Municipal bond
What is Municipal bond?
A municipal bond is debt issued by a state, city, local authority, public agency, territory, or related conduit borrower, principally in the United States.
Common municipal structures
General obligation bonds rely primarily on an issuer's taxing resources, while revenue bonds rely on specified projects or revenue streams. Conduit issues can finance hospitals, universities, housing, or other eligible private activities, with repayment depending on the underlying borrower. Security, legal pledge, and remedies vary materially and must be read issue by issue.
Tax treatment and return
Interest may receive favorable federal, state, or local tax treatment depending on the security and investor, but rules are jurisdiction-specific. Compare tax-exempt and taxable yields using the investor's applicable marginal rates and constraints. Tax benefits do not remove credit, rate, call, inflation, or liquidity risk, and capital gains can receive different treatment.
Example
A city general obligation bond and an airport revenue bond can share a rating but rely on different resources. The airport bond may depend on passenger traffic and airline concentration, while the city bond depends on taxes and fiscal governance. A tax-exempt yield that appears lower may be competitive after tax for a qualifying investor.
How to interpret it
Identify the legal issuer, source of repayment, seniority, reserves, insurance, call schedule, and continuing disclosure. Review budget, debt service, pension burden, project economics, and concentration. Use yield to worst for callable structures. Trading can be less frequent than in major government markets, making evaluated prices and transaction data important.
Limitations
The municipal label covers heterogeneous credits and does not imply government-wide support. Tax rules can change and depend on investor circumstances. Ratings may not capture every fiscal, legal, climate, demographic, or project risk. Calls can limit price appreciation, while thin liquidity and small issue sizes can increase transaction cost and valuation uncertainty.
Practical checklist
Read the official statement and continuing disclosures, verify the repayment pledge, review audited finances and material events, and inspect comparable trades. Model revenue, expenses, debt service, reserves, calls, and refinancing. Confirm tax treatment with qualified advice. Compare after-tax yield, duration, credit, and liquidity with suitable taxable alternatives rather than choosing solely from headline tax exemption.
Also known as: muni, municipal security
Sources and further reading
- Municipal Bond Basics, Municipal Securities Rulemaking Board