Most people answer "how much do I need to retire?" with a round number like $1 million or $2 million. But the real answer depends on one thing: how much you plan to spend each year. The 4% rule gives you a formula to work backwards from spending to your target nest egg.
The 4% Rule Explained
The 4% rule comes from the Trinity Study (1998), which analyzed 30-year retirement periods using historical market data. The finding: withdrawing 4% of your portfolio in year one, then adjusting for inflation each year, had a near-100% success rate over 30 years. Your retirement number is simply: Annual spending ÷ 0.04.
Spending $50,000/year? You need $1.25M. Spending $80,000/year? You need $2M. Spending $40,000/year? You need $1M. The formula is Annual Spending × 25.
Retirement Numbers by Lifestyle
- •Lean FIRE ($35k/year): $875,000 — frugal lifestyle, low-cost area, minimal travel
- •Standard retirement ($55k/year): $1,375,000 — average US household spending
- •Comfortable retirement ($80k/year): $2,000,000 — travel, dining out, helping family
- •Luxury retirement ($120k/year): $3,000,000 — two homes, frequent travel, giving
- •Fat FIRE ($200k+/year): $5,000,000+ — high-end lifestyle with full flexibility
Factors That Change Your Number
- •Social Security: If you expect $2,000/month from SS, that's $24,000/year less your portfolio needs to cover — reducing your target by $600,000
- •Retirement age: Retiring at 50 means a 40-50 year horizon; the 4% rule is less reliable; consider 3.5% (28x) instead
- •Healthcare: Pre-Medicare years (before 65) add $500–$1,000/month to expenses
- •Geographic arbitrage: Retiring in Portugal or Mexico at $3,000/month changes everything
- •Part-time income: Even $1,000/month in retirement reduces portfolio draw by $300,000 needed
Don't forget: your spending in retirement often follows a "smile" pattern — higher early (active years), lower mid-retirement, then higher again late (healthcare). Budget accordingly.
Frequently Asked Questions
What is the 4% rule and is it still valid?
The 4% rule (from the Trinity Study) says you can withdraw 4% of your portfolio each year in retirement and have a 95%+ chance of the money lasting 30 years. So if you need $60,000/year, you need $1.5 million saved. It's still widely used, though some planners suggest 3.5% for early retirees given lower bond yields.
Calculate your retirement number →How much should I have saved by age 65?
Fidelity's benchmark: 10× your final salary saved by age 67. If you earn $80,000, target $800,000. Vanguard suggests 12× for earlier retirees. Social Security will supplement this — average benefit in 2025 is about $1,900/month — so a $600,000 portfolio plus Social Security can often cover a comfortable retirement.
Factor in Social Security →How much should I have saved by each decade?
Common benchmarks (as a multiple of your current salary): 1× by 30, 3× by 40, 6× by 50, 8× by 60, 10× by 67. These assume a 15% savings rate and 7% average return. Falling behind? Increasing your savings rate by even 2–3 percentage points can dramatically close the gap, especially in your 30s and 40s.
Is $1 million enough to retire on?
It depends entirely on your spending. With the 4% rule, $1M supports $40,000/year in withdrawals. Add $2,000/month in Social Security and your income is $64,000/year — comfortable for many retirees. If you live in a high cost-of-living area or plan to retire at 55, you'll need more. Run your personal numbers with a retirement calculator.
Model your retirement income →What's the biggest mistake people make with retirement planning?
Starting too late. Every decade you delay roughly cuts your final balance in half. A 25-year-old saving $300/month at 7% reaches $1M by 65. A 35-year-old needs $600/month to reach the same number. The second biggest mistake is underestimating healthcare costs — average retired couple spends $315,000+ on healthcare alone.