Ongoing retirement planning involves making best estimate (or conservative) assumptions about the future and making necessary adjustments to your retirement plan when those assumptions inevitably turn out to be incorrect. At How Much Can I Afford to Spend, we believe using our Actuarial Financial Planner (AFP) model annually to calculate your funded status can best help you with ongoing (or dynamic) retirement planning.
On the other hand, some financial advisors and academics encourage use of “safe” alternatives (like the 4% Rule or Monte Carlo model results with 90% or greater probability of success) where future retirement plan adjustments are generally not anticipated. This type of planning is referred to as “one-and-done” (or static) retirement planning. We also refer to this second type of retirement planning as “head-in-sand” retirement planning as it is very difficult to predict the future accurately and, as a result, it is very easy to either overspend or underspend relative to your spending goals when using these static approaches. For more discussion of ongoing vs. static planning, see our post of January 15, 2023.