At 50, you have 15 years of compounding before a traditional retirement at 65. With $50,000/yr of retirement spending, a 7% return, 2.5% inflation, and a 4% withdrawal rate, your Coast FIRE number is about $656,000. Hit it, and your fifties become about working on your terms — not funding your sixties.
Want contributions, a coast-date chart, and adjustable rates? Use the full Coast FIRE calculator.
Assumes retirement at 65, 7% nominal returns, 2.5% inflation, 4% safe withdrawal rate. All figures in today's dollars.
| Retirement spending | Full FIRE number | Coast number at 50 |
|---|---|---|
| $40,000/yr | $1,000,000 | $525,000 |
| $50,000/yr | $1,250,000 | $656,000 |
| $60,000/yr | $1,500,000 | $787,000 |
| $80,000/yr | $2,000,000 | $1,050,000 |
Each dollar invested at 50 grows to about $1.91 in today's purchasing power by 65 — compounding still nearly doubles your money. And 50+ unlocks the biggest levers in the tax code: catch-up contributions on 401(k)s, IRAs, and HSAs. A household maxing catch-up limits can add six figures to their portfolio in just a few years, turning a shortfall into a coast position surprisingly fast.
Sequence-of-returns risk is closer now — should I pad the number? Sensible. Many planners target 110–120% of the coast number or drop the withdrawal rate to 3.5% at this age. Test both in the full calculator.
What about healthcare before Medicare? If you stop working before 65, budget for ACA premiums — or consider Barista FIRE, where part-time work with benefits bridges the gap.
Social Security changes this, right? Yes — benefits reduce how much your portfolio must cover, meaning these numbers are conservative. The full planner lets you model lower effective spending.