General Obligation (GO) Bonds
General Obligation (GO) Bonds
General obligation bonds are backed by the full faith and credit of the issuing government — meaning the issuer pledges all its revenue and taxing power to service the debt. This makes them the safest class of municipal securities and typically the lowest-yielding.
Key takeaways
- GO bonds obligate the issuer to use all available resources — taxes, fees, reserves — to pay bondholders
- They are typically used for essential public services: schools, courthouses, roads, water systems
- Default rates on investment-grade GO bonds are extremely low, making them nearly as safe as Treasuries
- Yields are lower than revenue bonds because the credit risk is lower
- An issuer must usually obtain voter approval before issuing GO bonds, which serves as a political and financial check
The pledge behind the bond
When a municipality issues a general obligation bond, it provides what is legally called an "unlimited tax pledge." This means the issuer commits to levy whatever taxes are necessary — property taxes, sales taxes, income taxes (if authorized by state law) — to meet its obligations. There is no revenue source segregation: the issuer must pay bondholders before expanding services, cutting other services, or any other discretionary use of funds.
This pledge extends to all assets and revenues of the issuer. A city that issues GO bonds is essentially saying, "If we must choose between paying you and any other obligation, we will pay you." In practice, this rarely becomes a true crisis because municipalities have multiple revenue sources and are highly incentivized to maintain their credit rating.
A school district issuing a $100 million GO bond to build a high school is pledging that property taxes, state aid, and other revenues will service that debt over 20 or 30 years. If the district faces a budget shortfall, it cannot simply default; it must cut other spending, raise taxes, or seek emergency state aid. This political obligation, combined with legal obligation, creates a powerful enforcement mechanism.
Uses and frequency
GO bonds are issued for public purposes that benefit the community broadly: schools, libraries, highways, bridges, water treatment plants, courthouses, fire stations, police facilities, and parks. Any infrastructure or facility that serves a government function and is considered essential public good is a candidate for GO bond financing.
In 2022, general obligation bonds represented approximately 35% to 40% of all municipal bond issuances by count, though by dollar volume they were a smaller share. School districts are the largest issuers of GO bonds, followed by states, cities, and counties.
The frequency of GO bond issuance varies by economic cycle and interest rate environment. In low-rate years (like 2012 and 2021), municipalities rushed to issue to lock in cheap borrowing costs. In high-rate environments, they defer spending or use alternative financing.
Voter approval and referendum
In the United States, most GO bonds must be approved by voters before issuance. This is a constitutional or statutory requirement in nearly all states. A school district cannot unilaterally decide to issue $100 million in bonds; it must put the question on a ballot and secure majority approval. This requirement serves two purposes: it constrains government borrowing (voter discipline) and it forces issuers to publicly justify the expenditure.
This referendum process is a substantial safeguard. A proposed bond issue that seems reckless faces voter rejection. An issuer with a poor track record of cost control or waste will struggle to get approval. The political process, for all its inefficiencies, does screen out the worst projects.
However, voter approval also introduces volatility in timing. A bond issue scheduled for a spring election might fail; the district then reschedules for the fall. Issuers sometimes bundle popular and unpopular projects to improve chances of passage. Campaigns for and against bond measures are common and can be contentious.
Credit quality and rating determinants
Investment-grade GO bonds (BBB or better) rarely default. The historical default rate for this category is under 0.1% annually — far lower than investment-grade corporate bonds (roughly 0.25% annually). This is due to the breadth of the issuer's revenue base, its constitutional obligation to balance its budget (in most states), and the political will to avoid default.
However, credit quality varies enormously. A GO bond from the State of New Hampshire (AAA-rated) is nearly indistinguishable from a Treasury in risk. A GO bond from a declining industrial city or a district with weak finances might be rated A or BBB and carries more risk.
Credit raters examine four main factors:
-
Revenue base and diversity: Does the issuer rely on a few industries or revenue sources, or are they broad-based? A city dependent on a single large employer faces more risk than a diversified metropolitan area.
-
Fund reserves: Does the issuer maintain adequate emergency reserves? A city with 6 months of operating expenses in reserves is safer than one spending down reserves annually.
-
Demographics and economic trends: Is the population growing or shrinking? Are employers moving in or out? A declining region faces eventual revenue challenges regardless of current finances.
-
Pension and other long-term liabilities: Does the issuer face unfunded pension obligations, retiree health benefits, or other long-term costs that could squeeze future budgets?
All else equal, larger and wealthier jurisdictions have higher credit ratings. States with growing populations and strong economies (Texas, Florida, North Carolina) have higher ratings. States with flat or declining populations and older infrastructure (Illinois, New Jersey, West Virginia) often face lower ratings.
Comparable safety to Treasuries
A triple-A rated GO bond from a state or large city is nearly as safe as a Treasury bond. Both are backed by the U.S. government's full resources (for Treasuries, literal sovereignty and currency power; for AAA munis, a state or major city's taxing power). The probability of default in the next 10 years is negligible for either.
The yield difference reflects this. In May 2024, a 10-year Treasury yielded roughly 4.2%, while a AAA municipal bond of the same maturity yielded roughly 3.3%. The 90-basis-point difference is the "muni equivalent" — it compensates the Treasury investor for the tax advantage the muni investor receives.
For a high-income investor (37% federal tax bracket), the after-tax yield on the Treasury becomes 4.2% × (1 − 0.37) = 2.6%, making the 3.3% muni superior despite the lower stated yield.
Inflation and interest rate risk
Like all bonds, GO bonds carry interest rate risk. If you buy a 30-year GO bond at 3% and rates rise to 5%, the bond's price falls until its yield is competitive. If you sell before maturity, you realize a loss.
This risk is unrelated to credit risk. Even if the issuer never defaults, rising rates will reduce the market value of your bond. The longer the maturity, the greater this interest rate sensitivity.
GO bonds do not provide inflation protection in the way Treasury Inflation-Protected Securities (TIPS) do. A 3% GO bond issued in 2020 provided 3% nominal returns, but with 3-4% inflation in 2021-2022, the real return was near zero. Investors must choose between the inflation protection of TIPS (with the tax implications of annually-taxed inflation adjustments in a taxable account) and the tax-exempt advantage of munis.
Liquidity and trading
GO bonds, especially shorter-dated ones from large issuers, trade with reasonable liquidity in the secondary market. A ten-year GO bond from California or New York will find a buyer within minutes. A 20-year GO bond from a small county in a rural state might take days to find a buyer at a fair price.
For individual bond purchases, assume a bid-ask spread of 0.5% to 2% depending on the size and popularity of the bond. For mutual funds or ETFs holding GO bonds, liquidity is better because the fund manager can buy or sell your shares daily (though the fund itself may hold less liquid bonds).
Most individual investors should expect to hold GO bonds to maturity if they purchase them at retail. Selling early often requires accepting an unfavorable price due to illiquidity. This is less of a drawback for buy-and-hold investors but matters for those who think they might need the money.
Decision tree for GO bond allocation
Next
General obligation bonds are the bedrock of municipal finance, offering safety and tax efficiency. But many municipalities also issue revenue bonds, which offer higher yields in exchange for greater risk because they rely on specific project revenues rather than the broad taxing power of the issuer. In the next article, we'll explore what revenue bonds are and when they make sense.