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What Is Tax-Equivalent Yield?


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    Highlights

  • The tax-equivalent yield is the return a taxable bond needs to match a tax-exempt bond's yield after taxes
  • Investors should factor in their marginal tax rate to compare bond options effectively
  • Municipal bonds are often tax-exempt at the federal level, but state taxes may apply
  • The formula for tax-equivalent yield can be reversed to find equivalent tax-free yields
Table of Contents

What Is Tax-Equivalent Yield?

Let me explain what tax-equivalent yield means to you as an investor. It's the return a taxable bond would need to provide to equal the yield on a comparable tax-exempt municipal bond. You use this calculation to compare returns between a tax-free investment and a taxable one, and remember, its value depends on your individual tax bracket.

Key Takeaways

Here's what you need to know: the tax-equivalent yield is the return a taxable bond requires to match a comparable tax-exempt bond like a municipal one. You compare returns between tax-free and taxable alternatives this way. And again, the value to you hinges on your tax bracket.

Tax-Equivalent Yield Formula

The tax-equivalent yield is what you'd need to earn on a taxable bond to match a tax-free investment's return. Depending on your tax bracket, a tax-free option like a municipal bond might not always be the best for your portfolio. Your tax bracket comes from your filing status and income, with federal rates for 2024 and 2025 at 10%, 12%, 22%, 24%, 32%, 35%, and 37%. To calculate it for a tax-free municipal bond, use this formula: Return (TEY) = Return (TX) / (1 - t), where Return (TEY) is the fully taxable equivalent yield, Return (TX) is the tax-exempt return, and t is your marginal tax rate. You can reverse this to find the tax-free yield matching a taxable bond.

Tip on Including State Taxes

When you calculate the return, include any state taxes along with your federal rate.

Tax Rate Implications

Your tax bracket and rate directly impact the tax-equivalent yield. Take a tax-free bond yielding 7%, for example. Whether you choose this or a taxable option depends on your marginal bracket. For 2024, the calculations are: in the 10% bracket, it's 7% / (1 - 10%) = 7.78%; 12% is 7.95%; 22% is 8.97%; 24% is 9.21%; 32% is 10.29%; 35% is 10.77%; and 37% is 11.11%. If a taxable bond yields 9.75%, you'd be better off with it in the first four brackets, as it beats the 7% after taxes. In the top three, go for the tax-free bond.

Important Note on Taxable Municipal Bonds

Taxable municipal bonds are uncommon but can appear for projects like sports stadiums or pension shortfalls.

Examples

Suppose you're in the 22% federal bracket with no state taxes, holding a tax-exempt municipal bond at 8% coupon. The taxable equivalent is 0.08 / (1 - 0.22) = 10.26%. A taxable bond needs to yield 10.26% to match after taxes. If your rate is 37%, it jumps to 0.08 / (1 - 0.37) = 12.70%.

Why Are Municipal Bonds Exempt From Federal Taxation?

Interest on state and local bonds has been tax-exempt since the federal income tax started in 1913. Many believed the Constitution barred federal taxing of this income. Today, it's justified because local projects serve the public good, so federal policy supports them.

Are Municipal Bonds Subject to State Tax?

Municipal bonds offer a tax-free edge hard to beat, but watch for extras. They're free from federal taxes, but some states tax the earnings.

When Are Capital Gains Taxes Applied to Tax-Free Investments?

The IRS might tax municipal interest if you buy the bond at a big discount to par. A mutual fund of tax-free bonds faces capital gains tax.

The Bottom Line

In summary, tax-equivalent yield is what a taxable bond must return to equal a tax-exempt one like a municipal bond. Bond coupon payments are taxed based on type and issuer. U.S. Treasury bonds skip state and local taxes, and municipal bonds avoid regular federal income tax.

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