Can I stop investing after reaching Coast FIRE?

Mathematically, yes — your portfolio should compound to your FIRE number without additional contributions. In practice, continuing to invest even small amounts provides safety margin against lower-than-expected returns or longer-than-expected retirement. Most Coast FIRE achievers continue some level of investment.

How does Coast FIRE differ from regular FIRE?

Regular (full) FIRE means your portfolio is already large enough to sustain withdrawals now — you can stop working entirely. Coast FIRE means your portfolio will reach that level by traditional retirement age, but you still need to work to cover current expenses. Coast FIRE is a checkpoint on the way to full FIRE.

What return rate should I use to calculate Coast FIRE?

Use a 5–7% real (inflation-adjusted) return for planning purposes. The historical U.S. stock market has returned about 7% annually after inflation. Using a more conservative 5% provides additional margin of safety. Avoid using nominal returns (10%) without accounting for inflation.

Coast FIRE Explained: Invest Now, Relax Later

What Is Coast FIRE?

Coast FIRE is a milestone in the FIRE (Financial Independence, Retire Early) journey. You've reached Coast FIRE when your invested portfolio is large enough that — without adding another dollar — it will compound to your full FIRE number by traditional retirement age (typically 65). You can "coast" to full financial independence on investment growth alone.

After reaching Coast FIRE, you no longer need to save for retirement. You only need to earn enough to cover your current living expenses. This unlocks a dramatic reduction in work pressure — you can take lower-paying jobs you love, work part-time, or take extended sabbaticals.

How to Calculate Your Coast FIRE Number

The Coast FIRE number is calculated by discounting your FIRE number back to today using the expected real rate of return:

Coast FIRE Number = FIRE Number ÷ (1 + real return rate)^years to retirement

Example: You're 32 years old, want to retire at 65 (33 years), need $1,500,000 at retirement, and expect a 7% real return:

Coast FIRE Number = $1,500,000 ÷ (1.07)^33 = $1,500,000 ÷ 9.33 = ~$160,750

Once you have $160,750 invested at age 32, compounding at 7% takes it to $1.5M by age 65 — without any additional contributions.

Why Coast FIRE Is Achievable Earlier Than You Think

The math of compounding makes Coast FIRE reachable relatively early in life if you invest aggressively in your 20s and 30s. Consider two scenarios with a $1.5M FIRE target at 65:

Age 25: Coast FIRE number ≈ $98,000 (40 years of compounding at 7%)
Age 35: Coast FIRE number ≈ $192,000 (30 years)
Age 45: Coast FIRE number ≈ $379,000 (20 years)

What to Do After Reaching Coast FIRE

After coasting, you need income only to cover current expenses — not to save for retirement. This might mean:

Transitioning to work you find meaningful even if lower-paid
Reducing to part-time while a partner maintains full income
Starting a business without the pressure of it needing to grow your retirement savings
Taking an extended travel period before returning to work

Coast FIRE vs Barista FIRE

Barista FIRE is similar but specifically means semi-retiring with part-time work that covers current expenses (and often health insurance through employer benefits). Coast FIRE is the mathematical calculation; Barista FIRE describes a specific semi-retired lifestyle. Many people achieve Coast FIRE and implement a Barista FIRE lifestyle simultaneously.