A general obligation bond, or GO bond, is a form of municipal debt backed by the issuing state or local government’s full taxing power and general revenue rather than by the income from any single project. Governments use these bonds to finance long-term public works like schools, highways, and water systems. Because the issuer pledges every legally available revenue source toward repayment, GO bonds sit among the safest fixed-income investments available: investment-grade municipal bonds defaulted at a five-year cumulative rate of just 0.04% between 1970 and 2022.1Moody’s Investors Service. US Municipal Bond Defaults and Recoveries 1970-2022
What “Full Faith and Credit” Actually Means
The defining feature of a GO bond is the pledge of full faith and credit. The issuer promises to repay bondholders using every legally available revenue source, not a single dedicated stream.2Municipal Securities Rulemaking Board. Sources of Repayment If property tax collections fall short, the government can draw on sales taxes, income taxes, license fees, or anything else flowing into its general fund. You don’t have to worry about whether a particular toll road turns a profit or a water utility collects enough in fees.
The mechanics vary more than most investors realize. Local governments typically repay GO bonds from ad valorem property taxes, while state-issued GO bonds are often repaid through legislative appropriations.3Municipal Securities Rulemaking Board. MSRB Glossary of Municipal Securities Terms A county GO bond in one state might carry an ironclad property tax pledge, while a city GO bond elsewhere depends on annual budget appropriations. The common thread is that the government’s broad revenue base stands behind the debt.
Unlimited Tax vs. Limited Tax GO Bonds
Not all GO bonds carry the same strength of pledge. The distinction hinges on whether the issuer faces a cap on how much it can raise taxes to service the debt.
Unlimited Tax GO Bonds
An unlimited tax general obligation bond (UTGO) lets the issuer levy property taxes without any rate cap to cover debt service. If assessed values drop and revenue falls short, the government can raise the tax rate as high as necessary to make bondholders whole.2Municipal Securities Rulemaking Board. Sources of Repayment That open-ended commitment translates into stronger credit ratings and lower borrowing costs.
Limited Tax GO Bonds
A limited tax general obligation bond (LTGO) caps the property tax rate the issuer can impose, usually through a state constitutional or statutory limit. The government still pledges its full faith and credit, but it cannot raise the millage rate above the legal ceiling even if collections fall short.3Municipal Securities Rulemaking Board. MSRB Glossary of Municipal Securities Terms The issuer instead depends on growth in assessed property values to increase total revenue within the fixed rate.
If the local tax base shrinks or stagnates, the issuer’s capacity to meet payments is squeezed. LTGO bonds typically trade at slightly higher yields to compensate for that limitation.
GO Bonds vs. Revenue Bonds
The fundamental divide in the municipal market is between general obligation bonds and revenue bonds, and it comes down to what stands behind the debt. A GO bond commits the issuer’s entire fiscal capacity. A revenue bond commits only the cash flow from the specific project it finances.2Municipal Securities Rulemaking Board. Sources of Repayment
If a toll road financed by revenue bonds underperforms, bondholders absorb the loss. They cannot force the municipality to redirect property taxes or general fund revenue to cover the shortfall. With a GO bond, the issuer’s entire tax base effectively guarantees repayment, so your risk tracks the overall economic health of the jurisdiction rather than any single project’s performance.
A third category blends both structures. Sometimes called double-barreled bonds, these pledge a specific revenue stream and the issuer’s general taxing power as backup. If project revenue falls short, the general fund covers the gap.
Tax Treatment of GO Bond Interest
One of the biggest reasons investors buy GO bonds is the federal tax exemption on interest. Under federal law, gross income does not include interest on state or local bonds, provided the bonds meet certain requirements and are not classified as private activity bonds, arbitrage bonds, or bonds that fail registration requirements.4Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds GO bonds issued for traditional public purposes like schools and roads almost always qualify. Interest is also generally excluded from the alternative minimum tax, unlike interest on many private activity bonds.
An additional benefit applies when you live in the state that issued the bond. In that case, the interest is often exempt from state and local income taxes as well, creating a double tax-exempt return.5Municipal Securities Rulemaking Board. Municipal Bond Basics To compare a tax-exempt yield against a taxable alternative, divide the municipal bond’s yield by one minus your marginal tax rate. A 3.5% tax-exempt yield equates to roughly 5.45% on a taxable bond for someone in the 35.8% federal bracket.
Safety Record and the Risks That Remain
The default numbers behind GO bonds are striking. Between 1970 and 2022, investment-grade municipal bonds had a five-year cumulative default rate of just 0.04%, compared with 0.87% for investment-grade corporate bonds. Even speculative-grade municipal bonds defaulted at 4.63% over five years, roughly a quarter of the 18.71% rate for speculative-grade corporate debt. General government issuers, the category that includes most GO bonds, defaulted at 0.03% across all rated credits.1Moody’s Investors Service. US Municipal Bond Defaults and Recoveries 1970-2022
Those numbers are reassuring, but GO bonds are not risk-free. Several risks still apply.
Interest Rate Risk
Like all fixed-rate bonds, GO bonds lose market value when interest rates rise. If you own a bond paying 4% and market rates climb to 5%, no one will pay full price for your lower-yielding bond on the secondary market. The longer the maturity, the sharper the price swing. Bonds maturing in under five years have low sensitivity to rate changes; bonds maturing in over ten years are highly sensitive. If you hold to maturity, the fluctuation doesn’t affect your actual return, but it matters if you need to sell early.
Credit and Default Risk
Municipal defaults are rare but not impossible. In a Chapter 9 bankruptcy filing, GO bonds are treated as general unsecured debt. The municipality is not required to make principal or interest payments during the case, and the obligations are subject to negotiation and possible restructuring under the plan of adjustment.6United States Courts. Chapter 9 – Bankruptcy Basics The full faith and credit pledge does not guarantee bondholders a seat at the front of the line. Whether a state statutory lien protects GO bondholders in bankruptcy depends on the specific language of the lien under state law.
Liquidity Risk
Municipal bonds trade less frequently than stocks or Treasury bonds. Many GO bonds sit in buy-and-hold portfolios and rarely change hands, which can make it hard to sell at a fair price if you need cash quickly. Bonds held inside municipal bond ETFs tend to be somewhat more liquid, but the secondary market as a whole is thinner than what equity investors are used to.
Call Risk
Many GO bonds include call provisions that let the issuer redeem the bonds before maturity, typically after a set number of years. If interest rates drop, the issuer may call your bonds and refinance at a lower rate, forcing you to reinvest at less favorable yields.
How to Research and Buy GO Bonds
Individual investors can buy GO bonds through a brokerage account, either on the primary market when bonds are first issued or on the secondary market from other investors. Most brokers earn their compensation through a markup over what they paid for the bond, which may be disclosed on your confirmation statement.7Investor.gov. Municipal Bonds Ask about markups and commissions before you trade.
Before buying, research specific bonds on EMMA, the Electronic Municipal Market Access system operated by the MSRB and designated by the SEC as the official repository for municipal securities data and disclosure documents.8Municipal Securities Rulemaking Board. EMMA – Electronic Municipal Market Access EMMA provides free access to offering documents, financial disclosures, trade prices, and credit ratings. It’s a research tool, not a trading platform, but it’s the best place to evaluate a municipal bond’s fundamentals before committing money. If you prefer diversification without the complexity of picking individual bonds, you can also get exposure to GO bonds through municipal bond mutual funds or exchange-traded funds.