Question 1

What is Coast FIRE?

Accepted Answer

Coast FIRE (Financial Independence Retire Early) is when you have saved enough that compound growth alone will reach your FIRE number by traditional retirement age, without additional contributions. Once you reach Coast FIRE, you can stop saving for retirement entirely and work only to cover current expenses. This provides financial flexibility decades before full retirement.

Question 2

How do I calculate my Coast FIRE number?

Accepted Answer

Calculate your full FIRE number (annual expenses × 25), then discount it back to present value using compound growth. For example, if you need $1,000,000 at age 65 and expect 7% returns over 20 years, your Coast FIRE number today is about $258,000. Once you hit this amount, you can stop retirement contributions and the account will grow to $1,000,000 by age 65.

Question 3

What is the difference between Coast FIRE and Regular FIRE?

Accepted Answer

Regular FIRE means you have saved 25x annual expenses and can retire completely today. Coast FIRE means you have enough saved that compound growth will reach your FIRE number by traditional retirement age (typically 65), but you still work to cover current living expenses. Coast FIRE requires much less saved (often 30-50% of full FIRE) but you continue working until traditional retirement age.

Question 4

Can I retire early with Coast FIRE?

Accepted Answer

Not fully. Coast FIRE means you must continue working to cover living expenses until traditional retirement age. However, it provides enormous lifestyle flexibility - you can take lower-paying but more fulfilling jobs, work part-time, take career breaks, or pursue passion projects without worrying about retirement savings. You are financially secure for the future but not financially independent today.

Question 5

What happens if I keep saving after reaching Coast FIRE?

Accepted Answer

If you continue saving after Coast FIRE, you accelerate toward full FIRE and can retire earlier than traditional retirement age. Many people use Coast FIRE as a milestone rather than an endpoint. Reaching Coast FIRE reduces financial stress and provides options, but continuing to save even at a reduced rate can shorten your working years significantly.

Question 6

What investment returns should I assume for Coast FIRE?

Accepted Answer

Conservative Coast FIRE calculations use 5-6% real returns (after inflation). Moderate calculations use 7% (historical stock market average). Aggressive calculations use 8-10%. Using conservative assumptions provides a buffer against market underperformance. If you assume 6% but markets return 8%, you will exceed your target or can retire earlier than planned.

Question 7

Should I include Social Security in Coast FIRE calculations?

Accepted Answer

It depends on your age and trust in the system. Younger workers (under 40) should be cautious about relying heavily on Social Security, as benefits may change. Older workers (50+) can reasonably include estimated benefits. A conservative approach is to calculate Coast FIRE without Social Security, treating future benefits as a bonus that could allow earlier retirement or higher spending.

Question 8

What are the risks of Coast FIRE?

Accepted Answer

Main risks include: (1) Lower investment returns than projected (requiring more years working), (2) Higher than expected retirement expenses (requiring more savings), (3) Job loss or inability to work (having no retirement contributions as buffer), (4) Sequence of returns risk (poor markets early can derail projections). Mitigate risks by using conservative return estimates, maintaining emergency funds, and periodically recalculating your Coast FIRE status.

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