casemark/analyzing-municipal-bonds

Analyzing Municipal Bonds

When To Use

• Evaluating creditworthiness of a general obligation (GO) or revenue bond issuer
• Comparing muni bond offerings across issuers, sectors, or maturities
• Assessing tax-equivalent yield advantage for a specific investor tax bracket
• Reviewing an existing muni position for credit deterioration or upgrade potential
• Analyzing a new issue's official statement (OS) for credit and structural risks

Inputs To Gather

• Bond identifiers: CUSIP, issuer name, series, maturity date, coupon, par amount
• Bond type: GO (limited or unlimited tax), revenue (specify pledged source — water/sewer, toll, hospital, airport, tax increment, etc.), conduit, or hybrid
• Official statement / offering document: Legal provisions, flow of funds, rate covenant, additional bonds test, debt service reserve fund details
• Financial statements: Issuer's CAFR or audited financials (2–3 most recent years)
• Rating agency reports: Moody's, S&P, Fitch — current ratings plus any outlook/watch actions
• Economic and demographic data: Population trends, employment base, median household income, top taxpayers/employers, assessed valuation history
• Investor profile (if computing tax-equivalent yield): Marginal federal rate, state rate, AMT status, state of residence vs. issuer state [VERIFY]

Workflow

1. Classify the bond structure

   • Determine GO vs. revenue; identify the specific pledged revenue stream or taxing authority
   • Note any credit enhancement: bond insurance (AGMC, Assured Guaranty, Build America Mutual), state credit enhancement programs, or letters of credit
   • Flag variable-rate demand obligations (VRDOs), tender option bonds, or other structures that introduce liquidity/remarketing risk

2. Analyze the revenue/tax base

   • GO bonds: Review assessed valuation trends, tax levy capacity, levy limits [VERIFY state-specific caps — e.g., Prop 13 in CA, PTELL in IL], collection rates, and top-10 taxpayer concentration
   • Revenue bonds: Evaluate the pledged revenue history (3–5 years), debt service coverage ratio (DSCR), rate covenant minimum (typically 1.10×–1.25× for utilities), additional bonds test, and flow-of-funds waterfall (gross vs. net pledge)
   • Identify single-source or concentration risk in the revenue stream

3. Assess issuer financial health

   • Review general fund balance as a percentage of expenditures (target: ≥15% unrestricted)
   • Check pension and OPEB funded ratios and annual required contributions as a share of the budget [VERIFY — GASB 67/68 and 74/75 reporting standards apply]
   • Evaluate debt burden: debt per capita, debt as % of assessed valuation, overlapping debt from other taxing jurisdictions
   • Note any history of draws on reserves, interfund borrowing, or budget deficits

4. Evaluate economic and demographic fundamentals

   • Population growth or decline trajectory
   • Employment diversity — flag dependence on a single employer or industry
   • Median household income relative to state and national benchmarks
   • Infrastructure condition and capital improvement plan adequacy

5. Compute tax-equivalent yield and relative value

   • Tax-equivalent yield = muni yield ÷ (1 − marginal tax rate); layer in state tax benefit if applicable [VERIFY — confirm whether the bond is subject to state tax in the investor's state; de minimis rules for secondary market discount bonds]
   • Compare spread to AAA MMD or Refinitiv muni benchmark curve at the relevant maturity point
   • Assess muni/Treasury ratio in context of historical range for the credit tier and maturity

6. Review legal and structural provisions

   • Call features: optional, mandatory sinking fund, extraordinary (e.g., catastrophe or eminent domain)
   • Bankruptcy eligibility: municipalities may file Chapter 9 in states that authorize it [VERIFY — only about half of US states authorize Chapter 9 filing]
   • Security pledge enforceability and any legislative risk to the pledged source

Output

Produce a Municipal Bond Credit Analysis containing:

• Summary: Issuer, bond type, par amount, coupon, maturity, rating(s), and one-paragraph credit opinion
• Revenue/Tax Base Assessment: Key metrics (DSCR, AV trends, collection rates) with 3-year trend table
• Financial Profile: Fund balance ratios, pension/OPEB exposure, debt burden metrics
• Economic Overview: Population, income, employment data with directional indicators
• Relative Value: Tax-equivalent yield, spread to benchmark, muni/Treasury ratio
• Risk Factors: Bullet list of material risks (concentration, pension burden, legal constraints, call risk)
• Recommendation: Buy / hold / sell or underweight / market-weight / overweight with rationale

Quality Checks

• All DSCR and coverage calculations tie back to audited revenue and debt service figures — no estimated numbers without [VERIFY] tag
• Tax-equivalent yield computation explicitly states the assumed tax rate(s) and whether AMT applies
• Pension and OPEB figures reference the most recent actuarial valuation date; flag if valuation is more than 2 years old
• Overlapping debt calculation includes all taxing jurisdictions (school districts, special districts, county)
• Rating agency actions within the last 12 months are captured; note any divergence between agencies
• State-specific legal provisions (tax caps, filing authorizations, appropriation risk for lease-backed debt) are marked [VERIFY] where jurisdictional variation exists