There's a milestone on the way to financial independence that almost nobody mentions, and it shows up a lot sooner than the finish line. It's called Coast FI, and reaching it means the hardest part of saving is already behind you. After that, time does the heavy lifting, and you get to ease off while your future self stays taken care of.
What Coast FI actually means
Coast FI is the point where you've invested enough that, even if you never add another dollar, compound growth alone will carry you to your full FI number by the time you retire. Your money keeps working after you stop feeding it.
You're not finished. You still have to cover today's bills. But you no longer have to save aggressively for retirement, because retirement is already funded in slow motion. You can coast.
The engine behind it is compounding, and the earlier you hit Coast FI, the more runway compounding gets. A dollar invested at 30 has decades to grow, which is why a fairly modest amount, left alone, can quietly become a large one.
A simple example
Say your FI number is $1,000,000, enough to cover a $40,000-a-year life. And say you're 30, planning to retire around 60. That's 30 years for your money to grow.
At a 7% average annual return, money roughly doubles every decade. Run that forward, and you'd only need about $130,000 invested today to reach $1,000,000 by 60, without saving another cent.
So a 30-year-old with around $130,000 invested is, in a real sense, already on track for retirement. They still need to earn a living. But the retirement part? Handled, as long as they leave it alone.
Why this changes how it feels
The full FI number can look impossible. A million dollars, two million, the figure can be paralyzing when you're starting out. Coast FI breaks the journey into something human. The first goal isn't "save everything for thirty years." It's "get enough invested early that you can finally breathe."
And reaching it buys real freedom now, not just later:
- You can take the lower-paying job you actually want, because you no longer have to out-save your future.
- You can go part-time, or take a season off, without derailing retirement.
- You can stop white-knuckling your savings rate and simply cover your life, knowing the long game is already won.
That's the quiet gift of Coast FI. It moves the reward forward.
The honest caveats
This is a planning tool, not a promise, so keep a few things in mind:
- The growth rate is an assumption. 7% is a rough long-term average, not a guarantee. Markets fall, and after inflation your real return is lower. Treat the result as a direction, not a date.
- It only works if you leave it alone. Spend the money and the math resets.
- It's built around a normal retirement age. Coasting funds your sixties. Wanting to stop much earlier is a bigger number and a different plan.
(Educational, as always. None of this is financial advice, it's a way to see your own situation more clearly.)
See where you stand today
The free Money Snapshot shows your net worth, your FI number, and how close you are, right in your browser, with nothing saved.
Run your free Money Snapshot →How to find your Coast FI number
You don't need a page of formulas. Start with your FI number, pick a rough growth rate and the age you'd like to retire, and discount it back. Or skip the math: the free Money Snapshot shows where you stand against your number today, and the Money System maps the whole ladder, from your first $10,000 through Coast FI to full independence, so you can watch each milestone get closer.
Most people are further along than they think. Coast FI is often the first time the math feels like it's on your side. Find your number, and you may be surprised how close that first real milestone already is.
Cole
Educational only. Nothing here is financial, investment, or tax advice. Figures are rounded examples that assume a 7% average annual return, which is not guaranteed.