The 4% Rule Explained — Does It Still Work?

Where the 4% Rule Comes From

The 4% rule originated from the Trinity Study (1998), conducted by three finance professors at Trinity University. They analyzed historical stock and bond returns from 1926 to 1995 and determined that a portfolio of 50% stocks and 50% bonds could sustain a 4% annual withdrawal rate, adjusted for inflation, over a 30-year retirement with a high probability of success.

How It Works

In year one, you withdraw 4% of your portfolio. Each subsequent year, you adjust that dollar amount for inflation — regardless of market performance. If the market drops, you still take the inflation-adjusted amount, which may be more than 4% of the current balance.

This is the key insight of the Trinity Study: the 4% rule survived the worst historical periods, including the Great Depression and the 1970s stagflation.

Criticisms and Modern Adjustments

Critics argue that future returns may be lower, bond yields are lower than historical averages, and many early retirees need their money to last 40-60 years — not 30. For these reasons, many in the FIRE community now recommend more conservative withdrawal rates.

The Bottom Line

The 4% rule is not a law — it is a guideline. It gives you a starting point for estimating your FIRE number. The right withdrawal rate depends on your risk tolerance, retirement length, and asset allocation. Use our calculator to model different rates and find the number that works for you.