Hi Davidrmoran,
You raise important questions with regard to a
retirement cash cushion requirement. How much is needed? How was that level determined? What fraction of a
retirement portfolio should be protection money in the form of near-term cash equivalents?
I retired twenty years ago, and at that time I was exposed to several professional
retirement expert estimates. Yesteryears typical number hovered around two years worth of the planned withdrawal rate. Does four years near-term cash provide additional protection benefits?
This is another example of the benefits of Monte Carlo simulations to scope the issues. There is little need to rely on rules-of-thumb or instincts or opinion.
Since the
retirement decision is so far in my rearview mirror, I really don’t want to spend too much time doing real work. Therefore, I only did 4 simulations to illustrate the tradeoffs. These took about 5 minutes to complete using the Portfolio Vizualizer Monte Carlo tool. If the subject is of paramount significance for you, a more comprehensive set of calculations is likely warranted.
I assumed a 30 year
retirement time horizon with drawdowns at the 4.5% and 5.5% portfolio levels. I used the programs Historical Returns and Historical Inflation options. I postulated a simple portfolio mix with an asset allocation of 40% US equities, 10% International Equities, 30% or 40% Bond, and either 20% or 10% cash. That’s a 4 calculation matrix with a 50/50 split between equities and fixed income sources.
Obviously, end wealth was always higher (like a factor of 2) for the lower 4.5% withdrawal schedule. End wealth was higher for the 2 year cash reserve portfolio. Portfolio survival was marginally higher for the 2 year cash reserve portfolio. At the 2 year cash asset allocation, portfolio survival was 88% for the 4.5% drawdown rate, and dropped to 70% at the higher 5.5% withdrawal rate.
The 2 year cash cushion wins by both end wealth and survival measures.
These sample simulations suggest that you need not concern yourself with a 4 year cash reserve. Although it certainly would increase the comfort zone for any retiree, it is likely an unnecessary luxury. It seems like an arbitrary number. Portfolio asset allocation is always a top-tier investment decision, especially so during
retirement.
I suggest you try a few Monte Carlo cases yourself to confirm and expand my brief findings.
Best Wishes.
EDIT: For completeness, here is the Link to the Monte Carlo code that I used in the reported calculations:
https://www.portfoliovisualizer.com/monte-carlo-simulation