Coast FIRE Explained: When Can You Stop Contributing?
Coast FIRE is the crossover point where your invested assets, left untouched, will compound to your full financial independence number by traditional retirement age — without any additional contributions. A 35-year-old who needs $1.5 million at 65 and assumes 7% real returns needs only about $197,000 invested today to "coast" there.
The Coast FIRE Formula
Coast FIRE Number = Full FI Number ÷ (1 + r)^years
Where: - Full FI Number = your 25x annual expenses (or 30x for 40+ year retirement) - r = expected real (after-inflation) annual return (typically 5–7%) - years = years until you want to reach your Full FI Number
Example 1: Age 35, full FI number of $1.5 million, targeting 65 (30 years), 7% real return: $1,500,000 ÷ (1.07)^30 = $1,500,000 ÷ 7.612 = approximately $197,000
Example 2: Age 40, full FI number of $2 million, targeting 65 (25 years), 6% real return: $2,000,000 ÷ (1.06)^25 = $2,000,000 ÷ 4.292 = approximately $466,000
Example 3: Age 30, full FI number of $1.25 million, targeting 60 (30 years), 7% real return: $1,250,000 ÷ (1.07)^30 = approximately $164,000
The earlier you reach Coast FIRE, the lower the number — because time is the most powerful variable in compounding.
What "Coasting" Actually Means for Your Life
Reaching Coast FIRE doesn't mean you can stop working entirely. It means you can stop optimizing work around maximum savings rate. The practical freedom is significant:
You can take a pay cut without guilt — switching to meaningful but lower-paying work, accepting a job with worse compensation but better culture or location, or reducing hours to 30–40% of full time.
You can stop maxing tax-advantaged accounts if you find better uses for the income (paying down a mortgage faster, funding a business, or simply enjoying life more in your 30s and 40s).
You can use your income exclusively for living expenses because the retirement savings problem is already solved by your invested assets.
The psychological shift of hitting Coast FIRE is often described as one of the most liberating financial milestones. It transforms the relationship with work: you're no longer financially compelled to keep a specific job. You work because you choose to — and the income you earn is a bonus, not a necessity for long-term financial security.
The Assumptions: What Could Go Wrong
The Coast FIRE calculation depends heavily on the assumed real return. At 7%, money doubles roughly every 10 years. At 5%, it doubles every 14 years. The difference matters enormously over 30-year horizons.
If you assume 7% but actually earn 5% real returns (a plausible outcome in a lower-growth environment), your $197,000 at age 35 grows to only $830,000 at 65 instead of $1.5 million — a $670,000 shortfall.
For this reason, conservative planners use 5–5.5% real returns in Coast FIRE calculations, or cross-check the calculation against both 5% and 7% scenarios. Using a lower return assumption results in a higher Coast FIRE number (more cushion needed).
Also critical: Coast FIRE assumes you do not touch the money — no withdrawals, no loans. If you take a year out of the workforce during a recession and need to draw down savings for living expenses, the clock restarts. The coasting lifestyle requires a separate income stream (job, side income, spouse's income) to cover expenses entirely.
Barista FIRE vs. Coast FIRE: The Key Difference
Barista FIRE and Coast FIRE are often confused because they're both "semi-retirement" concepts, but they work differently.
Coast FIRE: You've invested enough that compounding alone will reach your number. You continue working to cover living expenses but no longer need to save. You're coasting.
Barista FIRE: You're fully financially independent but choose to work part-time — often for health insurance, social connection, or modest additional income. The "barista" name comes from the idea of working part-time at a coffee shop primarily to get employer-sponsored health coverage. You've already crossed the FI threshold.
Barista FIRE requires a much larger portfolio than Coast FIRE, because you need enough invested to (partially) fund retirement now, not decades from now. A BaristaFIRE retiree might need a $1 million portfolio that supports $30,000/year in withdrawals, supplemented by $15,000/year in part-time income for total expenses of $45,000.
Both approaches reflect the same underlying insight: "enough" doesn't require full traditional retirement or maximum accumulation. The FIRE spectrum allows for many intermediate states of financial freedom.
How Coast FIRE Relates to a Paid-Off Mortgage
Home equity and Coast FIRE interact in an interesting way. Many FIRE planners note that reaching Coast FIRE while also having a fully paid-off mortgage creates a particularly powerful combination.
A paid-off home eliminates what is typically the largest single expense in most households' budgets. If that $18,000–$24,000/year in mortgage payments disappears, the full FIRE number required from investments drops dramatically — often by $450,000–$600,000 at a 4% withdrawal rate.
For example: a couple spending $70,000/year including mortgage needs a $1.75 million portfolio (25x). The same couple with a paid-off home and $46,000/year in other expenses needs only a $1.15 million portfolio — $600,000 less. Their Coast FIRE number drops proportionally.
This is why many FIRE-focused households target paying off the mortgage either before or around the same time as hitting Coast FIRE. The two milestones together represent a qualitatively different level of financial security than either does alone.
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Frequently Asked Questions
How do I calculate my Coast FIRE number?
Divide your full FI number (25x annual expenses) by (1 + return rate)^years_to_retirement. For a 35-year-old targeting $1.5 million at 65 with 7% real returns: $1,500,000 ÷ (1.07)^30 ≈ $197,000. Use our Coast FIRE calculator to run your specific numbers with different return assumptions.
Can I include my home equity in Coast FIRE?
You can include home equity if you plan to downsize, sell, or use a reverse mortgage in retirement. However, primary residence equity is illiquid and most people don't want to rely on selling their home. Conservative Coast FIRE calculations use only invested liquid assets.
What return rate should I use for Coast FIRE?
Use real (after-inflation) returns. Historically, U.S. equities have returned approximately 7% real annually over long periods. For a more conservative estimate, 5–6% real return is appropriate. Running the calculation at both 5% and 7% shows you the range — the 5% result gives you a more cautious Coast FIRE number.
What's the difference between Coast FIRE and regular FIRE?
Regular FIRE means your portfolio is large enough right now to fund your retirement with a safe withdrawal rate — you could stop working today. Coast FIRE means your portfolio will grow to that size by a future date through compounding alone, without additional contributions. You still need to work to cover current expenses, but you've solved the long-term retirement savings problem.
How is Barista FIRE different from Coast FIRE?
Coast FIRE still requires working full-time (or at least enough to cover expenses); you've just stopped needing to save. Barista FIRE means you've already reached or nearly reached full FI and work part-time by choice — often for health insurance, social structure, or modest income. Barista FIRE requires a much larger portfolio than Coast FIRE.
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