Taxable Equivalent Yield: How to Compare Municipal Bonds to Taxable Investments

If you are comparing a tax-free municipal bond yielding 3.5% to a corporate bond yielding 5%, which one actually puts more money in your pocket? The answer depends on your tax bracket, and the tool for figuring it out is the taxable equivalent yield calculation. For a broader overview of tax-exempt investment vehicles (Roth accounts, HSAs, and more), see our tax-free investments guide. This guide walks through the math, shows when municipal bonds make sense, and covers common pitfalls.

Key Takeaways

• Taxable equivalent yield (TEY) converts a tax-free muni yield into the taxable yield you would need to earn the same after-tax income.
• The formula is: TEY = Tax-Free Yield / (1 - Marginal Tax Rate).
• Higher-bracket taxpayers get the biggest benefit from municipal bonds.
• State tax savings can add further value if you buy in-state munis.

The Taxable Equivalent Yield Formula

The core formula is straightforward:

Taxable Equivalent Yield = Municipal Bond Yield / (1 - Marginal Tax Rate)

For example, a muni yielding 3.50% for someone in the 24% federal bracket:

TEY = 3.50% / (1 - 0.24) = 3.50% / 0.76 = 4.61%

That means a taxable bond would need to yield at least 4.61% to match the muni’s after-tax income.

Including State Taxes

If the muni is also exempt from state income tax (typically in-state bonds), include your state rate:

Combined TEY = Muni Yield / (1 - Federal Rate - State Rate + (Federal Rate x State Rate))

The last term avoids double-counting since state taxes are computed on the same base.

TEY by Federal Tax Bracket

Here is what a 3.50% tax-free muni yield is worth in taxable terms across different federal brackets (federal tax only):

The pattern is clear: the higher your bracket, the more valuable the tax exemption becomes. To understand how your marginal rate differs from your effective rate, see our marginal vs. effective tax rates guide.

When State Taxes Are Included

For a filer in the 32% federal bracket living in California (top state rate ~13.3%), an in-state muni yielding 3.50% has a combined TEY of approximately:

TEY = 3.50% / (1 - 0.32 - 0.133 + (0.32 x 0.133)) = 3.50% / (1 - 0.32 - 0.133 + 0.0426) = 3.50% / 0.5896 = 5.94%

A taxable bond would need to yield almost 6% to compete. This is why municipal bonds are especially popular in high-tax states.

Net Investment Income Tax (NIIT) Consideration

Taxpayers subject to the 3.8% Net Investment Income Tax get an extra benefit from munis. Municipal bond interest is excluded from net investment income, so the effective tax advantage may be even larger than the bracket calculation suggests.

For a 37% bracket filer also paying NIIT:

TEY = 3.50% / (1 - 0.37 - 0.038) = 3.50% / 0.592 = 5.91%

Types of Municipal Bonds

General Obligation (GO) Bonds

Backed by the full taxing power of the issuing municipality. Generally considered safer but may offer lower yields.

Revenue Bonds

Backed by revenue from a specific project (toll road, hospital, water system). Slightly higher risk, often higher yields.

Private Activity Bonds

Fund projects with private involvement (airports, housing). Interest may be subject to AMT for some filers — check before buying if you are AMT-sensitive. See our AMT guide.

When Municipal Bonds Make Sense

Municipal bonds tend to be a strong fit when:

• You are in the 24% federal bracket or higher — the tax exemption becomes meaningful. Check our tax brackets guide to confirm your bracket.
• You live in a high-tax state — in-state munis avoid both federal and state tax. See the SALT deduction cap guide for how state taxes interact with your federal return.
• You have a taxable brokerage account — the tax benefit only applies in taxable accounts
• You want lower volatility — munis tend to be less volatile than stocks
• You are subject to NIIT — munis are excluded from the 3.8% surtax

When Munis May Not Be the Best Choice

• Low tax brackets — the tax exemption is not worth the typically lower yield
• Retirement accounts — tax-deferred accounts already shelter income; holding munis wastes the exemption
• Need for liquidity — individual muni bonds can be illiquid in secondary markets
• Credit risk concerns — unlike Treasury bonds, munis carry default risk (though it is historically low)

For a broader look at how different investments are taxed — including dividends, capital gains, and interest — see our taxes on investments guide and capital gains tax rates guide.

Asset Location: Where to Hold Munis

Asset location matters more than most investors realize. The general rule:

Muni Bond Funds vs. Individual Bonds

You can access municipal bonds through:

• Individual bonds — you choose maturity, credit quality, and state. Good for building a bond ladder. Requires more capital (typically $5,000+ per bond).
• Muni bond mutual funds — diversified, professionally managed, lower minimum investment. Interest is still tax-exempt but capital gains distributions are taxable.
• Muni bond ETFs — similar to mutual funds but traded on exchanges. Popular options include broad national muni ETFs and state-specific ETFs.

A Worked Example: Should You Buy the Muni?

Scenario: You are a single filer with $100,000 in taxable income (2025), putting you in the 24% federal bracket. You live in New York (state rate ~6.85%). You are choosing between:

• An in-state NY muni bond yielding 3.40%
• A corporate bond yielding 5.10%

Step 1: Calculate combined TEY

TEY = 3.40% / (1 - 0.24 - 0.0685 + (0.24 x 0.0685)) TEY = 3.40% / (1 - 0.24 - 0.0685 + 0.01644) TEY = 3.40% / 0.70794 TEY = 4.80%

Step 2: Compare

The muni’s taxable equivalent yield of 4.80% is less than the corporate bond’s 5.10%. In this case, the corporate bond wins on yield — but you would also want to compare credit quality, duration, and liquidity.

Step 3: Consider NIIT

If your income is above $200,000 (single), add the 3.8% NIIT to the calculation. That would push the TEY to approximately 5.40%, making the muni the better choice.

How sharper.tax Helps

When you upload your tax return to sharper.tax, our platform calculates your marginal federal and state tax rates based on your actual income. This means you can quickly determine whether tax-exempt investments are worth the typically lower nominal yield in your specific situation. We surface tax-efficient strategies tailored to your bracket, not generic rules of thumb.

Sources

• IRS Tax-Exempt Interest (Publication 550)
• MSRB: Municipal Securities Basics
• SEC Investor Bulletin: Municipal Bonds
• IRS: Net Investment Income Tax

---

The information above is educational and not tax advice.