The difference between taxable and tax-exempt interest

Taxable interest is money earned from savings accounts, bonds, CDs, and loans that you must report to the IRS and pay income tax on. Tax-exempt interest is money earned from certain municipal bonds and other specific investments that you do not owe federal income tax on, though you still report it on your tax return.

The key difference comes down to who issued the bond or account. Interest from banks and most bonds issued by corporations or the federal government is taxable. Interest from bonds issued by states, cities, and some local agencies is usually tax-exempt at the federal level—and sometimes at the state level too, depending on where you live.

You need to know which type you have because the IRS requires you to report all interest income, even tax-exempt interest. The form you receive from your bank or investment company will tell you which category each payment falls into, and you will enter that information on your tax return.

Key Takeaways

  • Taxable interest from savings accounts, CDs, and corporate bonds must be reported and is subject to federal income tax at your regular tax rate.
  • Tax-exempt interest from municipal bonds is not subject to federal income tax, though you still report it on your return in a separate section.
  • The IRS sends you a 1099-INT form for taxable interest and a 1099-OID or similar form for tax-exempt interest, showing exactly how much you earned.
  • Some tax-exempt interest may still be subject to state income tax depending on which state issued the bond and which state you live in.
  • You must report all interest income on your tax return, even if it is tax-exempt, because the IRS tracks it separately.

What counts as taxable interest

Taxable interest includes earnings from savings accounts, money market accounts, certificates of deposit (CDs), Treasury bonds, corporate bonds, and any loan you made to another person. If a bank or financial institution paid you interest, or if someone borrowed money from you and paid you interest, that income is taxable.

You report taxable interest on Form 1040 (your main tax return) under the income section. If you earned more than $1,500 in interest during the year, you also file Schedule B to list each source. The interest is taxed at your ordinary income tax rate—the same rate that applies to your wages or salary.

Even small amounts of interest count. If you earned $15 in interest from a savings account, that $15 is taxable income. Your bank will send you a Form 1099-INT showing the total interest you earned from that account during the year, and you use that form to fill out your return.

What counts as tax-exempt interest

Municipal bonds are the most common source of tax-exempt interest. These are bonds issued by states, cities, counties, and other local government agencies to fund projects like schools, roads, water systems, and public buildings. The interest you earn from these bonds is not subject to federal income tax.

Some other sources of tax-exempt interest include bonds issued by certain nonprofit organizations and U.S. savings bonds used for education (under specific conditions). However, the vast majority of tax-exempt interest comes from municipal bonds.

Tax-exempt interest still appears on your tax return, but in a separate section that does not count toward your taxable income. You receive a Form 1099-OID or similar statement showing the amount, and you enter it on line 2a of Form 1040 (or the equivalent line on your state return if applicable). The IRS tracks it to make sure you are not hiding income, but it does not increase the tax you owe.

State and local tax treatment of municipal bond interest

Federal tax-exempt interest may still be subject to state income tax depending on where the bond was issued and where you live. Most states do not tax interest from bonds issued within that state, but they do tax interest from bonds issued in other states.

For example, if you live in New York and own a bond issued by New York City, the interest is usually exempt from both federal and New York state income tax. If you live in New York but own a bond issued by California, the interest is exempt from federal tax but subject to New York state income tax.

A few states—including Illinois, Iowa, Kansas, Louisiana, Mississippi, Missouri, Oklahoma, and South Carolina—do not tax municipal bond interest at all, regardless of where the bond was issued. Check your state's tax rules or ask your investment advisor about the specific bonds you own.

How to report interest on your tax return

Your bank or investment company sends you a Form 1099-INT for taxable interest and a Form 1099-OID (or Form 1099-INT marked as tax-exempt) for tax-exempt interest. These forms arrive by January 31 each year and show the interest you earned during the previous year.

For taxable interest, you enter the total on line 1b of Form 1040. If you earned more than $1,500 in interest from multiple sources, you also complete Schedule B, which lists each source separately. For tax-exempt interest, you enter the amount on line 2a of Form 1040 in the section labeled "Interest."

Keep your 1099 forms with your tax records for at least three years. The IRS receives copies of these forms from your financial institutions, so your return must match what they report. If you lose a form, contact the financial institution and ask for a duplicate.

When you might owe tax on tax-exempt interest

Tax-exempt interest can affect your taxes in an indirect way. The IRS counts tax-exempt interest as income when calculating whether you owe the Alternative Minimum Tax (AMT), a separate tax system that applies to higher-income taxpayers. If you have substantial tax-exempt interest, you may owe AMT even though the interest itself is not taxable.

Tax-exempt interest also counts toward the income threshold that determines whether your Social Security benefits are taxable. If your combined income (including tax-exempt interest) exceeds certain limits, a portion of your Social Security becomes subject to federal income tax.

These situations are uncommon for most people, but if you earn significant tax-exempt interest, ask a tax professional whether either of these rules applies to you.

Common mistakes to avoid

The most common mistake is forgetting to report tax-exempt interest on your return. Even though you do not owe tax on it, you must still list it. The IRS cross-checks your return against the forms your financial institutions file, and a missing line item can trigger an audit notice.

Another mistake is assuming all municipal bond interest is tax-exempt everywhere. Some bonds issued by municipalities are actually taxable (called "taxable municipals"), and some are exempt from federal tax but not state tax. Your 1099 form will specify which type you own, so read it carefully.

Do not estimate your interest income. Use the exact amounts shown on your 1099 forms. If a form shows $47.82 in interest, enter $47.82—not $48 or $50. The IRS has the same form, and mismatches trigger automatic notices.

Frequently Asked Questions

Do I have to report tax-exempt interest if I do not owe tax on it?

Yes. You must report all interest income on your tax return, including tax-exempt interest. The IRS requires you to list it separately so they can verify you are not hiding other income. Failing to report it can result in an audit notice, even though the interest itself is not taxable.

What if I did not receive a 1099 form for my interest income?

Contact the financial institution that paid the interest and ask for a duplicate form. If they cannot provide one, you can still report the interest based on your own records—bank statements, investment statements, or year-end summaries. Keep documentation of what you report in case the IRS asks questions.

Can I deduct the cost of buying municipal bonds?

No. You cannot deduct the purchase price of a bond or the cost of investment information related to buying bonds. However, if you sell a bond at a loss, you may be able to claim a capital loss on your return, which can offset other investment gains.

Does tax-exempt interest count as income for other purposes?

Yes, in some cases. Tax-exempt interest counts toward the income limits that determine whether your Social Security is taxable and whether you owe the Alternative Minimum Tax. It also counts toward income limits for certain tax credits and deductions. Ask a tax professional if you have substantial tax-exempt interest.

What is the difference between a 1099-INT and a 1099-OID?

A 1099-INT reports interest paid during the year from savings accounts, CDs, bonds, and other sources. A 1099-OID reports original issue discount, which is a type of interest earned on certain bonds purchased at a discount. Both must be reported on your return, but they go on different lines depending on whether the interest is taxable or tax-exempt.