Analyze municipal bonds including tax-equivalent yield calculations, GO vs revenue bond evaluation, and muni credit analysis. Use when the user asks about municipal bonds, tax-exempt income, tax-equivalent yield, AMT bonds, callable bonds, yield-to-worst on munis, or muni credit quality. Also trigge

Fixed Income — Municipal Core Concepts General Obligation (GO) Bonds Backed by the full faith, credit, and taxing power of the issuing municipality. The issuer pledges to use any available revenue source (property tax, income tax, sales tax) to repay bondholders. GO bonds typically require voter approval and are considered safer due to the broad taxing pledge. Revenue Bonds Backed solely by the revenue generated from a specific project or source — toll roads (toll collections), water/sewer systems (utility fees), hospitals (patient revenue), airports (landing fees, terminal rents). Revenue bonds typically carry higher yields than GO bonds of comparable maturity and credit quality because of the narrower revenue pledge. Tax Equivalent Yield (TEY) The core calculation for comparing municipal bonds to taxable alternatives: Federal only: TEY = Muni Yield / (1 federal marginal rate) Federal + state (for in state munis): TEY = Muni Yield / (1 federal rate state rate × (1 federal rate)) This converts a tax exempt yield to the pre tax yield a taxable bond would need to offer to match the muni's after tax income. Note: the state rate × (1 federal rate) term assumes state income tax is fully deductible against federal tax. For taxpayers at or above the SALT deduction cap (or taking the standard deduction), state tax provides no incremental federal deduction, and the formula simplifies to TEY = Muni Yield / (1 federal rate state rate) — the combined formula above understates the in state muni's advantage for capped itemizers and overstates the precision of the comparison generally. Check the client's actual SALT position before choosing the formula. Alternative Minimum Tax (AMT) Certain private activity bonds generate interest that is subject to AMT. For taxpayers subject to AMT, the tax advantage of these bonds is reduced. AMT subject bonds typically trade at slightly higher yields to compensate. Non AMT munis (governmental purpose bonds) are not affected. Muni Credit Analysis GO bonds: evaluate tax base diversity and trends, debt burden ratios (debt per capita, debt/assessed value), fund balance as % of expenditures, economic base (population, employment), pension/OPEB obligations. Revenue bonds: evaluate debt service coverage ratio (DSCR = net revenue / annual debt service), rate covenants, additional bonds tests, demand analysis, and reserve fund adequacy. De Minimis Tax Rule Discount bonds purchased below a threshold (typically par minus 0.25% per year to maturity) may lose tax exempt status on the discount portion — the gain is taxed as ordinary income rather than being tax exempt. This affects the after tax return calculation for discount munis. Muni Yield Ratios Muni yield / Treasury yield. Historically this ratio averages approximately 80% for AAA munis. Ratios above 80 85% suggest munis are cheap relative to Treasuries; below 70% suggests they are rich. The ratio varies with supply/demand, tax policy expectations, and credit conditions. Build America Bonds (BABs) Taxable municipal bonds created under the 2009 stimulus. The federal government subsidizes 35% of interest cost. Expired for new issuance after 2010 but outstanding BABs continue to trade. They allowed issuers to access the broader taxable bond market. Pre Refunded/Escrowed Bonds When an issuer advance refunds a callable bond, it places US Treasuries in escrow sufficient to pay remaining coupons and the call price. These defeased bonds are effectively AAA quality and trade at very tight spreads. Key Formulas Formula Expression Use Case TEY (federal only) Muni Yield / (1 federal rate) Compare muni to taxable bond TEY (federal + state) Muni Yield / (1 fed rate state rate × (1 fed rate)) In state muni comparison DSCR Net Revenue / Annual Debt Service Revenue bond credit quality De Minimis Threshold Par 0.25% × years to maturity Tax treatment of discount munis Muni Yield Ratio Muni Yield / Treasury Yield Relative value assessment Worked Examples Example 1: Tax Equivalent Yield with Federal and State Tax Given: Muni yield = 3.5%, federal marginal rate = 37%, state marginal rate = 5% Calculate: Tax equivalent yield for an in state bond Solution: TEY = 3.5% / (1 0.37 0.05 × (1 0.37)) TEY = 3.5% / (1 0.37 0.05 × 0.63) TEY = 3.5% / (1 0.37 0.0315) TEY = 3.5% / 0.5985 TEY = 5.85% A taxable bond would need to yield 5.85% to match the after tax income of this 3.5% muni for this taxpayer. The state tax benefit adds approximately 29bp of value compared to the federal only TEY of 5.56%. Example 2: GO vs Revenue Bond Comparison Given: Same issuer, same maturity (10 years). GO bond yields 3.2%, revenue bond (water/sewer) yields 3.6%. DSCR on revenue bond = 1.8x. Calculate: Which bond offers better value? Solution: The revenue bond yields 40bp more than the GO bond. The DSCR of 1.8x is well above the typical 1.25x minimum for investment grade, indicating strong coverage. Water/sewer is an essential service with stable demand. The 40bp additional yield compensates for the narrower revenue pledge, but the strong coverage ratio suggests the credit risk is modest. For investors comfortable with revenue bond structures, the 40bp pickup may represent good relative value. Common Pitfalls Forgetting state tax benefits for in state bonds — the combined federal+state TEY can be meaningfully higher than federal only AMT implications for high income investors — private activity bond interest may trigger AMT liability De minimis rule on discount munis — gains on deep discount munis may be taxed as ordinary income Confusing call provisions — many munis are callable at par after 10 years; always check yield to worst Cross References time value of money (core plugin): present value and discounting fundamentals fixed income sovereign (wealth management plugin): yield curve context and duration concepts fixed income corporate (wealth management plugin): comparing muni spreads to corporate spreads tax efficiency (wealth management plugin): muni bonds as a primary tax management tool Running the Script The demo prints the calculations covered above; its values match the worked examples in this skill. Run help for a list of the classes and functions. For programmatic use, import the module rather than running it — the demo only executes under python fixed income municipal.py .

fixed-income-municipal