Coast FI in three numbers
Once your portfolio hits these milestones, compound growth handles the rest.
Have you already hit Coast FI?
You may be closer than you think — find out if your investments can finish the job.
What Is Coast FIRE?
Coast FIRE (also written as Coast FI) is a financial independence milestone that changes how you think about work, saving, and the future. It's not about retiring tomorrow — it's about reaching the point where you've already done the heavy lifting, and compound growth handles the rest.
The Core Concept: You've Saved Enough — Growth Does the Rest
Here's the definition in plain terms: Coast FIRE is the point at which you have enough money invested that — without contributing another dollar — your portfolio will grow to your full FI number by a target retirement age.
That's worth sitting with for a moment. Once you hit Coast FI, your only financial obligation is covering what you spend today. You no longer need to make the most of your 401(k). You no longer need to aggressively save a percentage of your income. You just need to earn enough to pay your current bills.
The name makes sense when you picture it: your investments are the engine, and you've already reached cruising speed. From here, you coast.
A quick example: if you're 30 years old with $250,000 invested, you may already be Coast FI — depending on your expected retirement age and spending needs. The math varies by person, but the concept applies broadly.
Who Is Coast FIRE For?
Coast FI resonates with a wide range of people who want more flexibility before they're fully financially independent:
- Parents with young kids who want to step back to part-time work without derailing their long-term financial picture
- High-stress earners who've built strong savings but feel burned out and want to downshift — without guilt
- Career changers considering lower-paying work they actually care about
- Anyone planning a sabbatical, a move abroad, or a slower season of life
- People who find the full FI number intimidating — Coast FI is a concrete, reachable milestone along the way
Full FI might feel distant. Coast FI often doesn't. That's what makes it a genuinely motivating target for so many people. If this describes you, our Coasting Accumulator's Guide goes deeper into optimizing this phase of your journey.
Coast FIRE vs. Traditional Retirement Planning
Traditional retirement planning follows a familiar script: save continuously from your 20s through your 60s, then draw down your portfolio in retirement. It's linear, and it assumes you'll keep earning — and saving — at roughly the same rate for decades.
Coast FI flips that model. The strategy is to front-load your savings aggressively early on, hit a specific threshold, and then shift gears. After that point, retirement planning becomes a solved problem. Your career decisions stop being driven by how much you need to save and start being driven by what kind of life you actually want to live.
That's the real paradigm shift Coast FIRE offers — not just a different savings strategy, but a fundamentally different relationship with work.
The Coast FIRE Formula: How to Calculate Your Number
Coast FIRE is one of the most concrete milestones in personal finance — because it's built on a real formula, not a vague feeling. Once you understand the math, you can calculate exactly where you stand today.
The Formula
Coast FI Number = FI Number ÷ (1 + expected annual return)^(years until target retirement age)
Breaking down each variable:
- FI Number = Annual Expenses × 25 (based on the 4% rule and your full FI Number)
- Expected annual return = 7% real (inflation-adjusted) for a stock-heavy, index fund portfolio
- Years = Your target retirement age minus your current age
The logic is simple: you're working backwards from the amount you'll need at retirement, then discounting it by how many years compound growth has to work. The result is the lump sum you need invested right now to reach FI without saving another dollar.
Worked Example — Age 25
- Annual expenses: $40,000
- FI Number: $40,000 × 25 = $1,000,000
- Target retirement age: 65 → 40 years of growth
- Coast FI Number: $1,000,000 ÷ (1.07)^40 = $66,780
A 25-year-old who has $67,000 invested in index funds can stop contributing to retirement entirely — and still reach $1 million by age 65. That's the power of starting early.
Worked Example — Age 30
- Annual expenses: $40,000 → FI Number: $1,000,000
- 35 years of growth
- Coast FI Number: $1,000,000 ÷ (1.07)^35 = $93,663
If your spending is closer to $50,000 per year:
- FI Number: $1,250,000
- Coast FI Number: $1,250,000 ÷ (1.07)^35 = $117,079
Five years makes a meaningful difference — your threshold jumps by roughly $27,000 compared to age 25 — but the target is still well under $120,000.
Worked Example — Age 35
- Annual expenses: $40,000 → FI Number: $1,000,000
- 30 years of growth
- Coast FI Number: $1,000,000 ÷ (1.07)^30 = $131,367
At $50,000 in annual expenses:
- Coast FI Number: $1,250,000 ÷ (1.07)^30 = $164,209
For many people at 35 who have been consistently investing in their 401(k) and Roth IRA since their mid-20s, this number may already be within reach.
Worked Example — Age 40
- Annual expenses: $40,000 → FI Number: $1,000,000
- 25 years of growth
- Coast FI Number: $1,000,000 ÷ (1.07)^25 = $184,249
At $50,000 in annual expenses:
- Coast FI Number: $1,250,000 ÷ (1.07)^25 = $230,311
Yes, the threshold rises significantly as you get older — but it's still less than one-quarter of the full FI Number. That gap between Coast FI and full FI is what makes this milestone worth tracking, even if you're getting a later start.
The Growth Rate Matters — A Lot
Your assumed rate of return has a bigger effect on your Coast FI Number than most people expect. Here's how the numbers shift for a 35-year-old targeting $1,000,000 at 65:
| Current Age | 6% Real Return | 7% Real Return | 8% Real Return |
|---|---|---|---|
| 25 | $97,222 | $66,780 | $46,031 |
| 30 | $130,105 | $93,663 | $67,635 |
| 35 | $174,110 | $131,367 | $99,377 |
| 40 | $233,016 | $184,249 | $146,018 |
A single percentage point difference in your assumed return can shift your Coast FI Number by 20–30%. That's not a rounding error — it changes whether you've already hit Coast FIRE or still have years to go.
Why 7% is the standard assumption: The S&P 500 has historically returned roughly 10% nominally and around 7% after adjusting for inflation. Using the real return keeps your math honest — you're planning in today's dollars, not future ones.
When to be more conservative: If you're 10 or more years from Coast FI and want a cushion, run your numbers at 6%. If you hold a meaningful bond allocation or are closer to retirement, a lower figure may better reflect your actual portfolio. For a deeper look at how to build a portfolio that supports these assumptions, visit our Investing 101 guide.
The formula gives you a number. What you do with it — whether you keep saving aggressively, shift to part-time work, or simply stop stressing about contributions — is up to you.
Coast FIRE Number by Age: The Complete Reference Table
Your Coast FI number is the amount you need invested today so that — without adding another dollar — your portfolio grows to full FI by retirement. Once you hit that number, you only need to cover current living expenses, not save for the future.
The tables below use a 7% real (inflation-adjusted) return assumption, which is a reasonable long-run stock market estimate. All figures are rounded to the nearest $1,000.
Coast FI Numbers at 7% Real Return (Retirement at 65)
Annual expenses across the top. Your current age down the left. Find the intersection — that's your Coast FI number.
| Age | $30K/yr | $40K/yr | $50K/yr | $60K/yr | $80K/yr |
|---|---|---|---|---|---|
| 22 | $95,000 | $127,000 | $158,000 | $190,000 | $253,000 |
| 25 | $116,000 | $155,000 | $194,000 | $232,000 | $310,000 |
| 28 | $143,000 | $190,000 | $238,000 | $285,000 | $380,000 |
| 30 | $163,000 | $217,000 | $272,000 | $326,000 | $435,000 |
| 32 | $187,000 | $249,000 | $311,000 | $374,000 | $498,000 |
| 35 | $228,000 | $304,000 | $380,000 | $456,000 | $608,000 |
| 38 | $278,000 | $371,000 | $463,000 | $556,000 | $741,000 |
| 40 | $319,000 | $425,000 | $531,000 | $638,000 | $850,000 |
| 42 | $365,000 | $487,000 | $608,000 | $730,000 | $974,000 |
| 45 | $455,000 | $606,000 | $758,000 | $910,000 | $1,213,000 |
| 50 | $638,000 | $850,000 | $1,063,000 | $1,275,000 | $1,700,000 |
Assumes a 25x FI target (4% withdrawal rate) and 7% real annual growth.
How to Read This Table
- Find your current age in the left column.
- Find your approximate annual expenses across the top — use your actual spending, not your income.
- Compare that number to your invested assets.
If your invested assets are equal to or greater than the number in the table, you are Coast FI.
What counts as invested assets:
- 401(k), IRA, Roth IRA, and other retirement accounts
- Taxable brokerage accounts
- Any other market-invested assets
What does NOT count:
- Home equity
- Cash savings or high-yield savings accounts
- Physical assets like vehicles or collectibles
Coast FI Numbers for Earlier Retirement (Ages 55 and 60)
Want to stop working before 65? A shorter growth runway means your portfolio has less time to compound — so you need more invested today to Coast FI.
| Age Now | Target 60, $50K/yr | Target 55, $50K/yr | Target 60, $80K/yr | Target 55, $80K/yr |
|---|---|---|---|---|
| 30 | $388,000 | $552,000 | $621,000 | $884,000 |
| 35 | $543,000 | $772,000 | $869,000 | $1,235,000 |
| 40 | $760,000 | $1,081,000 | $1,216,000 | $1,729,000 |
| 45 | $1,063,000 | $1,512,000 | $1,701,000 | $2,419,000 |
The tradeoff is clear: pulling your target retirement age back by 5–10 years can raise your Coast FI number by 30–45%. It's still a meaningful milestone — and far below the full FI number you'd need if you stopped investing today — but it's worth understanding before you set your target age.
The FIRE Variants Compared
Five flavors of financial independence — each with different trade-offs on work, spending, and flexibility
Pros & Cons
- You can optimize your career for meaning and flexibility instead of maximum income — a powerful shift once your investments are doing the heavy lifting.
- Part-time work (20–25 hours/week) can fully cover living expenses, freeing up time without requiring you to stop working entirely.
- Geographic flexibility opens up — you can move to a lower-cost area and need to earn even less to cover your expenses.
- Passion projects and side businesses become viable because they no longer need to replace a full salary.
- Coast FI doesn't lock you out of continued saving — every dollar invested beyond your Coast FI number accelerates your path to full FI.
- Employer benefits (health insurance, retirement contributions) remain accessible through part-time roles at companies like Starbucks, Costco, and UPS.
- ACA marketplace plans give self-employed and part-time workers a viable path to health coverage — especially important when leaving full-time employment.
- Healthcare is the biggest practical hurdle — leaving full-time employment means losing employer-sponsored coverage and navigating the ACA or alternative options on your own.
- Lower income can feel psychologically uncomfortable, even when the math shows it's sufficient — especially if your identity has been tied to career achievement.
- Passion projects and freelance work can take years to become stable income sources, requiring patience and a reliable expense baseline.
- Sequence-of-returns risk still matters — a major market downturn early after hitting Coast FI could extend your timeline to full FI if you've stopped saving entirely.
- Part-time or seasonal work may not always be available in your field or location, limiting how quickly you can pivot away from full-time employment.
- Coast FI calculations assume consistent long-term growth — real-world variables like inflation, lifestyle inflation, or unexpected expenses can shift your actual number.
How to Verify Your Coast FIRE Status
Four steps to find out if you're already coasting
Calculate your FI Number: Annual Expenses × 25
Calculate your Coast FI Number using the formula or reference table above
Tally invested assets: 401(k), IRA, brokerage, HSA
Compare: if invested assets ≥ Coast FI number, you're coasting
Calculate your FI Number: Annual Expenses × 25
Calculate your Coast FI Number using the formula or reference table above
Tally invested assets: 401(k), IRA, brokerage, HSA
Compare: if invested assets ≥ Coast FI number, you're coasting
How to Verify Your Coast FIRE Status
Coast FIRE isn't a feeling — it's a math checkpoint. Here's how to run the numbers cleanly.
Step 1 — Calculate Your FI Number
Your FI number is your annual expenses multiplied by 25. This comes from the 4% rule: a portfolio 25x your spending should support you indefinitely.
Annual Expenses × 25 = FI Number
The key word is actual expenses — not what you wish you spent. Pull 12 months of real spending data from your bank and credit card statements. If you're not sure where your money goes, calculating your savings rate will surface your true spending automatically, since savings rate is just income minus what you actually spend.
Once you have a number you trust, use the FI Number calculator to confirm your math.
Step 2 — Calculate Your Coast FI Number
Your Coast FI number is the lump sum you need invested today so that — without adding another dollar — it grows to your FI number by your target retirement age.
Coast FI Number = FI Number ÷ (1 + 0.07)^years
Where years is the time between now and when you plan to stop working. Use 7% as a conservative real return estimate. Or skip the math entirely and reference the table earlier on this page to find your number based on age and target retirement date.
Step 3 — Tally Your Invested Assets
Add up balances from accounts where money is actually invested and growing:
- 401(k) and 403(b)
- Traditional IRA and Roth IRA
- Taxable brokerage accounts
- HSA (the invested portion only — not your cash buffer)
Do not include: home equity, cash savings accounts, crypto held outside a diversified index fund, or personal property. These either can't compound predictably or aren't liquid in the way Coast FIRE math assumes.
Step 4 — Compare the Numbers
This is the moment of truth:
- Invested assets ≥ Coast FI number? You've hit Coast FIRE. You can stop (or significantly reduce) contributions and let compounding do the rest.
- Close but not there? Divide the gap by your current monthly savings rate to find out exactly how many more months of contributions you need.
For more sophisticated modeling — including tax bracket projections and Social Security estimates — run your numbers through the Early Retirement Calculators.
Common Coast FIRE Mistakes and Misconceptions
Coast FIRE is one of the more straightforward FI milestones to calculate — but a few consistent errors can leave you with a number that's dangerously optimistic or unnecessarily conservative.
Using Nominal Returns Instead of Real Returns
The single most common mistake. If you use 10% average stock market returns without adjusting for inflation, your Coast FI number will look much lower than it should be. Always use real returns (typically 7%) — otherwise you'll think you've hit Coast FI years before you actually have.
Ignoring Lifestyle Inflation
Your Coast FI number is anchored to your current annual expenses. If those expenses grow — a bigger house, kids, lifestyle creep — your FI number grows with them, and your Coast FI number shifts accordingly. Recalculate annually with actual spending, not the number you used three years ago. An annual expense audit can help you catch lifestyle creep before it moves your goalposts.
Counting Assets That Aren't Invested
Home equity, cash in a savings account, a paid-off car — these are assets, but they're not compounding at 7% annually in the stock market. Your Coast FI calculation only works with money that's actually invested and growing. Be honest about what counts.
Treating Coast FI as Full Retirement
Coast FI doesn't mean you can stop working entirely. It means you no longer need to save for retirement — but you still need income to cover your current expenses. If your expenses are $40,000/year, you still need to earn $40,000/year from somewhere.
Picking an Unrealistic Retirement Age
Using 65 gives you the lowest Coast FI number because your money has the longest runway. But if you actually plan to stop working at 55, your number could be 40–50% higher. Choose a target age that reflects your real intentions, not the one that produces the most flattering number.
Forgetting About Healthcare
If Coast FI means leaving a full-time job with employer-sponsored health insurance, you need to factor in the cost of ACA marketplace coverage or alternative plans. For a family of four, that can add $15,000–$25,000/year to your expenses — which raises both your FI number and your Coast FI number.
Calculate your Coast FI number right now
Three steps to find out if you're closer than you think.
Calculate your FI number
10 minutesAnnual expenses × 25. If you spend $40,000/year, your FI number is $1,000,000. If you spend $60,000, it's $1,500,000.
Pro tip: Use your actual spending, not your income. Track expenses for a month if you haven't already.
Run the Coast FI formula
5 minutesCoast FI = FI Number ÷ (1.07)^years until target retirement. At 35 targeting retirement at 60: $1,000,000 ÷ (1.07)^25 = ~$184,000.
Pro tip: Use 7% for inflation-adjusted returns. If you want to be conservative, use 6%.
Compare to your current portfolio
15 minutesAdd up all investable assets: 401(k), IRA, Roth IRA, brokerage, HSA. If the total exceeds your Coast FI number, you've already hit Coast FI. If not, you know exactly how much further you need to go.
When Can You Stop Saving?
Our free calculator shows you exactly when you can stop saving and let compound growth do the rest. Create a free account to run your numbers.
- Thermometer bars showing Coast FI at every retirement age
- Barista FI scenarios — work part-time and still retire on time
- Save your results and track progress over time
Free forever — no credit card required
Your Coast FI Number
$340,000
6 years of saving hard, then coast
Coast Progress by Retirement Age
32
Current Age
38
Coast Age
60
Retire
Preview — create free account to use
Frequently Asked Questions
Coast FIRE is the point where your invested assets will grow to your full FI number through compound growth alone — no additional contributions needed — by a target retirement age. Once you hit Coast FI, you only need to earn enough to cover your current living expenses. Your portfolio does the heavy lifting from there.
Use this formula: Coast FI Number = FI Number ÷ (1 + growth rate)^years until retirement. Your FI number is your annual expenses multiplied by 25. For the growth rate, 7% real (inflation-adjusted) return is the standard assumption based on long-term stock market averages. For example, if you spend $40K per year, your FI number is $1,000,000. If retirement is 35 years away, your Coast FI number is roughly $131,000.
It depends on your annual expenses and when you want to reach full FI. For someone spending $40,000 per year targeting age 65, using a 7% real return: at age 25 you need roughly $67,000; at 30, about $94,000; at 35, about $131,000; and at 40, about $184,000. The earlier you hit Coast FI, the smaller the number — because your investments have more time to compound.
Coast FIRE is a math milestone: your investments are on track to reach your FI number by retirement age without further contributions. Barista FIRE is a lifestyle strategy: you work part-time to cover the gap between your investment income and living expenses. These two concepts are related but distinct. You can be Coast FI while still working full-time, or be living a Barista FIRE lifestyle without having technically reached your Coast FI number yet.
Not on its own. Coast FIRE is built around a traditional retirement age — typically 65 — which means your portfolio grows to your FI number by then, not sooner. What Coast FIRE gives you right now is career flexibility: you can step back, take a lower-paying role, or reduce hours without derailing your long-term financial picture. To actually retire early, you'd need to keep saving past your Coast FI number until your portfolio can support full withdrawals immediately.
It depends on your age and annual expenses. At age 30 with $40,000 in annual expenses, your Coast FI number is roughly $94,000 — so $250,000 puts you well past that threshold. At age 40 with $50,000 in annual expenses, your Coast FI number is approximately $230,000 — so $250,000 is right at the line. Use the reference table in this guide to match your specific age and spending to your Coast FI target.
The standard assumption is 7% real annual return — that's inflation-adjusted — based on the historical average of a broadly diversified stock portfolio. Use 6% if you want a more conservative estimate, or 8% if you're comfortable with a slightly more optimistic projection. Avoid using nominal returns of 10% or higher: they ignore inflation and will make your Coast FI position look stronger than it actually is, which can lead to underestimating how much you still need.
Start Your Coast FIRE Path Today
Coast FI is arguably the most psychologically freeing milestone in the financial independence framework — and for many people, it's the most achievable one too.
It reframes the entire challenge. Instead of staring down a $1.5 million target that feels impossibly distant, you're asking a much simpler question: Can I cover my living expenses right now? That's a problem you can actually solve.
Whether you're 25 with $70,000 already invested or 40 with $200,000 set aside, you may be closer to Coast FI than you think. And if you're not there yet, the math tells you exactly how many months of focused saving stand between you and that milestone. That clarity alone is worth something.
Your Next Steps
- Calculate your number — use the reference tables above to find your Coast FI target based on your current age and planned retirement age
- Check your status — you might already be coasting and not know it
- Share your progress — tell the ChooseFI community where you stand; accountability and encouragement go a long way
Thousands of ChooseFI community members are actively tracking their progress toward Coast FI and beyond. Some are in the accumulation phase, some have already hit their Coast number, and others are somewhere in between — all comparing notes and supporting each other along the way.
Join the ChooseFI community to connect with people who get it.
New to the FI concept? Start with our Getting Started with Financial Independence guide or, if you're under 25, the Early Starter's Guide to FI.
Want the full picture of how Coast FI fits into the broader framework? Read The Pillars of Financial Independence for a complete breakdown of every major FI milestone.
The Bottom Line
Coast FI is the most liberating milestone on the path to financial independence. It's the moment the math shifts in your favor permanently — compound growth handles retirement, and you only need to cover current expenses. For many people, that means the freedom to downshift careers, work part-time, move abroad, or pursue work they love regardless of pay. You may be closer to Coast FI than you think. Run the numbers.
Coast FI at 30 (retire at 60)
~$180K
Coast FI at 35 (retire at 60)
~$255K
Savings needed after hitting Coast FI
$0