First, I don't depend on Savings as a core part of my retirement.
When the market cratered it went from 14,000 to 7,000. If I had a million dollars in my account when I retired, the 4% rule would say I could live on $40,000 a year. However, if I retired a year later, I would only be able to spend $20,000! I for one, would never feel comfortable continuing to spend as if I had retired with a million.
This is similar to the Three Brothers thread. It's not as apples-to-apples as it seems.
edit - I see what I wrote does not address what you said, so I'm striking it. Although it stands as is, so I won't delete it.
[-]So say you retired with $1M and took 4% ($40,000) with the 'market' at 14,000. If you hypothetically retired a year later instead, with the 'market' at 7,000 you wouldn't have a million. You would have ~ $500,000. So FIRECALC would still say take 4%, and 4% of $500,000 is $20,000 not the original $40,000.[/-]
There is no inconsistency at all regarding FIRECALC, (edit/add: ) - but it is a 'gap'.
As
haha puts it - FIRECALC can make no assumptions about the
value of your portfolio when you retire, only the
amount of $ you enter. And clearly, having a $1M portfolio at the peak of a bubble is not worth as much as still having $1M after the bubble has burst. (edit/add: ) and in your example, the $500,000 is worth about as much as the $1M from a year earlier, so yes, they should be able to spend about the same. I'll venture that in rough numbers, that 'same' is probably best looked at as an average of the two - about 3%.
But FIRECALC is saying that historically, the $1M portfolio survives 95% of the time at 4%. So if 95% is OK with you, and relying on history is OK with you - there ya' go. It's really the $500,000 guy that could go to 8% in this case (if you could 'trick' FIRECALC to skip the first year of downturns, as is what happens in your construct).
Of course it's hard to know where we are when we are in the middle of a cycle, but I think the intro to FIRECALC should touch on this. If you just saw your portfolio rise in value because we just had a few extra good years, you should be extra conservative with the SWR %. Conversely, if we have had several bad years, you might be able to be less conservative. Human nature probably drives people to the opposite conclusion. And we can' bank on ANY of it.
-ERD50