Using the 4% rule for retirement withdrawals has been a much studied approach and has produced some skeptics due to its lack of flexibility. There are several withdrawal strategies, which Morningstar compared in depth in a recent study.
Michael Finke, professor and Frank M. Engle Chair of Economic Security at the American College of Financial Services
David Blanchett, managing director and head of retirement research, PGIM DC Solutions
Christine Benz, director of personal finance, Morningstar

