Taxes and account rules
Estimate how income tax, capital gains tax, retirement account access, and contribution limits affect spendable cash.
FIRE basics4% rule
4% rule
4% Rule for FIRE Planning in United States
Understand the 4% rule, why it is used in FIRE planning, when it may be too aggressive, and how to stress-test withdrawals for United States.
Regional assumptions to review in United States
A FIRE number is only useful when the local assumptions behind it are realistic. Use this checklist to adapt the calculator to United States before relying on the result.
Public pension and safety net
Decide whether social security, public pension, or other benefits are a backup, a delayed income source, or excluded from the base case.
Health insurance and care costs
Model insurance premiums, out-of-pocket medical costs, and long-term care separately, especially for early retirement years.
Housing and home equity
Treat a primary home differently from investable assets unless it can be sold, rented, downsized, or borrowed against.
Inflation, currency, and relocation
Check whether spending, income, and investments are exposed to different inflation rates or currencies.
Use local facts, not generic defaults
ChooseFIRE can structure the calculation, but it cannot know your tax filing status, benefits, insurance plan, family obligations, or local policy changes. Revisit the assumptions whenever your region, currency, or residency plan changes.
Short answer
The 4% rule is a retirement withdrawal heuristic: withdraw about 4% of the portfolio in the first year, then adjust spending for inflation. It is useful for estimating a FIRE target, but it is not a promise.
4% rule formula
Target portfolio = annual expenses ÷ 4%
Because 1 ÷ 4% equals 25, the 4% rule turns annual expenses into an approximate 25x portfolio target.
Example
With annual expenses of 60,000, a 4% rule estimate points to a 1,500,000 portfolio. A 3.5% stress test would raise the target to about 1,714,286.
How to use it responsibly
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Use it as a starting point
The rule is helpful for a first estimate, but it should not be the only retirement test.
- 2
Stress-test lower rates
Compare 4%, 3.5%, and 3% to see how sensitive the plan is to market sequence risk and long time horizons.
- 3
Add real-world costs
Taxes, fees, health care, housing, and family support can make spendable cash lower than the simple formula suggests.
4% rule FAQ
Is the 4% rule safe for early retirement?
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It may be too aggressive for very long retirements. Many FIRE plans compare 4% with lower withdrawal rates before deciding.
Does the 4% rule include inflation?
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The common version assumes the first withdrawal is 4% of the portfolio and later withdrawals adjust for inflation.
Can I use a higher withdrawal rate?
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Higher rates reduce the target but increase failure risk unless spending is flexible, income continues, or the portfolio is more resilient.
Planning note
The 4% rule comes from historical research and simplified assumptions. It should be paired with tax planning, asset allocation, and periodic recalculation.
Continue planning
Open the FIRE calculator
Enter assets, expenses, savings, and assumptions to estimate your target portfolio and timeline.
Learn FIRE concepts
Understand the 4% rule, Lean FIRE, Fat FIRE, and the limits of the model.
Review asset allocation
Compare your current asset mix with the return assumption in your FIRE plan.
Step 1: Set annual expenses
Model the lifestyle you want to sustain, not only your current minimum budget.