General Obligation vs Revenue Bonds

General obligation and revenue bonds represent the two fundamental structures in municipal finance, but the distinction matters far more than textbook definitions suggest. In Detroit's 2013 bankruptcy, ULTGO bondholders recovered roughly 75 cents on the dollar while water and sewer revenue bondholders continued receiving 100% of scheduled payments throughout the proceedings (Adelino and Ferreira, 2017). The durable lesson: pledge type shapes your negotiating position in distress, but credit fundamentals determine whether you ever face that negotiation.

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The Structural Divide (Why It Shapes Everything)

The GO vs. revenue split isn't about relative safety. It's about what backs your claim and who decides whether to pay you.

General Obligation Bonds:

• Backed by the issuer's "full faith, credit, and taxing power"
• Repayment comes from general fund revenues (property taxes, income taxes, sales taxes)
• Requires political will to raise taxes or cut services to prioritize bondholders
• Legal pledge is broad but enforcement is complicated

Revenue Bonds:

• Backed by specific project or enterprise revenues (tolls, utility fees, hospital charges)
• Repayment comes from a dedicated revenue stream pledged exclusively to bondholders
• Legal structure typically creates a separate trust with bondholder priority
• Enforcement is contractual and specific

The practical causal chain: Pledge type (legal structure) → Default negotiation leverage (your position) → Recovery rate (what you get)

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General Obligation Mechanics (The Taxing Power Question)

GO bonds sound safer because they're backed by an entire government's ability to tax. The reality is more nuanced.

Unlimited Tax GO (ULTGO) vs Limited Tax GO (LTGO)

ULTGO bonds:

• Issuer has unlimited authority to raise taxes to pay debt service
• Typically requires voter approval for issuance
• Represents strongest GO pledge available
• Still subject to political constraints on actually raising taxes

LTGO bonds:

• Issuer can only raise taxes within an existing cap or rate limit
• If capped taxes generate insufficient revenue, bondholders compete with other claims
• Common in states with constitutional tax limitations
• Legal pledge is weaker than ULTGO

The test: Before buying any GO bond, ask: Is this unlimited or limited tax? The answer changes your credit analysis entirely.

What "Full Faith and Credit" Actually Means

"Full faith and credit" is a legal pledge, not a guarantee. It means the issuer commits its general creditworthiness, but enforcement depends on:

1. State constitutional provisions (some states prioritize debt service; others don't)
2. Bankruptcy availability (23 states explicitly authorize municipal Chapter 9 filing)
3. Political willingness (raising taxes to pay bondholders is never popular)
4. Essential services pressure (police, fire, schools compete for same general fund)

The point is: GO pledge quality varies enormously by state and issuer. A Texas ULTGO isn't the same as a Pennsylvania LTGO.

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Revenue Bond Mechanics (The Essentiality Question)

Revenue bonds replace taxing power with dedicated cash flows. Your recovery depends on the revenue stream's stability and legal protections.

The Revenue Pledge Structure

A typical revenue bond includes:

1. Gross or net revenue pledge - Either total revenues or revenues after operating expenses
2. Rate covenant - Issuer agrees to maintain rates sufficient for debt service coverage
3. Additional bonds test - Limits on issuing pari passu debt
4. Reserve requirements - Typically 6-12 months of debt service in reserve
5. Flow of funds - Priority waterfall specifying payment order

Why structure matters: Gross revenue pledge → Bondholders paid before operating expenses → Stronger position Net revenue pledge → Operating expenses paid first → Bondholders second

Essential vs Non-Essential Revenue

Not all revenue bonds carry equal risk. The essentiality of the underlying service determines payment reliability:

Essential services (lowest risk):

• Water and sewer (people need water regardless of economy)
• Electric utilities (essential and typically monopoly)
• Public education (relatively stable enrollment)

Transportation (moderate risk):

• Toll roads (traffic volume fluctuates with economy)
• Airports (passenger volume cyclical)
• Mass transit (ridership volatile; often requires subsidies)

Non-essential services (higher risk):

• Convention centers
• Sports facilities
• Parking garages
• Industrial development

The durable lesson: Essential service revenues continued through Detroit's bankruptcy. Non-essential revenues often collapse precisely when general fund distress occurs.

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The Detroit Case Study (What It Actually Taught Us)

Detroit's 2013 bankruptcy reshaped market understanding of GO vs. revenue risk.

The Numbers

Detroit's approximately $6 billion in water and sewer revenue bonds (backed by specific revenue pledges) maintained full payment throughout bankruptcy. Meanwhile, GO bondholders faced significant haircuts.

Why This Happened

1. Political reality: Emergency Manager prioritized pensioners over bondholders
2. Essential services: Water/sewer continued operating; revenues kept flowing to bondholders
3. Legal structure: Revenue bond trusts were separate from general fund; harder to break
4. Negotiating leverage: Revenue bondholders had specific collateral; GO bondholders had only general claims

The practical point: Detroit proved that a strong legal pledge (revenue bond with essential service) can outperform a weak government's "full faith and credit."

Market Impact

After Detroit, spreads between GO and revenue bonds narrowed significantly. Markets repriced the assumption that GO automatically meant safer:

• Pre-Detroit: GO spreads typically 20-40 bps tighter than revenue bonds of similar rating
• Post-Detroit: Premium compressed to near zero for weak GO issuers
• Current market: Credit fundamentals matter more than pledge type

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Credit Analysis Framework (What to Actually Check)

For GO Bonds

Essential questions:

1. Is this ULTGO or LTGO? (Unlimited tax authority or capped?)
2. What's the debt burden? (Debt per capita, debt-to-personal-income ratio)
3. Is the tax base diversified? (Single employer dependence is dangerous)
4. What are pension and OPEB obligations? (Often larger than bonded debt)
5. What state legal protections exist? (Some states prioritize debt; others favor employees)

Red flags:

• Debt per capita exceeding $3,000
• Pension funding below 70%
• Operating deficits in 3+ consecutive years
• Heavy dependence on single revenue source or employer

For Revenue Bonds

Essential questions:

1. What's the debt service coverage ratio (DSCR)? (Target: 1.2x or higher)
2. Is the revenue pledge gross or net?
3. How essential is the service? (Water/sewer = high; convention center = low)
4. What's the rate-setting flexibility? (Can issuer raise prices to cover costs?)
5. What's the service area demographics? (Growing or declining population?)

Red flags:

• DSCR below 1.1x
• Net revenue pledge with high operating cost volatility
• Non-essential service with competitive alternatives
• Rate covenant violations in past 3 years
• Service area population declining more than 1% annually

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The Municipal-Treasury Ratio (Valuation Context)

When evaluating GO vs. revenue bonds, understand where munis trade relative to Treasuries:

Muni-Treasury ratios (AAA munis vs. comparable Treasury):

Interpretation:

• Below 80%: Munis relatively expensive (strong demand)
• 80-90%: Fair value zone
• Above 100%: Munis unusually cheap (strong buy signal)

Why this matters: When munis are expensive (low ratios), credit selection becomes more important. There's less margin for error.

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Common Investor Mistakes (And How to Avoid Them)

Mistake 1: Assuming GO Always Means Safer

Pre-Detroit thinking treated GO as automatically superior. The reality is more nuanced:

• A strong revenue bond (essential service, 1.5x DSCR, monopoly provider) often carries less risk than a weak GO (declining tax base, heavy pension burden, political dysfunction)
• The test: Would you rather have a dedicated claim on water revenues or a general claim on a struggling city's tax receipts?

Mistake 2: Ignoring State Legal Frameworks

Municipal bankruptcy (Chapter 9) availability varies by state:

• 23 states explicitly authorize Chapter 9 filing
• 12 states prohibit municipal bankruptcy entirely
• Others require state approval or have no clear law

In states without bankruptcy protection, bondholders may have stronger enforcement options. In states with easy Chapter 9 access, recovery uncertainty increases.

Mistake 3: Overlooking Pension Competition

GO bondholders compete with pensioners for the same general fund. In distress, pensioners consistently receive favorable treatment:

• Detroit: Pensioners recovered more than GO bondholders
• Stockton: Pensioners fully protected; bondholders took losses
• San Bernardino: Pension obligation bonds recovered 1%; pensioners preserved

The practical point: When analyzing GO credit, treat unfunded pension obligations as senior debt competing for the same resources.

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Portfolio Construction Implications

Diversification Strategy

For conservative municipal portfolios:

• Mix GO and revenue bonds for structural diversification
• Emphasize essential service revenue bonds in weaker credit environments
• Prefer ULTGO over LTGO for general obligation exposure

For yield-seeking portfolios:

• Revenue bonds from strong essential services may offer better risk-adjusted returns than weaker GO credits
• Look for essential service issuers with temporary credit pressure but stable long-term fundamentals

Ladder Considerations

When building a muni ladder:

1. Short-end (1-5 years): Credit quality matters less; favor liquidity
2. Intermediate (5-10 years): Balance credit and structure
3. Long-end (10+ years): Credit fundamentals dominate; favor essential service revenues or strong GO credits

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Mitigation Checklist

Essential (prevents 80% of errors)

These 4 items prevent most GO vs. revenue selection mistakes:

1. Identify pledge type: Is it ULTGO, LTGO, gross revenue, or net revenue?
2. Check DSCR for revenue bonds: Target 1.2x minimum; below 1.1x requires investigation
3. Research pension/OPEB for GO bonds: Unfunded liabilities compete for same funds
4. Verify essential service status: Water/sewer/electric preferred over non-essential

High-Impact (systematic approach)

For investors building systematic municipal exposure:

1. Check state legal framework: Know bankruptcy availability and debt priority provisions
2. Review EMMA filings: Look for disclosure consistency and timeliness
3. Compare muni-Treasury ratios: Understand relative valuation before buying

Optional (for dedicated muni investors)

If you're particularly focused on municipal bonds:

1. Track credit migration (upgrades/downgrades) in your holdings
2. Monitor local economic indicators for GO issuers (employment, population, tax base)
3. Subscribe to rating agency alerts for holdings

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Key Takeaways

1. Pledge type shapes recovery leverage, but credit fundamentals determine whether you face recovery scenarios
2. Essential service revenues (water, sewer, electric) proved more reliable than weak GO pledges in Detroit
3. ULTGO vs. LTGO distinction matters enormously; they're not the same credit
4. Pension competition is the hidden risk for GO bondholders; unfunded obligations are de facto senior claims
5. Post-Detroit pricing removed the automatic GO premium; credit analysis matters more than structure

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Related Concepts

• Essential Service Revenue Streams - Deep dive into water, sewer, and utility revenue analysis
• Credit Analysis for State vs. Local Issuers - Framework for assessing GO credit quality
• Default Case Studies in the Municipal Market - Detroit, Puerto Rico, and other lessons

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References

1. Adelino, M., Cunha, I., & Ferreira, M. A. (2017). The Economic Effects of Public Financing: Evidence from Municipal Bond Ratings Recalibration. Review of Financial Studies, 30(9), 3223-3268.
2. Ang, A., Bhansali, V., & Xing, Y. (2014). The Muni Bond Spread: Credit, Liquidity, and Tax. Columbia Business School Research Paper No. 14-37.
3. Moody's Investors Service. (2014). Special Comment: Detroit Bankruptcy and Its Implications for Municipal Markets.
4. SIFMA. (2024). US Municipal Bonds Statistics. Retrieved from https://www.sifma.org/research/statistics/us-municipal-bonds-statistics
5. MSRB. (2024). Electronic Municipal Market Access (EMMA). Retrieved from https://emma.msrb.org/