Coast FIRE Number at Age 48
With 17 years of compounding ahead of you (retiring at 65), here's exactly how much you need invested at 48 to never save for retirement again.
Your Coast FIRE number at 48
$523,249
Assumes $40k/year retirement spending, 7% nominal return, 3% inflation, 4% safe withdrawal rate, no fund fees, retirement at 65 (real return ≈ 3.88%).
Coast FIRE Number at 48 by Spending Level
| Annual retirement spending | FIRE number | Coast FIRE number at 48 |
|---|---|---|
| $30,000 | $750,000 | $392,437 |
| $40,000 | $1,000,000 | $523,249 |
| $50,000 | $1,250,000 | $654,062 |
| $60,000 | $1,500,000 | $784,874 |
| $75,000 | $1,875,000 | $981,092 |
| $100,000 | $2,500,000 | $1,308,123 |
What This Means for You
If you have $523,249 invested at age 48, your portfolio can grow entirely on its own to roughly $1,000,000 by age 65 — enough to support $40,000 of annual spending under the 4% rule. From that moment on, every dollar you earn is yours to spend; retirement saving becomes optional.
With 17 years until retirement, compounding still helps, but your required balance is closer to your full FIRE number. Consistent contributions matter more than ever.
These are planning estimates with fixed assumptions. Your actual retirement age, spending, and returns will differ — plug your real numbers into our free Coast FIRE calculator for a personalized result, or read the complete Coast FIRE guide.