4% rule calculator and safe withdrawal rates
The **4% rule** (often traced to the Trinity study) suggests withdrawing about 4% of the starting portfolio in year one of retirement, then adjusting for inflation, with a high chance of lasting 30 years in US historical data.
When the 4% rule breaks down
- **Long retirements** (40–50 years for FIRE) may need a lower initial rate.
- **Sequence risk** — bad returns early in retirement hurt more than late.
- **Low bond yields or high valuations** led many planners to use 3–3.5% for new retirees.
- **Taxes and fees** reduce spendable cash flow.
Using a 4% rule calculator responsibly
Multiply portfolio value by your chosen rate (3%, 3.5%, 4%) for a rough annual spend. Then stress-test with Monte Carlo — does your plan survive bear markets?
Quala's free retirement calculator models growth and decumulation with volatility, not a single average return.
Dynamic spending alternatives
Guardrails (cut spending after bad years), floor/ceiling strategies, and partial annuities can raise sustainable spend in some regimes — at the cost of complexity.