Tax-Exempt Status of Municipal Bonds

Reprinted with permission from the Government Finance Officers Association

The information contained in this article is not intended as legal advice and may no longer be accurate due to changes in the law. Consult NHMA's legal services or your municipal attorney.

The following report titled Protecting Bonds to Save Infrastructure and Jobs was prepared by the National League of Cities, the National Association of Counties and the United States Conference of Mayors with assistance from the Government Finance Officers Association. It is reprinted here with permission.

Tax-exempt municipal bonds are the most important tool in the U.S. for financing investment in schools, roads, water and sewer systems, air¬ports, bridges and other vital infrastructure. State and local governments financed more than $1.65 trillion of infrastructure investment over the last decade (2003–2012) through the tax-exempt bond market. During that decade, $514 billion of primary and secondary schools were built with financing from tax exempt bonds; nearly $288 billion of financing went to general acute care hospitals; nearly $258 billion to water and sewer facilities; nearly $178 billion to roads, highways, and streets; nearly $147 billion to public power projects; and $105.6 billion to mass transit. These categories represent 90 percent of the total amount of municipal bonds used to finance infrastructure between 2003 and 2012. In 2012 alone, more than 6,600 tax-exempt municipal bonds financed over $179 billion worth of infrastructure projects.

Impact of Proposals to Limit/Eliminate Tax-Exempt Financing

Under the federal tax code, investors are not required to pay federal income tax on interest earned from most bonds issued by state and local governments. The tax exemption for municipal bond interest has been in law since the federal income tax was promulgated 100 years ago, and tax-exempt bonds have financed trillions of dollars of infrastructure investment over that time. The effect of this tax exemption is that state and local governments receive a lower interest rate on their borrowing than they would if their interest was taxable to investors. In typical market conditions, the tax exemption can save states and localities up to two percentage points on their borrowing rates.

Several legislative proposals have been offered to curtail or eliminate the federal tax exemption for municipal bond interest. One proposal would impose a tax-benefit cap of 28 percent for certain taxpayers on many itemized deductions and exclusions, including tax-exempt interest. The effect would be a partial tax on interest that would otherwise be exempt from income tax. In effect, the tax-exempt bond market would no longer be entirely tax-exempt. If the proposal to impose a 28-percent benefit cap on tax-exempt interest had been in effect during the last decade, it is estimated that this would have cost states and localities an additional $173 billion in interest expense for infrastructure projects financed over the past ten-year period.

For an investor in the 39.6-percent federal tax bracket, the tax benefit cap proposal would equate to an 11.6-percent tax on municipal bond interest income, the difference between the 39.6-percent tax rate and the 28-percent benefit cap. While it may appear that this tax would fall on high-bracket taxpayers, in effect, it would be it would be borne almost exclusively by state and local governments in the form of higher interest rates on their borrowing. Market analysts have estimated that this proposed tax on municipal bond interest would raise state and local borrowing costs by up to 70 basis points (0.70 percentage point) or more. Because the tax would apply not only to new state and local borrowing but also to all outstanding bonds, investors would be taxed on investment which they reasonably expected would be tax-exempt as long as they are outstanding, an unprecedented form of retroactive taxation. As a result, investors would face the new risk that Congress could tax interest on outstanding bonds even more in the future, a risk that would raise state and local borrowing costs even more and create unprecedented uncertainty for investors in the municipal securities market.

Some have proposed an even more onerous full federal income tax on municipal bond interest. For example, the National Commission on Fiscal Responsibility and Reform (the “Simpson-Bowles Commission”) in its 2010 deficit-reduction recommendations proposed full taxation for state and local interest for all newly-issued bonds. If this proposal had been in place during the 2003–2012 period, it is estimated that the $1.65 trillion of state and local infrastructure investment would have cost governments an additional $495 billion of interest expense.

Broad Use of Tax-Exempt Financing

Tax-exempt financing is used widely across the country by communities large and small. The $1.65 trillion of infrastructure financed by state and local governments in 2003–2012 was spread across nearly 58,000 individual transactions, with an average transaction size of $29 million. Bonds financed everything from large, multibillion transportation projects to school expansions of several hundred thousand dollars and are used by governments ranging from the largest states to the smallest towns and school districts. Because the interest on municipal bonds is usually exempt from state income taxation for residents of the states in which they are issued, investors tend to buy bonds issued within their states. In that manner, local investment is often financed to a significant degree by local capital.


Tax-exempt municipal bonds are the country’s most important source of financing for infrastructure investment. Municipal bonds represent a partnership among the federal government, state and local governments, and private investors in contributing to public infrastructure which creates jobs and improves economic efficiency. The proposals to limit or eliminate the federal tax exemption for municipal bond interest would substantially impair the federalist system of government that currently exists and shift unnecessary cost burdens to local taxpayers. Tax-exempt bonds maintain decision making and project selection at the state and local level, where citizens and elected officials can best determine where needs are greatest and where investments will generate the maximum return. Finally, tax-exempt bonds force market tests of investment projects, since investors will not commit capital until they are convinced the credit behind the borrowing is financially sound. The default rate on borrowing by states and localities is near zero.

Congress should preserve the tax exemption for interest on municipal bonds. The tax exemption has successfully provided trillions in low-cost financing for infrastructure investment. Curtailing or eliminating the tax exemption would raise costs for financially-strapped state and local governments and would result in less investment in infrastructure at a time when jobs are scarce and the physical state of our public works is deteriorating.

For more information, including talking points, sample letters to Congressional delegation members and the White House, and a draft resolution for municipalities to approve, please visit the Government Finance Officers Association (GFOA) Federal Tax Exemption on Municipal Bond Interest Resource Center by going to the Federal Government Relations menu choice at

Impact in New Hampshire

Many New Hampshire municipalities, school districts, and village districts finance major capital improvements through the New Hampshire Municipal Bond Bank.  The Bond Bank consolidates these loans and issues municipal general obligation bonds twice a year with very favorable interest rates.  Elimination of the tax-exempt status of municipal bonds would have a significant impact on the borrowing costs for Bond Bank participants.

For example, in June, 2013 the Bond Bank issued $53.3 million in 20-year bonds on behalf of 14 local government participants.  These bonds carry a 3.29% interest rate, totaling approximately $18.3 million in interest costs over the life of the bonds.  According to Executive Director Sheila St. Germain, elimination of the tax-exempt status of these bonds would have increased interest costs to approximately $29.4 million, a 60% increase in the cost of borrowing.


New Hampshire’s Congressional Delegation

Call our representaties and urge them to preserve the tax exemption for interest on municipal bonds!


144 Russell Senate Office Building, Washington, DC  20510

Tel:  202.224.3324

Fax:  202.224.4952



520 Hart Senate Office Building, Washington, DC  20510

Tel:  202.224.2841

Fax:  202.228.3194



1530 Longworth House Office Building, Washington, DC  20515

Tel:  202.225.5456

Fax:  202.225.5822



137 Cannon House Office Building, Washington, DC  20515

Tel:  202.225.5206

Fax:  202.225.2946