Fat FIRE means financial independence on an affluent budget β typically $100K+/year in spending. Your FIRE number is usually $2.5M or more. Find out exactly when you can retire wealthy.
Fat FIRE formula: Target Annual Spending Γ· SWR = FIRE Number. At $10,000/month ($120,000/year) and 4% SWR: $3,000,000 target β vs $2,500,000 for $100K/year. Higher spending, bigger number.
π° Fat FIRE Number
$3,000,000
$10,000/mo Γ 12 Γ· 4%
Years to FIRE
17
Retire at age 52
Your Progress
10%
of Fat FIRE target
Monthly savings needed to Fat FIRE in 3, 5, or 10 years:
FIRE in 10 years
$13,923/mo
FIRE in 5 years
$36,026/mo
FIRE in 3 years
$65,927/mo
Savings growth projection β $300K saved + $72K/yr at 7% real return
β On track β projected to reach Fat FIRE in 17 years at this savings rate. Assumes 7% real annual return. Not a guarantee.
Felix, your AI CFO, coordinates your 401(k), Roth IRA, HSA, and taxable brokerage with asset location and a tax-efficient withdrawal order β so a $2.5M+ Fat FIRE portfolio actually delivers $100K+/year after tax.
Build Your Fat FIRE Plan β FreeHow much you need invested based on target annual spending and withdrawal rate. Every $10,000/year of extra spending adds $250,000 to your target (at 4% SWR).
| Annual Spending | 3% SWR | 3.5% SWR | 4% SWR β |
|---|---|---|---|
| $80,000/yr ($6,667/mo) | $2.67M | $2.29M | $2.00M |
| $100,000/yr ($8,333/mo) | $3.33M | $2.86M | $2.50M |
| $120,000/yr ($10,000/mo) | $4.00M | $3.43M | $3.00M |
| $150,000/yr ($12,500/mo) | $5.00M | $4.29M | $3.75M |
| $200,000/yr ($16,667/mo) | $6.67M | $5.71M | $5.00M |
| $250,000/yr ($20,833/mo) | $8.33M | $7.14M | $6.25M |
4% SWR (multiply spending by 25) is the Trinity Study standard. Use 3.5% if retiring before age 45 for a longer safety margin. Figures are pre-tax β budget your effective tax rate into the annual number.
Fat FIRE (Fat Financial Independence, Retire Early) is reaching full financial independence while preserving an affluent lifestyle β typically $100,000+ per year in spending. Unlike Lean FIRE (under $40K/year) or Regular FIRE ($40K-$80K/year), Fat FIRE is about freedom without trade-offs: keep the house in a high-cost city, the travel, and the discretionary budget.
The catch is the size of the target. At the 4% rule, $100K/year needs $2.5M, $150K/year needs $3.75M, and $200K/year needs $5M. Because the number is large and early retirements span 40-50 years, many Fat FIRE planners use a more conservative 3.25%-3.5% withdrawal rate and pay close attention to tax efficiency, asset location, and pre-Medicare healthcare costs β the line items that most often separate a realistic Fat FIRE plan from an optimistic one.
| FIRE Type | Annual Spending | Portfolio Needed | Still Working? |
|---|---|---|---|
| Lean FIRE πΏ | $20Kβ$40K | $500Kβ$1M | No |
| Barista FIRE β | Any amount | Reduced by PT income | Part-time |
| Coast FIRE β΅ | Any amount | Partial (coasts to full) | Full-time (cover expenses) |
| Regular FIRE π₯ | $40Kβ$80K | $1Mβ$2M | No |
| Fat FIRE π° | $100K+ | $2.5M+ | No |
Fat FIRE is Financial Independence, Retire Early achieved with an affluent lifestyle β typically $100,000 or more per year in spending. Unlike Lean FIRE (under $40K/year) or Regular FIRE ($40K-$80K/year), Fat FIRE preserves a premium standard of living: a home in a high-cost city, regular travel, private healthcare, and no need to budget tightly. Using the 4% safe withdrawal rate, Fat FIRE generally requires a portfolio of $2.5 million or more.
Your Fat FIRE number is 25 times your target annual spending (the 4% rule). For $100,000/year: $2,500,000. For $150,000/year: $3,750,000. For $200,000/year: $5,000,000. Retirees who want extra safety over a 40-50 year horizon use a 3.5% withdrawal rate (about 28.6Γ), which raises a $100K/year target to roughly $2.86M and a $150K/year target to about $4.29M.
Regular FIRE targets $40,000-$80,000 per year β a comfortable middle-class lifestyle requiring roughly $1M-$2M. Fat FIRE targets $100,000+ per year and a $2.5M+ portfolio, funding an upper-middle-class or affluent lifestyle with no spending compromises. Fat FIRE takes longer to reach because the target is larger, but it removes the lifestyle-inflation risk that can pressure leaner plans. Many people pursue Fat FIRE because they want financial independence without downsizing their life.
At a 4% withdrawal rate, $2.5 million funds $100,000/year β the common Fat FIRE threshold. Whether that is 'enough' depends on your city and family size. In a low- or medium-cost area, $2.5M can support a genuinely affluent life. In high-cost metros like San Francisco, New York, or Boston β especially with children and a mortgage β many Fat FIRE planners target $3.5M-$5M to maintain $140K-$200K/year of spending with margin for healthcare and taxes.
At Fat FIRE spending levels, tax efficiency matters more than at lower tiers. Long-term capital gains and qualified dividends are taxed at 0%, 15%, or 20% depending on income; large withdrawals can push you into the 15-20% brackets. The 3.8% Net Investment Income Tax applies once modified AGI exceeds $200,000 (single) or $250,000 (married filing jointly). Asset location β holding bonds in tax-deferred accounts and equities in taxable/Roth β and a planned withdrawal order can meaningfully reduce lifetime tax. This calculator targets a pre-tax spending figure, so budget your effective tax rate into your annual number.
Fat FIRE incomes are usually too high to qualify for ACA premium subsidies, so plan for full, unsubsidized coverage until Medicare at 65. A family can expect roughly $1,500-$2,500/month for a comprehensive ACA marketplace plan, depending on state and age. Options include a high-deductible plan paired with an HSA, short-term COBRA after leaving a job, or building the full premium into your annual spending target. Healthcare is one of the largest line items that separates a realistic Fat FIRE number from an optimistic one.
A 7% real (after-inflation) annual return is a common long-run assumption for a stock-heavy portfolio, based on historical US equity returns. The 4% safe withdrawal rate comes from the Trinity Study and has survived 30-year retirements in over 95% of historical periods. Because Fat FIRE often means retiring early with a 40-50 year horizon, many planners use a more conservative 3.25%-3.5% withdrawal rate, which increases the portfolio needed but lowers the risk of running short.
Fat FIRE Number = Target Annual Spending Γ· Safe Withdrawal Rate. At the standard 4% SWR this equals annual spending Γ 25. Example: $120,000/year Γ· 0.04 = $3,000,000. This Richify calculator combines that target with your current savings, monthly contributions, and expected return to estimate how many years until you reach Fat FIRE and the monthly savings needed to hit it in 3, 5, or 10 years.
Fat FIRE means fully stopping work with a portfolio large enough to fund an affluent lifestyle on its own. Coast FIRE means you have saved enough that compound growth alone will reach your target by retirement age β you still work to cover today's expenses but stop new investing. Barista FIRE means a smaller portfolio supplemented by part-time income. Fat FIRE sits at the top of the spending spectrum and relies on no ongoing earned income at all.