Safe withdrawal rate: 3% vs 3.5% vs 4%
How to choose a starting withdrawal rate for FIRE planning — and why early retirees often stress-test below 4%.
A safe withdrawal rate (SWR) is the percentage of your portfolio you plan to spend in year one of retirement, typically adjusted for inflation afterward. Combined with annual spending, it sets your FIRE number: spending ÷ withdrawal rate.
Where 4% comes from
The classic 4% starting point is associated with William Bengen’s research and the Trinity Study lineage on historical U.S. stock/bond portfolios. It is a research-based rule of thumb for multi-decade retirements — not a guarantee that markets will behave the same way for the next 30–50 years.
Why early retirees often use 3–3.5%
- Longer horizon: retiring at 40 can mean 50+ years of withdrawals.
- Sequence-of-returns risk: poor markets early in retirement hurt more when the plan is longer.
- Flexibility trade-offs: lower SWR means a larger nest egg, but more buffer if returns disappoint.
A simple comparison at $60,000 spending
- 4.0% → FIRE number $1,500,000 (25×)
- 3.5% → FIRE number about $1,714,000 (~28.6×)
- 3.0% → FIRE number $2,000,000 (~33.3×)
That is a $500,000 spread between 4% and 3% for the same lifestyle. The “right” rate depends on your flexibility to cut spending, other income (Social Security, part-time work), asset allocation, and risk tolerance — none of which a single percentage captures perfectly.
How to use SWR in RetireFire
Treat SWR as a dial, not a destiny. Run your FIRE number at 3%, 3.5%, and 4%. If only the optimistic case works, the plan is fragile. Pair the number with the years-to-FIRE and Coast/Barista tools to see whether work income or a longer accumulation period closes the gap.
Educational illustration only — not financial advice. See the Methodology page for formula notes and the disclaimer before making decisions.