That beats, time-wise, the Guyton-Klinger Guardrails Approach by 6 years. Resetting your initial withdrawal rate in good times is a reasonable approach, but what do you do in down years?
The Guardrails Approach covers both.
It has five rules that define how much one can draw annually:
- Initial withdrawal rate: The Guyton-Klinger model says 99% of retirees can start with an initial draw rate of 5.2%-5.6%.
- Upper guardrail: If the portfolio withdrawal rate falls 20% lower than the initial rate due to increases in the portfolio value, increase dollar withdrawals by 10%. This is known as the “Prosperity Rule.”
- Lower guardrail: If the portfolio withdrawal rate rises 20% higher than the initial rate due to poor investment performance, reduce dollar withdrawals by 10%. This is known as the “Capital Preservation Rule.”
- Inflation adjustments: Based on the Consumer Price Index, up to a 6% annual increase.
- Longevity: If & when you expect to have 15 years or less remaining, you remove the lower guardrail rule.
These adjusted strategies are really just ways, in my opinion, to codify a common-sense approach to retirement withdrawals. But, they all assume you have some leeway in being able to withdraw less during certain down years. The sole advantage of the plain ole’ 4% SWIR is that if you need all that money to live on, you’ll get that same money, adjusted for inflation, every year. But, if you’ve got some discretionary spending in retirement, as I would hope most Fools do, then I feel it’s too restrictive and you’ll end up retiring with a ton of money for your heirs.
Just basic math is that if you have a portfolio that only matches inflation, then the 4% rule will mean your portfolio will last 25 years. Now, the S&P 500 beats inflation, on average, by 6%-7% each year (that’s above inflation returns).
Of course, and as has been mentioned above, the problem is the Squence of Returns risk. And for this, keeping enough cash or bonds in the portfolio is important so that you’re not selling your depreciated assets at their lows, which would mean you have less invested for the eventual recovery. But, I personally feel the 40% bond rule, or anything even half as much, is overly conservative. You might only need 3-5 years worth of withdrawals in bonds or cash to survive almost all bad markets, IMO anyway.
One problem I have with almost all of these strategies is that they typically don’t account for real-world retirement spending. Many retirees spend less as they age. This makes sense - you have less energy so big travel trips are fewer and/or shorter. Kids are adults earning their own way. You don’t take up new home remodeling projects, go skiing, etc. Unfortunately, as Charlie Munger mused about years ago, people who saved for years end up not being able to spend in retirement, at least until it’s physically too late.
I’ve not seen a strategy that accommodates this well. It would seem to go against all the caution that most strategies have. But, at least when you look at the probabilities of running out of money, know that you’ll spend less money at 86 than you did at 66 without it really bothering you, at least if your 66 retirement has some discretionary income.