Coast FIRE is the financial milestone where your existing investment portfolio is large enough that compound returns will grow it to your full retirement target by your planned retirement age—even if you never contribute another dollar. After reaching this threshold, you only need enough earned income to pay for current living expenses. New to Coast FIRE? Read what Coast FIRE means →
The figures below provide illustrative benchmark amounts across various ages and spending levels. These numbers are intended as educational reference markers to visualize compounding across decades, not universal requirements, mandatory targets, or personalized financial advice.
How to Read the Benchmark Table
Every cell in the matrix represents the estimated lump-sum investment balance needed today at that specific age to reach full retirement by age 65 under a standardized set of baseline assumptions. Before reviewing the matrix, keep the following core assumptions in mind:
Baseline Assumptions Used in This Table
- Retirement age 65: All calculations assume compounding continues until age 65, with zero further contributions made during the accumulation window.
- Annual retirement spending in today's dollars: Spending tiers ($40,000 to $100,000 per year) represent current purchasing power, keeping targets straightforward and inflation-adjusted.
- 4% withdrawal-rate planning assumption: Full FIRE targets assume a standard 4% annual withdrawal rate (Bengen and Trinity Study convention), meaning the target retirement nest egg is 25× annual spending.
- 7% real (inflation-adjusted) annual return: Reflects the long-term historical average of broad US equity markets after adjusting for inflation (~10% nominal minus ~3% inflation).
- No taxes, fees, or account-type modeling: The table assumes clean compound growth with no drag from fund expense ratios, advisory fees, capital gains taxes, or tax brackets across Roth, Traditional, or taxable accounts.
- No guarantee of future returns: Market returns fluctuate over time and can be lower or higher than historical norms over any specific multi-decade span.
Coast FIRE Benchmark Matrix by Age and Annual Spending
All figures are rounded to the nearest $1,000 for clarity and displayed in today's dollars. Compounding assumes a 7% real annual return and retirement at age 65 using a 4% withdrawal rate.
| Current Age | Years to 65 | $40,000 / yr ($1.0M FIRE target) |
$60,000 / yr ($1.5M FIRE target) |
$80,000 / yr ($2.0M FIRE target) |
$100,000 / yr ($2.5M FIRE target) |
|---|---|---|---|---|---|
| Age 20 | 45 yrs | $48,000 | $71,000 | $95,000 | $119,000 |
| Age 25 | 40 yrs | $67,000 | $100,000 | $134,000 | $167,000 |
| Age 30 | 35 yrs | $94,000 | $140,000 | $187,000 | $234,000 |
| Age 35 | 30 yrs | $131,000 | $197,000 | $263,000 | $328,000 |
| Age 40 | 25 yrs | $184,000 | $276,000 | $368,000 | $461,000 |
| Age 45 | 20 yrs | $258,000 | $388,000 | $517,000 | $646,000 |
| Age 50 | 15 yrs | $362,000 | $544,000 | $725,000 | $906,000 |
Why Age Dramatically Changes the Required Number
The mathematical foundation of Coast FIRE is an exponential present-value discounting calculation:
Coast FIRE Number = Full FIRE Target ÷ (1 + r)(65 - Age)
For a detailed breakdown of the two-stage math and return sensitivity, see our Coast FIRE formula guide.
Because returns compound exponentially rather than linearly, time in the market is the primary driver of the result. At a 7% real return, invested capital doubles approximately every 10.2 years (the Rule of 72):
- Age 25 (40 years of runway): Capital has almost 4 full doubling periods. Each dollar invested today compounds into roughly $15.00 by age 65. Compound interest produces about 93% of the eventual balance.
- Age 35 (30 years of runway): Capital has approximately 3 doubling periods. Each dollar invested multiplies into roughly $7.61.
- Age 45 (20 years of runway): Capital has approximately 2 doubling periods. Each dollar invested multiplies into roughly $3.87.
- Age 50 (15 years of runway): Capital has 1.5 doubling periods. Each dollar invested multiplies into roughly $2.76.
This compounding runway explains why an age-25 saver targeting a $1.5M nest egg only needs ~$100,000 invested today, while an age-50 saver with the identical goal requires ~$544,000. Each additional decade of compounding substantially reduces the upfront capital needed.
Worked Age Examples
The following examples demonstrate how specific ages, time horizons, and retirement budgets translate into concrete Coast FIRE milestones using the baseline formula:
Age 25: $60,000 Annual Spending ($1.5M Target)
A 25-year-old expecting to spend $60,000 annually in retirement targets a Full FIRE portfolio of $1,500,000 ($60,000 ÷ 0.04). With 40 years until age 65, the required investment today is:
$1,500,000 ÷ (1.07)40 ≈ $100,171 (rounded to ~$100,000)
Saving $100,000 by age 25 is challenging, but reaching it allows someone in their mid-twenties to know their core retirement is fully funded by compound growth, freeing up future earnings for immediate life goals.
Open this age 25 scenario in the calculator →Age 30: $60,000 Annual Spending ($1.5M Target)
With a 35-year compounding window until age 65, the same $1,500,000 retirement goal requires:
$1,500,000 ÷ (1.07)35 ≈ $140,494 (rounded to ~$140,000)
Comparing age 25 to age 30 highlights the cost of delay: five fewer years of compounding increases the required balance by roughly $40,000 (from ~$100,000 to ~$140,000), or about $8,000 per year of elapsed time.
Open this age 30 scenario in the calculator →Age 40: $80,000 Annual Spending ($2.0M Target)
An individual or couple at age 40 targeting $80,000 in annual retirement spending needs a $2,000,000 nest egg ($80,000 ÷ 0.04). Over the 25 years until age 65, the Coast threshold is:
$2,000,000 ÷ (1.07)25 ≈ $368,498 (rounded to ~$368,000)
At age 40, having $368,000 invested means compounding will still generate roughly 81% of the final $2,000,000 balance ($1.63M in growth). This frees a 40-year-old to downshift hours, change professions, or stop stressful overtime without endangering retirement.
Open this age 40 scenario in the calculator →Age 50: $80,000 Annual Spending ($2.0M Target)
With 15 years remaining until age 65, funding a $2,000,000 portfolio requires:
$2,000,000 ÷ (1.07)15 ≈ $724,892 (rounded to ~$725,000)
Even with just 15 years remaining, compounding still does substantial work, multiplying the $725,000 starting sum into $2.0M (adding almost $1.28M in compound gains). Coast FIRE is not restricted to 20-somethings; older savers can also achieve autonomy from mandatory retirement savings.
Open this age 50 scenario in the calculator →What These Benchmarks Do Not Tell You
While benchmark tables are useful for building financial intuition, real-world retirement planning includes critical variables that cannot be captured in a single static calculation:
1. Tax Treatment and Account Types
A $1,500,000 balance in a pre-tax traditional 401(k) or IRA is subject to ordinary income taxes upon withdrawal, whereas a Roth IRA provides tax-free withdrawals, and taxable brokerage accounts face capital gains taxes. Depending on your tax rate, your pre-tax savings target may need to be higher to support your desired after-tax spending.
2. Investment Fees and Expense Ratios
A portfolio paying 0.75% in annual advisory fees or mutual fund expense ratios reduces an expected 7.0% real return to 6.25%. Over 30 years, that fee drag can increase the required starting capital by tens of thousands of dollars.
3. Future Return Variability
A 7% real return is a historical multi-decade average, not a guaranteed annual rate. Actual market performance arrives in lumpy, unpredictable cycles with severe market corrections and multi-year bull runs. If real returns average 5% instead of 7%, required savings amounts increase significantly.
4. Spending Changes Over a Lifetime
Retirement spending rarely stays constant across four decades. Expenses typically shift as mortgages are paid off, children leave home, or late-life healthcare costs emerge. A fixed annual spending assumption should be continually revisited.
5. Asset Allocation and Sequence of Returns Risk
As investors approach retirement, they often increase allocations to bonds or cash to reduce portfolio volatility. Lower volatility generally brings lower expected real returns. Furthermore, experiencing an equity downturn right before or early in retirement (sequence of returns risk) can permanently reduce portfolio longevity.
Use Your Own Numbers
Benchmark tables provide helpful general guidelines, but your financial path is unique. Use the interactive calculator to enter your exact age, current savings, annual contribution rate, target retirement age, and personalized return assumptions.
Calculate Your Personalized Coast FIRE Number →Last updated: September 27, 2026
Educational Disclaimer: This page and benchmark table are provided solely for educational and illustrative purposes, not personalized financial, investment, or tax advice. All calculations are mathematical models based on hypothetical assumptions and do not guarantee future investment results. Consult a qualified fiduciary financial professional before making retirement planning decisions.