Municipal bonds are usually free from federal income tax, but state and local taxes depend on where you live and where the bond was issued

The federal government does not tax the interest you earn on most municipal bonds. This is the main reason people buy them — the after-tax return can be higher than a taxable bond paying a higher rate, depending on your tax bracket. However, "tax-free" is incomplete. You may owe state income tax, local income tax, or both, depending on which state issued the bond and which state you live in.

The tax treatment also changes if you sell the bond before maturity. Capital gains — the profit you make when you sell — are taxed like any other investment gain. And certain municipal bonds, called private activity bonds, are subject to the federal alternative minimum tax (AMT), which can override the usual federal exemption for high-income earners.

Key Takeaways

  • Interest from municipal bonds is exempt from federal income tax, but you owe capital gains tax if you sell the bond for more than you paid.
  • State and local income tax on municipal bond interest depends on the bond's issuer and your state of residence — in-state bonds are usually exempt from your state tax, out-of-state bonds usually are not.
  • Private activity bonds and certain other types of municipal bonds may be subject to federal alternative minimum tax even though their interest is nominally tax-free.
  • The tax benefit of a municipal bond is most valuable to people in high federal tax brackets; lower-income earners may earn more after-tax from a regular taxable bond.

Federal income tax exemption and how it works

The federal government exempts the interest paid on municipal bonds from federal income tax. This exemption is written into the Internal Revenue Code and applies to bonds issued by states, cities, counties, and other local government bodies to fund public projects like roads, schools, and water systems.

When you receive an interest payment on a municipal bond, you do not report that interest as income on your federal tax return. The bond issuer does not send you a 1099-INT form for the interest, and the IRS does not expect to see it reported. This is different from a corporate bond or a Treasury bond, where you must report all interest as taxable income.

The exemption applies only to interest, not to other forms of income from the bond. If you buy a municipal bond at a discount — below its face value — and hold it to maturity, the difference between what you paid and what you receive at maturity is treated as interest and is also exempt. However, if you buy a bond at a premium — above its face value — the premium is not deductible.

State and local income tax on municipal bond interest

Most states tax the interest on out-of-state municipal bonds but exempt the interest on in-state bonds. This means if you live in New York and own a New York municipal bond, you owe no New York state income tax on the interest. If you own a California municipal bond while living in New York, you owe New York state income tax on that interest.

A handful of states do not tax income at all — including Florida, Texas, Washington, and Wyoming — so residents of those states owe no state income tax on any municipal bond interest, regardless of where the bond was issued. Residents of other states that do tax income must check their own state's rules, because some states have reciprocal agreements or special rules for certain types of bonds.

Local income tax works the same way. If your city or county taxes income and you own a bond issued outside your locality, you typically owe local tax on the interest. If you own a bond issued by your own city or county, you usually do not. The rules vary by locality, so you should check with your tax preparer or your state's department of revenue.

Capital gains tax when you sell before maturity

If you sell a municipal bond before it matures, any profit you make is subject to federal capital gains tax. This is true even though the interest itself is tax-free. If you bought the bond for $9,500 and sold it for $10,200, the $700 gain is taxable at your long-term or short-term capital gains rate, depending on how long you held it.

The same rule applies to state and local capital gains taxes. If your state taxes capital gains, you owe tax on the gain from selling a municipal bond, whether the bond was issued in-state or out-of-state. The tax-free status of the interest does not extend to the sale price.

If you sell at a loss, you can deduct the loss against other capital gains or, up to $3,000 per year, against ordinary income. This is the same treatment as any other investment loss.

Private activity bonds and the alternative minimum tax

Not all municipal bonds are exempt from federal tax. Private activity bonds — bonds issued to finance projects that benefit a private business or individual, such as a sports stadium or a private hospital — are subject to the federal alternative minimum tax (AMT).

The AMT is a separate tax calculation that applies to high-income earners. If your AMT liability is higher than your regular federal income tax liability, you pay the AMT instead. The interest on private activity bonds counts as a preference item in the AMT calculation, which can trigger the tax for people who would otherwise be exempt.

Your bond issuer or broker should tell you whether a bond is a private activity bond. If you are subject to the AMT or think you might be, ask before you buy.

Comparing the after-tax return to taxable bonds

The real value of a municipal bond depends on your tax bracket. A municipal bond paying 3 percent interest is worth more to someone in the 37 percent federal tax bracket than to someone in the 12 percent bracket, because the tax savings are larger.

To compare a municipal bond to a taxable bond, calculate the taxable equivalent yield: divide the municipal bond's interest rate by one minus your combined federal and state tax rate. For example, if a municipal bond pays 3 percent and your combined tax rate is 40 percent, the taxable equivalent yield is 3 ÷ (1 − 0.40) = 5 percent. This means you would need a taxable bond paying 5 percent to earn the same after-tax return.

Lower-income earners often earn more after-tax from a taxable bond, because the tax savings from a municipal bond are worth less to them. Higher-income earners usually benefit more from the tax exemption.

How to report municipal bond interest on your tax return

Even though municipal bond interest is not taxable, you must still report it on your federal tax return. On Form 1040, line 8b, you report the total interest from municipal bonds, but you do not include it in your taxable income. This is called "tax-exempt interest" and is used to calculate certain credits and deductions that phase out at higher income levels.

You do not need to itemize deductions or meet any threshold to exclude the interest. The exclusion is automatic. Your broker will send you a Form 1099-INT that shows the municipal bond interest separately from taxable interest.

For state and local taxes, follow your state's rules. Most states that tax income require you to report municipal bond interest on your state return, even if it is exempt from state tax. Some states do not require this reporting if the bond is issued in-state.

Frequently Asked Questions

Do I owe tax on municipal bond interest if I live in a state with no income tax?

No federal income tax applies regardless of where you live. If you live in a state that does not tax income — such as Florida, Texas, or Washington — you owe no state income tax on municipal bond interest either. If you live in a state that does tax income, you owe state tax on out-of-state municipal bonds but usually not on in-state bonds.

What happens to the tax exemption if I inherit a municipal bond?

The interest remains tax-exempt. The tax-free status of the bond does not change when it passes to a new owner. However, if you sell the inherited bond, any gain between what you paid (which is stepped up to the bond's value at the time of inheritance) and the sale price is subject to capital gains tax.

Are municipal bond funds taxed the same way as individual bonds?

Municipal bond mutual funds and exchange-traded funds pass through tax-exempt interest to you, so you do not owe federal tax on that portion of your distributions. However, if the fund sells bonds at a gain, those capital gains are taxable. The fund's prospectus will show what portion of distributions is tax-exempt and what portion is taxable.

Can I deduct a loss on a municipal bond?

Yes. If you sell a municipal bond for less than you paid, you can deduct the loss against other capital gains or up to $3,000 of ordinary income per year. Any loss above $3,000 carries forward to future years. This is the same treatment as any other investment loss.

Do I owe tax on municipal bond interest if I am subject to the alternative minimum tax?

Interest on regular municipal bonds is exempt from the AMT. However, interest on private activity bonds is included in the AMT calculation and may trigger AMT liability. Ask your broker or the bond issuer whether a bond is a private activity bond before you buy.