What Is Coast FIRE? The Number That Lets You Stop

Last Updated: May 12, 2026

[!NOTE] The Quick Verdict:

• Coast FIRE = the invested portfolio amount that grows to your retirement target via compounding alone — no new contributions required
• The formula: Coast number = Retirement target ÷ (1.07)^years to retirement
• Why it matters: It’s often achievable 10–15 years before full FIRE — and once you hit it, the urgency of aggressive saving disappears
• Find your number: Use our Coast FIRE Benchmark to see your Coast FIRE target by age and income

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Saving aggressively for retirement is stressful. The destination feels impossibly far, the market fluctuates, and any setback — a medical bill, a job loss, a bad year — seems to erase years of progress.

Coast FIRE reframes the problem. Instead of asking “how much do I need to retire?” it asks a different question: “how much do I need invested right now so I never have to worry about retirement saving again?”

The answer is almost always a much smaller, more achievable number. And for many people, they are already closer than they think.

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The Coast FIRE Concept, Explained Simply

Compounding is the mechanism. If you invest $276,500 today at 7% annual return, it becomes $1,500,000 in 25 years without you touching it.

Once you have $276,500 invested and 25 years until retirement, you have hit your Coast FIRE number — assuming a $1,500,000 retirement target.

You can, at that point, stop contributing to retirement entirely. You can take a lower-paying job. You can work part-time. You can pursue passion projects that don’t pay well. Your retirement is already “funded” — compounding will take it the rest of the way.

That’s Coast FIRE. You’re coasting.

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The Coast FIRE Formula

Coast FIRE Number = Retirement Portfolio Target ÷ (1 + r)^n

Where:

• Retirement Portfolio Target = your full FIRE number (typically 25× annual spending)
• r = expected annual return (typically 0.07 for 7%)
• n = years until you plan to retire

Example calculation:

• Annual expenses: $60,000
• Retirement target (25×): $1,500,000
• Years to retirement (retiring at 65, currently 35): 30 years
• Expected return: 7%

Coast FIRE Number = $1,500,000 ÷ (1.07)^30 = $1,500,000 ÷ 7.612 = $197,094

At 35 years old, if you have $197,094 invested, your retirement is mathematically funded. You can redirect every future dollar of income toward your current lifestyle — not retirement savings.

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Coast FIRE Numbers by Age — At a Glance

Assuming $1,500,000 retirement target at age 65, 7% return:

Current Age	Years to Retire	Coast FIRE Number
25	40 years	$102,843
30	35 years	$144,259
35	30 years	$197,094
40	25 years	$276,500
45	20 years	$387,720
50	15 years	$543,844
55	10 years	$762,895

Key insight: The earlier you hit your Coast FIRE number, the more powerful it is. Reaching $197,094 at age 35 means 30 years of compounding does all the heavy lifting. Waiting until 45 to hit $276,500 means 20 years of compounding — still excellent, but the required number is 40% higher.

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How to Calculate Your Personal Coast FIRE Number

Step 1 — Determine your retirement spending target. What do you expect to spend annually in retirement? Use your current spending as a baseline, adjusted for anticipated changes (no mortgage, no commute, more travel, healthcare).

Step 2 — Calculate your retirement portfolio target. Retirement portfolio = Annual spending × 25 (the 4% safe withdrawal rate rule)

• $40,000/year → $1,000,000
• $60,000/year → $1,500,000
• $80,000/year → $2,000,000
• $100,000/year → $2,500,000

Step 3 — Determine your timeline. When do you want to retire? Most people use 65, but 55 or 60 are common FIRE targets.

Step 4 — Apply the formula. Coast FIRE Number = Retirement target ÷ (1.07)^years to retirement

Step 5 — Compare to your current portfolio. Log into your brokerage, 401(k), IRA, and Roth IRA. Add all investment balances. If you have hit or exceeded your Coast FIRE number: you have optionality. If not: track the gap.

[!TIP] Use our Coast FIRE Benchmark to run this calculation at multiple return rates (6%, 7%, 8%) and see how sensitivity to your assumed return changes your Coast number. Small differences in assumed return create large differences in the number over 25+ year horizons.

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The Psychology of Coast FIRE

The behavioral effect of hitting Coast FIRE is as important as the math.

Before Coast FIRE: Every dollar not invested feels like a retirement delay. Career decisions are filtered through “will this set back my savings rate?” Spending feels guilty. The destination feels perpetually out of reach.

After Coast FIRE: Retirement is handled. Today’s income is for today’s life. A lower-paying job that offers more meaning, flexibility, or joy is no longer a retirement-derailing decision — it is just a lifestyle choice. A sabbatical does not push back retirement. A slow year does not erase years of progress.

Many people report that reaching Coast FIRE is more psychologically liberating than actually reaching full FIRE. Full FIRE requires you to quit working or generate enough passive income to cover all expenses. Coast FIRE just requires that you cover current costs — a much lower bar that still eliminates the retirement anxiety that drives most burnout.

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Coast FIRE in Practice: What People Actually Do

The Coast Barista: Hit Coast FIRE and took a part-time retail or service job that covers living expenses without the stress of a high-income career. No retirement contributions needed. Maximum flexibility.

The Coast Freelancer: Left a corporate job after hitting Coast FIRE to freelance in the same field at lower intensity. Works 20–30 hours/week, covers expenses, stops contributing to retirement. Keeps the professional skills without the 60-hour weeks.

The Coast Saver: Hit Coast FIRE and continued contributing anyway — but at a much lower, less stressful rate. Uses the Coast milestone as permission to spend more now, guilt-free, while still building a buffer.

The Coast Parent: Hit Coast FIRE before having children. Took a significant pay cut to work a more family-friendly job. The retirement math works without the income required before.

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Limitations of the Coast FIRE Framework

1. It assumes steady compounding. Real markets do not return 7% every year. A severe bear market the year after you declare Coast FIRE could reset your calculations. Coast FIRE is a probabilistic framework, not a guarantee. Run the numbers at 5–6% as well.

2. It does not account for Social Security. If you include projected Social Security income in your retirement plan, your retirement portfolio target decreases — which lowers your Coast FIRE number significantly. Many Coast FIRE calculations are conservative in omitting this.

3. Healthcare is a wildcard. If you retire before 65 (or reduce work hours to the point of losing employer health insurance), you need to fund healthcare premiums out of pocket. This can add $10,000–$25,000/year to your annual spending, raising your retirement target and therefore your Coast FIRE number.

4. Lifestyle inflation. If your spending increases substantially between now and retirement, your current Coast FIRE number (based on current spending × 25) understates the real target. Model future spending, not just current spending.

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The Sequence of FIRE Milestones

Most people targeting financial independence move through these milestones sequentially:

1. $0 net worth → Getting out of debt
2. 1× annual expenses invested → First meaningful milestone
3. Coast FIRE → Retirement is “funded” — current income covers current life only
4. Lean FIRE → 25× of a minimal lifestyle — technically retired but tight
5. Full FIRE → 25× of current lifestyle — fully financially independent
6. Fat FIRE → 25–33× of a higher lifestyle — retired with flexibility

Coast FIRE sits at a powerful inflection point. It is often achievable while you are still young enough to pivot careers, change lifestyles, or take risks. Full FIRE typically requires another decade of disciplined savings after Coast FIRE — but that decade no longer has to be anxiety-driven.

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Am I On Track for Coast FIRE?

Quick benchmark check (7% return, retire at 65):

Age	$50k/yr spending	$75k/yr spending	$100k/yr spending
25	$68,562	$102,843	$137,124
30	$96,173	$144,259	$192,346
35	$131,396	$197,094	$262,791
40	$184,333	$276,500	$368,666
45	$258,480	$387,720	$516,960
50	$362,563	$543,844	$725,126

These are the invested amounts needed right now to reach full retirement — no future contributions.

Compare these numbers to your current investment portfolio (401k + IRA + brokerage). The gap tells you how much more time or savings are needed before you reach Coast FIRE.

For a personalized calculation with your exact income, spending, current savings, and timeline, use the Coast FIRE Benchmark — it runs multiple return rate scenarios and shows your expected Coast FIRE date given your current savings rate.

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The Bottom Line

Coast FIRE is not retirement. It is permission.

Permission to work less. Permission to earn less. Permission to take career risks. Permission to stop treating every financial decision as a retirement-urgency question.

The math is simple: your portfolio grows whether you contribute or not. Once it is large enough that compounding alone reaches your target, you are coasting. The hard part is building to that number — and then recognizing when you’ve arrived.

Check your portfolio balance. Run the formula. You may be closer to Coast FIRE than you think.

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Financial Disclaimer: Coast FIRE calculations use assumed future returns that are not guaranteed. Market performance, inflation, tax law changes, and personal circumstances all affect retirement outcomes. This content is for educational purposes only and does not constitute financial advice. Consult a licensed financial advisor for personalized retirement planning.