The core idea
With Coast FIRE, you build enough invested assets early that they can compound on their own until a traditional or semi-traditional retirement age.
After that point, work can become more flexible because you no longer need to save aggressively every year.
Why people like it
Coast FIRE appeals to people who want more freedom before full retirement. It can support part-time work, career changes, or lower-stress jobs.
For many people, that middle path feels more realistic than an all-or-nothing retirement target.
What still matters
You still need a solid estimate for future spending, investment growth, and the age when you want the portfolio to be ready.
Coast FIRE is less demanding than full early retirement, but it still depends on disciplined assumptions.