wade Pfau. Extracted from Masters in Business.
Core principles
- 01Early retirement losses cause disproportionate damage.
- 02Near-term liabilities require greater portfolio stability.
- 03Liability-matching needs decline as the remaining horizon shortens.
- 04Equity exposure can rise after the most dangerous sequence-risk years pass.
How to run it
- 1
Measure the early-retirement liability
Estimate essential withdrawals during the first five to ten years of retirement. Account for taxes, inflation, and income from pensions or other dependable sources.
Pro tip Model essential and discretionary spending separately.
Watch out Average withdrawal assumptions can conceal the danger of poor opening-year returns.
- 2
Build the conservative starting allocation
Hold sufficient stable assets to reduce dependence on equity sales during an early downturn. Set the opening equity weight according to the uncovered liability.
Pro tip Align the safe-asset reserve with spending needs rather than an arbitrary percentage.
Watch out Do not interpret conservative as entirely free of inflation risk.
- 3
Use safe assets during equity weakness
Fund withdrawals from the liability-matching portion when equities are depressed. Rebalance according to the written policy when conditions permit.
Pro tip Establish withdrawal and rebalancing rules before retirement begins.
Watch out Repeatedly selling equities after losses compounds sequence damage.
- 4
Recalculate the remaining horizon
Periodically update longevity assumptions, spending needs, health costs, and guaranteed income. Determine how much liability still requires close matching.
Pro tip Review after major spending or health changes, not just annually.
Watch out A shorter horizon does not remove long-term-care or estate obligations.
- 5
Raise equity exposure gradually
Increase the equity allocation as the high-risk opening period passes and the remaining liability declines. Use predetermined increments or allocation bands.
Pro tip Make changes through rebalancing rather than market forecasts.
Watch out Do not accelerate the glide slope merely because equities have recently performed well.
In the wild
A new retiree begins with a conservative allocation and several years of withdrawals matched to stable assets. Equities fall sharply in year two, but living expenses do not require stock sales. After the market stabilizes and the retiree advances beyond the most sequence-sensitive years, the equity allocation is increased gradually.
→ The retiree avoids crystallizing early losses while preserving later growth potential.
Common mistakes
Starting retirement too aggressively
A large early equity loss combined with withdrawals can permanently impair a portfolio even if markets later recover.
Raising equities on a forecast
The glide slope should follow changing liabilities, not a prediction that markets are about to rise.
Ignoring late-life obligations
A shorter expected horizon does not justify aggression if care expenses or bequests remain important liabilities.
Is it for you?
Best for
It is best for retirees whose first several years of withdrawals create substantial sequence-of-returns risk.
Not ideal for
It is not ideal for retirees with fully guaranteed essential income or those whose estate goals require a fixed allocation.
From the transcript
“you actually raise your equity allocation the further into retirement you get”
“your first your first five ten years of retirement, you want to be fairly conservative just for that reason.”
“then you can be more aggressive because you don't need that much of a liability match in portfolio at that age.”
From the episode
Efficient Frontier Advisors Co-Founder & Neurologist Bill Bernstein