Retire by 45 calculator

The math of retiring at 45

Retiring at 45 means your portfolio must cover potentially 45+ years of expenses (life expectancy 85-90). The classic 4% rule was calibrated for 30-year retirements. For 45-year retirements, safer withdrawal rates are 3.25-3.5%, which means you need 28-30× annual expenses instead of 25×.

• Spend $40,000/year → need $1.2-$1.4 million
• Spend $60,000/year → need $1.8-$2.0 million
• Spend $80,000/year → need $2.3-$2.6 million
• Spend $100,000/year → need $2.9-$3.3 million

How much to save each month (by starting age)

Target: $1.5 million by age 45, 8% return, zero starting savings:

• Start at 25 (20 years): $2,545/month — achievable on $100k+ household income
• Start at 30 (15 years): $4,330/month — requires $150k+ household income
• Start at 35 (10 years): $8,220/month — requires $250k+ household income
• Start at 40 (5 years): $20,400/month — essentially impossible unless you're wealthy already

The core insight: every decade of delay roughly doubles the required monthly savings. Time is your most valuable input.

Savings rate = the real lever

Mr. Money Mustache's famous chart: if you save a constant percentage of take-home pay and invest in index funds at 5% real returns, years-to-FI depends only on savings rate:

• 10% savings rate → 51 years to FI
• 25% savings rate → 32 years to FI
• 40% savings rate → 22 years to FI
• 50% savings rate → 17 years to FI
• 65% savings rate → 11 years to FI
• 75% savings rate → 7 years to FI

To retire by 45 starting from 25 (20 years), you need a 45-50% savings rate. Starting from 30 (15 years), about 55-60%. These are extreme but achievable for dual high earners.

Practical playbook

In your 20s

Maximize 401(k) up to employer match. Max Roth IRA ($7,000/year). Keep lifestyle costs flat as salary grows. Live with roommates, drive old cars, cook at home. Target: 30-40% savings rate minimum.

In your 30s

Max 401(k) ($23,000/year in 2024). Continue Roth IRA. Open taxable brokerage for contributions above retirement account limits. Target: 40-60% savings rate. Career growth years — if you can push income without pushing spending, this is where FIRE becomes real.

In your 40s

Portfolio is ideally close to target. Shift some allocation toward bonds to reduce sequence-of-returns risk. Build bridge account (taxable) for years 45-59 before 401(k) access. Plan healthcare — ACA subsidies help significantly in early retirement.

Red flags that you're behind

• Age 30, net worth under $100,000 → need 65%+ savings rate to still hit 45
• Age 35, net worth under $300,000 → retire-at-45 probably unrealistic
• Carrying any credit card debt past 25 → kill it before FIRE math even starts
• No taxable brokerage — 401(k) is locked until 59.5, you need bridge funds

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