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Assumptions matter most

Some people are enamored with the word tariffs. My new favorite word is assumptions.

I was listening to a podcast today and they told a story of a person who went to two financial planners seeking to determine if his retirement plan was sufficient. The first planner told him he had a 95% chance of success. The second said 75%. Naturally, he went with the first planner, but failed to ask the key question. What assumptions were used in the calculation?

There are so many assumptions to consider – spending levels and patterns, life expectancy, inflation over 30 years or so, risk tolerance, a legacy goal and then there is the biggy, investment returns and the variables within that investment mix and more. 

I never had to deal with this, but it sounds scary while extremely important.  As the podcast noted, even a 1% difference in investment return assumptions can make a significant difference in the projection – and the income reality in the future. 

Turns out in the example which enticed the individual, the 95% success, used aggressive investment return percentages with little deviation. Nevertheless, the – likely unrealistic 95% – was too enticing. 

I was surprised to learn from the planners on the podcast that hardly anyone asked about the assumptions used when they presented a client with a plan. 

I doubt I would know all the questions to ask, but I know using conservative assumptions would lower my stress even if it meant working a little longer. 

How about you? Do you know the assumptions your future is based upon? 

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Robert FREY
1 year ago

As a financial planner that has prepared hundreds of retirement projections for clients, this article is spot on. However, Dick fails to mention one important source of assumptions, the clients’ assumptions. One of the planners responsibilities is to bring up the assumptions the clients forget, such as home maintenance, auto replacement costs, medical costs, etc. Yes, the investment return and volatility assumptions are hugely important, and we always erred on the conservative side on both. It’s also important to point out to the client that assuming relatively minor reductions in future expenses can result in significant increases in the success of their strategy. The planner should tell the client there are no guarantees in their future,and this is simply a reasonable roadmap and invariably will require some adjustments (both positive and negative) as events develop.
The main objective of a properly done retirement plan is to either put the client’s mind at ease that they are well prepared for retirement or convince a totally unrealistic client that they are headed for disaster, as their assets cannot possibly accomplish their goals.
Although not the focus of Dick’s article, a properly done Social Security analysis, especially for a couple, is a huge part of a retirement plan.

David Powell
1 year ago
Reply to  Robert FREY

Retirement helped me see this more clearly: “…relatively minor reductions in future expenses can result in significant increases in the success of their strategy.” Yet another form of compounding which puts time to work for you.

David Weiss
1 year ago

numbers are ‘juked’ to produce an outcome, to provide a desired result…

in the case of the 95% there was emphasis on producing attention, to attract money, and could be rationalized after the fact to excuse variation from obvious reality (ex: it was biden’s economy–i am not culpable)

the 75% was trying to be rational and escape the inevitable disappointment of irrational expectations, assuming there IS disappointment, we seem to have the deep-dive memories of drunken gerbils these days. i’m not convinced it matters, the sources leading to that disappointment can be confused, obfuscated… (who could have predicted X??)

both camps are using the same data coming to different conclusions…

worrying about materials and methods to come to financial conclusions is to me less convincing then what they are trying to do!! quo bono, que bene? what are they trying to do?

then realize the locked door room puzzle with a can of beans for the hungry economist says ‘assume a can opener..’