How Much Do You Need to Retire Early? A Practical FIRE Number
Estimate a FIRE target from annual spending, then test how long your current savings plan may take to reach it.
The numbers to take away
- At a 4% withdrawal rate, the starting target is roughly 25 times annual spending.
- A 3% rate raises the target to about 33.3 times spending.
- The useful question is not only “how much?” but also “how long at my current contribution?”
Start with spending, not salary
All monetary figures in this guide are U.S. dollars (USD). Financial independence means that invested assets can support spending without depending on a paycheck. That is why annual spending—not current salary—is the cleaner starting point.
If a household spends US$40,000 a year, a simple 4% rule estimate is US$1,000,000. At 3%, the same spending implies about US$1.33 million. That gap is the price of a more conservative withdrawal assumption.
A realistic employee scenario
Suppose a 35-year-old starts with US$20,000 and invests US$700 each month. At a constant 6% annual return, the projected balance is about US$252,655 after 15 years and US$574,395 after 25 years.
These are planning illustrations, not market forecasts. Fees, taxes, inflation and uneven returns can all shift the date.
- Base case: 5–6% nominal return
- Conservative case: lower return and higher future spending
- Stress case: a career break or reduced contributions
Make the target personal
Build annual spending from housing, food, transport, insurance, healthcare, taxes and discretionary spending. Then add irregular costs rather than pretending they do not exist.
Revisit the target every year. A FIRE number is a moving planning range, not a permanent promise.
Common questions
Is the 4% rule safe everywhere?
No. It came from historical portfolio research and may not fit every market, tax system, retirement length or asset mix.
Should I subtract pensions?
You can model reliable future income separately, but timing and eligibility matter. Avoid treating uncertain income as guaranteed.