William Bengen’s seminal study about 4.5% Safe Withdrawal Rate for 30 years of inflation adjusted retirement income
Most commonly used retirement income planning strategies use actual expences , which I believe is more practical and includes one's spending habits and chosen life style. One of the most popular strategy uses 55/45 stock/bond conservative retirement portfolio equal to 22 times of desired initial yearly needed expences (after accounting social security benefits). For example, say someone retires at age 67 and starts collection 50K social security benefit as joint household. With fully paid house, say household expences are 60K per year. So household needs remaining 10K from retirement portfolio to meet all expenses. Using above rule of 22, one just needs 220K (22*10K) portfolio to provide needed retirement income for rest of retirement years. Now, let's visit other scenario where household wants to retire earlier , say by age 62. Social Security benefits are reduced (25%) to around 40K per year in that case. Now household needs retirement portfolio to provide remaining ...