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Tax-Equivalent Yield Calculator

Convert a tax-exempt municipal bond yield into its taxable-equivalent yield based on your federal and state marginal tax rates.

Frequently Asked Questions

What is taxable-equivalent yield?

It is the pre-tax yield a fully taxable bond would need to match a tax-free municipal bond after taxes. The formula is muni yield divided by one minus your combined marginal tax rate.

When should I include my state rate?

Only when the municipal bond is also exempt from your state income tax, which is usually the case for bonds issued within your own state.

Should I add the NIIT?

Add the 3.8 percent Net Investment Income Tax if it applies to you, since it generally hits taxable bond interest but not qualifying municipal interest, which widens the muni advantage.

Is this investment advice?

No. It is a general estimate and is not investment, tax, or financial advice. Weigh your full situation with a professional.

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Estimates only. Not investment advice.

Investment Disclaimer: Estimates only. Not investment advice.

This calculator provides estimates for educational purposes only and is not investment advice. Past performance does not guarantee future results. Consult with a qualified financial advisor before making investment decisions. All investments carry risk, including potential loss of principal.

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How This Calculator Works

Enter the yield on a tax-free municipal bond and your marginal tax rates. The calculator converts the muni yield into the taxable-equivalent yield, which is the pre-tax yield a fully taxable bond would need to match the muni after taxes. Include your state rate if the bond is also state-tax-free, and add the 3.8% Net Investment Income Tax if it applies to you.

Formula

Taxable-equivalent yield = muni yield ÷ (1 − combined marginal rate), where the combined rate = federal + state (+ 3.8% NIIT if selected).

Worked Example

A 3.5% muni, 24% federal rate, no state tax. TEY = 3.5% ÷ (1 − 0.24) = 3.5% ÷ 0.76 ≈ 4.61%. A taxable bond would need to yield about 4.61% to match the muni after tax.

State and Local Tax Layer

The basic TEY formula uses only the federal rate, but for residents of high-income-tax states the state tax layer can dramatically increase the taxable-equivalent yield. California's top marginal rate is 13.3%, New York's reaches 10.9%, and New Jersey's 10.75%. Adding these rates to the federal 37% bracket plus 3.8% NIIT produces a combined rate above 61%, which means a 3.5% muni yields a TEY above 9% for such investors.

Most municipal bonds are federally tax-exempt. For state tax exemption, the bond must typically be issued within your state of residence. A California resident buying a New York muni pays federal taxes on neither, but owes California state income tax on the New York muni's interest. Only in-state munis qualify for both layers of exemption. In New York City, residents can achieve triple tax exemption on NYC-issued munis: federal, New York State, and New York City income tax are all avoided. Always confirm the exemption status of a specific bond in its official statement before assuming state exemption.

AMT and Muni Bond Exceptions

Not all municipal bonds are fully free of federal tax exposure. Private activity bonds are a category of munis issued to finance projects that primarily benefit private entities: airports, sports stadiums, certain affordable housing projects, and some industrial development. The interest on these bonds is technically exempt from regular federal income tax but is treated as a preference item under the Alternative Minimum Tax (AMT). Investors subject to AMT must include this interest when calculating their AMT liability.

The Tax Cuts and Jobs Act of 2017 reduced the AMT's reach for most individual taxpayers, but high earners with substantial preference items can still be affected. If you are exposed to AMT, you should reduce the effective yield of a private activity bond accordingly before comparing it to non-AMT munis or taxable alternatives. The bond's official statement will disclose whether it is a private activity bond subject to AMT. Investment research platforms and broker bond screens typically flag AMT-subject munis.

Building a Tax-Aware Fixed Income Portfolio

The fundamental principle of tax-aware fixed income allocation is to place each asset in the account type where its tax treatment is most favorable. Taxable bonds (Treasuries, investment-grade and high-yield corporates) generate ordinary income taxed at your top marginal rate each year. Holding them inside a tax-deferred account such as a traditional IRA or 401(k) allows the interest to compound without annual tax drag, and the eventual withdrawal is taxed as ordinary income at your retirement rate, which may be lower.

Municipal bonds should generally be held in taxable brokerage accounts. Their federal tax exemption is wasted inside a traditional IRA because all IRA withdrawals are taxed as ordinary income regardless of the source of the underlying earnings. In a taxable account, the muni's exemption works fully in your favor every year.

I-bonds are a hybrid: interest is subject to federal income tax but exempt from state and local tax, and the tax is deferred until redemption. This deferred taxation makes them behave somewhat like a Roth account for federal purposes during the holding period. Redeeming I-bonds in a low-income year (after retirement, between jobs, etc.) can minimize the tax owed.

Treasury bonds and notes are exempt from state and local income tax, improving their after-tax yield for residents of high-tax states. In California, a Treasury yielding 5% has a state-tax-equivalent yield of roughly 5.7% compared to a California muni with no state exemption, which could affect the relative attractiveness between federal-exempt munis and Treasuries depending on each bond's yield.

Common Mistakes

Adding the state rate when the bond is not exempt from your state tax.
Using your average tax rate instead of your top marginal rate.
Forgetting the NIIT, which can apply to taxable bond interest but not to qualifying muni interest.
Treating this as a recommendation; it is a general estimate, not investment or tax advice.

Tips & FAQ

When do munis make sense? Generally when your taxable-equivalent yield exceeds the yield available on comparable taxable bonds, which favors higher tax brackets.

Are municipal bonds always better for high earners? Not automatically. The key comparison is the TEY vs. the yield on a comparable taxable bond of similar credit quality and maturity. If a five-year Treasury yields 5.0% and the TEY on a five-year AA muni is 4.8%, the Treasury is better even at a high tax rate. Also consider that munis carry credit risk (apart from general obligation bonds of financially strong states) while Treasuries do not. Run the TEY calculation first, then compare to current taxable yields before deciding.

What if I'm in the 0% federal bracket? If your taxable income falls below the threshold for the 10% federal bracket (for example, a retiree drawing mostly from a Roth IRA), your federal marginal rate on ordinary income may be zero or 10%. At that rate, a taxable bond paying 5% handily beats a muni paying 3.5%. Municipal bonds provide little or no advantage for investors in low tax brackets. The crossover point is roughly the 22–24% federal bracket; above that, munis in a taxable account typically become competitive.

Is this advice? No. It is a general estimate and is not investment, tax, or financial advice. Consider your full situation with a professional.