Can a Rising Equity Glidepath Save the 4% Safe Withdrawal Rate Over a 60 Year Retirement? (Guest Post by Dr. David Graham)

Welcome back to another guest post. Dr. David Graham, over at FIPhysician has been on a roll. His spike in productivity has been the perfect “hedge” against my drop in productivity while traveling this summer, so when he offered me to write a follow-up on his very well-received guest post a few weeks ago, I was all for it. This current post is about adding a “glidepath” to your retirement portfolio and how and why this would change the success prospects over a 60-year retirement horizon. Over to you, Dr. Graham…

In my last post, I show a 4% Safe Withdrawal Rate (SWR) is actually NOT safe over 60-years (assumptions, assumptions). A more conservative 3.25% SWR does ok. On the other hand, if the asset allocation is increased from 60/40 to 90/10 stock to bond ratio, a 4% SWR thrives again. ERN advises, however, that a 90/10 portfolio sets you up for even more Sequence of Return Risk (SORR). SORR describes the long-term detrimental effects initial negative market returns have on overall portfolio success. Even if the stock market eventually recovers, selling part of your equity portfolio at rock-bottom prices can lead to premature failure of the withdrawal strategy.

What protects from SORR yet permits a higher SWR? A rising equity glidepath is one possibility. Let’s look at the details…

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The Ultimate Guide to Safe Withdrawal Rates – Part 20: More Thoughts on Equity Glidepaths

Welcome back to the 20th installment of the Safe Withdrawal Rate series. Check out Part 1 to jump to the beginning of the series and for links to the other parts! This is a follow-up from last week’s post on equity glidepaths to address a few more open questions:

  1. Some more details on the mechanics of the glidepath and why it’s so successful in smoothing out Sequence of Return Risk.
  2. Additional calculations requested by readers last week: shorter horizons, other glidepaths, etc.
  3. Why are my results so different from the Michael Kitces and Wade Pfau research? Hint: Historical Simulations vs. Monte Carlo Simulations.

So, let’s get to work …

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The Ultimate Guide to Safe Withdrawal Rates – Part 19: Equity Glidepaths in Retirement

One of the most requested topics for our Safe Withdrawal Rate Series (see here to start at Part 1 of our series) has been how to optimally model a dynamic stock/bond allocation in retirement. Of course, as a mostly passive investor, I prefer to not get too much into actively and tactically timing the equity share. But strategically and deterministically shifting between stocks and bonds along a “glidepath” in retirement might be something to consider!

This topic also ties very nicely into the discussion I had with Jonathan and Brad in the ChooseFI podcast episode on Sequence of Return Risk. In the podcast, I hinted at some of my ongoing research on designing glidepaths that could potentially alleviate, albeit not eliminate, Sequence Risk. I also hinted at the benefits of glidepaths in Part 13 (a simple glidepath captures all the benefits of the much more cumbersome “Prime Harvesting” method) and Part 16 (a glidepath seems like a good and robust way of dealing with a Jack Bogle 4% equity return scenario for the next 10 years).

The idea behind a glidepath is that if we start with a relatively low equity weight and then move up the equity allocation over time we effectively take our withdrawals mostly out of the bond portion of the portfolio during the first few years. If the equity market were to go down during this time, we’d avoid selling our equities at rock bottom prices. That should help with Sequence of Return Risk!

GlidepathPlot
Static Asset Allocation vs. Glidepath in (early) retirement. 80% static equities vs. a glidepath going from 60% to 100%.

So, will a glidepath eliminate or at least alleviate Sequence Risk? How much exactly can we benefit from this glidepath approach? For that, we’d have to run some simulations…
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