4% every year? even this one?

I'm withdrawing a bit from IRAs, ahead of RMDs in a few years, which will decide for me how much I'll be taking out each year. For those of you who make voluntary withdrawals, do you go with a fixed percentage, like 4% every year, plus an inflation boost, calculated on January 1 and taken at the beginning of the year? Or do you recalculate to reflect market change, and withdraw gradually throughout the year? Or wait till Dec 31 when you know how the year went, and then take it?

I'm thinking this is sort of related to "decumulation", which for me includes both retirement money and other savings socked away.  4% a year max spent out of all your assets? Or more variable?

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