Tax-Exempt Interest Income: What It Is, How It Works, Examples

Tax-exempt interest income is earned primarily from municipal bonds and other qualifying investments that are exempt from federal, and sometimes state, income taxes. By holding these investments, taxpayers can reduce their taxable income while still earning passive returns. However, tax-exempt interest income may still be subject to other tax considerations, such as the alternative minimum tax (AMT) or state-level taxation, depending on where the investor resides.

Working with a financial advisor can help you determine if tax-exempt interest income aligns with your financial goals and overall tax strategy.

What Is Tax-Exempt Interest Income?

Tax-exempt interest income refers to interest earned on certain types of investments that are not subject to federal income tax. This income is typically generated from municipal bonds, which are debt securities issued by state and local governments or other qualifying issuers to fund public projects such as infrastructure, schools and transportation.

In some cases, state and local taxes may be waived, but this depends on the investor’s residency. Typically, if an investor holds municipal bonds issued within their home state, they will also be exempt from state and local taxation. However, interest earned on out-of-state municipal bonds may still be subject to home state income tax.

Unlike taxable interest from savings accounts, corporate bonds or Treasury securities, tax-exempt interest income does not increase a taxpayer’s federal taxable income. However, it does still need to be reported on a tax return. While it generally does not affect a taxpayer’s regular federal income tax bill, it can play a role in other financial considerations, such as determining eligibility for certain tax credits, calculating Social Security taxation or triggering AMT liabilities.

How Tax-Exempt Interest Income Works

Tax-exempt interest income is generated when an investor holds bonds or other qualifying debt instruments issued by governments or certain nonprofit entities. The issuing entity agrees to pay periodic interest to bondholders, and if the investment qualifies as tax-exempt, the interest payments are not subject to federal income tax.

Even though tax-exempt interest income does not contribute to an investor’s federal taxable income, it must still be reported on IRS Form 1040. This income is listed on a separate line and is used for informational purposes.

Additionally, while it is exempt from regular income tax, tax-exempt interest may still impact other tax calculations, such as:

The taxation of Social Security benefits, since tax-exempt interest is included when determining whether part of those benefits is taxable.
The alternative minimum tax, as certain private activity bonds, while exempt from regular income tax, can be subject to AMT rules.
Income-based phaseouts for deductions and credits, since some tax benefits consider tax-exempt interest in their eligibility calculations.

Tax-exempt interest reported by a payer generally appears in box 8 of Form 1099-INT. Taxpayers report their total tax-exempt interest on line 2a of Form 1040 or Form 1040-SR. Exempt-interest dividends from a mutual fund or another regulated investment company are also included on that line.

Examples of Tax-Exempt Interest Income

Several types of investments generate tax-exempt interest income. While municipal bonds are the most common, other types of securities can also provide tax advantages. Here are four examples to consider.

Municipal Bonds

Municipal bonds, or “munis,” are issued by state and local governments to finance public projects. These bonds typically come in two forms:

General obligation bonds. These municipal bonds are backed by the full faith and credit of the issuing government, meaning repayment is secured by taxes.
Revenue bonds. These bonds are backed by revenue generated from the specific project they finance, such as toll roads or utilities.

Interest earned from municipal bonds is federally tax-exempt and may also be exempt from state and local taxes if the bond is issued within the investor’s home state.

Private Activity Bonds

Some municipal bonds, known as private activity bonds, finance projects that benefit both the public and private sectors, such as hospitals, airports and low-income housing. Some qualified private activity bonds can produce interest that is excluded from regular federal taxable income, but that interest may still enter the AMT calculation. Other private activity bonds do not qualify for the federal interest exclusion.

U.S. Savings Bonds Used for Education

Certain U.S. savings bonds, such as Series EE and Series I bonds, can provide tax-exempt interest if the proceeds are used for qualified higher education expenses. The federal education exclusion applies only when its requirements are met, including rules involving the bond, the owner’s age when it was issued, eligible education costs and the taxpayer’s income.

Bonds Issued by U.S. Territories

Interest earned from qualifying bonds issued by U.S. territories, such as Puerto Rico, Guam or the U.S. Virgin Islands, is generally exempt from federal, state and local income taxes for U.S. investors. These bonds can offer strong tax benefits for investors seeking completely tax-free income.

How Tax-Exempt Interest Can Affect Social Security Taxes

A federal income tax exemption on bond interest does not necessarily keep that interest out of every tax calculation. Social Security is an important case because tax-exempt interest is counted when determining whether a recipient’s benefits become taxable.

Consider a single retiree who receives $30,000 of Social Security benefits, $15,000 of taxable pension income and $6,000 of municipal bond interest. Half of the Social Security benefits is $15,000. Adding the $15,000 pension and $6,000 of tax-exempt interest produces $36,000 for the initial comparison used to evaluate the taxation of the benefits.

$15,000 + $15,000 + $6,000 = $36,000

The $6,000 of municipal bond interest remains excluded from regular federal taxable interest income, but it still changes this Social Security calculation. This is one reason investors should consider more than the stated tax-free yield when deciding how municipal bonds fit into retirement income planning.

Frequently Asked Questions

Are all municipal bonds tax-exempt?

Not all municipal bonds are fully tax-exempt. While most are exempt from federal income tax, the treatment of private activity bonds depends on the type of bond, and interest from certain qualifying private activity bonds can enter the AMT calculation. Additionally, municipal bonds issued outside of an investor’s home state may still be subject to state and local taxes.

Can tax-exempt interest income impact Social Security benefits?

Yes, tax-exempt interest income is included in the combined income calculation used to determine the taxable portion of Social Security benefits. Depending on the taxpayer’s filing status and other income, including tax-exempt interest in the calculation can result in some Social Security benefits becoming taxable. Federal rules can make as much as 85% of the benefits taxable, although that does not mean the benefits are taxed at an 85% rate.

How does tax-exempt interest compare to taxable bonds?

While tax-exempt bonds offer the benefit of avoiding federal income tax, they typically provide lower yields than taxable bonds. Investors should compare after-tax returns to determine whether a tax-exempt or taxable bond investment provides the best financial advantage.

Bottom Line

A woman reviewing her financial plan online.

Tax-exempt interest income can help reduce your tax bill, especially if you’re in a high tax bracket. Investments like municipal bonds or certain U.S. savings bonds offer interest that isn’t taxed by the federal government and sometimes by states. However, this income must still be reported and can affect taxes on Social Security benefits or the alternative minimum tax, including interest from certain private activity bonds. A financial advisor can help you decide if tax-exempt investments make sense for your situation.

Tax Planning for Retirement

A financial advisor can recommend strategies to manage taxes for your retirement portfolio. Finding a financial advisor doesn’t have to be hard. SmartAsset’s free tool matches you with vetted financial advisors who serve your area, and you can have a free introductory call with your advisor matches to decide which one you feel is right for you. If you’re ready to find an advisor who can help you achieve your financial goals, get started now.
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