Coast FIRE number at 50
Coast FIRE means you've invested enough that, even if you never save another dollar, compound growth alone carries you to a full retirement. At age 50, roughly $601,000 invested today would grow to a $1,250,000 nest egg by 65 (assuming a 5% real return) — enough to fund a comfortable retirement. After that, your paycheck only has to cover today's expenses.
Your Coast FIRE number at 50, by return assumption
Coast FIRE is sensitive to the return you assume over the 15 years to 65 — a higher real return means a smaller amount needs to compound:
| Return | Coast number | Growth |
|---|---|---|
| 4% real | $694,000 | 1.8× |
| 5% real | $601,000 | 2.1× |
| 6% real | $522,000 | 2.4× |
What Coast FIRE does and doesn't mean
Hitting your Coast FIRE number is a genuine milestone: your retirement is essentially on autopilot, and you gain the freedom to take a lower-paying but more fulfilling job, go part-time, or stop retirement contributions and spend that money now. It does not mean you can stop working — you still need income to cover current living expenses until you actually retire.
The number rests on two assumptions worth pressure-testing: the return you earn over the years to 65 (markets are uncertain, and a weak stretch early does outsized damage), and the target nest egg itself, which depends on your future spending. Model your own inputs to see how sensitive your coast number is to both.
When the coast number starts to resemble the full target
At 50 there are only about 15 years for compounding to work before a traditional retirement age, and that compressed window changes the character of Coast FIRE. With less time for growth to multiply what you already hold, the coast number moves closer to the full amount you would need simply to retire outright. The gap between merely coasting and being done narrows considerably.
The shorter horizon also leaves little room to recover from a bad stretch. A steep decline in your late 50s or early 60s lands close enough to the finish line that the portfolio may not fully rebound before you stop working. That is the case for a more conservative glide path as you approach the target, shifting a portion toward bonds even though it lowers expected growth. The point is to trade a slightly higher average return for a narrower range of outcomes right where a shortfall would hurt most.
Framed this way, the coast number at 50 is less a savings finish line than a signal to start protecting what compounding has already built.
Common questions
What is the Coast FIRE number at 50?
About $601,000 invested at age 50, assuming a 5% real return, would grow to a $1,250,000 retirement nest egg by 65 with no further contributions. At a 6% real return it's closer to $522,000; at 4%, about $694,000.
Does Coast FIRE mean I can stop working?
No — it means you can stop saving for retirement. You still need enough income to cover your current living expenses until you retire; your retirement savings just grow on their own from here.
What return should I assume for Coast FIRE?
A real (after-inflation) return of about 5% is a common, moderate assumption for a stock-heavy portfolio over a long horizon. Because markets are uncertain, it's wise to check your number against a lower rate too.