Seeking Tax Alpha in Retirement Income

On October 24th, 2022, the CFP (Certified Financial Planners) board’s Academic Research Colloquium recognized my most recent research (with A. Simon) entitled “Seeking Tax Alpha in Retirement Income” with a best paper award. I wish to thank Charles Schwab for sponsoring my award. In this post, I will highlight some of the key findings from this paper.

Key Findings

In this paper, we found that the Common Rule provides an important heuristic to guide better decisions in generating tax-efficient retirement income. Using it, we divided retirees into the following three categories that appear in the figure below. Then, we define tax alpha as the additional annual investment return necessary for the Common Rule withdrawal strategy to meet the same portfolio longevity or bequest as an optimal strategy.

Using the Common Rule as a heuristic when seeking tax alpha.  Source:  DiLellio and Simon (2022)
Using the Common Rule as a heuristic when seeking tax efficiency. Source: DiLellio and Simon (2022)

This chart shows that three regions must be considered with separate algorithms to maximize tax efficiency in retirement income. The opportunity for tax efficiency is highest in the middle region, where the retiree and their spouse have sufficient, but not excessive, assets to support their retirement income needs.

Sensitivity Analysis

We also conducted a sensitivity analysis to determine how varying our input values, like asset allocation, may affect outcomes for tax alpha. The chart below shows how the baseline of 0.54% per year changes when inputs are varied.

Sensitivity of Tax Alpha to input variations.  Source: DiLellio and Simon (2022)
Sensitivity of tax alpha to input variations. Source: DiLellio and Simon (2022)

The chart above confirms that higher future taxes and bond interest taxed as ordinary income leads to higher alphas. Also, and somewhat surprisingly, the rate of return of stocks and bonds didn’t change outcomes very much.

What’s your tax alpha?

We invite you to see your tax alpha using our online calculator. Just change the inputs to match your specific situation, hit the “Find Optimal Withdrawals” button at the bottom of the page, then scroll down when the calculations are complete to see your personalized result.

We hope you find this research helpful in planning for your future retirement income needs!

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ETFMathGuy is a subscription-based education service for investors interested in tax-efficient investing with ETFs

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