Fat FIRE Calculator — United States

Fat FIRE targets a retirement with no meaningful lifestyle compromise — travel, private schooling, a comfortable margin. The number is much larger, which makes tax, contribution caps and the split between accessible and locked-away money the dominant factors.

Rules & rates

Australia United States

American rules, 2026 tax year

Your situation

Everything in today's dollars.

Current age35

1870

Retirement age

Filing status

Income & spending

Gross annual income

Take-home after tax: $168,457

Annual spending now

Annual spending in retirement

What you have invested

Taxable brokerage

401(k) + IRA

401(k) contribution

Earliest Fat FIRE age

Age 53

That is 18 years from now, around 2044. From that age the portfolio funds your spending all the way to 95, including the years before 401(k) unlocks.

Target portfolio: $3,500,000
Projected at retirement: $2,959,607
Savings rate: 21%

Save this scenario with Plus. Keep as many scenarios as you like, compare them, track your progress and export the full year-by-year schedule.

General information, not advice

This calculator estimates the earliest age your investments could pay for the retirement spending you enter, and whether they last to the age you plan to. It works only from the figures and assumptions on this page and does not take your objectives, financial situation or needs into account. It is not intended to be relied on for making a decision about a financial product. Consider getting advice from a financial services licensee before making any financial decision.

Why you can retire on less than the 4.0% target

The $3,500,000 target is the simple 4.0% rule — a portfolio big enough to live off indefinitely. Your plan reaches $2,959,607 and still works, because it only has to last to age 95, and it keeps compounding the whole time you are drawing on it. It leaves less margin for a bad run of markets, which the drawdown simulator tests.

Portfolio through to your planning horizon

Shown in today's dollars, so every figure keeps the purchasing power you understand right now.

Brokerage
401(k)
Target to sustain spending

Left at the end: $1,167,267
Money runs out: Never
Year one saving: $39,457

Assumptions and limitations

Every result above rests on these assumptions, and each can be changed in the inputs. Why the defaults are reasonable

Return — Brokerage: 8.0% a year, before fees
Return — 401(k): 8.0% a year, before fees
Fees: 0.05% brokerage · 0.15% 401(k)
Tax drag — Brokerage: 0.40% a year
Inflation: 2.5% a year
Salary growth: 3.5% a year
Withdrawal rate: 4.0%
Plan to age: 95
Tax on withdrawals: 8.0%
Tax and 401(k) rules: 2026 law, indexed to inflation
401(k) unlocks at: Age 59½

Limitations

Returns are the same every year. Real markets rise and fall. A run of poor years early in retirement can use up savings sooner than this shows, even when the average return is the same. The drawdown simulator tests that risk.
Tax and 401(k) rules are 2026 law. Brackets, contribution limits and the standard deduction rise with inflation, as the law provides. Any change to the law will change the result.
Social Security is a flat amount you add. It is the amount you enter, from the age you choose. Your actual benefit depends on your earnings record and the age you claim.
Tax is simplified. Withdrawals are taxed at one flat rate, and capital gains cost bases, Roth accounts, property, businesses, pensions and differences between spouses are not modelled. Your actual tax may be higher or lower.
Small differences compound. Over decades, a 1% difference in returns or fees, or a change in spending, can move the result by years. The “What actually moves your date” panel shows how much each one moves yours.

The bridge: 6.5 years before 401(k) unlocks

Retiring at 53 means funding everything from taxable brokerage until age 59½.

Covered

Needed for the bridge: $910,000
Accessible at retirement: $1,687,740
Surplus: $777,740

The bridge holds

Your accessible investments cover every year before age 59½, so the plan does not depend on reaching 401(k) + ira early.

What actually moves your date

Each row changes one thing and re-runs the whole projection.

Spend $5k less a year
Cuts both what you need and what you must save towards.
-1 yr
Age 52
Earn 10% more
A raise, with the extra going straight to investments.
-2 yr
Age 51
Fees 0.5% lower
Fees on both pools half a percent a year below what you assumed.
No change
Age 53
Returns 1% lower
A more pessimistic market than the one you assumed.
+3 yr
Age 56
Live 5 years longer
A longer horizon the portfolio has to stretch to cover.
No change
Age 53
Retire on 10% more
A more comfortable retirement budget than you planned for.
+1 yr
Age 54

Where your money goes this year

Based on United States rules for the 2026 tax year.

Gross income: $240,000
401(k) contribution: −$12,000
Income tax: −$44,264
FICA: −$15,279
Take-home pay: $168,457
Spending: −$147,000
Into brokerage: $21,457
Employer match: $6,000
Into 401(k): $18,000

Year by year

Retirement years are shaded.

Age	Year	Spending	Brokerage	401(k)	Total
35	2026	$147,000	$366k	$320k	$686k
36	2027	$147,000	$407k	$355k	$761k
37	2028	$147,000	$451k	$392k	$843k
38	2029	$147,000	$499k	$431k	$930k
39	2030	$147,000	$551k	$472k	$1.02m
40	2031	$147,000	$607k	$515k	$1.12m
41	2032	$147,000	$667k	$561k	$1.23m
42	2033	$147,000	$732k	$610k	$1.34m
43	2034	$147,000	$802k	$661k	$1.46m
44	2035	$147,000	$876k	$715k	$1.59m
45	2036	$147,000	$956k	$773k	$1.73m
46	2037	$147,000	$1.04m	$833k	$1.87m
47	2038	$147,000	$1.13m	$897k	$2.03m
48	2039	$147,000	$1.23m	$964k	$2.19m
49	2040	$147,000	$1.33m	$1.03m	$2.37m
50	2041	$147,000	$1.44m	$1.11m	$2.55m
51	2042	$147,000	$1.56m	$1.19m	$2.75m
52	2043	$147,000	$1.69m	$1.27m	$2.96m
53	2044	$140,000	$1.61m	$1.34m	$2.95m
54	2045	$140,000	$1.52m	$1.41m	$2.93m
55	2046	$140,000	$1.43m	$1.48m	$2.92m
56	2047	$140,000	$1.34m	$1.56m	$2.90m
57	2048	$140,000	$1.24m	$1.64m	$2.88m
58	2049	$140,000	$1.14m	$1.73m	$2.87m
59	2050	$140,000	$1.03m	$1.82m	$2.85m
60	2051	$140,000	$1.03m	$1.81m	$2.83m
61	2052	$140,000	$1.02m	$1.80m	$2.81m
62	2053	$140,000	$1.01m	$1.78m	$2.79m
63	2054	$140,000	$998k	$1.77m	$2.77m
64	2055	$140,000	$988k	$1.76m	$2.75m
65	2056	$140,000	$978k	$1.75m	$2.73m
66	2057	$140,000	$968k	$1.73m	$2.70m
67	2058	$140,000	$957k	$1.72m	$2.67m
68	2059	$140,000	$945k	$1.70m	$2.65m
69	2060	$140,000	$933k	$1.69m	$2.62m
70	2061	$140,000	$921k	$1.67m	$2.59m
71	2062	$140,000	$908k	$1.65m	$2.56m
72	2063	$140,000	$895k	$1.63m	$2.52m
73	2064	$140,000	$881k	$1.61m	$2.49m
74	2065	$140,000	$866k	$1.59m	$2.45m
75	2066	$140,000	$851k	$1.56m	$2.41m
76	2067	$140,000	$835k	$1.54m	$2.37m
77	2068	$140,000	$819k	$1.51m	$2.33m
78	2069	$140,000	$802k	$1.49m	$2.29m
79	2070	$140,000	$784k	$1.46m	$2.24m
80	2071	$140,000	$765k	$1.43m	$2.19m
81	2072	$140,000	$746k	$1.39m	$2.14m
82	2073	$140,000	$726k	$1.36m	$2.08m
83	2074	$140,000	$704k	$1.32m	$2.03m
84	2075	$140,000	$682k	$1.29m	$1.97m
85	2076	$140,000	$659k	$1.24m	$1.90m
86	2077	$140,000	$635k	$1.20m	$1.84m
87	2078	$140,000	$610k	$1.16m	$1.77m
88	2079	$140,000	$583k	$1.11m	$1.69m
89	2080	$140,000	$556k	$1.06m	$1.62m
90	2081	$140,000	$527k	$1.01m	$1.54m
91	2082	$140,000	$497k	$954k	$1.45m
92	2083	$140,000	$465k	$896k	$1.36m
93	2084	$140,000	$432k	$834k	$1.27m
94	2085	$140,000	$397k	$770k	$1.17m

Save this scenario with Plus. Keep as many scenarios as you like, compare them, track your progress and export the full year-by-year schedule.

How this works

What does retiring early without cutting back really cost?

Caps become the binding constraint

At Fat FIRE income levels the concessional and elective deferral caps stop you from sheltering most of your savings. The bulk of the work has to be done outside the tax-advantaged system, which changes both your tax bill and how much of your wealth you can actually reach before preservation age.

The bridge gets easier, the target gets harder

Because so much has to sit outside super or a 401(k), high earners rarely fail the bridge test. What they run into instead is the sheer size of the target — and the fact that a percentage point of fees on a very large balance costs a very large amount.

401(k) limits bind early

At Fat FIRE incomes, tax-advantaged accounts hold only a small share of what you save. The 2026 elective deferral limit is $24,500, plus catch-up contributions from 50 (IRS). On the default salary of $240,000, that is about 10.2% of pay; a Fat FIRE savings rate needs several times more.

The rest goes to a taxable brokerage account. That is good for the bridge, because it can be reached at any age, and it means taxes on dividends and gains along the way shape the result more than for a typical saver.

Taxes on a large brokerage account

Qualified dividends and long-term gains are taxed at 0%, 15% or 20% depending on income (IRS), and the 3.8% net investment income tax applies above $200,000 of modified adjusted gross income for a single filer or $250,000 for a couple. Those thresholds are not indexed for inflation.

The calculator models this simply: a tax drag of 0.4% a year on the brokerage account while you work, and one blended rate, 8% by default, on withdrawals in retirement. At Fat FIRE spending, a higher withdrawal rate under Assumptions gives a more conservative projection. Cost bases, tax-loss harvesting and Roth conversions are not modelled.

Health insurance at high incomes

With the enhanced Marketplace credits expired at the end of 2025, and unless Congress restores them, premium tax credits stop at 400% of the federal poverty level (HealthCare.gov). A Fat FIRE retiree's income is often above that, so coverage before Medicare is likely to cost the full premium. Include it in retirement spending.

Flexibility is the Fat FIRE advantage

A Fat FIRE budget carries a lot of spending that could be paused in a bad year: travel, a second home, upgrades. That is a powerful form of insurance. The 4% rule assumes spending never changes; a household willing to trim 10% or 20% after a large market fall can usually sustain a higher starting rate, or the same rate with much less risk.

The drawdown simulator shows what that is worth: run your Fat FIRE portfolio with fixed spending, then with the guardrails rule, and compare the success rates.

The bridge gets easier, the target gets bigger

With most of the money in a brokerage account, high earners rarely fail the bridge test. The challenge is the size of the target: $140,000 a year at a 4% withdrawal rate is about $3.5 million.

At that scale, small percentages are large amounts. Each 0.1% of fees on $3.5 million is $3,500 a year, and the "What actually moves your date" panel shows how many years a fee or return difference is worth on your figures.

Frequently asked questions

How much do I need for Fat FIRE?

At $140,000 a year and a 4% withdrawal rate, about $3.5 million. Your own spending sets the number.

What if I max out my 401(k)?

Deferrals are capped at $24,500 in 2026, more with catch-ups from 50, so the projection puts everything above that in the brokerage account. Some plans allow after-tax contributions beyond the deferral limit; the calculator does not model them.

When do 401(k) catch-up contributions help?

From 50, the deferral limit rises by $8,000, and from 60 to 63 by $11,250 instead (IRS). Employees whose wages were above a threshold in the previous year now have to make catch-up contributions as Roth contributions. The calculator applies the higher limits by age and treats them as pre-tax.

Does the calculator include the net investment income tax?

Not explicitly. It uses a flat tax drag on brokerage returns and a blended rate on withdrawals. Raise either to allow for the 3.8% surtax and higher capital gains rates.

Is Social Security worth including in a Fat FIRE plan?

It is smaller relative to Fat FIRE spending, but a high earner's benefit is among the larger ones even with fewer working years, so it still reduces what the portfolio carries later in life. Add your estimate under Other income & expenses to see the difference.

Sources

Keep going

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