Safe Withdrawal Rate UK: Why the 4% Rule Falls Short

The 4% rule was built on US data in 1994. Pfau's Monte Carlos say today's UK retiree should use a smaller number. On a £500k pot, the gap is a holiday a year, forever.

Annual income from a £500,000 pot by withdrawal rate

4.0% (Bengen 1994)£20,000

3.5% (Pfau modern)£17,500

3.3% (40-year FIRE)£16,500

3.0% (very conservative)£15,000

Year-one withdrawal on a £500k portfolio. Pfau argues today's UK retirees should use the smaller numbers.

Key takeaways

Pfau argues that the 4% rule may not be safe due to lower expected bond returns and longer retirement periods.

Sequence of returns risk means poor market performance early in retirement can severely impact long-term financial security.

UK retirees can mitigate this risk by delaying withdrawals from personal savings until the State Pension provides income.

Dynamic withdrawal strategies, like setting guardrails, allow retirees to adjust their spending based on market conditions.