Written By: Philip L. Cooley, Carl M. Hubbard and Daniel T. Walz

This study reports the effects of a range of nominal and inflation-adjusted withdrawal rates applied monthly on the success rates of retirement portfolios of large-cap stocks and corporate bonds for payout periods of 15, 20, 25, and 30 years. A portfolio is deemed a success if it completes the payout period with a terminal value that is greater than zero. Using historical financial market returns, the study suggests that portfolios of at least 75% stock provide 4% to 5% inflation-adjusted withdrawals. Key Words: Retirement planning, Retirement wealth adequacy

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