a safe withdrawal rate is based on what it would take to get through the worst time frames a retiree would have seen . anything better is a plus .
specifically the worst starting year's for a retiree to have chosen was 1907,1929,1937,1965,1966 with 1965/1966 the absolute worst . we have seen nothing worse for any retiree group in more than 50 years now .
we had 116 30 year cycles so far . 90% of the cycles drawing 4% inflation adjusted left you with more than you started . 67% of the time it left you with 2x what you started and 50% of the time it left you with 3x what you started .
so that gives you an idea of what the safe withdrawal rate is based on and how conservative it is .
it takes at least 35% -40% in equity to get a high enough success rate over 30 years at 4% . today safe withdrawal rates can be calculated for longer retirements and with lots of allocations to stocks and bonds.
zero equities and using only fixed income to generate your income over 30 years failed at trying to draw the same 4% , 62% of all 116 time frames . that is as risky a bet as you can make .
you had to cut it down to 25 years at only a 3% draw to see at least a 90% success rate . planning out to 25 years can be risky if you are 62 ,so more than likely about a 2-1/2 % draw inflation adjusted is about as good as it gets for fixed income only .
that is like taking almosrt a 50% pay cut for not using at least 35% equities .
taking raises along the way when using a constant spending 4% is important or to many dollars may be left not enjoyed and could have been .