That estimate doesn't include a COLA rider. Even at 2% inflation that $8K/month is only worth around $5K after 20 years. The COLA is important and it costs money.
I totally agree. I brought up the SWR calculation because it was suggested $1M invested could produce $80K/year of income for the individual's remaining lifetime, and that's a risky bet. The point of safe SWR rates isn't leaving money to heirs - it's having a high probability of not running out of money before dying.
Just because the MEDIAN life expectancy of a 65 yo M is 18 years doesn't mean many 65 yo men won't live for 30. The average 65 yo who doesn't plan for a 30 year retirement is a playing a dumb game.
Actually pricing an annuity is the best way to determine what a stream of income will cost. If you want a COLA included on the estimate, simply use a calculator that includes it. The reason individuals use a SWR is obviously so they don't run out of money, but that includes the possibility that they live for an additional 30 or 40 years which necessitates taking smaller amounts out annually. The point of an annuity is that they spread that risk across a population so if you happen to live a really long time the annuity can still keep paying a higher amount than a SWR would have over the same duration. Having a 30% probability of failure with an SWR would obviously be not very good for an individual, but would be absolutely wonderful for an annuity since that meant 70% of their customers got paid out less. That's why annuities can pay out a much higher rate from a lump sum than any rational individual would take for themselves.
I do not argue for or against annuities for personal retirement planning. They are what they are. But the pricing of annuities is a very useful tool for understanding the value of something providing a similar stream of income indefinitely.
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