FIRST --- The total is a separate question from the RMD on 401k/IRA accounts to which that applies (note: not Roth IRAs as with those contributions were after tax). In other words, you must take AT LEAST the amount as of 12/31 the previous year divided by the life expectancy table the gov't uses for this purpose. That latter number will always be decreasing, so taking a larger and larger percentage. But that does not take into account that your fund is presumably growing at 4-5%. As a result the amount you would be taking not constant but increasing until near the end (at 5% the max amount would be over 80 years old).If this amount is greater than your total planned withdrawals (from all sources) you invest the excess.

SECOND --- If you calculate how much to withdraw from other sources assuming a constant rate of return, the amount will fluctuate wildly. Most organizations use a multi-year average to determine how much to take from endowment funds. Rules for that vary, but I will give an example. The rule might be, average the rate of return for the previous three years and take that (mean) percentage of the previous end of year balance. Could use a different number of years, different ways of calculating average*, etc.

THIRD --- Notice that inflation, etc. not (yet) taken into account. Nor questions like how much needed to sock away now to provide a large enough fund to produce annual payments of at least that amount. In practice, rules about how much you are allowed to sock away tax deferred, how much subject to matching, etc. are going to play a large role in what you  end up doing.

Michael D Novack

* especially when much longer periods used, fancier ways of calculating "average" might give better results

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