The Money Vault – Alternative to the 4% rule

Listen to The Money Vault - Alternative to the 4% rule

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Summary:

I revisit the traditional 4% rule, developed by Bill Bengen, originally designed to provide sustainable retirement income over a 30-year period. While popular, I explain how this rule can struggle during market downturns, such as the 20% market drop seen during the pandemic. If your portfolio falls but you continue to withdraw a fixed, inflation-linked amount, you risk depleting your funds too quickly.

I then introduce a practical alternative: the dynamic spending method. Using recent research from Vanguard, I explain how this strategy adjusts your annual income based on market performance but uses a calculated "ceiling" and "floor" to prevent wild fluctuations in your spending power. Finally, we look at the data to see how this method compares to the 4% rule regarding long-term success rates, and I reveal a free tool you can use to calculate these numbers for your own pension pot.

Key insights

• The 4% rule has limitations - The traditional method of taking 4% in year one and adjusting for inflation assumes a 50% equity and 50% bond split. However, previous analysis shows a truly safe withdrawal rate for a 90% success rate is much lower, closer to 1.8%.
• Beware sequence of returns risk - Taking fixed withdrawals during a market crash means you are selling a larger percentage of your investments when they are low in value, which can permanently damage your portfolio's ability to recover.
• Dynamic spending offers a middle ground - By setting a maximum withdrawal limit 'ceiling' (e.g., +5%) and a minimum withdrawal limit 'floor' (e.g., -1.5%), you can benefit from good market years without suffering drastic income cuts during bad years.
• Higher starting income and better success rates - Vanguard's research shows that dynamic spending can often allow for a higher initial withdrawal amount and significantly increases the probability of your money lasting 30 years compared to the rigid 4% rule.
• Alternative strategies exist - If drawing down capital feels too risky, another valid strategy is to live purely off the natural yield (dividends and interest) of your investments, preserving the underlying capital.

• Sign up to our weekly newsletter
• Take out a trial of 80 20 investor
• Vanguard White Paper on Dynamic Spending
• fiCalc.app - Retirement withdrawal calculator
• MTTM Podcast Episode 210 - Debunking the 4% rule
• Watch on YouTube - Alternative to the 4% rule