How much do I need to withdraw each year?
Start with the amount you need available to spend after tax. Then estimate the additional withdrawals needed to cover taxes on the income and distributions funding that spending. Account for other income, such as Social Security, a pension, annuity payments, or rental income, on a consistent after-tax basis so taxes are not counted twice. What remains is the gap your savings need to fill.
That gap is a working estimate, not a fixed promise. It changes as spending, income, and taxes change, which is why the plan is reviewed rather than set once.
