The 4% Rule Is Dead — Here's What's Replacing It
Modern retirees need a dynamic withdrawal plan, not a fixed number. The new guardrail approach explained.
The original 4% rule
Bill Bengen's 1994 research found that withdrawing 4% of a portfolio in year one, adjusted for inflation each year after, survived every 30-year period in U.S. market history.
Why it's under pressure today
- Bond yields lower than historical averages.
- Equity valuations higher than historical averages.
- Longer retirements (30–40 years instead of 30).
Updated research suggests safe initial withdrawal rates of 3.3–4.2% depending on assumptions.
The guardrails approach
Instead of a fixed inflation-adjusted withdrawal, use Guyton-Klinger guardrails:
- Set starting withdrawal at 5%.
- If portfolio drops so withdrawal rate exceeds 6%, cut spending 10%.
- If portfolio grows so withdrawal rate falls under 4%, raise spending 10%.
This dynamic approach historically supports higher average spending than fixed 4%.
The bucket strategy companion
Pair withdrawals with three time-segmented buckets:
- 1–2 years of cash for current spending.
- 3–7 years of bonds for the next phase.
- 8+ years of stocks for long-term growth.
In bad markets, draw from cash; refill from bonds; let stocks recover.
Bottom line
A modern retirement plan is dynamic spending + bucketed assets, not a single percentage. Most retirees can spend more in good years and less in bad years and still be fine for 35+ years.