Introduction
"How much do I need to retire?" is the most important financial question most people never answer concretely. Retirement planning often feels abstract — full of variables, decades away, and overwhelming in scope. But there is a straightforward framework that gives you a real number to aim for. Understanding it transforms retirement from a vague aspiration into a concrete, trackable goal.
The 4% Rule: Your Starting Point
The most widely used retirement framework is the 4% rule, derived from the "Trinity Study" published in 1998. It states that if you withdraw 4% of your retirement portfolio in year one and adjust for inflation thereafter, your portfolio has historically lasted 30 years in the vast majority of market scenarios. The rule gives you a simple formula: multiply your desired annual retirement income by 25. If you want $60,000/year in retirement, your target is $1,500,000. If you want $80,000/year, your target is $2,000,000.
Step 1: Estimate Your Annual Retirement Spending
Start by estimating what you'll spend each year in retirement. A common rule of thumb is 70–80% of your current income, since you won't have commuting costs, retirement savings contributions, or work expenses. But spend time building a detailed budget: housing costs (mortgage paid off? downsizing?), healthcare (the biggest wildcard), travel, and leisure. Don't forget to subtract guaranteed income sources: Social Security, pension payments, rental income.
Step 2: Account for Social Security
Go to ssa.gov and get your Social Security estimate. For many middle-income workers, Social Security replaces 35–45% of pre-retirement income. If you're entitled to $2,000/month ($24,000/year), that's $24,000 you don't need your portfolio to provide. Subtract your guaranteed income from your target retirement spending to find your "portfolio income gap" — the amount your savings must cover.
Step 3: Apply the Multiplier
Once you know your portfolio income gap, multiply by 25 (for the 4% rule) or 33 (for a more conservative 3% withdrawal rate). For example: target spending $72,000/year, Social Security $24,000/year, portfolio gap = $48,000/year. At 4% rule: $48,000 × 25 = $1,200,000 target portfolio. At 3% rule: $48,000 × 33 = $1,584,000.
Step 4: Work Backwards to Today
Use a compound growth calculator. If you're 35, have $150,000 saved, and can contribute $1,500/month with a 7% average annual return, you'll have approximately $2.1 million at 65. If that covers your number, you're on track. If not, you need to increase contributions, reduce the target, or plan to work longer.
Conclusion
Your retirement number is not mysterious. It is a function of your spending, your guaranteed income, and the math of compound growth. Use our Retirement Calculator to find your personalized number and track your progress over time.