How Much Money Do I Need to Retire? Build a Range, Not a Magic Number

Why one retirement number can mislead

Rules such as saving a multiple of salary are convenient because salary is easy to find. Retirement, however, is funded by spending rather than salary. A high earner who saves aggressively and expects modest retirement spending may need a smaller share of final pay than someone whose paycheck mostly supports current expenses.

Timing also changes the answer. Retiring several years before Social Security and Medicare can create a temporary funding peak. Claiming benefits later may increase dependable lifetime income, but the portfolio must carry more of the early years. A total balance hides that timing; a cash-flow timeline reveals it.

Planning takeaway

Replace the question 'What is my number?' with 'What range supports my plan, and what assumptions drive it?'

Estimate the portfolio's annual job

Begin with annual household spending in today's dollars. Add irregular costs that generic budgets miss: health insurance before Medicare, home repairs, vehicle replacements, taxes, and family support. Then subtract Social Security, pensions, annuity income, and other recurring income in the years each source actually begins.

The remainder is the withdrawal gap. If spending is $90,000 and dependable after-tax income covers $45,000, investments need to support roughly $45,000 for that phase, plus taxes and one-time goals. The gap may be much larger in the first five years and smaller later, so calculate it year by year when possible.

• Use today's dollarsThis makes the result intuitive. The model can then apply inflation consistently.
• Separate essentialsKnowing what can be trimmed gives the plan a response when markets are weak.
• Model both livesFor couples, test the longer survivor horizon and changes to income after the first death.

Convert the gap into a planning range

Dividing the first-year withdrawal gap by a starting withdrawal rate can provide a rough portfolio estimate. For example, a $40,000 gap divided by 4% equals $1 million. This is a shorthand, not a complete plan. It assumes the first-year gap resembles later years and does not fully capture taxes, changing income, large expenses, or poor return timing.

Create at least three versions: a base case, a lean case that uses realistic spending flexibility, and a higher-cost case with more inflation or a major expense. Then run each through the same modeling assumptions. The overlap among workable versions is more informative than a falsely precise target.

Planning takeaway

A range shows which parts of the plan are sturdy and which depend on favorable assumptions.

Improve the plan without only saving more

Saving more is one lever, but it is not the only one. Delaying retirement can add contributions, shorten the withdrawal period, and preserve employer health coverage. Adjusting Social Security timing changes the shape of dependable income. Paying off or downsizing a home changes recurring spending. Tax-diverse accounts can create more control over taxable income.

Compare one change at a time so you know what helped. A useful model should show the before-and-after effect on cash flow, critical downside paths, and modeled success. Avoid chasing 100%; uncertainty cannot be eliminated. The goal is to build enough margin and flexibility that a disappointing path still has a response.