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Income Insights: Understanding Tax-Equivalent Yield

Income Insights is a series designed to quickly describe important income tax concepts for advisors and their clients.

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12/2/2024


Topic

Tax Management

Understanding Tax-Equivalent Yield

When comparing bonds, be sure to evaluate yields on a tax-equivalent basis to consider the impact of taxes on after-tax returns. Here we look at the tax-equivalent yield using a hypothetical scenario.

These married taxpayers—who file jointly—reside in Arizona and earn a combined $450,000 per year. Their federal marginal tax rate is 32%, and they’re subject to the Net Investment Income surtax of 3.8%. They also pay a state tax of 2.5%, with a combined federal and state marginal tax rate of 38.3%. For this example, we assume an in-state municipal bond yield of 3.28%. 

The formula for calculating tax-equivalent yield is:

tax-free bond yield ÷ (1 − marginal tax rate)

Below is how the tax-equivalent yield would be calculated for our hypothetical couple, comparing four types of bonds.

The table compares tax-equivalent yields of four types of bonds for the couple in this hypothetical example. Given their tax situation, in-state municipal bonds had the lowest tax-equivalent yield at 3.28%. Out-of-state municipal bonds were next at 3.36%, and then U.S. Treasury bonds at 5.11%. Corporate bonds had the highest tax-equivalent yield in this example at 5.32%.

For this couple, a corporate bond must yield 5.32% to produce an after-tax yield equivalent to the in-state municipal bond yielding 3.28%. This hypothetical example highlights how taxes can affect investment returns and the importance of making informed decisions to maximize after-tax income.

Allspring Global Investments does not provide accounting, legal, or tax advice or investment recommendations.