Coast FIRE at 55 on a $150K Salary
FIRE Number
$2.4M
Target Retirement Age
65
Years to FIRE
10
Monthly Savings Needed
$5K
Coast FIRE at 55 on a $150K salary is is highly achievable — maxing a 401k alone covers most of the required monthly savings. Your FIRE target is $2.4M ($97K/year at 65% income replacement). To coast there from age 55, you need $1.2M invested by then — that's your Coast FIRE number. At 7% real returns over 10 years, $1.2M compounds to approximately $2.4M by age 65.
Starting at age 42 with $38K, saving $5K/month for 13 years reaches $1.2M — a 36% savings rate on your $150K gross income. This is an aggressive savings rate that requires significant lifestyle discipline but delivers the maximum compounding benefit. After 55, you no longer need to save for retirement — you only need to earn enough to cover your $8K/month in living expenses.
The 55-year coast window for $150K earners works particularly well because at 55, you're within striking distance of full retirement account access (at 59½), Rule of 55 benefits, and ultimately Medicare at 65 — making the coast window structurally simple. Social Security at 67–70 adds $3K/month as a meaningful backstop.
One planning note: the $150K + age 55 scenario works best with tax-advantaged account prioritization. Max your employer 401k match ($1000/month in free matching at 4%), then Roth IRA ($583/month = $7,000/year), then additional 401k contributions up to $5K/month total. Keeping investment costs low (under 0.1% expense ratio) on a $1.2M portfolio saves approximately $11K per year in avoided fees — compounding into significant additional wealth over 10 years.