FIRE calculator
How long until your portfolio covers your spending, based on your savings rate and the withdrawal rate you are willing to rely on.
Years to financial independence
16 years
Saving 46% of income towards a 1,875,000 target
- Target portfolio
- $1,875,000
- Savings rate
- 46.43%
- Saved each year
- $65,000
| Income | $140,000 |
|---|---|
| Spending | -$75,000 |
| Saved each year | $65,000 |
| Target at a 4% withdrawal rate | $1,875,000 |
| Years to get there | 16 years |
- The savings rate does the work: spending less both raises what you save and lowers the target it has to reach.
- A 4% withdrawal rate came from a 30-year US study. Longer retirements and lower expected returns argue for 3% to 3.5%.
Spending $75,000 of a $140,000 income is a 46% savings rate and a $1.875m target at 4% — the spending figure sets both sides of the equation.
How this is calculated
How this is calculated
Spending sets the target and the saving
Cutting spending by $5,000 raises annual saving by $5,000 and lowers the target by $125,000 at a 4% withdrawal rate. That double effect is why the savings rate, not the income, dominates the timeline.
target = annual spending ÷ withdrawal rateThe timeline depends on the rate, not the salary
At a 4.4% real return, a 25% savings rate takes about 32 years from zero, 50% takes about 17, and 65% about 11. Two people on very different incomes with the same savings rate arrive at almost the same time.
The 4% rule is a study, not a law
It came from 30-year US retirements. A 45-year horizon at lower expected returns is a different question, which is why many people use 3% to 3.5% — the difference between a $1.875m and a $2.14m target on $75,000 of spending.
Worked example: $140,000 after tax, $75,000 spending, $220,000 invested
| Income | $140,000 |
|---|---|
| Spending | $75,000 |
| Invested | $220,000 |
| Withdrawal rate | 4% |
| Saving | $65,000 a year |
|---|---|
| Savings rate | 46% |
| Target | $1,875,000 |
Dropping the withdrawal rate to 3.5% raises the target to $2,142,857 and adds several years — the single most consequential assumption in the whole calculation.
What this assumes
- A constant real return.
- Income and spending stay level in real terms.
- No tax on investment growth.
- No state pension counted.
Where this commonly goes wrong
- Reaching the number is not the same as being able to spend it — early withdrawal restrictions on retirement accounts often mean the accessible balance is much smaller.
- Spending in the final working years tends to drift up with income, which quietly moves the target away as fast as the portfolio approaches it.
- A 45-year retirement is a different problem from the 30-year one behind the 4% rule, and sequence risk in the first decade is what usually breaks it.
Questions
What is FIRE?
Financial independence, retire early — building a portfolio large enough that a sustainable withdrawal covers your spending. At a 4% rate, $75,000 of spending needs $1.875m; at 3.5% it needs $2.14m.
How long does it take to reach financial independence?
It depends on the savings rate far more than the income. From zero at a 4.4% real return, saving 25% takes about 32 years, 50% about 17, and 65% about 11.
What savings rate do I need?
Whatever gets you there in an acceptable time. A 46% rate — spending $75,000 of $140,000 — is a common shape for a 15-year timeline. Below 20% the maths starts to resemble a conventional retirement date.
Is the 4% rule safe for early retirement?
It was derived for 30-year retirements, not 45-year ones. Many people planning to stop before 50 use 3% to 3.5%, which on $75,000 of spending is a target between $2.14m and $2.5m rather than $1.875m.
Can I access the money before retirement age?
Not always. Retirement accounts usually restrict withdrawals before a set age, so early retirees need a taxable bridge portfolio. Hitting the total without the right split leaves the money technically there and practically unavailable.
Does a higher income guarantee getting there faster?
Only if spending stays flat. Income rises are frequently absorbed by lifestyle, and every $5,000 of extra permanent spending both reduces annual saving and raises the target by $125,000 at a 4% rate.
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This calculator does arithmetic on the figures you enter. It does not account for tax, fees, or your personal circumstances.
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