Unlimited tax general obligation bonds are municipal bonds backed by the issuer’s power to levy property taxes at whatever rate is needed to repay the debt, with no legal cap on that rate. That unlimited taxing authority is what separates a UTGO bond from other municipal debt and is the main reason these bonds carry some of the strongest credit profiles in public finance. Because repayment draws on the entire local property tax base rather than a single revenue stream, UTGO bonds fund major community infrastructure while giving investors a level of security few other municipal instruments match.
How the Unlimited Tax Levy Works
The word “unlimited” refers to a specific legal power: the issuer can set its property tax rate as high as necessary to cover annual debt payments, free from the statutory or constitutional rate caps that normally restrict local taxation. Most municipalities operate under laws that limit how high their general-purpose property tax rate can go. UTGO bonds carve out an exception. The debt service levy sits outside those limits, so even if the municipality’s regular taxing authority is maxed out, the bond payment tax keeps flowing.
Each year, the municipality calculates how much it owes in principal and interest and sets a separate tax rate to generate exactly that amount. The math works in reverse. Total debt service divided by the jurisdiction’s taxable property value produces the rate. If property values drop, the rate rises automatically to fill the gap. If values climb, the rate falls. The payment to bondholders stays constant either way. This is why UTGO bonds are sometimes called self-correcting debt: the revenue source adjusts to meet the obligation rather than the other way around.
The property tax used for debt service is an ad valorem tax, based on the assessed value of real property inside the issuer’s boundaries. Every taxable parcel contributes. That broad base is a core part of what makes the security so strong. No single property owner or neighborhood bears the full weight, and the tax obligation travels with the property if it changes hands.
The Full Faith and Credit Pledge
Beyond the unlimited levy, UTGO bonds carry a full faith and credit pledge. This is the issuer’s formal promise to use every legal financial tool available to make payments on time. If the dedicated property tax somehow falls short, the municipality must tap its general fund, redirect other revenues, or take whatever steps are legally necessary to cover the gap.
Revenue bonds, by contrast, are repaid only from the income a specific project generates, like tolls from a highway or fees from a water system. If that revenue dries up, bondholders are out of luck unless additional security was negotiated. With a UTGO bond, bondholders have a claim against the full breadth of the issuer’s income, not just one revenue stream. That distinction matters most during economic downturns, when project-specific revenues can crater while the property tax base, though it may shrink, rarely disappears entirely.
The pledge creates an enforceable legal obligation. If a municipality fails to levy a sufficient tax or diverts debt service funds to other uses, bondholders can seek a court order compelling the government to act, sometimes through a writ of mandamus. That enforcement power is one reason issuers rarely default on UTGO debt. The legal consequences of stiffing bondholders are severe enough that most governments will cut other spending first.
UTGO Bonds vs. Limited Tax General Obligation Bonds
The most common point of confusion is the difference between unlimited tax and limited tax general obligation bonds. Both carry a full faith and credit pledge, and both require the issuer to budget for debt service annually. The critical difference is the tax rate ceiling.
- With UTGO bonds, the issuer can raise the property tax levy as high as needed to cover debt payments. No rate cap applies to the debt service portion of the tax bill, and voter approval is typically required before issuance.
- With LTGO bonds, the property tax backing the bonds is capped at a maximum rate or amount set by law. If costs rise or property values fall, the issuer cannot simply raise the levy beyond that limit. Voter approval is often not required, which makes LTGO bonds easier to issue but somewhat less secure.
For investors, the practical difference is mostly about risk. A UTGO bond’s unlimited levy provides a wider margin of safety because the issuer can always generate more revenue. An LTGO bond’s capped levy means the issuer might eventually run out of room if the tax base deteriorates. Credit rating agencies recognize this distinction, though the gap in ratings between the two types for the same issuer is often narrow because defaults on either type remain rare.
Who Approves the Bonds
A municipality cannot issue UTGO bonds on its own authority. Because the bonds pledge unlimited taxing power over local property, virtually every state requires voter approval before the debt is created. The process starts when the local governing body, whether a city council, county commission, or school board, passes a resolution calling for a bond election. That resolution typically specifies the maximum dollar amount of the proposed debt and the projects it will fund.
Voters then see a ballot proposition describing the financial commitment: how much the municipality wants to borrow, what it plans to build or improve, and how the debt will be repaid. Many states require a fiscal impact statement or similar disclosure so voters can estimate the effect on their tax bills. Most jurisdictions require a simple majority to approve the bonds. Some states demand a supermajority, commonly 60 percent, particularly for school district bonds or when the proposed debt would push the issuer past a certain threshold. Without certified voter approval, the bonds are void and unenforceable.
Voter authorization is not the only ceiling. Every state also caps total outstanding general obligation debt, usually as a percentage of the jurisdiction’s assessed property value. These caps vary widely by state and by the type of government entity, and voted UTGO debt typically has a higher ceiling than non-voted LTGO debt. Bond counsel verifies compliance with these limits as part of every issuance.
What UTGO Bond Proceeds Can Fund
UTGO proceeds are restricted to capital projects: physical assets with a long useful life, such as school buildings, fire stations, libraries, roads, bridges, water treatment facilities, and drainage infrastructure. The money cannot be used for day-to-day operating expenses such as employee salaries, utility bills, or routine maintenance. Federal tax rules reinforce this distinction by classifying operating costs as working capital expenditures and limiting an issuer’s ability to fund them with tax-exempt bond proceeds.1Internal Revenue Service. Tax-Exempt Bond Basics: Proceeds and Allocations
The ballot proposition approved by voters defines exactly which projects are eligible. If voters authorized bonds for a new high school and road improvements, the municipality cannot redirect the money to build a golf course. Proceeds are held in restricted accounts and disbursed only for the listed purposes. Auditors verify that expenditures match the ballot language, and misuse can jeopardize the bonds’ tax-exempt status or trigger legal challenges from both bondholders and taxpayers.
The general rule is that the expected useful life of the asset should exceed the maturity of the bonds paying for it. This keeps the debt aligned with the benefit. Residents who use the infrastructure over its lifetime are the same residents paying down the bonds through their property taxes. Typical maturities run 20 to 30 years, though some issues extend to 40 years for especially long-lived infrastructure.
Tax Treatment for Investors
Interest earned on UTGO bonds is generally excluded from federal income tax. Section 103 of the Internal Revenue Code provides that gross income does not include interest on obligations issued by a state or political subdivision, as long as the bonds meet certain requirements.2Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds Because UTGO bonds are governmental bonds rather than private activity bonds, the interest is also generally exempt from the Alternative Minimum Tax for individual taxpayers.
That exemption has a direct effect on pricing. An investor in a high tax bracket might accept a lower yield on a UTGO bond than on a comparably rated corporate bond because the after-tax return is competitive or better. This benefits the issuing municipality too. The tax exemption lets governments borrow at lower interest rates than they otherwise could, saving taxpayers money over the life of the bonds.
The exemption is not automatic. The bonds must be issued in registered form, must not be arbitrage bonds under Section 148, and must comply with the information reporting requirements of Section 149.2Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds Issuers file IRS Form 8038-G at issuance to document compliance.3Internal Revenue Service. About Form 8038-G, Information Return for Tax-Exempt Governmental Obligations If the IRS later determines that the bonds failed to meet these requirements, the interest becomes retroactively taxable, a serious risk for bondholders even though it rarely happens. Some states also exempt in-state municipal bond interest from state income tax, further increasing the effective yield for local investors.
Are UTGO Bonds Risk-Free?
No. Investment-grade general obligation bonds default far less often than corporate debt. From 1970 to 2024, the ten-year cumulative default rate for investment-grade municipal bonds was 0.10 percent, compared to 2.24 percent for investment-grade corporate bonds. Below investment grade, municipals defaulted at 7.14 percent over ten years versus 29.74 percent for corporates. Recovery rates on municipal defaults also tend to be higher.
Those numbers should not breed complacency. Detroit’s 2013 bankruptcy filing showed that even UTGO bonds backed by an unlimited tax pledge are not bulletproof. The city initially proposed treating its UTGO debt as unsecured, which would have meant devastating losses for bondholders. After litigation and negotiation, UTGO bondholders improved their recovery from an initially proposed 15 percent to roughly 74 percent by arguing that Michigan law created a statutory lien on the dedicated tax levy and that those tax revenues qualified as special revenues under the Bankruptcy Code. A meaningful recovery, but a long way from the full repayment “unlimited tax” and “full faith and credit” seem to promise.
Detroit exposed a key ambiguity: the treatment of UTGO bonds in Chapter 9 municipal bankruptcy depends heavily on state law. Some states have adopted statutory liens that explicitly secure general obligation bondholders, giving their claims priority in bankruptcy. Others have not. Whether a UTGO bond would be treated as a secured or an unsecured claim in any given bankruptcy is an open legal question that turns on the state where the issuer is located.
Credit rating agencies evaluate UTGO bonds based on the local economy, the issuer’s debt levels and revenue mix, management quality, and the legal protections in place. A strong, diversified tax base with stable or growing property values will support a high rating. A shrinking population, concentrated industry dependence, or poor fiscal management will push ratings down regardless of the unlimited tax pledge. The pledge is a powerful tool. It does not guarantee the political will or economic capacity to use it indefinitely.
Buying UTGO Bonds
Most UTGO bonds are sold in $5,000 face-value increments, a market convention that has been standard since at least the 1970s.4Municipal Securities Rulemaking Board. Minimum Denominations of Municipal Securities You can buy them at initial offering through a broker-dealer or on the secondary market after issuance. Pricing, availability, and yield depend on the issuer’s credit rating, the bond’s remaining maturity, and prevailing interest rates.
Once bonds are outstanding, issuers must file annual financial information, audited financial statements, and reports of certain material events to the Municipal Securities Rulemaking Board’s EMMA system under SEC Rule 15c2-12.5eCFR. 17 CFR 240.15c2-12 – Municipal Securities Disclosure6Municipal Securities Rulemaking Board. Continuing Disclosures Any investor can access these filings for free, along with official statements and trade data for virtually every outstanding municipal bond. EMMA is the best starting point for researching a specific issue before you buy.
Because the interest is generally exempt from federal income tax, UTGO bonds are most valuable to investors in higher tax brackets. If you are in a lower bracket or investing through a tax-advantaged account like an IRA, the tax exemption provides less benefit, and you may find better after-tax returns elsewhere. Whether a UTGO bond makes sense in your portfolio depends on your marginal tax rate, your need for stable income, and your comfort with the credit profile of the specific issuer.