By Harry Prabandham · Updated September 28, 2026
Investing & Markets
Tax-Exempt vs. Taxable Bonds: How to Compare After-Tax Yields
To compare a muni with a taxable bond, gross up its yield by your marginal federal and state rate. State tax, AMT, and credit quality also matter.
Tax-Exempt vs. Taxable Bonds: How to Compare After-Tax Yields
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How do you compare tax-exempt and taxable bond yields?
- Taxable-equivalent yield equals the tax-exempt yield divided by one minus your marginal tax rate.
- The rate to use is the one on your next dollar of interest, including state tax and the 3.8% net investment income tax where it applies.
- Compare bonds with similar maturity, credit quality, and call features, or the comparison mixes different risks.
- The higher the marginal rate, the more the federal exemption is worth.
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Full Guide
How do you compare tax-exempt and taxable bond yields?
- Taxable-equivalent yield equals the tax-exempt yield divided by one minus your marginal tax rate.
- The rate to use is the one on your next dollar of interest, including state tax and the 3.8% net investment income tax where it applies.
- Compare bonds with similar maturity, credit quality, and call features, or the comparison mixes different risks.
- The higher the marginal rate, the more the federal exemption is worth.
Which tax rates matter in 2026?
- Federal ordinary rates run from 10% to 37%; in 2026 the 37% rate starts above $640,600 of taxable income for single filers and $768,700 for joint filers.
- The 32% bracket starts at $201,775 single and $403,550 joint in 2026.
- The 3.8% net investment income tax applies to taxable interest above $200,000 of modified AGI single or $250,000 joint; tax-exempt interest isn't subject to it.
- California's top rate is 12.3%, plus a 1% surcharge on taxable income over $1 million.
How does state tax change the math?
- Most states exempt interest on their own municipal bonds and tax interest on other states' bonds; California follows this pattern.
- Interest on U.S. Treasuries is exempt from state and local income tax by federal law, which narrows the muni advantage over Treasuries in high-tax states.
- Corporate bond interest is generally taxable at both the federal and state level.
- Residents of states without an income tax gain little extra from buying in-state munis.
What other tax interactions apply to munis?
- Interest on certain private activity bonds is an AMT preference item, so it can be taxed for people subject to the alternative minimum tax.
- Tax-exempt interest counts in the income used to figure how much of your Social Security benefit is taxable.
- It is also included in the modified AGI Medicare uses to set IRMAA premium surcharges.
- Gains from selling a muni, or from buying it at a market discount, can be taxable even though the interest isn't.
What risks do municipal bonds carry?
- Credit risk varies by issuer, from general obligation bonds backed by taxing power to revenue bonds backed by a single project.
- Longer maturities carry more interest rate risk, and callable bonds may be redeemed early when rates fall.
- Individual munis can trade infrequently with sizable dealer markups; the MSRB's EMMA website shows trade prices.
- Future tax law changes could alter the value of the exemption.
Where are munis and taxable bonds usually held?
- Munis generally belong in taxable accounts; inside an IRA or 401(k) the exemption is wasted because withdrawals are taxed as ordinary income anyway.
- Taxable bonds are often placed in tax-deferred accounts, where interest isn't taxed each year.
- The right placement depends on account sizes and the overall allocation, not just each bond's yield.
- A CPA can confirm your marginal rates, including AMT and state exposure, before you run the comparison.
Key takeaways
- Compare bonds on after-tax yield, using your true marginal federal and state rate.
- Munis are usually most valuable in high federal and state brackets and in taxable accounts.
- Treasuries' state tax exemption, AMT exposure, and IRMAA effects can shift the answer.
- Match maturity and credit quality so the comparison measures tax, not extra risk.
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Sources
- 26 U.S.C. § 103 — Interest on state and local bonds
- 26 U.S.C. § 57 — Items of tax preference (private activity bonds)
- IRS — Rev. Proc. 2025-32 (2026 inflation-adjusted brackets)
- IRS — Questions and Answers on the Net Investment Income Tax
- 31 U.S.C. § 3124 — Exemption from state taxation of U.S. obligations