Voter approval is required before a municipality can issue GO bonds, because the bond pledges the taxing power of the issuer and ultimately obligates taxpayers. This democratic check limits supply and contributes to GO bonds' lower yields compared to revenue bonds.
Unlimited tax GO bonds can raise taxes without a statutory cap. Limited tax GO bonds are backed by taxing power constrained to a specific maximum rate — slightly riskier than unlimited tax bonds.
Analogy: A GO bond is like borrowing money and putting your salary as collateral. Your lender knows you have the power to earn income (tax) to repay, which makes the loan safer than a business venture loan with no guaranteed income stream.
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Because of this additional risk, revenue bonds typically offer higher yields than comparable GO bonds. The bond's indenture includes protective covenants such as:
Net revenue pledge: Debt service paid from revenues after operating expenses (most common for utilities). Gross revenue pledge: Debt service paid before operating expenses — stronger for bondholders, less common.
Revenue bonds do not require voter approval because they do not pledge taxpayer money.
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The combination of federal tax exemption and high marginal tax rates makes munis especially valuable to investors in the 32%, 35%, or 37% federal brackets.
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Formula: TEY = Muni Yield / (1 - Investor's Marginal Tax Rate)
Example: A muni bond yields 4.0%. The investor is in the 35% federal tax bracket. TEY = 4.0% / (1 - 0.35) = 4.0% / 0.65 = 6.15%
This means the investor would need to earn 6.15% on a taxable bond to match the after-tax value of the 4.0% muni. If a corporate bond yields 5.8%, the muni is the better after-tax choice. If the corporate yields 6.5%, the corporate wins.
Key insight: TEY rises as the tax bracket rises. A muni yielding 4% is worth 5.71% TEY to a 30% bracket investor but 6.67% TEY to a 40% bracket investor — making munis progressively more attractive to higher earners.
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Tax treatment: IDBs issued for private purposes may generate interest that is a preference item for AMT. Some IDBs are fully taxable. Exam questions often test whether the interest is truly tax-exempt or subject to AMT.
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Example: A water utility bond backed by water revenues as primary repayment, with the city's taxing power as a secondary guarantee.
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All are short-term (typically under 1 year) and are repaid when the anticipated funds arrive.
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Quiz Questions:
Q1. A municipal bond yields 3.5%. An investor is in the 37% federal tax bracket. What is the tax-equivalent yield?
A) 4.78% B) 5.26% C) 5.56% D) 6.25%
Answer: C — TEY = 3.5% / (1 - 0.37) = 3.5% / 0.63 = 5.56%. Answer A uses (1 - 0.27), Answer B uses an incorrect divisor, and Answer D uses an incorrect divisor of 0.56. The exam will often provide the bracket and require the calculation from scratch.
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Q2. Which of the following statements about General Obligation bonds is CORRECT?
A) They are backed only by revenues from a specific project B) They require voter approval before issuance C) They do not pledge the taxing power of the issuer D) They typically offer higher yields than comparable revenue bonds
Answer: B — GO bonds pledge the taxing power of the municipality and therefore require voter approval since taxpayers are ultimately obligated. A describes revenue bonds. C is incorrect — GO bonds do pledge taxing power. D is backward — GO bonds are safer and thus yield less than comparable revenue bonds.
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Q3. A New York resident purchases a California municipal bond. Which of the following correctly describes the tax treatment of the interest?
A) Exempt from both federal and New York state income tax B) Exempt from federal income tax but subject to New York state income tax C) Subject to both federal and New York state income tax D) Exempt from federal, state, and estate taxes
Answer: B — Municipal bond interest is always exempt from federal income tax. However, the state exemption applies only in the issuing state. A New York investor buying a California bond still owes NY state income tax on that interest. D is wrong because munis are NOT exempt from federal estate tax.
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Q4. A revenue bond issued to finance a toll bridge includes a covenant requiring that toll revenues always exceed 1.25x annual debt service before new bonds can be issued. This is best described as:
A) A rate covenant B) An additional bonds test C) A maintenance covenant D) A gross revenue pledge
Answer: B — An additional bonds test specifies the minimum revenue coverage ratio the issuer must meet before issuing more bonds on parity. A rate covenant requires the issuer to set fees high enough to cover current debt service. A maintenance covenant requires upkeep of the project. A gross revenue pledge prioritizes debt service before operating expenses — not what is described here.
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Q5. Which of the following short-term municipal instruments is issued to finance construction costs while long-term permanent financing is being arranged?
A) Tax Anticipation Note (TAN) B) Revenue Anticipation Note (RAN) C) Bond Anticipation Note (BAN) D) Construction Loan Note (CLN)
Answer: D — CLNs are specifically issued to fund construction in advance of permanent financing. BANs (C) are issued while waiting to complete a permanent bond offering but are not specific to the construction phase. TANs (A) anticipate tax collections. RANs (B) anticipate revenue receipts. The distinction is that CLNs are tied to the construction activity itself.